Measurements of activity coefficients at infinite dilution for organic solutes and water in the ionic liquid 1-butyl-1-methylpyrrolidinium tricyanomethanide

• Published in: The Journal of chemical thermodynamics 2013-11, Vol.66, p.144-150
• Main Authors: Domańska, Urszula, Lukoshko, Elena Vadimovna
• Format: Article
• Language: English
• Subjects: Activity coefficients; Activity coefficients at infinite dilution; Aliphatic hydrocarbons; Benzene; Density; Dilution; Gas–liquid partition coefficients; Ionic liquid, [BMPYR][TCM]; Ionic liquids; Mathematical analysis; Separation; Separation selectivity and capacity; Thermodynamic properties at infinite dilution; Thiophenes
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2013.07.004

[Display omitted] •Measurements of activity coefficients at infinite dilution using GLC.•62 organic solvents and water in the ionic liquid 1-butyl-1-methylpyrrolidinium tricyanomethanide.•High capacity for thiophene, 1.37 at T=328.15K.•Possible entrainer for extraction of sulfur, or nitrogen compounds from fuels.•The excess thermodynamic functions and the gas–liquid partition coefficients were calculated. The activity coefficients at infinite dilution, γ13∞, for 62 solutes, including alkanes, cycloalkanes, alkenes, alkynes, aromatic hydrocarbons, alcohols, water, thiophene, ethers, ketones, acetonitrile, pyridine and 1-nitropropane in the ionic liquid 1-butyl-1-methylpyrrolidinium tricyanomethanide, [BMPYR][TCM] were determined by gas–liquid chromatography at six temperatures over the range of (318.15 to 368.15)K. The partial molar excess Gibbs free energy, ΔG1E∞, enthalpy ΔH1E∞, and entropy term TrefΔS1E,∞ at infinite dilution were calculated from the experimental γ13∞ values obtained over the temperature range. The densities of [BMPYR][TCM] were measured within temperature range from 318.15K to 368.15K. The gas–liquid partition coefficients, KL were calculated for all solutes. The values of selectivity for few separation problems as hexane/benzene, cyclohexane/benzene, heptane/thiophene were calculated from γ13∞ and compared to literature values for N-methyl-2-pyrrolidinone (NMP), sulfolane, and other ionic liquids based on [BMPYR]+ cation. In comparison with the former measured ILs, [BMPYR][TCM] present quite high selectivity for the separation of aromatic hydrocarbons and aliphatics hydrocarbons, an average capacity for benzene. The data presented here shows that [BMPYR][TCM] ionic liquid can be used as an alternative solvent for the separation of thiophene from the aliphatic hydrocarbons.