Optimal operating time set for the separation process fell to 60 min at 40 MPa. Increase in the S values at 40 MPa has an average of 5.8–fold and varied between varied between 6.2–9.7 g/L.Compared to the process of scCO2 extraction of RHSO, increase in the values of RExtand S varied between 1.5–2.5 fold depending on CEtOH when ethanol was used as the entrainer. Although there was no significant difference between the density of scCO2 and the densities of scCO2+ ethanol mixtures, RExt increased about 2.5–fold when ethanol was used in the concentration of 5%vol.