Measurements of the solubility parameter and enthalpies of vaporization in N-alkyl-pyridinium bis((trifluoromethyl)sulfonyl)imide ([CnPY][NTF2], n = 4,6,8) ionic liquid

• DOI: 10.1016/j.fluid.2018.12.014
• Publication Date: 2018-12-11T08:49:34Z
• Authors: Tao Ban; Xiao-Ping Li; Cai-Lian Li; Qiang Wang
• Keywords: Sulfonyl; Hildebrand solubility parameter; Imide; Inverse gas chromatography; Vaporization

Abstract Some thermodynamic and physicochemical properties of N-alkyl-pyridinium bis((trifluoromethyl)sulfonyl)imide ([CnPY][NTF2], n = 4, 6, 8) ionic liquids (ILs) were investigated through inverse gas chromatography at temperatures from 333.15 K to 373.15 K. A total of 23 solvents were used to compute the specific retention volume and Flory–Huggins interaction parameters. The Hildebrand solubility parameters of three ILs were calculated based on the solubility parameters of probe solvents. In addition, the enthalpy values of vaporization of the ILs were obtained based on the Hildebrand solubility parameters.