Vapor-liquid equilibria of the trans–1,3,3,3-tetrafluoropropene (R1234ze(E)) + isobutane (R600a) system at various temperatures from (258.150 to 288.150 K)

X. Dong1, M. Gong1 and J. Wu1

1Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, P.R. China

Keywords: azeotropic mixture; refrigerant
property: equilibrium
material: R1234ze(E)

The VLE data for the binary system of trans–1,3,3,3-tetrafluoropropene (R1234ze(E)) + isobutane (R600a) were measured using a recirculation apparatus with view windows at four temperatures (258.150, 268.150, 278.150 and 288.150 K). A self-made magnetic pump was used to drive the vapor phase into the liquid phase. A 25 Ω standard platinum resistance thermometer was used to measure the temperatures of the equilibrium cell. The temperatures in the cell were collected by a Guildline 6622A resistance/thermometry bridge. The pressures in the cell were measured by a mensor series 6000 digital pressure transducer with uncertainties of ± 0.00025 MPa. The compositions of the vapor and liquid phase were analyzed by a gas chromatograph (Shimadzu GC2014). The measured uncertainties of the temperature, pressure, and compositions are ± 5 mK, ± 0.0005 MPa, and ± 0.005, respectively. All the experimental data were correlated by the Peng-Robinson (PR) EoS with the Huron-Vidal (HV) mixing rule involving the non–random two–liquid (NRTL) activity coefficient (PR–HV–NRTL) model. The maximum average absolute relative deviation of pressure is 0.32 %, while the maximum average absolute deviation of vapor phase mole fraction is 0.0029. Azeotropic behavior can be found at the measured temperature range.

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