DIY CO2 Extraction?

I don’t know about ya’ll, but I have been watching CO2 Super Critical Fluid (SFE) with interest and have wanted to sample some cannabis essential oils extracted by that method, but the cost of conventional SFE equipment, is outside the range of most of our finances.

For the rest of ya’ll just learning of the process, let’s quickly examine what SFE is, by looking at what Wikipedia has to say about it, followed by our kicking off our affordable DIY CO2 extractor design project:

Supercritical carbon dioxide

From Wikipedia, the free encyclopedia

Carbon dioxide pressure-temperature phase diagram

Supercritical carbon dioxide is a fluid state of carbon dioxide where it is held at or above its critical temperature and critical pressure.

Carbon dioxide usually behaves as a gas in air at standard temperature and pressure (STP), or as a solid called dry ice when frozen. If the temperature and pressure are both increased from STP to be at or above the critical point for carbon dioxide, it can adopt properties midway between a gas and a liquid. More specifically, it behaves as a supercritical fluid above its critical temperature (31.1 °C) and critical pressure (72.9 atm/7.39 MPa), expanding to fill its container like a gas but with a density like that of a liquid.

Supercritical CO2 is becoming an important commercial and industrial solvent due to its role in chemical extraction in addition to its low toxicity and environmental impact. The relatively low temperature of the process and the stability of CO2 also allows most compounds to be extracted with little damage or denaturing. In addition, the solubility of many extracted compounds in CO2 vary with pressure,[1]permitting selective extractions.

Soooo, in us’n layman’s terms,  we use plain old CO2, that we have gotten hotter than 31.1C/87.98F, while under at least 1086 pounds per square inch pressure.

In that state, the CO2 becomes a super solvent, which has higher penetration power, and can be fine tuned to focus in on specific constitutes, by varying the pressure, temperature, and by the use of co-solvents like ethanol or hexane.

Fair enough, and easy enough to accomplish several ways!  Traditionally a high pressure intensifier pump is used to achieve the required pressures.

Cryo-pumping also works.  You start with liquid CO2 or dry ice and heat it in an enclosed space.

My first conceptual of a system that was semi affordable, was a simple minded system using liquid CO2 and heat to run it at about 1500 PSI.  That eliminated the pumps normally used and by using a liquid Dewar with a dip tube, with both a gas head and a liquid tap, the need for any liquid pumps is eliminated as well.

It is designed to use readily available Schedule 180 austenitic stainless pipe and its largest component is small enough to fit in my 7″ X 36″ lathe.  My original plan was to use an existing hydraulic cylinder for my vessel, but alas, carbon steel embrittles excessively at cryogenic temperatures.

My design calls for achieving pressure by simply heating the pipe with available pipe band heaters.

Pressure was controlled using a conventional, though expensive back pressure regulator.  Please note the attached conceptual, which reflects my thinking four to five years ago.  I put the project on the back burner after reading the SFE CO2 patents for extracting cannabis, and noting that CO2 isn’t a very aggressive solvent and the patented processes used significant fluid exchange rates, as well as relatively long spans of time.

To compound that, reports from those testing SFE CO2 extractions reported poor taste and effects, so I put CO2 extraction on the back burner to just watch for awhile.

Within the last couple of years several folks have done some interesting work starting with dry ice.  The first that I noted was able to maintain high enough pressure in a test tube to keep dry ice from sublimating as it warmed, so as to extract some Limonene from an orange peel.

That led me to question whether super critical pressures were required to extract the essential oils from cannabis that we typically extract with other solvents, and further experiments by others suggests that it is not.  Some even report better results at subcritical pressures, especially with the use of co-solvents.

Sub critical extraction presents an interesting twist from a simplicity standpoint, so of course my simple mind immediately envisioned replacing the test tube with a pressure vessel containing dry ice in the bottom, and a basket of material suspended above it.  Screw down lid and bring it up to temperature with a pipe clamp heater for pressure.

Flooding is achieved by simply turning it upside down to soak the material and right side up to drain.  That step could be repeated back and forth, to soak the material and keep the boundary layers diminished.  On setting it upright the final time, we could bleed off the liquid into an expansion chamber and then to atmosphere, leaving behind the oil.

I have decided to build a 2″ X 24″ prototype, and have acquired two resources on this project that emboldens me.  One is the offer from a dear old friend, to allow me the use of his aerospace pressure and vacuum equipment manufacturing facilities for giggles and old times sake.

The other is an agreement with another old friend, who owns a cryogenic equipment manufacturing plant back east and is familiar with SFE.

We have a mutual engineering support agreement in effect, in exchange for my support on one of their projects with a former aerospace customer of mine, who is now their customer as well.

For my support interfacing their equipment with equipment of my own design and manufacture before retirement, they will support me in developing a simple minded DIY SFE system, that hopefully more of us’ns can afford to build, or have built.

So here is my first simple minded conceptual using liquid:

Here is my simple minded conceptual starting with dry ice:
OOPs, solly, watch this space!

After working all day on the drawing, my 2002 32 bit Auto Cad program is not able to access my printer on my 64 bit processor, and I’m not smart enough to figure it out, so I have to find a computer hero or heroine first.

The way my conceptual works, is the bottom of the cylinder is filled with dry ice , on top of which sits a wire basket of plant material.  Clamp on band heaters turn the dry ice to liquid, which is circulated and soaked through the material by simply turning the cylinder upside down.

After flipping it about a few times, over an extended soak, the vessel is set upright and attached to the lower expansion chamber via a hydraulic quick disconnect.  The liquid is bled off, decompressed, and the oil collected from the decompression vessel via the bottom drain valve, as well as via the detachable bottom.

Lu lu lu lu lu lu lu lu lu lu lu lu lu lu lu!!!!!!!!!!!!!!!!!!!!!!!!  Progress!

Well thank the Great Spirit for ex-brother in laws, who can sort out computer problems, so that I can print from virtual mode.  Hee, hee, hee, kept him at tossed the sister……….

Here is my simple minded conceptual of how such a dry ice system might work.  More detail prints once I have exercised some resources.

After further discussion with another experimenter, I have decided to build the system to operate at 5000 psi and below.  Instead of using schedule 160 stainless pipe, I will gun grill a billet of stainless, but will keep the bore at one inch.

Hi ya’ll!

Been out talking to folks running commercial CO2 SFE units and would like to share some selected excerpts from their letters, to keep their identities confidential:

Hi Graywolf, here is some pics of the unit i have been running for 8+ years. Our whole thing with this unit was to have maximum fractionation capabilities. 

The extraction vessel is rated to 10,000psi,  and made of stainless!! 

We use a basket to hold the material and I’m having a natural cloth bag made that will go into the vessel and hopefully allow me to extract 2x current volume. 

There are some great graphs around the net that show the combinations of pressure and temps and the resulting density of co2. In general high pressure (we go up to 10,000psi) works well in combination with high temps (around 100c) and lower pressure around 5000 psi goes well with about 60c. 

I tried high pressure and while i need to try again to confirm, there seemed to be some degradation to the overall quality and definitely the fragrance. the yield was higher and its much more efficient requiring less co2. 

I already noticed on the bit of extract that i dissolved in ethanol and then winterized and filtered, the flavor is no where near what it was before going in the ethanol. I plan to try and get the waxes out with only co2. 

I cant see any advantage to using either hexane or ethanol or a mixture as a co solvent?? the compounds are easily soluble in co2 and usually those types of things will help to extract more polar compounds such as chlorophyll. It all depends on what your goals are? maybe he is using that mixture to help fractionate out the waxes?? 

I can do a small run next week using those co- solvents and report back if i see anything magic or some beautiful separation. maybe he is just some chemical engineer using a method that was used for another project and he is trying to apply it there? 

It seems really counterproductive to use co solvents and contaminate a great extract… maybe he can only do really low pressure and he requires the co solvent to help the efficiency?? 

I found material with a moisture content of around 10% to be fine. I don’t know what the implications of a slight amount of carbonic acid could mean? 

I have heard it can make oils rancid, but have run vegetable oils at 10+% moisture and had them test very low in peroxide values in respect to oxidation and rancidity. I do not see any problems with around 10% moisture, the water sometimes comes out with the extract and is sitting on top and the few mls there can be poured off.

And from yet another hero!

I. Extraction was performed by sub and supercritical CO2: 

        Subcritical (liquid): 10-12 ºC @ 65-70 bar for approximately 6 hrs. 

        Supercritical (liqid/gas): 40-45 ºC @ 230 bar for approximately 4 hrs. 

II. Separation of fats and sugars, by winterization, chromatography and high speed centrifugation. 

This part was very critical in the purification schema and required analysis of both the anaylate and precipitate. 

III. Purification, at this point one has two options, Flash Chromatography or Wiped Film Evaporation (Short-path) 

I performed both and in both techniques, one can obtain purities in the range of   95-99% total THC (∆9, ∆8 and ∆6) with the purity of  ∆9 ranging anywhere from  78-98% depending on the parameters set. 

One last comment, probably the most important….. absolutely no petroleum derived hydrocarbon solvent was used. Except for the small amounts used for LC/MS analysis.  This was my driving force to see if it could actually be pulled off.


We are moving this project from research to active experimentation in our FY 2013, now that the shack and Terpenators projects are a fait accompli.  What I did in FY 2012, was simply research and develop resources.

It was good that I did, as further research put things in better perspective.

While I determined that my simple minded CO2 SCFE system would work, it raises a the bigger germane question of why is this trip necessary, given how effective BHO and some of the other extraction methods are.  Why spend the money for this more expensive fish trap, if we already have the fish?

