1% to 3% ratio ethanol to Co2 during extraction and 10% to 30% ration ethanol to Co2 during the dewaxing filtration. The delta P comes into play also, the JT cooling of the CXE mixture is responsible for the rapid percipitation of waxes. Having a higher pressure vessel to expand lower pressure vessel using a needle valve can cool the CXE solvent mixture to below -20f in seconds.
The ethanol at this point is no longer a modifier but a process solvent and the co2 left in the CXE mixture is a antisolvent.