MEDELING OF SOLID SOLUBILITY IN SUPERCRITICAL CARBON DIOXIDE USING PC-SAFT EOS

Development of the supercritical fluid extraction process depends on the ability to model the solubility of the solutes in the supercritical solvents. In this paper, PC-SAFT equation of state is used for thermodynamic modeling of the solubility of various solid components in the supercritical carbon dioxide. In this study, the solubilities of benzoic acid, 2-naphthol, acridine, 1,4-naphthoquinone and 2-aminofluorene in supercritical carbon dioxide were calculated at different ranges of temperatures and pressures using PC-SAFT equation of state. The results showed that the average absolute relative deviation percent (AAD%) for solubility predictions of benzoic acid, 2-naphthol, acridine, 1,4-naphthoquinone and 2-aminofluorene were 3.2, 2.28, 2.5, 2.96 and 2.39, respectively. Therefore, the PC-SAFT equation of state can be used to calculate the solubility of these solids in the supercritical fluids in the way of good accuracy.