Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Isothermal vapour + liquid equilibria data were measured for the binary systems pentafluoroethane + cyclopropane and cyclopropane + 1,1,1,2- tetrafluoroethane at 253.15, 273.15 and 293 15 K, using a static analytical method. The phase compositions at equilibrium were measured by gas chromatography. The experimental estimated accuracies are +-0.02K for temperature, +-1 kPa for pressure, and +-0.003 in mole fraction for both liquid and vapour phase composition. Both systems show strong positive deviations from Raoult s law with the formation of an azeotrope. The experimental data were regressed using the Peng-Robinson-Stryjek-Vera equation of state, with different mixing rules, i.e. theVan derWaals mixing rule with one or two interaction parameters, and Huron-Vidal and Wong-Sandler mixing rules. A comparison with literature data was performed.