Determination of Activity Coefficients at Infinite Dilution of Solutes in the Ionic Liquid, Trihexyltetradecylphosphonium Bis(trifluoromethylsulfonyl) Imide, Using Gas−Liquid Chromatography at <i>T</i> = (303.15, 308.15, 313.15, and 318.15) K

Abstract

The activity coefficients at infinite dilution, γ13∞, for hydrocarbon solutes and some alcohols in the ionic liquid trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide [3C6C14P][Tf2N] have been determined by gas−liquid chromatography at temperatures T = (303.15, 308.15, 313.15, and 318.15) K. The selectivity values have been calculated at T = 308.15 K, and the results indicate that the ionic liquid [3C6C14P][Tf2N] should not be considered as a solvent for separation of alkanes and aromatics. The partial molar excess enthalpy values at infinite dilution ΔH1E∞, determined in this work, together with the values γ13∞ have been discussed in terms of intermolecular interactions and compared to results of related systems obtained from the literature.