Solubilities of some 9,10-anthraquinone derivatives in supercritical carbon dioxide: A cubic equation of state correlation

The solubilities of some 9,10-anthraquinone derivatives in supercritical carbon dioxide were measured at 308, 318, 328, 338 and 348 K over the pressure range from 15.2 to 35.5 MPa, using a simple static method. The solubilities were found to be in the range 8.1 × 10−6 and 5.8 × 10−4 mole fractions. The experimental results were correlated by the Peng–Robinson equation of state (PR-EOS) with the one and two adjustable parameter conventional mixing rules. The physical properties of pure components, critical temperatures and pressures and sublimation pressures were estimated using the group contribution methods. The proposed model was able to correlate the experimental solubility data with good agreement by adjusting binary interaction parameters kij and lij. Deviations of calculated results from experimental data were presented as averaged absolute relative deviation percentage, AARD (%), the values of which being in the range of 3.9–13.9%.