The answer lies in that what CO2 SFE extraction shines at, is selective extraction.  By fine tuning the pressure and temperature, as well as using co-solvents, specific components may be extracted, while leaving behind everything else.

That is of less value when discussing cannabis essential oil extraction, in that it has been determined that it is the entourage effects of all the terpenes present, including the diterpene cannabinoids, that are responsible for its medicinal properties.  That however doesn’t mean that we can’t specifically focus on that list of terpenes.

The other thing that my research made clear, and  that is using one vessel to process the material and raise the pressure in, would result in extractions along the entire temperature/pressure curve.  Woops, no selectivity there, but easily solved by bringing the liquid CO2 or dry ice up to a higher temperature and pressure in a separate vessel, and then equalizing it with the one containing the plant material!  Easy, but the system complexity grows.

One of the interesting things that my research turned up during tete a tetes with brothers owning and operating commercial CO2 SCFE’s, and bumblers like myself whomping up DYI ghetto extraction equipment, is the wide range of processes that different operators have achieved a modicum of success at.

One operator simply took the valve out of a CO2 bottle and filled it with plant material and dry ice, before replacing the valve and heating the tank to SCFE ranges.  He then inverted the tank and vented the CO2 into a catch container, where it left cannabis essential oils behind.

He claimed his best success using co-solvents at ~5500 psi and that his product was superior to all competing, but alas, I was never able to sample it and his spamming got him banned from the forums where we shared information.

Commercial SCFE operators report successful sub critical products as low as 350psi, and another at 850psi, but I haven’t been able to sample their successes, to confirm my own opinion of product quality.  There in lies the rub of course, as there is no common measurement and each creator loves his creation.

Fortune has ostensibly smiled on us however, in that two of the operators that I have been conversing with, have agreed to work more closely with us and to supply confirmation samples.  Hee, hee, hee……………………………

Even simpler DIY SCFE C02 6-2-13

Hee, hee, hee, you have to admire simplicity.  Here is the system by jyndustriez which I mentioned, that simply puts the plant material in an off the shelf CO2 tank, and floods it with liquid C02 from a second off the shelf tank, before heating to achieve super critical state.

More information on how he accomplishes that at, but here are some pictures he has shared:

DIY SCFE C02 extraction-1-2DIY SCFE extraction-1-1DIY SCFE CO2 extraction-1-3


Progress!  We got to play with a donated SCFE CO2 extraction sample and were able to heat it under vacuum and observe the effects.

As received, the sample was in a “wax” hydrate form, and was not aromatic.  The flavor was mild, and the effects were good.

As it was a small sample, I was unable to winterize it to remove the waxes, but I was able to heat it to 115F, under vacuum, and observe what happened.

The sample out gassed significant CO2, even though at 115F decarboxylation was minimal, and never quite turned clear, due to the high wax content, but that isn’t unique, as BHO extracts are improved by wax removal as well.

On the surface however, the wax content seemed high, compared to our typical BHO extraction, so I look forward to a large enough sample to winterize and determine just how much.

Here is a starting and ending photo, demonstrating the ending wax content.

C02 sample-1-1C02 sample-1-2

To add to our excitement, last week we got a guided tour of Eden Labs during our recent business trip to Seattle!  What fun!!!

Patrick, one of Eden Lab’s bright new sales consultants, attended one of our BHO classes and subsequently invited us for a tour, so how could we resist, hee, hee, hee, snicker, snark, snort………………?

Always a pleasure to see how the pros from Dover do things, and I do likes the way they detail a package.

We lucked out in finding the original creator available and got our guided tour from Fritz himself.  Besides his latest creation, we got to see not only his original test sled, but some of the R&D that may make great strides someday, when Fritz can find enough time to finish them, between current product demands……….

Their latest all stainless creation was in final assembly and testing, and was capable of extracting not only with subcritical and Super critical C02, but also with refrigerants like butane and propane.

It was appointed well, and used pneumatic intensifiers both for the hydrocarbon pump, as well as the SCFE CO2 pump.

It also sported a unique closure system, which simply spins close and that greatly simplifies loading, as compared to a 12 bolt flange with a torque wrench.

The vessel itself uses a Schedule 160 stainless core, but adds water jackets, so as to permit the use of a commercial heater/chiller for temperature control.

The unit that we looked at, had a $60K base price, plus the price of the hydrocarbon extraction capabilities.  Not cheap, and more complicated that most folks should attempt at home, but if you need a machine capable of a quality extract, in commercial quantities, you will need to step up to a system of this caliber, which includes pumps to cycle the C02, and C02 recycle to recover it afterwards.

Fritz did note that one of the things on his list of thangs he is juggling, is a smaller lab sized unit, which fills the market window for a smaller unit that doesn’t recycle.  Looking forward to see what comes up there!

From a process perspective, Fritz shared that the aromatic extractions are best done at low pressures and as the pressure goes up, so does the rate of chlorophyll extraction.  Based on his and other input, I will focus on the range from 800 psi to 3500 psi.  While I’ve heard operating parameters up to 9500 psi, the lower ranges sound more believable.

As unbelievable as it may sound, ah think sometimes operators shuck me, cause they are trying to protect process secrets and lead me astray.


Lu lu lu lu lu lu lu lu lu lu lu lu lu lu lu!!!!!!!!!!!!!!!!!!!!!!!1  The Great Spirit smiled and JYNdustriez loaned us a CO2 extraction setup and will show us how to use it, when he visits to watch Dr. Fischedick’s lecture on 11-2.

I’ve also located a local brother with an Eden Lab machine, who is amenable to experimentation, so things are heating up in the area of CO2 extraction at Skunk Pharm Research.  We will have machines from both ends of the price scale to experiment with.

Sound CO2 has also extended us an invitation to visit, and they run Apeks equipment, soooo even though our CO2 project was slow getting in motion this year, it looks like it is finishing with a bang.


Hee, hee, hee, check out JYN’s latest link on DIY SCFE CO2

245 responses to this post.

  1. […] Found a great article that will give you some info about CO2 extraction:…o2-extraction/ Cheers, Mo Mohican's 2014 Season and Seed Pictures Thread Reply With […]

  2. It’s amazing to visit this web page and reading the views of all mates on the topic of this paragraph, while I am also keen of getting knowledge.

  3. Posted by mike on January 14, 2014 at 9:27 PM

    Jyndustries regaurding your comment as being a at home extractor for personal use only running a oz a week i would most deff pay 2grand for a co2 setup thats just my opinion though i think others would feel the same as long as price is right around that mark

  4. Posted by Lonz on January 12, 2014 at 7:09 PM

    I should’ve stayed in school

  5. Posted by Chase on January 1, 2014 at 9:57 PM

    One thing I can’t stand in this game are so called ” tricks of the trade” or protecting process secrets as you say..

    We are suppose to be pioneers in the medical field! Not stingy cold shoulders hiding a secret family recipe! Haha

    • Wait till you spend countless hours and invest hundreds/thousands of dollars, trying to fine tune your creation. Then I want you to go and give it to the first Joe blow that wants to know how to build one. My opinion, if you don’t know how to do it, or don’t know how to figure it out, don’t do it! It is dangerous and technical to do, please don’t think this is something anyone can do, it takes understanding of physics and chemistry in order to achieve. So spare me the analogy of a secret recipe, if you can’t do the research to find what the proper specification are, then you don’t deserve to have the specs. On the other hand, I am perfectly willing to collaborate, and work with other designers in order to add mutually to each others designs.

      • Posted by Chase on February 26, 2014 at 8:48 AM

        Like anything, not everyone is cut out for it. But this is a medication we are talking about, so the more information the better. I don’t care about your design, I have my own. I have put in my countless thousands/hours. So please get over yourself.

  6. Posted by PlanetGreentoe Genetics on January 1, 2014 at 7:42 PM

    Great info, always enjoy your research to expand the mind of others

  7. Posted by dj on January 1, 2014 at 11:32 AM

    GW, do you have any workshops scheduled for early 2014? thank you all for all the great information on this forum. This is an Exceptional resource. Forward, and happy new year

  8. So, I wanted to ask those that read this thread what the most commonly needed semi-commercial to commercial system size would be. As in what weight of plant material processed per day in a reclaiming extractor?

    Also, for smaller personal or community use, what size would be desired?

    • A good question bro and one I will let the readers reply to:

    • Posted by Kraze on December 21, 2013 at 11:21 AM

      Commercial: 1/4 lb. to multiple pounds
      Personal: 1/4 oz. to 1/4 lb. Anything less wouldn’t yield desirable results.

      • Thanks for the response. 1/4lb is a sensible size. The issue with small scale is that there is a certain input cost with CO2 regardless of how small your pressure vessel is. I do not know that people would want to pay $2000 for a 7 gram system.

        In the long run, the vessels will have to be stainless to avoid corrosion and to provide a system can be used for all sorts of flavorings and aromas even if they are acidic. As well as moist plant material for those in a rush.

        Another dilemma with personal size extractors is that the individual will want it to work similarly to a commercial one, only on a smaller scale. Well that would require a pump, adding several thousand minimum to the machine.

        For small personal use, I think a reality is reclaiming is a second string goal because this necessitates either extremes of chilling and heating, or a mechanical pump.

        In my opinion the cost of CO2 is not great enough to be concerned when extracting 1/4lb and below. This can be done with less than 50lbs of CO2.

        There are three concerns with releasing carbon dioxide, cost, pollution, asphyxiation. The cost is not very great, I can purchase liquid carbon dioxide at $1 per lb.

