Abstract
Vapor–liquid equilibria (VLE) for the binary systems methylcyclohexane–toluene and 1-octene– n-octane and the ternary systems with the ionic liquid 1-hexyl-3-methyl-imidazolium bis(trifluoro-methylsulfonyl)imide [HMIM] +[BTI] − as entrainer were measured. The addition of the ionic liquid leads to an increase of the separation factors. Excess enthalpies ( H E) were measured for methylcyclohexane and n-octane in the same ionic liquid as well. Furthermore activity coefficients at infinite dilution ( γ ∞) were determined for a few solutes in various ionic liquids such as 1-hexyl-3-methyl-imidazolium bis(trifluoro-methylsulfonyl)imide [HMIM] +[BTI] −, 1-hexyl-3-methyl-imidazolium trifluoro-methanesulfonate [HMIM] +[OTF] −, 1-methyl-1-octyl-pyrrolidinium bis(trifluoromethyl-sulfonyl)imide [MOPYR] +[BTI] −, 1-methyl-1-butyl-pyrrolidinium trifluoromethanesulfonate [MBPYR] + [OTF] − and 1-ethyl-3-methyl-imidazolium ethyl sulfate [EMIM] +[EtOSO 3] −. The γ ∞-values were used to determine the selectivities S i j ∞ = γ i ∞ / γ j ∞ and the capacities k i = 1 / γ i ∞ at infinite dilution. The experimental data with [R 1R 2IM] +[BTI] − were compared with the predicted results using mod. UNIFAC (Do). The predicted results are in good agreement with the experimental data.
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