Vapor plus 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 318.2 K

Isothermal vapor liquid equilibria (VLE) For the binary systems of difluoro methane (HFC-32)+1,1.1,2,3,3-hexafluoropropane (HFC-236ea) and pentafluoroe thane (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 m easured by gas chromatography, based on calibration using gravimetrically p repared mixtures. Both systems show a slight deviation from Raoult's law. T he uncertainties in pressure, temperature, and vapor- and liquid-phase comp osition measurements were estimated to be no more than +/- 1 kPa, +/- 0.02 K, and +/-0.002 mol fraction, respectively. The data were analyzed using th e Carnahan-Starling-DeSantis equation of stare.