        Pollution is a legitimate concern. However, the liquid carbon dioxide was almost certainly collected from a CO2 emission of some sort that would have ended up in the atmosphere. These include industrial emissions that are warm when exiting piping and more easily ejected into drafts that carry the gas into the atmosphere. CO2 is heavier than air but not so much that a small amount of energy from heat, or wind, can’t carry it up higher. It is also water soluble, and there is plenty of moisture in the atmosphere. Releasing it from the ground level perhaps gives it a better chance to be absorbed by vegetation, dissolved in ground water and form limestone, etc.

        Asphyxiation, is also a concern. You would need a little less than 8lbs to be released in a closed 10x10x8 room to pass out in one minute. So, like butane, this should always be done in a well ventilated area. Fire hazard is not a concern with CO2 however. Feel free to conduct safety meetings nearby.

        Commercial use has lots of applications that make financial sense. I think it makes monetary sense around 5lb capacity and up if running the same form of plant material. In a more diverse setting with lots of different herbs and essential oils being run a smaller 1lb may be more sensible so several small batches could be extracted.

    • Posted by PlanetGreentoe Genetics on January 1, 2014 at 7:48 PM

      We are looking for semi commercial units that can do 1/2 lb – 5 lb
      Thank you

  9. Posted by daniel on December 5, 2013 at 5:23 PM

    very well written page. lots of info. personally I use a keifing method. usually dry ice or silk screen. I then take just keif and run butane. trying to keep it about 115 I keep it under -25 psig for at least 24 hours. I end with a product that looks like keif but melts like a wax. usually dry crumbly and yellow. I am an electrician also into air conditioning working on a degree in engineering. I do this method for my elderly communities ailments. I make no profit. they bring me product , butane and dinner. I just do the work. I am interested in a more efficient and safer way of doing this. now I have been researching co2 for a while and it seems very interesting. I have yet to send it in to be tested but tastes, smells, looks, and works good. any new info would help.

    • We have a growing interest in CO2 as well and have been playing with JYNdustrez loaner DIY running tests, and are excited to announce that Apek’s has offered us the loan of a 1 liter bench top SCFE unit for experimentation after the first of the year. We will provide more feedback when we have more to report.

      Thus far it appears that a dual extraction might be in order, recombining the fractions afterwards. First a sub-critical extraction to harvest the lighter terpenes, followed by a higher pressure extraction for the diterpenes.

      As the pressure goes up, so does the dissolution rate, which means a faster and more complete harvest of the diterpene cannabinoids, but alas it also dissolves more plant waxes and chlorophyll, besides changing some of the terpenes.

      One solution, seems to be using lower pressure and a higher CO2 exchange rate, which we can’t do with our current pump-less scuba tank system, so more on that after we check it out with the new system.

      At any rate, 2014 promises to be a more enlightening year for SCFE CO2 extraction, so stay tuned.

  10. Posted by Paul on December 5, 2013 at 3:08 PM

    I have a question regarding CO2 extraction would it be possible to reverse the concept of a pressure cooker instead use it as a pressure cooler to effect extraction of essential oils assuming I would able to relief the pressure as the CO2 warms up slowly to room temp thanks for your comments

    • Most pressure cookers are rated at 15 psi, and we did our last extraction from 800, to 4,200 psi, so something heavier duty is required.

      • Posted by Paull on December 9, 2013 at 11:34 AM

        Thanks for you response I am trying to find a better way to extract the oils and flavors out of fuits and berries other than useing hot solvents because the heat voltillizes the ketones aldehydes and esters which contain most of the flavors I tought that CO extraction might be a way to do this
        to seperate the oils from the biomass

    • You beat me to it GW, I was going to say you will have very little liquid CO2 in the pressure cooker and would be lucky to pick up some terpenes.

      However, It is a good idea to control the release of CO2. Basically I am doing the same thing with a small pressure vessel between 100-200PSI to capture the dissolved oils after they are extracted at high pressure in a SCUBA tank. In that I use a compressor relief valve to allow the gas to escape and the collection vessel does not over pressurize. Also between that range there is a change for liquid CO2 to exist so instead of only dry ice sputtering out of the needle valve some liquid passes through as well making for a smoother collection and less clogging.

      Besides the aromatic compounds, essential oils and waxes are not very soluble in CO2 until you get above 2500PSI meaning the CO2 has to be heated initially or forced into a very small volume. Terpenes are soluble in liquid CO2 at almost any pressure but massive compounds(heavier oils) require a denser solvent, and you are certainly after the more massive oils as well.

      Of course this is all moot if you have a pump to run liquid or supercritical CO2 all day long. Then the solubility level matters a little less.

  11. I rarely drop comments, however i did some searching and wound up here DIY CO2 Extraction?

    | Skunk Pharm Research LLC. And I do have a couple of questions for you if you usually
    do not mind. Is it just me or does it look like some of the comments look
    like left by brain dead people? :-P And, if you are writing at other social sites, I would like to follow
    everything new you have to post. Would you make a list of every one of your community sites like your linkedin profile, Facebook page or twitter feed?

    • There are three of us here, but Moi (Graywolf) does most of the on line researching and posting on other forums. Because of time constraints, I have reduced the number of sites that I frequent, and try to spend them on the sites that share the most interest in extraction and processing.

      Alphabetically, some that I visit regularly as Graywolf or Fadedawg are:

      CannaCabana (private)
      Green Passion
      Rollitup (as Fadedawg)
      THC Farmer
      Toke City
      Treating Yourself

  12. Posted by Woodmizer on November 13, 2013 at 10:19 PM

    If wax is what your trying to make stick to BHO. It’s hard to achieve with CO2. Less bad more good;-). Wax is lipids left over from extraction processes that leave this behind. If you want the good stuff keep reading what these boys at SKF have to say. You will have a hard time getting a Wax out of CO2 extracted medicine because of the solvent used to do the above mentioned, but more power. Keep condensing, and try, try, and try until you succeed..

    • Posted by nick p on December 13, 2013 at 9:18 PM

      i was told that you start to extract the wax at around 4000 psi

    • Posted by Isaac on December 22, 2013 at 3:32 PM

      Where can I follow them I am trying to do more research on wax butane method semi-commercial. If you post the links it would be greatly appreciated. Before I do my first batch I want to know as much as I can if you have anything to comment on about the method you recommend me using please feel free to email

    • The wax consistency is harder to achieve with CO2 partly because the solvent has a very low surface tension and does not exist as a liquid at STP. Butane allows a convenient self whip to happen under vacuum.

      You definitely will start extracting more waxes above 4000PSI which will help with achieving a thicker extract. I guess I just cant get on the bandwagon to add unnecessary waxes, but to each his own.

      Despite the issues, I consistently achieve firm to glass-like extracts with CO2. Previously I had issues with residual water because of needing alcohol to get the oil from the collection container. Now I use a better shaped collection container that allows scraping.

      What I do is place the oil under vacuum while it is still inside of the collection container, this gets rid of the carbonation in the oils and I vacuum until the oils begin to “snap” easily. I use a quick connect adapted to my vacuum pump (cheap rocking piston type).

      I will post a YT video in a week or so.

  13. Posted by Nicola on November 1, 2013 at 1:55 PM

    I’m looking to purchase a CO2 extractor from Eden Labs. There seems to be a huge divide in people’s likes and dislikes for CO2 wax. If any one has experiences with this machine and making exeptional CO2 wax I need a lesson! I am willing to travel to learn please email me if you can help me!

  14. Posted by Dave on October 16, 2013 at 7:31 AM

    What pressures and temps are these guys running to make there oil? My machine here is Cali is running perfect and making a very pure and great tasting oil. I am sending it in this week for a terpene profile to how it compares to bho. I have found that my customers stop smoking wax after trying my product because the high is clearer and more potent then there current wax. I complete an extraction at 10am and all oil is gone by noon. I think they need to try some adjustments and possibly build a carbon filter to catch the terpenes that don’t drop out in the collection chamber then heat and met the oil back into the collection jar. The c02 oil is there you just need to know how to operate it.

  15. Posted by on October 6, 2013 at 12:43 AM

    If you are looking for co2 mmj oil the best of the best email me

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  17. Very nice blog…i am going up next week to Seattle to look at one of the machines, the trouble is i cant find any one willing to talk to me that has one? Or get any of the oil they make?

    • In Seattle, I would suggest talking to Fritz at Eden Labs. There is also an operating Apeks unit on Bainbridge Island, but I will have to ask the owners how enthusiastic they are to give tours and advice.


      • I have talked to a couple of people that have the machine and NONE are willing to let me come have a look or willing to even talk about it? And these where names i got from the company as a reference? I can find very little about any of this on line? The things that come to my mind is? If this has been around from 1997 WHY cant i find out any info about any of it? Does it really work? Is it worth the $70k investment? The thought of having a machine that you can control quality, consistency, and press a button and come back in 4 hours and its done? Just seems to be a no brainier? Why is no one doing it?

        • CO2 works, but as you noted is expensive to purchase. It is also slow to operate, so not many of them out there competing with some of the faster cheaper methods.

          The process has great potential, but needs to be worked out for cannanbis and those who have invested the time and money to develop a process, have mostly done it with the hopes of getting a return, so that may explain their reluctance.

          I think you will see more of them and eventually some competition at some of the Cup’s.

          • Posted by tom on October 6, 2013 at 9:45 AM

            After weeks and weeks of looking and not being able to find any info, not even very much talk on any forums about this? I found a machine and guy making the oil in Oregon. I see why its not around and no one is talking about it. The oil gets you good and high but taste like crap..It taste like a leafy joint. Thinking it was how the guy made it or the material used i took over some good bud to run in it. Same results.

