Vapor–Liquid Equilibria of CFC Alternative Refrigerant Mixtures: Trifluoromethane (HFC-23)+Difluoromethane (HFC-32), Trifluoromethane (HFC-23)+Pentafluoroethane (HFC-125), and Pentafluoroethane (HFC-125)+1,1-Difluoroethane (HFC-152a)

Isothermal vapor liquid equilibria for three binary mixtures of CFC alternative refrigerants were determined in an equilibrium apparatus in which both phases were continuously recirculated. The pressures and vapor and liquid composi- tions were measured for the binary systems trifluoromethane (HFC-23)+ difluoromethane (HFC-32) and trifluoromethane (HFC-23)+pentafluoro- ethane (HFC-125) at 283.15 and 293.15 K and pentafluoroethane (HFC-125)+ 1,1-difluoroethane (HFC-152a) at 293.15 K. The experimental data were correlated with the Peng Robinson Stryjek Vera equation of state using the Huron Vidal original mixing rule. Calculated results with this equation showed good agreement with the experimental data.