Vapor-liquid equilibrium measurements for the binary mixtures of 1,1-difluoroethane (R152a) with trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) and 3,3,3-trifluoropropene (R1243zf)

In this work, vapor-liquid equilibrium (VLE) of R152a + R1234ze(E) and R152a + R1243zf systems were measured by using a recirculation analytical apparatus from 273.15 to 313.15 K. The maximum experimental standard uncertainties of the temperature, pressure, and composition were 5 mK, 0.6 kPa, and 0.0024, respectively. The Peng-Robinson (PR) equation combined with the van der Waals (vdW) mixing rule was used to correlate the VLE data for the two systems. The average relative deviation of pressure (ARD(p)) and the average absolute deviation of vapor phase mole fraction (AAD(y)) were 0.16% and 0.0012 for the R152a + R1234ze(E) system. The ARD(p) and AAD(y) were 0.11% and 0.0012 for the R152a + R1243zf system. The VLE data and correlation results showed that the R152a + R1234ze(E) system is zeotropic and the R152a + R1243zf system is azeotropic in the measured temperature range. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

In this study, the vapor-liquid equilibrium (VLE) of the R152a + R1234ze(E) and R152a + R1243zf systems was measured and analyzed using a mathematical model. The results showed that the R152a + R1234ze(E) system is zeotropic while the R152a + R1243zf system is azeotropic.