ESTIMATION OF SOLUBILITY OF SOLIDS IN SUPERCRITICAL CARBON DIOXIDE

摘要

Peng-Robinson equation of state (PR EOS) .was chosen for modeling the thermodynamic be- havior of supercritical (SC)-CO_2/Solid systems. The necessary critical constants and acentric factor of the solute were obtained by the Sigmund and Trebble(1992)method based on the molecular weight and boiling temperature, and the vapor pressure of the solute was calculated by its melting temperature and heat of fusion. This approach compared very favorably with the conventional corres- ponding state theory, but without using critical constants and vapor pressure of solutes. Four mixing rules were tested for the calculation of solid solubility in SC-CO_2van der Waals(vdW) mixing rule with one parameter was considered to be most suitable for the estimation of solubility.