          • I’ve yet to sample a CO2 extraction that was equal to a well made BHO yet either, and they didn’t do well at the Seattle Cup, but I see them making progress developing the process and it has great potential.

          • I am sincerely surprised that this is the experience that the two of you have had. While I have never tried an extract from a fancy machine, I hands down prefer the flavor and aroma of CO2 extracts. Anything I extract, rosemary, oranges, cayenne, etc come out nauseatingly aromatic.

            I’m rushing to get a system to you GW for some confirmation. Like always I am waiting on parts and every time I get them I have to use them on a customers system. But I promise you will have one to try out soon.

            Also, thank you for the open forum you provide for this topic.

          • Sincerely looking forward to trying out the loaned equipment, as I agree that the orange oil that you supplied was first class. A cannabis extract of that quality would be competitive with BHO and I predict would fare well in a public shoot off.

            The unanswered question, is how exactly to get that level of quality on cannabis, and while I have no doubt CO2 will arrive there, it hasn’t done so locally so that I can personally test it.

            I understand how confining experimentation is at your location, but with your background in extracting other oils, you might consider a vacation to this neck of the woods once I’ve confirmed receipt of the equipment and set it up, to help develop the CO2 cannabis extraction process fine points.

            If it was compatible with your schedule, you might consider scheduling it so as to catch Dr Fischedick’s lecture on Cannabis terpene profiles and properties. Some of the folks attending, are most likely folks you will want for resources, and of course I would look forward to what you might share and will provide with a complimentary ticket.

          • Ok, you got me with free learning. I am buying a ticket to put me in OR on the 1st of November and leaving the 3rd. Please write me in for the lecture.

            I will be sure to send the home system ahead of me so that I can be with it to show how I use it.

            Thank you very much for the invite.

          • OK, got you written in and will see you at the airport.

        • I have found that with understanding the right concepts CO2 is easy to work with.

          I have extracted more times than I can count now, only ever with my own machines. I am almost done with a 10L stainless steel system that will take around 12hrs to completely extract. It is not as automated as one button, but close, and I have done it many times cheaper than what is available.

          A press and go extractor can be built easily, but the budget must be there. The high pressure solenoids alone will cost a pretty penny. In fact it was the solenoids that put me out of budget, not by much, but I couldn’t risk it. Also, if you want short extraction times you either need large masses of low pressure CO2 to flow through the plant material (expensive pumps and cooling systems), or very high pressure and high temperature chambers (exotic metals). So it can be done cheaper than what is out there now, but not cheap.

          My two cents is that these extractors should be designed and built from efficiency and safety perspectives, not a laboratory perspective. Not to mention all of the current commercial models look pretty similar.

          You are right GW pretty much everyone wants a return, myself included. With the amount of my life that this consumes I do not feel guilty about it at all. I do not keep anything I do a secret once I am done and can feel confident sharing. However, I am always sketchy about sharing ideas when they are not finished machines in front of me, one, people could get hurt, two, people steal.

        • I have found that with understanding the right concepts CO2 is easy to work with.

          I have extracted more times than I can count now, only ever with my own machines. I am almost done with a 10L stainless steel system that will take around 12hrs to completely extract. It is not as automated as one button, but close, and I have done it many times cheaper than what is available.

          A press and go extractor can be built easily, but the budget must be there. The high pressure solenoids alone will cost a pretty penny. In fact it was the solenoids that put me out of budget for complete automation, not by much, but I couldn’t risk it. Also, if you want short extraction times you either need large masses of low pressure CO2 to flow through the plant material (expensive pumps and cooling systems), or very high pressure and high temperature chambers (exotic metals). So it can be done cheaper than what is out there now, but not cheap.

          My two cents is that these extractors should be designed and built from efficiency and safety perspectives, not a laboratory perspective. Not to mention all of the current commercial models look pretty similar.

          You are right GW pretty much everyone wants a return, myself included. With the amount of my life that this consumes I do not feel guilty about it at all. I do not keep anything I do a secret once I am done and can feel confident sharing. However, I am always sketchy about sharing ideas when they are not finished machines in front of me, one, people could get hurt, two, people steal.

          • Posted by tom on October 14, 2013 at 9:38 AM

            I have purchased oil from Calif., Wash. & Oregon and not one was good oil in my mind. High not as strong, all the oil taste like leafy joints way to much chlorophyll taste? I meet a guy in Oregon that has a machine and he has jars and jars of oil he cant get rid of, no one wants it! I thought it might be the material he was using so i gave him 2 p of nothing but good bud and it turned out like crap. I think this CO2 oil thing is like lots of things in this new pot thing. No one wants to admit they payed $60 to $80 for oil that is crap. We talked with a guy from Seattle that has a great concept, he will make the oil for you with his machine and your material. He will load them into vape pens and sale it back to you like that. Its a great deal if the oil was any good? Every one i took the pens too liked them and liked the high but just cant get passed the taste?

          • Ouch, you have had some bad experiences I see. I agree with Dave. While I have had many frustrations and tribulations with CO2 in general it has never been the aroma or taste. From the very first(disappointing yield) extractions I conducted at 1200PSI in aluminum tanks it was the presentation and potency of the oil that kept me going. I would have dumped this whole project long ago. It has nothing to do with pride or admitting overpaying for oil.

            If you happen to be in Oregon, I am going to loan GW one of my at-home systems. You can judge for yourself.

            Something is being done wrong for the extract to taste like chlorophyll. Wet material, improper collection, poor source of CO2 containing large amounts of moisture, etc.

    • Posted by woodmizer on October 13, 2013 at 4:19 AM

      I can help:-).

    • Posted by EGHCannaLady on November 1, 2013 at 3:27 PM

      My company uses only co2 oil in our products, we just recently started packaging our raw Co2 oil in syringes. We currently sell to a huge number of collectives in the Seattle Area. Look for Evergreen Herbal products. Lemonade, chocolate and tootsie rolls. All made with Co2 oil, or if youre a dabber you can smoke it straight.

      I dont do the extraction, but I do the de-watering and de-carbing. I know its hard to get information from C02 extractors because everyone kind of has their own way of doing things..

      • Posted by EGHCannaLady on November 1, 2013 at 3:30 PM

        Also the syringes will run you about $20 for a gram and we dont package anything that isn’t over 50% Delta 9 THCA. Every batch is tested ahead of time by 360 Analytical.

  18. Posted by cplamb on September 1, 2013 at 10:42 PM

    Does anyone know where I could find out information on the optical refractive index of supercritical carbon dioxide? I haven’t been able to find anything on line–just the thermodynamic properties.

  19. Posted by Dave on August 29, 2013 at 11:53 PM

    Thank you this whole time I’m looking at heavy duty parts and I was getting most discouraged as I find that a simple flange, valve and numerous other parts are way too much I think the cheapest hi-pressure component I came across was nearly 1000 dollars. I have seen someone on YouTube pull it off using the same method you described with a paint ball tank modified packed with indica and dry ice he simply opens the valve directed into a bottle held by a vice I not sure how successful he was. I know he had some brains however its really hard to take someone serious when they sound like Jim brewer on half baked. I recently obtained green chemistry v4 it was a pain in the ass finding one torrent for the PDF as soon as the irritation from that long search fades away I will Perdue all the other volumes as I am unwilling to pay $580 on the Internet for information. The Internet was intended for the free exchange of information and I prove time and again it still is if your willing to search and not let the money mongrel’s break your spirit. I am self taught in every field that I find interest in. Collage was never an option for me. Doesn’t mean I can’t learn. I have a talent for finding information not so readily available to peasants like myself. I’ll be dammed if all my understanding came from YouTube lot of stupid people out their not to say I haven’t picked up helpful tricks from the 1%. I am absolutely fascinated with your DIY experiment I’m hoping you keep me informed on your progress.. Keep up the good work.

  20. I really love your website.. Great colors & theme.

    Did you make this amazing site yourself? Please reply back as I’m wanting to create my own personal website and would love to learn where you got this from or exactly what the theme is called. Kudos!

    • Thanks for the good thoughts! Joe set it up using one of the standard Word Press templates.

      It won’t do all of what we want, like drop down menu’s, but it has worked well so far otherwise.

  21. Posted by chance rubenaker on August 22, 2013 at 12:08 PM

    love the engineers approach to doing this proper in every sense of the term medicine. medicine isn’t cheap therefore there needs to be pioneers like us that truly care about modifying this process to suit the needs of our medical constituents. can cbd be isolated and extracted this way. I know we all love the psychoactive effects of thc for thrapudic like relief of ailments but what about isolating cbd? without chloroform this will make it past the FDA one day. hopefully. the medical world has now turned to cbd research and with the knowledge you have, you just might be at the forefront of tech for extraction I’ve ever read about. please stay in contact with me because I have severe asthma but need thc/cbd. I need it for adhd and bipolar disorder but smoking enough plant makes me sick. only concentrares for me. my dr. will not approve me combusting plant material but if its just thc no chlorophyll then we no longer have plant material. even bho amber wax containing chlorophyll because of its dark color hurts to ingest. only pure chlorophyll less wax I can tolerate. I ask about cbd because I have a friend who has 30+grandma seziures a week which is so debilitating he cannot even ride a bike or take a bus across town when I gave him a cbd tincture the seizures were rexuced to two a month. this is my problem money time and effort allocated to this obsessio to help me and others alike. my friensa name is joshua lopez he lives in sacramento as do I. I am currently enrolled in college at american river colleges in sac to become an engineer for the cause and to benefit my life with a wonderful career. please help me figure this out. if you have a co-op I can join for the sake of medical research I would greatly appreciate it. contact me by phone or email (916) 410-4333.
    thank you for you time.
    Chance Rubenaker

    • No coops bro, but you are welcome to hang around here and to attend our classes.

