Thermodynamics and activity coefficients at infinite dilution measurements for organic solutes and water in the ionic liquid 1-butyl-1-methylpyrrolidinium tetracyanoborate

Highlights: → Measurements of activity coefficients at infinite dilution using GLC. → Forty-five solvents in the IL 1-butyl-1-methylpyrrolidinium tetracyanoborate, [BMPYR][TCB]. → Possible entrainer for different separation processes. → The gas-liquid partition coefficients, KL were calculated. → The Abraham solvation parameter model was discussed. - Abstract: The activity coefficients at infinite dilution, γ13∞, for 45 solutes, including alkanes, cycloalkanes, alkenes, alkynes, aromatic hydrocarbons, alcohols, thiophene, tetrahydrofuran, ethers, acetone, and water, in the ionic liquid 1-butyl-1-methylpyrrolidinium tetracyanoborate, [BMPYR][TCB], were determined by gas-liquid chromatography at temperatures from 318.15 K to 368.15 K. The values of the partial molar excess Gibbs free energy ΔG1E,∞, enthalpy ΔH1E,∞, and entropy ΔS1E,∞ at infinite dilution were calculated from the experimental γ13∞ values obtained over the temperature range. The gas-liquid partition coefficients, KL were calculated for all solutes and the Abraham solvation parameter model was discussed. The values of the selectivity for different separation problems were calculated from γ13∞ and compared to literature values for N-methyl-2-pyrrolidinone (NMP), sulfolane, 1-ethyl-3-methylimidazolium tetracyanoborate, [EMIM][TCB], 1-decyl-3-methylimidazolium tetracyanoborate, [DMIM][TCB], and similar ionic liquids. The densities of [BMPYR][TCB] in temperatures range from 318.15 K to 368.15 K, the temperature of fusion and the enthalpy of fusion were measured.