Fig. (2) Initial state of SFE pilot-scale unit. (1) CO₂ cylinder, (2) blocking valve, (2’) safety valve, (3) line filter, (4) manometer, (4’) internal temperature indicator, (4”) external temperature indicator, (5) heat exchanger with coiled tube for CO₂ cooling, (6) mass flow meter, (7) CO₂ pump, (7’) cosolvent pump, (8) heat exchanger for CO₂ heating, (9) three-way valve, (10) extraction column, (11) automated backpressure valve, (11’) manual backpressure valve, (12) separation vessel.