      There are dozens of skunk pharmers in our circle sharing notes , even though only three of us started this blog and SPR.

      Extra points if you are smart or purdy.

  22. Posted by Dave on August 17, 2013 at 10:26 AM

    C02 is defiantly the way to go when it comes to extractions. I have dialed in my machine to now produce solid yields every time. I also sent in my oil to sc labs to be tested and it passed the residual solvent test and came back at 81.1% thc. This method is defiantly costly but it is worth the investment to get away from bho and smoke a 100% pure product.

    • What’s the remaining 18.9% of the “100% pure product”? How did a BHO extraction of the same material test?

      • Posted by Dave on August 25, 2013 at 7:37 AM

        Bho with 7x was 73-76% it is impossible to extract 100% thc. I will speak with SC Labs to see what the remaining % consist of.

        • Our BHO extractions after winterization of high THC stains are typically in the high 80′s and low 90′s THC, with most of the rest cannabinoids.

          In our high CBD strains, THC levels vary considerably.

          We didn’t run a GC on the SCFE CO2 sample that we were gifted, but it was extracted at high enough pressure to not be aromatic and to contain a lot of wax.

          When I pulled a -29.5″ Hg vacuum on the sample at 115F, considerable CO2 was liberated, even though I was at a low enough temperature to not be significantly decarboxylating, the complete puddle never did clear, because of plant waxes.

          Fritz at Eden labs says that a sub-critical extraction would extract the least chlorophyll and be the most floral. If we covet floral and therefore have to deal with the plant waxes, it is a small price to pay.

          Taste was mild and the effects were good, so with winterizing and a little process tweaking, I’m convinced that you would have a good thang.

          • From experience in my more cowboy style extractions I have learned that for the best aroma I like to conduct an extraction (3-4hrs or so) at 2600PSI, keep that and then subsequent extractions at around 4000PSI. I collect all of the extractions in the same container and they get mixed in again when I dissolve everything with alcohol.

            Also, no matter what pressure I use my first run has the least wax. I understand that Dave is using a continuous loop style so this is less relevant, but still interesting.

          • The orange oil that you provided was special. Can you get that level of clarity with cannabis oil?

          • Thanks for the orange oil sample!

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  25. Posted by Dave on July 25, 2013 at 5:32 PM

    Yes the extractor is still for sale. Feel free to contact me at

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  28. Hello

    I am interested in CO2 extractors and potentially obtaining your services to consult and implement such a machine.

    Please email me at
    Thank you

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  30. Posted by Dave on June 22, 2013 at 8:58 AM

    Hey gray wolf,

    I wanted to let people know I have a 5liter supercritical c02 machine for sale. I sent you pictures last week of my machine. If anyone is interested please feel free to contact me.

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  32. […] not heard of. Sounds pretty elaborate for the newbie but some of you might find it interesting. DIY CO2 Extraction? | Skunk Pharm Research LLC Reply With […]

  33. Posted by Dave on June 8, 2013 at 2:00 PM

    I will send you pictures tonight. I’m just about with my first run.

  34. Posted by Dave on June 6, 2013 at 5:09 PM

    Hey everyone. I wanted to let everyone know I have finished my 5 liter supercritical fluid extractor. I can send pics if anyone is interested in seeing it.

  35. I visit each day a few web sites and websites to read content, except this web site provides feature based content.

  36. Posted by Alex p on May 31, 2013 at 1:02 PM

    Hey GW great post! I’ve been following this post for a while now and have become pretty seriouse on getting an apeks SCFE but I’ve been trying to find an answer to my main question which I’ve had no luck on. I’m hoping you can help? I’m trying to figure out what difference subcritical and supercritical extractions have as far as the final product Does one have a bigger yield or higher quality then the other? I need to know if I should go with the 5000 psi system or if I’d be ok going with the 1500 psi system from apeks. Would love your input!
    Thanks GW!


    • My research suggests that higher pressures allow more selectivity, but it doesn’t necessarily increase the yield.

      I’ve requested quotes from both Eden and Apeks to compare their systems.

      • Posted by Alex p on June 6, 2013 at 1:30 PM

        Sweet let me know if you get anymore info?

      • Is that higher pressure without higher temps? What I have read and now experienced is that with higher pressure and heat our oils are more soluble in the carbon dioxide. I really wish I could afford just the pump for CO2 so I could experiment with the same pressures at various temps. For now I am bound to heat providing my pressure.

        In my email from before I mentioned providing you with a sample GW. I’ll be in touch.

    • I have a supercritical co2 extractor for sale contact me
      Willing to show final product
      With a purchase comes the hands on walk through with a extraction of course

      • Posted by Alex p on June 6, 2013 at 12:48 PM

        That sounds great, is it an apeks? And if so what liter? You can email me with the info if you want or just let me know here. I’ve been looking at the apeks 1L and the 5L 1500psi systems. But I’ve also been trying to get in contact with some already doing it to get some insight. Just let me know.

        Thanks Robert

      • Hey Robert would love some more info on the extractor you have for sale Thanks

      • Posted by Alex p on June 24, 2013 at 8:47 AM

        i would like some more info on the extractor as well. I posted my about my interest a while ago but got no reply. I didn’t leave you an email address tho so that could be the reason. Hope to hear from you soon.
        Thanks Robert

      • Is the extractor still for sale? Would love to know more and see any photos you may have.

  37. Posted by Praveen on May 31, 2013 at 1:40 AM

    I am planning to set up supercritical extraction plant in India, I am looking for a partner, who manufacture these equipments.

  38. GW, I emailed you some photos of my system with a few of the parts labeled to post up.

    Hopefully they help make sense of the at-home process for everyone. – JY

    • Thanks bro, I got them and will do a brief writeup and post them soon.

      • I would wait another week or two to post. My high pressure cylinder should be here Monday. I am not stopping until I emulate BUTANE yields at an affordable price, with CO2. Throughout the upcoming week I will send you more media.

  39. Posted by Dave on May 20, 2013 at 6:58 PM

    You can also coil your c02 supply line a few times around your heated vessel before it enters to heat it so you don’t need a second tank. Just my thoughts

  40. I enjoy sharing. I want everyone to be able to conduct CO2 extractions at home whether it is with my system or not.

    The typical yields I enjoy from extractions:

    medium grade flower tops – 16-20%
    low grade brick flowers untrimmed – 8-10%

    These are after eight washes of co2 transferred at below supercritical ranges, or after five washes of co2 transferred at above supercritical ranges.

    I sell my kit for $1399 plus shipping. I was able to make it a little cheaper after finding a lower cost supplier. My profit margins are always ABOUT 50% of the retail price so for DIYers you can figure the cost. I know it is bad business to tell this, but I have nothing to hide.

    GW as far as lab results, I do not live in an area that this would be possible. However, give me until the end of this week, Sunday, and I will provide you with a cornucopia of media on my process and extractor. I have someone to film the extraction, and I have acquired a fair amount of base material to be extracted. Finally, I have everything I need to video a full retail model and the entire process.

    Here is a picture of the bones of my hose assembly. The hose is PTFE with SS braiding. The fittings are high pressure SS. All threading is ¼ NPT. The T fittings are very handy for placing gauges next to valves. This will be attached inline to the needle valves. Everything screws right together and needs only teflon tape or more preferably thread sealant. All of it can be found on the interwebbbbb.

    I am considering starting a thread somewhere outlining in detail how to assemble a complete and effective co2 system at home. Not a promo for my system, simply just details and specifications on all the parts needed to build a system at home. As well as various methods to go about extracting. A how-to. Currently I have a million different projects and this would not be pinnacle. If I there is enough interest though, I will work on the thread.

    • Posted by Grounds on May 27, 2013 at 5:43 AM

      Cool system bud, I’ve been eyeing a number of blogs, yours and the present one included. I like the subcritical element that both systems are capable of, because many have expressed concerns with less a less desirable product at supercritical pressures? GW have you made any headway? I guess I’m just seeing what my options are, I was planning on building a Lil Terp until about few a weeks ago when I saw all the recent dev on the CO2 front, here an all over the web. Lets face it CO2 is cleaner and more widely legal (here’s looking a you California ). Can I email you with questions JY? What we need is a CO2 forum, I liked thcfarmer for BHO but they have little discussion on CO2, (at least in the past). Maybe I will try an petition the mods if there is support to create a seperate thread for butane and CO2.

      • My headway has been research, but I’m ready to build a system that will do both sub and super critical extraction. Building a system capable of doing super critical extraction is easy enough, but building one that will extract a pristine oil justifying the additional expense and effort has been the real question. Especially given the fluid exchange rate that the successful commercial C02 SCFE operators report using.

        JY has assembled a DIY system using existing CO2 bottles for the chambers, which seems to extract oil in small quantities, but we’ve yet to sample his product, so can’t comment.

        Here is JY’s link, if you would like to contact them directly.

    • Posted by Andrew on June 24, 2013 at 6:43 AM

      Hello. I am interested in buying your kit. I can be reached at

  41. Tried to post a long reply on here GW and twice the comment is a no show. Not even to say awaiting moderating. Anyways, I have already tried to post pretty much the same thing twice and I don’t want to accidentally do it three times. Have the comments gone through or are they blocked for some reason. They were posted within minutes of this one.

  42. Great information. Lucky me I came across your blog by chance (stumbleupon).
    I’ve saved as a favorite for later!

  43. Posted by Dave on May 12, 2013 at 3:59 PM

    To extract to cannibus oil the liquid c02 will need to soak into the material for a select about of time then you need to start dynamic which u now flow liquid heated c02 through the vessel at roughly 2000psi then flow through a heated needle valve to flush all he oil out. Then into your collection vessel then through a roto meter to moniter flow rate.

