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Solubility and Excess Molar Properties of 1,3-Dimethylimidazolium Methylsulfate, or 1-Butyl-3-Methylimidazolium Methylsulfate, or 1-Butyl-3-Methylimidazolium Octylsulfate Ionic Liquids with n-Alkanes and Alcohols: Analysis in Terms of the PFP and FBT Models1

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Abstract

The solubility of 1-butyl-3-methylimidazolium octylsulfate, [BMIM][OcSO4], has been determined in hydrocarbon (n-hexane, n-heptane, n-octane or n-decane) solutions and alcohol (methanol, 1-butanol, 1-hexanol, 1-octanol or 1-decanol) solutions. Densities and excess molar volumes, V E m, have been determined for 1-methyl-3-methylimidazolium methylsulfate, [MMIM][CH3SO4], solutions with an alcohol (methanol, ethanol or 1-butanol) and with water; for 1-butyl-3-methylimidazolium methylsulfate, [BMIM][CH3SO4], with an alcohol (methanol, ethanol, 1-butanol, 1-hexanol, 1-octanol or 1-decanol) and with water; and for 1-butyl-3-methylimidazolium octylsulfate, [BMIM][OcSO4], with an alcohol (methanol, 1-butanol, 1-hexanol, 1-octanol or 1-decanol) at 298.15 K and atmospheric pressure. The systems exhibit very negative or positive molar excess volumes, V E m, and negative or positive excess molar enthalpies, H E m, as predicted by the Flory–Benson–Treszczanowicz (FBT) model. Our experimental V E m data were used for the description of H E m for solutions of [MMIM][CH3SO4] with the alcohols under study. The simple Prigogine–Flory–Paterson (PFP) model, without including the association of the alcohol, gave slightly worse results. Negative molar excess volumes, V E m, are attributed to hydrogen bonding between the short chain alcohols and ionic liquid and to efficient packing effects. The FBT model overestimates self-association of the alcohol in the solutions under study and shifts the calculated curves to higher alcohol mole fractions. The thermophysical characteristics of [BMIM][OcSO4] were also examined by differential scanning calorimetry (DSC).

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  1. Physical Chemistry Division, Faculty of Chemistry, Warsaw University of Technology, Warsaw, 00-664, Poland

    U. Domańska, A. Pobudkowska & A. Wiśniewska

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  1. U. Domańska
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  2. A. Pobudkowska
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Correspondence to U. Domańska.

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Presented at the 21st ESAT European Symposium on Applied Thermodynamics, Jurata, Poland, June 1, 2006 to June 5, 2006.

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Domańska, U., Pobudkowska, A. & Wiśniewska, A. Solubility and Excess Molar Properties of 1,3-Dimethylimidazolium Methylsulfate, or 1-Butyl-3-Methylimidazolium Methylsulfate, or 1-Butyl-3-Methylimidazolium Octylsulfate Ionic Liquids with n-Alkanes and Alcohols: Analysis in Terms of the PFP and FBT Models1 . J Solution Chem 35, 311–334 (2006). https://doi.org/10.1007/s10953-005-9002-0

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