Vapor−Liquid Equilibrium Data for Binary Systems Consisting of Either Hexafluoropropene (HFP) or 2,2,3-Trifluoro-3-(trifluoromethyl)oxirane (HFPO) with Carbon Dioxide (R-744) or 2,2-Dichloro-1,1,1-trifluoroethane (R-123)

Abstract : Isothermal vapor-liquid equilibrium (VLE) data for the binary systems R-744 + HFP and R-744 + HFPO were measured at (273.15 and 313.15) K and pressures up to 5.6 MPa. Measurements were also undertaken for the HFP + R-123 and HFPO + R-123 systems at (313.15 and 333.15) K and pressures up to 1.5 MPa. The VLE data were measured via the “static-analytic” method using a fixed-volume equilibrium cell equipped with a pneumatic ROLSI sampler. The measured data have maximum uncertainties of 0.045 K and 0.003 MPa in temperature and pressure, respectively, while the relative uncertainties in the equilibrium phase analyses are within 1 % for the molar compositions. The experimental data were correlated using the Peng-Robinson equation of state with the Mathias-Copeman R function and the Wong-Sandler mixing rules incorporating the NRTL activity coefficient model.