    • I collect the saturated liquid CO2 in a closed system through a filter/siphon set up. Then I vent the CO2 off as a gas leaving the oils behind in my collection tank. I am able to transfer all of the saturated liquid CO2 in this closed system into the collection vessel by venting off CO2, then reconnecting both tanks to push more of the saturated liquid into the collection tank. It takes me about three times in my 20# tanks. Then I rinse the collection tank with ethanol and winterize the solution. The needle valve is a good idea but I believe recollection via gaseous purging and then dissolution gives less chance of losing any of your precious oils. Humble Opinion. – JY

      • Posted by kim on May 18, 2013 at 2:42 PM

        very nice. do you have a diagram? thanks.

        • What kind of diagram do you desire?

        • It’s a really simple design. I have some pictures I can send you if you want me too. My design is changing though. This week I am incorporating a >3000psi extraction tank. Scuba 10.2L tank. My adapters will be nonstandard, to say the least. I am deciding to go with steel because in high pressures I can not beat the affordability. I will update in regards to iron oxide leaching if I notice it in the extract or forming on the inside of the cylinder.

      • Posted by Dave on May 19, 2013 at 11:16 AM

        I read your website and now understand how you transfer c02 between tanks then vent to atmosphere to save oils. I have built my system similar to supercritical fluid technologies product using a custom build pressure rated vessel and a high pressure c02 pump to maintain pressure throughout the flow process. I’m also using heaters and thermocouples to adjust and moniter heat instead of water baths. I’m trying to build a 20k$ 5 liter system to compete against the larger Gus while using there same type of equipment and flow process.

        • I see, I was chiming in on affordable extraction. That sounds really sweet though man and I wish you good luck!

          When I am able to source some SS parts and I can build my own chambers afford ably, then I will definitely have the collection chamber equipped with a removable bottom so that the cash oil can be scraped out if people choose to not winterize. Which wouldn’t be terrible because of the additional aromatics and co2 does not pick up nearly as much wax as butane and hexane do from experience.

        • Hi Dave,

          I would be interested to here more about your machine and progress. I believe I could be helpful…

  44. Posted by kim on May 10, 2013 at 1:04 PM

    I was thinking that the cylinder size will be the limiting factor to what we can process
    at one time so we may want to work with tumbled, sifted kief instead of whole leaf/bud. I’m not sure how well the CO2 would penetrate kief to make the ‘extraction’ though. I wonder if the cylinder may have to be shaken or stirred with the CO2 to get penetration and extraction of the cannabinoids. Liquid CO2 is better than ‘dry ice’ I think for our purposes and bottles of CO2 are available. I’m wondering how we release and capture the extracts though after the proper ‘contact’ time with the CO2.

    • Super critical fluids are super solvents, which will penetrate the kif with no problem. Usually no shaking or stirring used, but sonication would no doubt speed up the process.

      The oil is usually captured in a decompression chamber, where the CO2 is bled off, leaving it behind.

    • Even liquid CO2 has decent penetration, carbon dioxide in general penetrates well due to its linear shape.

  45. I wonder if you can replace the co2 tank with a warm water tank. It might separate too much but with the right temperature and amount of pressure. IDk I’ve heard of a guy in cali doing it but no info how. Saw this diagram and thought he prolly uses something similar.

    • I haven’t heard of it, but I would be interested in seeing his process!

      • I conduct super and sub critical CO2 extractions AT HOME on a daily basis. Yes, I do sell the system, but I am not posting just to promo. I explain pretty thoroughly how I go about my extracts. If someone so desired they could read into my thorough instructions which would be enough to attempt assembling your own system. Anyways, if you are curious in the manner in which I conduct extractions then check out my blog. I update it all the time. Since I have a fair amount of these extractions under my belt I would love to answer anyone’s questions about the extractions or the extractor. – JY

        My blog is at

        • Thanks for sharing your techniques bro! We’ve touched on several other forums and I see that you’ve found your way here.

          I checked out your blog and process and am of course intrigued with any simple process that works and is affordable to ma and pa. It looks like you have managed to do SCFE extractions using simple aluminum C02 bottles for the vessels, vis a vis building something from scratch. Simple is good and I both salute your efforts and encourage you to share more!

          You may also share what you are selling your kit for, and it would be helpful to the readership if you would share what percent yield you typically enjoy, how many wash cycles are required and total time elapsed from start to finish?

          If you will send any pictures, or laboratory analysis that you would like attached to graywolf@skunkpharmresearch, I will add them to the thread, to emphasize your process.


  46. Aw, this was a very nice post. Spending some time and actual effort to create a great
    article… but what can I say… I hesitate a whole lot and don’t seem to get anything done.

  47. Good replies in return of this query with firm arguments and telling the whole thing on the topic of

  48. Posted by kim on May 4, 2013 at 9:33 AM

    according to Wikki ‘supercritical’ co2 cannot be below 1000 psi about 70 atmospheres
    and 31 Centigrade. the chart is there to see. so we need containers to handle this pressure / temp and then go from there …..

    • Bingo… that’s where I started.

      • You will find that MOST CO2 cylinders can easily handle low end supercritical pressures. The typical operating pressure is 1800psi for newer tanks. With testing pressures of 3000 psi, and burst pressures somewhat higher than this. This makes a lot of sense when you consider that the temperatures needed to achieve “supercritical” (above ~1080psi) conditions in a container properly filled with liquid CO2 are lower than a tank sitting in a flatbad driving through Arizona during the summer will experience at proper fill levels.

  49. Posted by kim on May 4, 2013 at 9:07 AM

    Apeks Super Critical Benchtop System unveiling!

    holds 1 liter of material and the process is 2-4 hours and it costs
    about $18,000.

  50. I am curious to find out what blog system you are utilizing?
    I’m having some small security problems with my latest website and I’d
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  51. Posted by Vitaliy on May 2, 2013 at 5:39 AM

    Hey GW
    Did you get my letter?

  52. Posted by kim on April 26, 2013 at 6:13 PM

    any update on the DIY c02 extraction?

  53. Posted by Mke Vanderlinde on April 19, 2013 at 11:17 PM

    Hey GW

    Just ran across your site–wonderful source of intelligent info by the way–in my searching for the Holy Grail of extraction methods…SCFE. It has occurred to me; due to the inherent tunable nature of this process, do you suppose it’s possible to extract and isolate THC and CBD separately and then recombine them at a more desirable “user defined” ratio? This could open the door to many great possibilities in designing for cancer treatment I would think.

    Any thoughts?

  54. Posted by Ketabyte on April 14, 2013 at 9:54 PM

    Hello, I’ve been following your site here for a few months. Great stuff. I finally got a question.

    Could I do a Co2 extraction using a column type extraction chamber made of pvc and running food grade gas co2 from a 5lb tank directly into the product without heating or pressurizing to super or subcritical and extract anything?

  55. Posted by Andres Navarro on April 14, 2013 at 5:08 AM

    Thank u for.ur in ur time,

  56. Posted by Dave on April 5, 2013 at 9:26 PM

    Hey gray wolf,

    I am I the process of building a extraction vessel similar to your simple minded design and I had a few questions for you, I would appreciate it if you got ahold of me.


  57. Posted by Squeak on March 3, 2013 at 12:41 PM

    So… As far as the difference between subcritical and supercritical… it’s the pressure differences… At supercritical pressures and moisture in the product can then react with the co2 and make carbonic acid, which will cause the oils to go rancid.

    Low pressure CO2 is often the best method for producing high quality botanical extracts. CO2 has a high loading rate in this state, meaning that you will have to pump many volumes of CO2 through a given volume of botanical. The loading rate is typically 10-40 volumes. For this reason, it is important to have a high flow pump and a CO2 recycle system unless wasting high volumes of CO2 is not a concern.

    Supercritical CO2 has a much faster loading rate 2-10 volumes and a wide range of uses..

    • Thanks for sharing the insight bro!

      • Posted by Squeak on March 17, 2013 at 12:10 PM

        not a problem, and if I may recommend, if you’re making this from parts that you’re sending to get made at a machine shop, I inspect steel for defects after manufacturing processes like welding, heat treatment, and even after general use for fatigue as a living, please have your welds inspected, 250-400 PSI exploding in a rubber vessel is enough to kill a man, let alone 1000+ from a steel vessel that will splinter and shred you to bits…

        To do this yourself, I can teach you, it’s fairly simple once you realize how magnets work, and how to exploit them to test magnetic objects.

        • Good point, it can be non-destructively tested using magnetic particle, flourescent penetrant, or x-ray.

          • Posted by Squeak on March 25, 2013 at 9:31 PM

            indeed it can, I would avoid penetrant and wet mag particle, if you’re going to do it with mag particle go with an AC yoke and iron particle at about 2-3 microns, shake some on with the AC field in the piece, tap with hammer, look for zipper like lines, they are either defects or cracks. fluorescent penetrant generally penetrates by way of a solvent or creeping oil, this would defeat the purpose of having a co2 extraction system, as you would have residue from the testing process. x-ray would be fine, just don’t x-ray it too much, or then you wouldn’t wanna touch it… x-ray systems are way more expensive. if you have an 1/4 inch flat lip on the edge vessel you can test with an ultrasonic unit too.

          • Thanks for the insight bro, a good subject! We used all three for aerospace and both penetrant and x-ray for medical components.

