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Phase equilibria of imidazolium ionic liquids and the refrigerant gas, 1,1,1,2-tetrafluoroethane (R-134a)
Authors:Wei Ren  Aaron M Scurto
Institution:Department of Chemical & Petroleum Engineering and NSF-ERC Center for Environmentally Beneficial Catalysis, University of Kansas, Lawrence, KS 66045, USA
Abstract:A number of applications with ionic liquids (ILs) and hydrofluorocarbon gases have recently been proposed. Detailed phase equilibria and modeling are needed for their further development. In this work, vapor–liquid equilibrium, vapor–liquid–liquid equilibrium, and mixture critical points of imidazolium ionic liquids with the hydrofluorocarbon refrigerant gas, 1,1,1,2-tetrafluoroethane (R-134a) was measured at temperatures of 25 °C, 50 °C, 75 °C and pressure up to 143 bar. The ionic liquids include 1-hexyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)amide (HMIm]Tf2N]), 1-hexyl-3-methyl-imidazolium hexafluorophosphate (HMIm]PF6]), and 1-hexyl-3-methyl-imidazolium tetrafluoroborate (HMIm]BF4]). The effects of the anion and cation on the solubility were investigated with the anion having greatest impact. HMIm]Tf2N] demonstrated the highest solubility of R-134a. The volume expansion and molar volume were also measured for the ILs and R-134a. The Peng–Robinson Equation of State with van der Waals 2-parameter mixing rule with estimated IL critical points were employed to model and correlate the experimental data. The models predict the vapor–liquid equilibrium and vapor–liquid–liquid equilibrium pressure very well. However, the mixture critical points predictions are consistently lower than experimental values.
Keywords:Imidazolium ionic liquids  Mixture critical points  1  1  1  2-Tetrafluoroethane (R-134a)  Vapor&ndash  liquid equilibrium  Vapor&ndash  liquid&ndash  liquid equilibrium
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