This technology is old now and always seemed obvious to me seeing how its the same schema as fractional distillation. and I’ve been working in co2 extraction for 8 years and keeping my ear to the ground for this sort of thing but still haven’t seen any good data sets on this topic. by good data sets, I mean one that shows how the pressure and temp settings of collector 1, 2, and 3 affect the compositions of the others downline
for alil backround
I remember that the extraction vessel was at around 2500-2800psi 122f for maximum extraction without chlorophyll which starts to dissolve at 2800-3000 +psi
so first collection-A pressure was right below critical pressure 1000 psi and at or near 95f
collection B was between 600-800 psi and 80f
collection C was 375 - 425 psi
most of the time i would we would just split two fractions the terpene fraction and the cannabinoid fraction or just the terpene+cannabinoid fraction and the wax fraction
To this end, preferably a high-pressure column (FIG. 3) subdivided into segments, comprising a bottom segment for dissolving the primary extract in supercritical CO2, a purification segment filled, e.g., with silica gel (mean particle size of 0.02 mm to 0.2 mm, preferably 0.1 mm), a head segment for discharging the mixture dissolved in supercritical CO2 of CBD, Δ8-THC and Δ9-THC into three separating vessels for separate separation of the purified CBD and the purified Δ8-THC and Δ9-THC.
The extraction conditions prevailing for purification in the column are supercritical for CO2, preferably 180 bar and 55° C., in the first separating vessel where CBD is separated out for CO2 subcricital conditions in terms of pressure and supercritical conditions in terms of temperature, preferably 70 bar and 50° C. In the second and third separating vessels, where Δ8-THC and Δ9-THC are separated out, conditions subcricital for CO2 in terms of pressure and temperature are to prevail, in the second separating vessel preferably 60 bar and 30° C., in the third separating vessel preferably 55 bar and 25° C.