            Penetrant should only leave difficult to remove residue with cracks or microporosity, which shouldn’t be present in a machined and welded billet. We washed them in an alkaline bath, followed by a Nitric/Hf acid bath, and then after high pressure water wash, we baked them out at 400F

            We typically didn’t use magnetic particle for non-magnetic austenetic alloys, which would be my alloy of choice for the pressure chamber, because of its subzero properties.

            The containment yoke would ostensibly be medium carbon steel, which magnetic particle would work on well. Carbon steel at sub zero temperatures becomes a fragmentation bomb.

            For those readers who would like to learn more about non destructive testing, I recommend Nondestructive Testing Handbook, put out by The Society For Nondestructive Testing and Volume 11 of the Metals Handbook, by American Society for Metals.

            We did some ultrasonics and eddycurrent NDT inspection, but relied on ultrasonics more for dimensional inspection, than to find tight cracks in heavy walls, because of sensitivity

  58. Posted by Dr. Teeth on February 27, 2013 at 7:36 PM

    Does anyone have a design schematic for Apeks, Eden labs or any other SCCO2 extractors? Any links are appreciated.

    • Here is one I picked up from Google CO2 SCFE extraction:

      At the bottom of the main article, there is a button to push for a schematic.

    • Posted by Patrick on February 28, 2013 at 11:02 AM

      Even with the schematics you will be hard pressed to make something that can pressurize properly(unless you are a hardcore metal fabricator).

      • Or have access to one as project manager. I use outside machine shops for anything that I don’t want to or don’t have the capacity to make myself. I also pick the brains of fellow engineers in their respective fields, when I’m outside my own.

        Point well taken though. Building anything operating upwards to 10ksi is not a casual garage project for even the mechanically gifted. You must pay attention to details to win, and there is great potential for disaster, so it shouldn’t be under taken by anyone without the mechanical knowledge and skills required.

    • I don’t but pretty sure if you contacted either one, they would share one with you. Both have certainly been helpful to me.

  59. Posted by Pepe on February 20, 2013 at 12:51 PM

    CA, CO and WA, we have developed a CO2 machine for light commercial use. The first machine is in So Cal. We will be releasing the machines for sale in 3 months. $ has not yet been determined. Training will be available. We do not have a booth in Denver in May.

  60. Posted by Pepe on February 19, 2013 at 1:15 PM

    Our CO2 machine is up and running. We are now testing the finished product. All looks good!

  61. Posted by Pepe on February 11, 2013 at 1:21 PM

    We are installing our first SCF machine next week. Very excited its been three years in the making. Stay tuned SCF group.

  62. Posted by Dr teeth on February 8, 2013 at 12:43 PM

    I am looking to purchase a SCCO2 extractor and am attempting to shop around; which has proved to be difficult due to the fact that I can only find two companies in the US: Apeks fabrication and Eden labs. Does anyone else know of any other companies? If so, can you hyperlink anything on the web about them?

    Thank you

    • Perhaps Autoclave Engineering?

    • Posted by Patrick on February 20, 2013 at 1:08 PM

      Eden Labs is the way to go. I’m satisfied with my purchase. Good service and product.

      • Yeah, I am a ingenue on the subject, but I understand from users that they make a good reliable product, even if it may not be the latest state of the art technology. They certainly appear to get the job done from my perspective and are not bashful at pricing their product.

        I actually contacted them for a quote before deciding to build one, or buy a competive unit, but the salesman was preparing for a trade show and too busy to carry on a meaningful conversation with me and as a bottom line, I never recieved my quote. He acted like talking to me was a waste of his time and as I failed to receive the quote that I requested, I infer that he must have felt that way.

        As a retired manufacturing engineering purchasing capital equipment, I found that when front end service is poor, that customer service is usually poorer after the honeymoon, so I crossed them off my list. It sounds like you had a much more positive experience!

        • Posted by Patrick on February 23, 2013 at 10:47 AM

          Wow. I had a totally diff experience. Are you sure it was Eden Labs? I talked to Fritz. Totally knowledgeable and we talked for 45 min. Call him all the time for new info. I don’t think they have salesmen? Maybe it was a while ago? They have been around since 1996 I learned. I looked around and could not find anyone else in the US who made what I considered, safe, uncomplicated (I am not an engineer) professional systems with the knowledge about the industry to back it up (Apeks is new to the industry and just copy Eden Labs so the rumor goes. Maybe it was them you talked to?). Pretty amazing scoop on the entire industry if you get Fritz on the phone. They had a guy who trained me and the machine makes amazing oil…comes out like soft serve! Fing unreal. Cool that you are doing your own tho. Hows that going? I have made some bank and am thinking about buying another machine from Eden with Chromatog. Curious about yours.

          • Still in the R&D stage and getting more complicated as I focus on making oil better than BHO, as opposed to just achieving SCFE CO2 extraction.

            Sounds like I should have cut the chase and asked for Fritz!

          • Posted by Dr teeth on February 24, 2013 at 12:33 PM

            Uhh just to clarify, Apeks actually designed and worked for Eden labs for years before opening their own company. So I guess they are copying themselves, except they have made a lot of improvements. Like does you Edens lines get clogged at all?

          • Andy Joseph (Apeks Fabrication) was the engineer and welder that designed all of the machines that Fritz makes at Eden Labs. In fact, he built almost every single machine that Eden has sold. Andy worked at Eden for something like 13 years and left Eden almost a year ago and has further improved the machines while on his own at Apeks. I”m surprised Fritz is still even building co2 machines without Andy.

            Apeks is the way to go.

    • Posted by Patrick on March 12, 2013 at 12:38 PM

      “Like does you Edens lines get clogged at all?” I couldn’t reply to your post below. No I haven’t had problems with clogging, where did you read this?

    • Posted by Atikrant on April 9, 2013 at 5:58 AM

      We can supply SCFE plant.
      Mail me to

  63. [...] to the full curve of pressures and temperatures as they build. You can follow our progress at…o2-extraction/ Reply With [...]

  64. Hi Greywolf, I have been following your info on different sites now for close to 15 years and feel it’s time I give something back. I have a 20 Liter 1500 PSI Supercritical Extractor that I own and run at my bakery in Denver Colorado. If you are ever around and would like to visit or even come by and watch us run my machine, I would love to share some info. What’s all the knowledge about anyway if it’s not to share? I am a big fan and feel I should return the favor as I have learned a lot from you and your fans.


  65. Posted by Chris T, washington state on January 1, 2013 at 9:05 PM

    I’ve been making an extract using 99.9% isopropyl alcohol, commonly refered to as “Rick Simpson Oil”. Recently I’ve become aware of this co2 extraction method and have been searching for either a DIY system or a reasonably priced commercial system. Do you plan on selling your system or plans? Can a non scientist actually do this stuff? Do you know of any good systems already on the market? I would think it could pay for itself quickly.
    Thanks for sharing.

    • We don’t sell anything but equipment leases and license to use our manufacturing network to build our equipment, and we give away the plans and component sourcing free. We haven’t built any test sleds yet, so the quality of my design is conjecture at this point.

      We do plan to build a unit this year, so you might continue to watch this space until we have a proven working design.

      I think a non scientist can operate a SCFE system and with plans, it wouldn’t take an extensive amount of mechanical ability to build one. You can always hire out the machining and welding, if they are not your forte, or you lack the equipment.

      Sorry, no advice on who makes the best commercial system, as Eden Labs is the only one we looked at in any depth, and the feed back I get from commercial operators, none of which are operating an Eden Labs unit, is that it works reliably, but isn’t as sophisticated as some others available!

    • Hi Chris,

      Shoot me an email, I can help with SCFE units.

  66. So with the new year days away am I to see anything here new soon

  67. [...] and collect the oil. I need to update the post, but here are some thoughts on a DIY system:…o2-extraction/ Reply With [...]

  68. Posted by Mr F on December 21, 2012 at 8:15 PM

    Another reason that SCFE is so important is because butane extraction is illegal in the state of California and patients do not always have access to legal medication for this reason. SCFE is legal but up until now required a very expensive machine to make.

    As always, I will be watching intently for any updates.

  69. Posted by Mr F on December 19, 2012 at 12:03 AM

    Hi GW

    Just wondering if you have made any progress with your SCF extractor?

  70. Posted by L3v1 on November 21, 2012 at 10:46 AM

    I googled Chlorophyll.
    Chlorophyll is considered nonpoisonous. Most people who swallow chlorophyll have no symptoms. In rare cases, the following symptoms may occur:
    Diarrhea, Loose bowel movements (stools)
    Stomach cramps
    Liquid chlorophyll is miraculous. It has SO MANY health benefits it makes it a true wonder-food. However, the most marvellous and amazing benefit it gives comes from the fact that its molecular structure is absolutely identical to hemoglobin except for the center atom. In hemoglobin this is iron, whereas in chlorophyll it is magnesium. This means that when ingested, liquid chlorophyll actually helps to do the job of hemoglobin (hemoglobin is so vital to the health of our blood – in fact, blood is approx 75% hemoglobin). It helps to rebuild and replenish our red blood cells, boosting our energy and increasing our wellbeing almost instantly.

    I don’t get it, I copied and pasted this information from online for your concern of being poisoned. My question is can I make concentrated oil from doing this with a test tube like in the video, but with weed instead of orange peels. I need a recipe to apply this oil to my e-cig. It’s for stealth and my health. Please I have no reason to offend anyone here but it seems like your misinforming with lies to detour the truth. My question was could I ingest the oil produced from this process. If concentrated chlorophyll is my only worry then here’s to my health. Is there anything you can tell me legitimately about this that may cause a real concern?

    • I googled Chlorophyll.

