Solubilities of benzene sulfonamide in supercritical CO2 in the absence and presence of cosolvent

Solubilities of benzene sulfonamide in supercritical CO2 were measured by using dynamic method at temperature ranging from 308.15 to 328.15 K over a pressure range of 11.0–21.0 MPa. The experimental data in binary system were correlated with eight semi-empirical equations. The calculated result shows that the equation proposed by Adachi and Lu (A–L) provides the best correlation to the experimental data. The AARD (%) for A–L equation is 5.53. The thermodynamic properties (total enthalpy ΔH, sublimation enthalpy ΔHsub. and solvation enthalpy ΔHsolv.) of solid solute were obtained. The cosolvent investigated in this work was ethanol, ethylene glycol and ethyl acetate, respectively. The solubilities in ternary system were determined with molar fraction of 3.5% (cosolvent) at 308.15 K over a pressure range of 11.0–21.0 MPa. The enhancement factor of each cosolvent was calculated. The experimental data in ternary system were correlated by using T–G equation and modified Sovova equation.