Phase Equilibria of HFC Mixtures: Binary Mixtures of Trifluoromethane + 1,1-Difluoroethane and Trifluoromethane + 1,1,1-Trifluoroethane at 283.15 and 293.15 K

摘要

Isothermal vapor-liquid equilibria for the binary mixtures of trifluoromethane (R-23) + 1,1-difluoroethane (HFC-152a) and trifluoromethane + 1,1,1-trifluoroethane (HFC-143a) were measured at 283.15 and 293.15 K. The experiments were carried out witha 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 equationof state using the Wong andSandler mixing rules and the Carnahan-Starling-Desantis(CSD) equation of state. Calculated results with these equations showed good agreement witht he experimental data, but the Peng-Robinson equation of state gave more accurate predictions for the binary systems.Azeotropic behavior has not been found in either of these mixtures.