Phase equilibria of chlorofluorocarbon alternative refrigerant mixtures. Binary systems of trifluoromethane plus isobutane at 283.15 and 293.15 K and 1,1,1-trifluoroethane plus isobutane at 323.15 and 333.15 K

Abstract

Isothermal vapor-liquid equilibrium data of the binary mixtures of trifluoromethane (HFC-23) + isobutane (R600a) and 1,1,1-trifluoroethane (HEC-143a) + isobutane have been measured at 283.15 and 293.15 K and at 323.15 and 333.15 K, respectively. The experiment was carried out with a circulation-type equilibrium apparatus with the measurement of temperature, pressure, and the compositions of the liquid and vapor phases. The experimental data were correlated with the Peng-Robinson equation of state using the Wong and Sandler mixing rules.