Phase equilibria of CFC alternative refrigerant mixtures: Binary systems of isobutane+1,1,1,2-tetrafluoroethane,+1,1-difluorethane, and plus difluoromethane

Abstract

Isothermal vapor-liquid equilibria were measured in the binary systems 1,1,1,2-tetrafluoroethane + isobutane at 303.2 and 323.2 K, 1,1-difluoroethane + isobutane at 303.2, 313.2, 323.2;, and 333.2 K, and difluoromethane + isobutane at 301.8 and 321.8 K in a circulation-type equilibrium apparatus. The experimental data were well. correlated with the Peng-Robinson equation of state using the Wong and Sandler mixing rules.