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Vapor−Liquid Equilibrium Data for the Binary Mixture Difluoroethane (HFC-32) + Pentafluoroethane (HFC-125) of an Alternative Refrigerant

Xiaohong Han, Guangming Chen, Xiaolong Cui, Qin Wang

Abstract

Isothermal vapor−liquid equilibrium data for the binary system difluoroethane (HFC-32) + pentafluoroethane (HFC-125) were measured at temperatures from (265.15 to 303.15) K by the circulating method in this work. The vapor−liquid equilibrium data were correlated by the Peng−Robinson equation of state combined with a linear combination of the Vidal and Michelsen mixing rule and nonrandom two-liquid model. The results reveal that the correlated data are in a good agreement with the experimental values.

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Key concepts: Chemistry, Refrigerant, Isothermal process, Vapor–liquid equilibrium, Thermodynamics, Binary number, Fluorocarbon, Equation of state