Activity coefficients at infinite dilution γ i∞ of solutes such as alkanes, alkenes, and alkylbenzenes as well as of the linear and branched C 1 -C 6 alcohols, esters, and aldehydes in the ionic liquids trimethyl-butylammonium bis(trifluoromethylsulfonyl) imide [Me 3 BuN][NTf 2 ] have been determined by gas chromatography using the ionic liquids as stationary phase. The measurements were carried out at different temperatures between 302 K and 393 K. From the temperature dependence of the limiting activity coefficients, partial molar excess enthalpies at infinite dilution H i E,∞ of the solutes in the ionic liquids have been derived. Vapor-liquid equilibria (VLE) of binary mixtures containing methanol, ethanol, and propan-1-ol in [Me 3 BuN][NTf 2 ] were studied by using a static method. VLE measurements were carried out covering the whole concentration range at four different temperatures between 298.15 K and 313.15 K. Activity coefficients γ i of solutes in the ionic liquid and their osmotic coefficients φ i in the [Me 3 BuN][NTf 2 ] have been determined from the VLE data and are described formally by using the NRTL equation. γ i ∞ and H i E,∞ for methanol, ethanol, and propan-1-ol in [Me 3 BuN][NTf 2 ] are derived from the both the GC and the static method.

Vapor−liquid equilibria (VLE) of binary mixtures containing methanol, ethanol, propanol-1, and benzene in the ionic liquid [BMIM][OctS] or [OMIM][BF4] were studied by using a static method. VLE measurements were carried out over the whole concentration range at four different temperatures in the range from 298.15 K to 313.15 K. Activity coefficients γ i of these solvents in the ionic liquids and osmotic coefficients φ i of the ionic liquids have been determined from the VLE data and are described formally by using the NRTL equation.

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