Modified Redlich-Kwong and Peng-Robinson Equations of State for Solubility Calculation of Solid Compounds in Supercritical Carbon dioxide

Abstract

The modified Redlich-Kwong (βRK) and modified Peng-Robinson (βPR) Equations of State (EoSs) combined with the van der Waals mixing rule (vdW0) have been proposed to evaluate the solubilities of ten solid compounds in supercritical CO 2 . These ten solid compounds are including Methimazole, Ascorbic acid, Ascorbyl palmitate, Propyl gallate, Aspirin, Fluoranthene, Triclocarban, Hinokitiol, Phenol, and Climbazole. In order to recognize the accuracy of the proposed EoSs, the results of these models have been compared with the calculation results of SRK and PR equations of state in combination with the vdW1 and the Wong-Sandler (WS) mixing rules and other models reported in the literature. The results showed that the proposed models are well for solubility calculation of these ten solid compounds in supercritical CO 2 and the RK EoS in combination with the vdW0 mixing rule led to better correlation (AARD = 5.1%) compared with other ones.