Abstract
Vapour–liquid equilibria (VLE) of binary mixtures of n-perfluorohexane plus a n-alkane (C 5–C 8) and of n-hexane plus a n-perfluoroalkane (C 5–C 8) were determined using a head-space gas-chromatographic technique. Excess molar Gibbs energies, G E, for the systems investigated have been obtained by a least-square treatment of equilibrium data. Liquid–liquid equilibria (LLE) were determined by turbidimetry for n-perfluorohexane+ n-C n H 2 n+2 ( n=6–8) mixtures and the observed T– x curves compared with those predicted by the temperature dependence of activity coefficients. All mixtures show strong positive deviations from ideality, which increase with the size of the second component. Solute–solvent and solute–solute interactions have been examined by calculating and discussing solvation Gibbs energies and Kirkwood–Buff integrals. Perfluoroalkanes proved to be inert molecules that interact weakly with themselves as well as with alkanes.
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