      Chlorophyll is considered nonpoisonous. Most people who swallow chlorophyll have no symptoms. In rare cases, the following symptoms may occur:

      Diarrhea, Loose bowel movements (stools)
      Stomach cramps

      Liquid chlorophyll is miraculous. It has SO MANY health benefits it makes it a true wonder-food. However, the most marvellous and amazing benefit it gives comes from the fact that its molecular structure is absolutely identical to hemoglobin except for the center atom. In hemoglobin this is iron, whereas in chlorophyll it is magnesium. This means that when ingested, liquid chlorophyll actually helps to do the job of hemoglobin (hemoglobin is so vital to the health of our blood – in fact, blood is approx 75% hemoglobin). It helps to rebuild and replenish our red blood cells, boosting our energy and increasing our wellbeing almost instantly.

      I don’t get it, I copied and pasted this information from online for your concern of being poisoned.

      The part that you seem to not get, is scale or degree. Chlorophyll poisoning is uncommon from normal sources, but the game changes when you start concentrating it.

      Chlorophyll OD is the single greatest cause of other providers patients coming to Skunk Pharm Research for relief.

      The reason that I suggested that you Google Chlorophyll poisoning, was an attempt at giving you perspective, without wasting space on this forum.

      The poison is always in the dosage. Google Oxygen and note that while generally considered salubrious, it is toxic above 75% atmosphere.

      My question is can I make concentrated oil from doing this with a test tube like in the video, but with weed instead of orange peels. I need a recipe to apply this oil to my e-cig.

      No you may not effectively extract oil for e-cigs using dry ice in a test tube, for reasons that I have already outlined to you. Is that direct enough for you?

      It’s for stealth and my health. Please I have no reason to offend anyone here but it seems like your misinforming with lies to detour the truth.

      Misinforming with lies to detour the truth was not my intent, Your attitude lack of social graces has caused me to question your intent.

      You are welcome to visit and view this site, but recieving support from us is strictly voluntary on our part, so if you aren’t getting what you want to hear here, feel free to find another forum that tells you what you want to hear.

      My question was could I ingest the oil produced from this process.


      If concentrated chlorophyll is my only worry then here’s to my health.

      Your first worry is that you are barking up the wrong tree with the process you propose.

      Chlorophyll concentration may or may not be an issue, depending on extraction parameters.

      With that attitude, I trust you produce only for yourself, so as not to be a danger to other patients, who may have weaklened systems.

      Is there anything you can tell me legitimately about this that may cause a real concern?

      No, I’m sensing we have nothing of value to you and suggest that you try it your way.

      I tried to answer your questions and explain to you why, but as we seem to communicate poorly, and you resort to personal attacks, it leads me to believe that the odds are poor for us discussing the fine points?

      Bon appetite bro! You may post no further comments until you have something meaningful to offer, and learn to play nice in other peoples homes. I have already deleted your followup post

      • Posted by L3v1 on December 6, 2012 at 6:03 AM

        I’m sorry to offend you. You did admit to having a vague attitude because of space being wasted on this forum, presuming I would capitalize from it, or calling me bro? (Whiskey Tango Foxtrot). Just give to me or anyone else strait and not give vague repulician like responses to impress your groupies.

        • I’m going to take a wild stab in the dark and guess that English isn’t your native language, so that you are unaware that you are not asking for answers to technical questions, but taking my personal inventory for not meeting your expectations.

          Your evaluation of my motives, vis a vis simply saying that you don’t understand what I just said, is perhaps the central issue.

          I talk the way I do, not to impress groupies, but because at my age and life’s experience, that is how I talk and I need make no apologies.

          I’m frankly surprised that someone with your limited English communication skills would consider our lack of communication in English wholly my problem.

          Despite how far I usually go out of my way to make sure communication has taken place, I still decide who I want to provide pro bono support and information to.

          To my shame and discredit, I’m not highly evolved enough to provide that support to folks who want to focus the discussion on my short comings, as opposed to the purpose this blog is intended for. I therefore reject your plaudit to start a fight and no more of your comments will be approved.

          Is that straight enough for you?

          Peace brother!


  71. Posted by L3v1 on November 18, 2012 at 1:02 PM

    Like in this video ,
    Can I replace the orange peal with cannabis? How well would it work?

    • The principle will work, just not well. One of my commercial resources tells me that a liquid extraction around 350 psi, will extract all the stuff we are looking for, but also extracts stuff that we don’t want, so more refinement is required, for more refined results.

      • Posted by L3v1 on November 19, 2012 at 3:01 PM

        What wouldn’t I want to to happen? Would it still be ingestable? My goal is to use the oil in my C-cig. I know BHO works the best but if I could use the dry ice at less cost, if it was done that way in the video. I’ve tried a couple driffrent ways some agree to working, but I’m not convincing myself with my own recipes.

        • Not sure I understand the question??

          Nothing you would have done to it would make in in-digestible that I’m aware of, except perhaps load it up with too much chlorophyll. Chlorophyll concentrate gives some folks severe gastric distress; Google Chlorophyll poisoning, and note the symptoms.

          If it is about product quantity and quality, extracting D-Limonene (C10H16) doesn’t mean you get the same extraction rates and quality extracting the much longer and heavier THC (C21H30O2) molecule.

          You in fact don’t, and such a process would take a long time and produce a low yield of an unknown product.

  72. Posted by phil on November 15, 2012 at 10:07 PM

    hey grey wolf. It sounds like you know what you’re doing. I have extracted using a few different solvents. I have used butane, propoane and supercritical and subcritical co2. I would love to talk to you about my machine and possible methods if you are knowledgable in this. Thanks for your help.

    • Hi Phil!

      Thanks for the good thoughts, but I’m still a SCFE student myself, and you deserve the very best.

      Check your yahoo e-mail for contact information with one of the SCFE pros, whose keen mind I pick on the subject. Please feel free to contact me again, if you still have questions.

      Peace, GW

  73. Posted by Mr. F on November 13, 2012 at 8:37 PM

    Just to clarify GW, when you say you’re adding a second chamber to control the pressure parameters, are you talking about a dry ice method or liquid co2?

    Also how are you able to control the heating element in conjuction with the pressure that you desire? Is there a piece of equipment that can measure pressure and have a switch for the heating element?

    TY, you’re quite an inspiration for us all!

    • I will add a second chamber for use with both methods.

      I plan to set the mechanical back pressure regulator at the pressure that I wish it to bleed off at, and raise the temperature of the column using clamp on pipe heaters, controlled by a thermocouple in a well, and a PLC.

      I think it would be premature for me to start recommending parts, but there are any number of temperature controllers available, which can be used in conjunction with a dry well.

      The heating elements can be controlled using Crydom solid state relays to control the heavy amperage, yet require only a few volts at milliamps, to turn them on and off.

      Our 2012 plate has been full with building our new lab, but my R&D projects will be my focus in 2013, and I will happily share my discoveries as they come up.

  74. Posted by Sam on November 11, 2012 at 8:13 PM

    Is it possible for the author of the passage outlined as I. extraction, II. separation, III. purification to divulge further detail? Would be greatly appreciated.

  75. Posted by 408SHARK on November 1, 2012 at 11:17 PM

    so will doing the same process of extracting limodene work at a smaller scale?

  76. Posted by Lenn P on October 23, 2012 at 11:47 AM

    would really like to talk to you guy’s I run at 15Degc and 65 Bar for 8 hrs yeald 60 to 120 grams per 2.5lds

  77. Posted by jack pot on October 15, 2012 at 4:46 PM

    hey very cool i am thinking about making one of these have you made one yet and had a successful run. i would love to see some more pics im have any suggestions that you can send me maybe we can help each other out i am very crafty and love inventing new things i’m just wondering is it really that simple like in your drawings.

    • SFE can be accomplished as simply as my drawings, but indepth study shows that more complication is required to closely control the results. I haven’t built one yet, because I want not just SFE, but an extract worthy of the expense and effort.

      What looks like a better arrangement, is to use two vessels, so that the CO2 can be brought up to pressure before introducing it to the material, so that extraction occurs at only one pressure and temperature.

      Updates soon!

  78. Posted by AfterGlow on July 30, 2012 at 1:32 PM

    Updates (if any) would be greatly appreciated on this post.. this is exactly the type of information and discussion I’ve been looking for

    • Updates soon bro! I have been information gathering from SCFE operators and have decided to make the system more complicated by adding a second chamber. That will allow me to bring the C02 up to the proper temperature and pressure, before introducing it to the plant material, so that I can extract at specific pressures. Otherwise, I will be extracting at a range of temperatures and pressures.

      My goal is not only to extract with super critical C02, but to produce a pristine tasty and effective product, worthy of the effort. Input from the experts operating commercial units, suggests that such a high quality product is possible, but not without close control of the parameters.


  79. how much does that cost me?

  80. If you still need help with the printer you have no idea how happy it would make me if I could help :)
    I’m a Caregiver back east who has been addicted to your site since finding it a week or two ago. I also own a computer company and not only have tech’s available for the printer but also would like to volunteer web assistance if needed as well. We host sites, build them, program etc.
    Been meaning to contact you guys anyways as I want to start building a terpinator here and don’t know if I could pull it off without guidance from you guys anyways :)
    And thanks again for all the inspirational work!
    Please let me know if we can assist.

    • Well thanks, you have no idea how happy it would make me for my printer to work from my Windows 7 Virtual XP mode! I’ll contact you via e-mail to discuss.

      Also happy to help you build your Terpenator. I’m helping four different folks with their Mk I builds as we speak.

  81. I figured it out, Dry Ice isn’t a practical solution for extraction. Liquid CO2 has a much better density, making it easier and more practical for reaching proper temps and pressures!

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