Fig. (1) SFE bench-scale unit. (1) CO₂ cylinder, (2) blocking valve, (2’) safety valve, (3) line filter, (3’) air filter, (4) cooling bath, (5) compressor, (6) air pressure regulator, (7) air-driven fluid pump, (8) manometer, (8’) temperature indicator, (9) blow motor, (10) blow motor resistor, (11) extraction column, (12) oven module, (13) micrometric valve with heating system, (14) collection flask, (15) flow meter, (16) flow totalizer.