Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

(Vapor + liquid + liquid) equilibrium measurements and correlation for {1,1,2,2-tetrafluoroethane (R134) + isobutane (R600a)} system

Zhao, Y.[Yanxing], Gong, M.[Maoqiong], Dong, X.[Xueqiang], Guo, H.[Hao], Wu, J.[Jianfeng]
J. Chem. Thermodyn. 2014, 78, 182-188
ABSTRACT
In this work, a study on the (vapor + liquid + liquid) equilibrium (VLLE) for the (R134 + R600a) system was carried out using an apparatus based on the recirculation of vapor into liquid at temperatures ranging from (235.311 to 241.720) K. The uncertainties of the composition, temperature, and pressure were less than +-0.005, +-5 mK and +-0.5 kPa, respectively. Thirty-eight experimental p T x data covering both branches of the binodal boundary and nineteen experimental p T y data were presented. Three numerical methods were used to obtain the second liquid phase compositions coexisting in equilibrium, and all the three methods lead to consistent results. Moreover, all of the experimental data were correlated by the Peng Robinson equation of state (PR EoS) with the Huron Vidal (HV) mixing rule involving the non-random two-liquid (NRTL) activity coefficient model. Then the vapor phase compositions were calculated. The results show good agreement with the experimental data, and the maximum deviation is less than 0.006.
Compounds
# