Determination of Anthraquinone Violet 3RN solubility in supercritical carbon dioxide with/without co-solvent: Experimental data and modeling (empirical and thermodynamic models)

Abstract

In this study, the solubility of Anthraquinone Violet 3RN (AV3RN) was measured in supercritical CO2 with/without methanol as co-solvent at different temperature (308, 318, 328 and 338)K and pressures up to 34.0MPa. The solubility of AV3RN varied in the range of 0.047×10−5 to 0.546×10−5mole fractions while its solubility by co-solvent ranged from 0.44×10−5 to 5.77×10−5mole fractions. Calculated enhanced solubility factors are in the range of 7.7–15.9 by addition of 6% mole methanol as co-solvent. For both studied systems, AV3RN solubility was correlated with several density-based models and equations of state (EoSs) including Peng–Robinson (PR) and Soave–Redlich–Kwong (SRK). Empirical models developed by Khansary et al. along with Garlapati–Madras models in binary system, and the Jouyban et al. model in ternary system exhibited the highest accordance with experimental data. Also it was shown that, the PR model performed better in predicting the solubility of AV3RN when compared with SRK.