Abstract
Three complementary correlations capable of modelling binary SCF equilibrium data have been examined. The results of this study have shown that neither the purely empirical semi-log correlation of enhancement factor with solvent density nor the theoretical log-log relationship between the solute concentration and solvent density predicted experimental solubility data satisfactorily over a wide range of SCF conditions. The above mentioned correlations were suitable for nonpolar solutes where distinct “fine splitting” of the solubility isotherms was observed. These simple relationships break down as the solute polarity increases, indicating that the solute-solute and solute-solvent interactions such as hydrogen bonding, acid-base, and dipole-dipole interactions need to be considered. The semi-empirical semi-log correlation of Ziger and Eckert appeared to provide a distinct advance in handling of data for both the nonpolar and polar compounds studied.
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