Vapor-liquid equilibrium for the binary mixed refrigerant {R1234ze(E) + R1336mzz(E)} at temperatures from 283.15 K to 313.15 K

Abstract

Growing concerns regarding energy and environmental issues have prompted the development of refrigerants focused on energy conservation and environmental protection. Mixed refrigerants incorporating fourth-generation hydrofluoroolefins (HFOs) represent a promising advancement. Notably, R1234ze(E) and R1336mzz(E) are representative examples of environmentally friendly refrigerants within the HFO category. In this study, a vapor–liquid equilibrium (VLE) experimental apparatus was constructed based on the liquid-phase cycling method, and the VLE data for eleven R1234ze(E) + R1336mzz(E) mixed refrigerants with varying proportions were measured within the temperature range of 283.15 ∼ 313.15 K. In addition, all the experimental data were correlated using two models: the Peng-Robinson (PR) equation of state combined with the van der Waals (vdW) mixing rule, and the PR equation of state combined with the Huron-Vidal (HV) mixing rule involving the non-random two-liquid (NRTL) activity coefficient. The results indicate that R1234ze(E) + R1336mzz(E) mixed refrigerants do not exhibit azeotropic behavior within the studied temperature range. Furthermore, both the PR + vdW and PR + HV + NRTL models show good agreement with the experimental data, with the latter model demonstrating superior performance.