Thermodynamic properties of mixtures containing ionic liquids: Activity coefficients of aldehydes and ketones in 1-methyl-3-ethyl-imidazolium bis(trifluoromethyl-sulfonyl) imide using the transpiration method

Abstract

Vapor–liquid equilibria (VLE) of binary mixtures containing the high boiling solutes: nonan-1-al, 4-methyl-benzaldehyde, nonan-2-one, and 4-phenylbutan-2-one and the ionic liquid (IL) [EMIM][NTf 2] were studied by using the transpiration method. VLE measurements were carried out over the whole concentration range at different temperatures between 298 and 323 K. Activity coefficients γ i of these solvents in the ionic liquid have been determined from these data using the NRTL-equation. In addition vapor pressures of the pure solutes 4-methyl-benzaldehyde, nonan-2-one and 4-phenylbutan-2-one have been measured as function of temperature and their enthalpies of vaporization have been obtained.