Correlation of Solubilities of High Boiling Compounds in Supercritical Fluids Using Perturbed-Hard-Sphere Equation of State

Abstract

A perturbed-hard-sphere equation of state (PHS-EOS) was applied to correlate the solubilities of high boiling compounds such as coal liquefaction products in supercritical fluids. A suitable mixing rule for the constants contained in the PHS-EOS is needed to apply the equation of state to a mixture composed of high boiling compound and supercritical fluid. In this study, mixing rules for the constants were examined and discussed. It was found that a local composition mixing rule with three characteristic parameters introduced into both molecular attraction and molecular size terms gives a good result because the solubility is quite small near infinite dilution.