Measurement and correlation of vapor-liquid equilibria of binary systems containing the ionic liquids [EMIM] [(CF3SO2)2N], [BMIM] [(CF3SO2)2N], [MMIM] [(CH3)2PO4] and oxygenated organic compounds respectively water

Vapor-liquid equilibria (VLE) have been measured for methanol, ethanol, 2-propanol, acetone, tetrahydrofuran (THF) and water with the ionic liquids 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [EMIM][(CF3SO2)(2)N], 1-butyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [BMIM][(CF3SO2)(2)N], 1-methyl-3-methyl-imidazolium dimethylphosphate [MMIM][(CH3)(2)PO4] at 353.15 K with the help of a computer-driven static apparatus. For water a miscibility gap was observed with [EMIM][(CF3SO2)(2)N] and [BMIM] [(CF3SO2)(2)N] at 353.15 K, for the oxygenated compounds (acetone, alcohols and THF) homogeneous behavior was obtained. While for TUF positive deviation from Raoult's law was observed, very small activity coefficients at infinite dilution gamma(infinity)(i) were observed for water and alcohols with [MMIM][(CH3)(2)PO4]. The experimental VLE data were correlated using the UNIQUAC model. The relative mean deviations between the measured and predicted pressures obtained using the UNIQUAC model are 4.7%. (c) 2005 Elsevier B.V. All rights reserved.