Vapor phase and two-phase PvTz measurements of difluoromethane + 2,3,3,3-tetrafluoroprop-1-ene

This paper provides 217 PvTz points for the binary systems of difluoromethane (R32) and 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) both in the two-phase and superheated vapor regions. The R32 + R1234yf data were measured along eleven isochores (0.029794, 0.029936, 0.030724, 0.032113, 0.061323, 0.063915, 0.102150, 0.111536, 0.116592, 0.144796, 0.280627) m3·kg−1 for temperatures from (263 to 383) K for eleven R32 mole fractions (0.1214, 0.1330, 0.1792, 0.2712, 0.3432, 0.5229, 0.6231, 0.6489, 0.7020, 0.8122, 0.9460). From the measurements in the two-phase region, the vapor-liquid equilibrium behavior of the studied binary systems was derived by applying the flash method with the Carnahan–Starling–De Santis equation of state, the Peng–Robinson equation of state and a two-parameter cubic equation of state proposed by Stryjek. The representation of the vapor – liquid equilibrium for the studied binary systems obtained from the isochoric data is consistent with the experimental vapor – liquid equilibrium data available in the literature. The superheated vapor data were correlated using the virial equation of state, in addition to the aforementioned equations of state. The vapor phase data showed good agreement with the values calculated with the equations of state and the predictions provided by REFPROP 10.0.