Liquid CO2 + cosolvents at 60bar -> different ball game!!!

[GrassMan]

Hi,

Most of the threads, if not all of them, that reffers to CO2 extraction, are related to supercritical extraction.
There are even a few labs that invested their money on expensive supercritical extractors, but....

A SUBcritical setup, way more affordable, will make a better extract (due to its high selective properties at lower pressure). Adding 2% ethanol as cosolvent will increase its efficiency.

https://www.google.co.il/patents/EP...a=X&ei=0rKmUtGsJ4GShQfLx4CoCA&ved=0CEcQ6AEwAg

Peace

 

[Momerath]

This is a neat read, always love reading about CO2 extraction. This doesn't look like anything really new, though. I've talked to a CO2 SFE guy and he talked about subcritical for a bit, saying it does make a nicer extract, but yields suffer over SFE. Said somewhere on the order of 5%-10% average yield. I think that if making actual medicine from large volumes of average grade material, this wouldn't be so bad. However, most of us in the extraction game (state-wide anyway) need better yields than that to make it economically viable. For those doing it for personal use, any kind of CO2 extractor would probably be out of the price range for anyone but the well to do hobbyist.

Not to retract from the OP, which is really great info for anyone interested in CO2 extraction! Worth reading if you have an extra hour or two

 

[RHH]

I've spoken with quite a few guys out there doing subcritical extractions in the 1000psi +/- 200. For the most part, despite some prodding on my end, they have been unwilling to give up specific information. If you look at the extractors that vendors such as Apeks Fab offer they give the option of units rated to 1200psi or 5000psi.

My superficial understanding is that higher pressure supercritical extractions tear the plant material apart further and produce lower quality extracts as a result.