Briefly, in the SFE unit (in-house built equipment), the liquid CO2 (food grade) is
delivered from a standard cylinder, cooled (≈273 K), and
compressed with a high-pressure pump (air-driven piston
pump, model M71, Haskel) to an extraction pressure of
14 MPa. Compressed CO2 is heated up to 40 °C through a
stainless steel coil and enters the extraction cell containing the
plant material which is placed inside an oven with ventilation
and temperature control. This extractor was built from stainless
steel as well and has a capacity for 1 L of sample material.