Correlation of solid solubility of 1‐hydroxy‐9,10‐anthraquinone derivatives in supercritical carbon dioxide

Abstract

In this study, the solid solubilities of four 1-hydroxy-9,10-anthraquinone derivatives (HAQs) in supercritical carbon dioxide (CO 2 ) have been correlated using a two solid-dependent parameter solution model developed from the regular solution model coupled with the Flory-Huggins equation. The correlated results show satisfactory agreement with the experimental data. In addition, with appropriate model simplification and generalization, a generalized solution model is proposed in this study to predict the solubility behavior of HAQs in supercritical CO 2 . By applying our generalized solution model, satisfactory calculated results are obtained and the average deviation of predicted solubilities is only about 10%.