Water is an extremely poor solvent for terpenes and supercritical water is highly reactive. Not only would you extract a lot of undesirable material from the plant, you would also chemically modify much of the target compounds. This already one of t…
I run around 750psi with a water cooled condenser at 4C and can get about as much terpene yield as anyone would want. It's all about the system you're using and how you recover the extract when depressurizing.
Sub-critical CO2 extraction. We've successfully used it for extraction of fennel, sandalwood, cinnamon. yarrow and even frankincense. The yields are higher than other techniques and there is little or no breakdown of the alkaloids and the higher MW …