Measurement of vapor-liquid equilibrium for the binary system propene (R1270) + trans-1,3,3,3‑tetrafluoropropene (R1234ze(E)) at temperatures from 288.18 K to 318.18 K

Abstract

The search for alternative refrigerants that are environmentally friendly and highly efficient has become one of the most urgent and important issues facing the refrigeration industry. R1270 has excellent thermodynamic properties, but its high flammability limits its range of applications. R1234ze(E) is an environmentally friendly refrigerant with negligible flammability though it has the drawback of poor heat transfer performance. R1270 can be blended with R1234ze(E) as a new mixture refrigerant. vapor–liquid equilibrium (VLE) is the basic physical property of mixtures. The vapor–liquid equilibrium data have been measured for the binary system R1270/ R1234ze(E) based on the liquid-phase cycling method at four temperatures (288.15 K, 298.15 K, 308.15 K, 318.15 K). All the experimental data were regressed by the Peng-Robinson (PR) equation of state (EoS) with the Huron–Vidal (HV) mixing rule involving the non-random two-liquid (NTRL) activity coefficient model, and the PR EoS relating to the van der Waals (vdWs) mixing rule. The results show that the predicted values by the two models are in good agreement with the experimental data, and the prediction accuracy of the PR + HV + NTRL model was higher than that of the PR + vdWs model. In addition, azeotropic behaviors of the binary mixture have been found in the measured temperature range.