From Patent: WO 2005073154 A1
THE SOLVENT R134A:
1. "The solvent power of the fluid is directly related to the density at fixed temperature, and temperature at fixed density.
2. In the near-critical region, the density of the fluid is high and the fluid can act as a solvent.
3. When the...
This should help.
1. Compressor Pump (in this case a really expensive explosion proof one)
2. Reservoir (this has both gas and liquid ports and a dip tube)
3. Extraction vessel (put the herb in here, liquid flows through it. note the sight glass)
4. Molecular sieve (removes water)
5. Expansion...