Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

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 to 21.0 MPa. The experimental data in binary system were correlated with eight semi-empirical equations. The calculated result shows that the equations proposed by Adachi and Lu (A-L) and modified K-J equation provide better correlation than others. The AARD (%) for A-L and modified K-J equations is 5.53 and 5.84 respectively. The thermodynamic properties (total enthalpy AH, sublimation enthalpy AHsub. and solvation enthalpy AHsolv.) of solid solute were obtained. The cosolvent investigated in this work is 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 to 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.