Vapor+Liquid Equilibrium Measurements and Correlation of the Binary Refrigerant Mixtures Difluoromethane (HFC-32)+1,1,1,2,3,3-Hexafluoropropane (HFC-236ea) and Pentafluoroethane (HFC-125)+1,1,1,2,3,3-Hexafluoropropane (HFC-236ea) at 288.6, 303.2, and 318.

Isothermal vapor liquid equilibria (VLE) for the binary systems of difluoro- methane (HFC-32)+1,1,1,2,3,3-hexafluoropropane (HFC-236ea) and penta- fluoroethane (HFC-125)+1,1,1,2,3,3-hexafluoropropane (HFC-236ea) were measured at 288.6, 303.2, and 318.2 K using an apparatus in which the vapor phase was recirculated through the liquid. The phase composition at equilibrium was measured by gas chromatography, based on calibration using gravimetri- cally prepared mixtures. Both systems show a slight deviation from Raoultʹs law. The uncertainties in pressure, temperature, and vapor- and liquid-phase com- position measurements were estimated to be no more than \1 kPa, \0.02 K, and \0.002 mol fraction, respectively. The data were analyzed using the Carnahan Starling DeSantis equation of state.