Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Vapor.liquid equilibria (VLE) for the binary systems methylcyclohexane.toluene and 1-octene.noctane and the ternary systems with the ionic liquid 1-hexyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl) imide [HMIM]+[BTI]. as entrainer were measured. The addition of the ionic liquid leads to an increase of the separation factors. Excess enthalpies (HE) were measured for methylcyclohexane and n-octane in the same ionic liquid as well. Furthermore activity coefficients at infinite dilution ( ) 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]+[EtOSO3].. The -values were used to determine the selectivities S ij = i / j and the capacities ki = 1/ i at infinite dilution. The experimental data with [R1R2IM]+[BTI]. were compared with the predicted results using mod. UNIFAC (Do). The predicted results are in good agreement with the experimental data.