Solubility measurement, modeling and mixing thermodynamic properties of R1243zf and R600a in [BMIM][Ac]

Abstract 3,3,3-Trifluoropropene (R1243zf) and isobutane (R600a) are considered as prominent environmentally-friendly refrigerants, and acetate-based ionic liquids are potential absorbents used in absorption refrigeration cycles. In this work, the dissolving capacities of R1243zf and R600a in one of the acetate-based ionic liquids (1-butyl-3-methylimidazolium acetate, [BMIM][Ac]) were investigated. The measurements were based on isochoric saturation method and the experimental temperature range was from 283.15 K to 343.15 K. The non-random two liquid (NRTL) model and Krichevsky-Kasarnovsky (K-K) model were utilized to model the experimental results, and both models exhibited reasonable deviations. On the basis of solubility data and correlation results, the Henry’s law constants and the mixing thermodynamic properties (mixing enthalpy, mixing entropy and Gibbs energy) for the two mixtures were determined. In addition, the dissolving abilities of R1243zf and R600a in [BMIM][Ac] were compared with the reported results of R1234yf in the literature.