Complete CO2 newbie here, only ran a few CO2 runs in my days and haven’t been taught much about it, but i’d like to understand the information you are explaining here, so I apologize if this is a silly question!
Any chance you could tell me how you are calculating your density?
Its not a silly question. Understanding the solvent density is the key to getting what you want out of CO2.
I cant add links to my reply but if you send me your email I will send you some resources.
I don’t know. I have heard this before but have yet to see data to back it up. There are numerous studies on ScCO2 and terpene extraction from other botanicals and I haven’t seen one yet where they quantified degradation. If you look at the peer review they all seem to come to a similar conclusion that 300kg/m3 or under is a good solvent density for terpene extractions.
Its definitely possible that running too high of a temp would cause issues though. I run my terpene extraction at a set time of 45 mins per 3000g of feed and get great yields. Its all relative to the equipment and method though.
What are you guys calling terpenes?
Just the monoterpenes? What about monoterpene alcohols, sesquiterpenes and their alcohols, or even the triterpenes? Does anyone have data they’d like to show (don’t care about chemovar type) in terms of percent yields of material before and after.
Unfortunately, we sold our CO2 systems before I could research this so I have a tiny amount analytical data to present. The only experiment I have that was done is this sub-critical run. The tech didn’t record the parameters, of course, nor did they submit the material for a pre-run terpene analysis:
Terpene Profiling
64.11% Total Terpenes by Weight
Percent mg/g LOQ mg/g LOD mg/g Label Claim % Status
b-Myrcene 12.58 62.91 0.1 0.03 - Pass
Nerol 0.03 0.14 0.1 0.03 - Pass
Nerolidol 1.43 7.17 0.1 0.03 - Pass
Ocimene 0.61 3.04 0.1 0.03 - Pass
a-Bisbolol 3.30 16.49 0.1 0.03 - Pass
Farnasene ND1 0.00 0.1 0.03 - Pass
Valencene 0.88 4.39 0.1 0.03 - Pass
d3-Carene 0.04 0.19 0.1 0.03 - Pass
d-Limonene 3.07 15.37 0.1 0.03 - Pass
g-Terpinene 0.05 0.26 0.1 0.03 - Pass
a-Pinene 7.97 39.83 0.1 0.03 - Pass
Sabinene ND1 0.00 0.1 0.03 - Pass
b-Pinene 3.97 19.85 0.1 0.03 - Pass
Camphene 0.23 1.16 0.1 0.03 - Pass
Eucalyptol 0.31 1.54 0.1 0.03 - Pass
(-)-FenchoneND1 0.00 0.1 0.03 - Pass
Fenchol 0.92 4.61 0.1 0.03 - Pass
Camphor 0.03 0.14 0.1 0.03 - Pass
Borneol 0.09 0.45 0.1 0.03 - Pass
Pulegone ND1 0.00 0.1 0.03 - Pass
Cedrol 1.98 9.89 0.1 0.03 - Pass
b-Caryo 16.01 80.07 0.1 0.03 - Pass
Elemene ND1 0.00 0.1 0.03 - Pass
Phelladrne 0.09 0.43 0.1 0.03 - Pass
Isopulegol 0.07 0.35 0.1 0.03 - Pass
Linalool 1.42 7.11 0.1 0.03 - Pass
(+)-Fenchon0.07 0.34 0.1 0.03 - Pass
a-Caryophyl 6.45 32.25 0.1 0.03 - Pass
Guaiol 0.83 4.15 0.1 0.03 - Pass
Bergamotene ND1 0.00 0.1 0.03 - Pass
Terpineol 0.98 4.91 0.1 0.03 - Pass
Terpinolene 0.66 3.32 0.1 0.03 - Pass
a-Terpinene 0.04 0.18 0.1 0.03 - Pass
Yield was low and the machines were on their way out the door. But based on discussions with CANN ACS members yields can be improved to acceptable levels. Hydrocarbon yields and fidelity to starting material are much better than this.
But I believe claims made by CO2 terpene extractors so I’d like to have data so I can convince management to give it another go.
Thanks all.
Hi all I’m currently using a IES 20l system to pull Terpenes. Peramaters seem to do the job well but pull unwanted lipids and waxes. Been using the machine for 6months. Would really like to understand the system and science more. Anyone have links to info/books/studies on supercritical cow? Thanks gang.
Here is the GC/MS data from the method I use. Its a mix of monos and sesquiterpenes. Due to the low density this method can be ran until complete extraction as there is no co-extraction of waxes or cannabinoids. The D9 that popped up in the analysis was likely due to carryover from the previous extraction. Unfortunately I do not have the feed material data.
Also here is the data from a 2nd extraction of the same material but at a higher density in the 500kg/m3 range. You can see much of the higher molecular weight terps were left behind partially and the waxes and cannabinoids are starting to be co-extracted.
how come the solvent density goes down with increasing temperature? Why not a subcritical run with 300kg/m3?
Also, any tips on processing the terpene pull afterwards??
Thank you
Great thread with a lot of data here, thanks @CriticalPoint !
How fresh is the material for a good terpene pull? Do people typically dehydrate the biomass with any heat prior to extraction, or it is all good as long as the moisture is under ~10%?
It seems 5% or less water content is ideal, you should be fine around 10%. I never use any type of heat or dehydration beforehand. I’ve posited getting a freeze dryer, not yet unfortunately.
Stuff that’s less than 6 months old I reliably get super nice pale yellow to orange terp fractions. (Seems to be stuff composed of 4 or fewer isoprene units.) Which all collects with water in my 3rd collection vessel. All of the stuff with more than 4 units goes into vessel 2.
Does anyone know where I could find someone selling CO2 extracted terps? I’ve been looking everywhere but it’s been quite hard to find.
The several CO2 extractors I know of don’t sell their own, they use them. @TheFrenchie has a connection I think.
My connect is in “transition” from a lab to another, I will let you know as soon as they have some for sale. For now, I am using what I got left (not much). I am also on the hunt for that since I post that I was looking for that too. If there is someone in New Mexico or Oregon (I cant order from Canada bcoz of the state regulation) I can make something work I think, no lie, I DM every person with an Apex machine on IG lol
Just out of curiosity, if you can say, how much, roughly, do they charge for what quantity?
We used to have an APEX but no longer.
Last time I pay like 80-90$ per gram for an oz. Look like a fair price to me.
Yep that’s in a good range. Sounds like you’ve got some higher end product already going on in Canada. Once most people get a taste of the real essential oils, the old plant blends don’t do it.
i’ve been using a Eden supercritical extractor, and i cannot seem to get a consistent yield on my terpenes. keeping all temps and pressures the same but yields vary a lot. all the material was same strain and harvest date. any thoughts?
How are you packing your column? If it’s too tight the solvent can channel through the biomass and not give you a full extraction
Are you at liberty to discuss the pressure step down for each chamber?
No unfortunately I cant disclose that… if I could it would make things alot easier
Material is loosely packed but I change flow direction to keep from channeling
