Abstract
Studies of the extraction of solid mixtures with supercritical fluids (SCFs) demonstrate that solute−solute interactions in the SCF phase can be significant. To further explore such interactions, the solubilities of various mixtures of hydroxybenzoic acid (HBA) isomers in supercritical CO2 were determined. Solubility data are reported at pressures ranging from 101 to 203 bar and for temperatures of 318 K and 328 K. Significant solubility enhancements were observed for m-HBA and p-HBA in systems containing the ortho isomer. The degree of solubility enhancement obtained is possibly the result of hydrogen bonding between the isomers in the SCF phase. The solubility data were correlated with a modified form of the Peng−Robinson equation of state.
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