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Issue
Korean Journal of Chemical Engineering,
Vol.19, No.1, 146-152, 2002
Distribution of Solutes Between Polymer and Supercritical Fluid by Inverse Supercritical Fluid Chromatography
Shim JJ
Two methods of inverse supercritical fluid chromatography (ISFC), frontal analysis supercritical fluid chromatography (SFC) and elution SFC, have been compared for the determination of distribution coefficients of solutes between a polymer and a supercritical CO2. The logarithm of the distribution coefficient showed monotonic decrease with the density of the supercritical fluid (SF). The abnormal-maximum behavior of solute sorption in the polymer phase was explained by the fluid and solute properties, f2P/P2 sat. Interesting open-elliptic shapes of sorption and volumefraction curves were obtained and explained with the fugacity coefficient. Correction to the capacity factor was employed to eliminate the retention due to the adsorption on the surface of the silica support. A model based on the Flory equation and the Peng-Robinson equation of state (EOS) successfully predicted the phase behavior of the ternary solutesupercritical fluid-polymer systems using only interaction parameters obtained from the binary systems. The solute distribution coefficient at infinite dilution was used to calculate the phase equilibrium at finite concentration using a ternary-phase diagram.
Keywords: Distribution Coefficient; Supercritical Fluid; Polymer; Solute; Sorption; Supercritical Fluid Chromatography; Phase Equilibrium
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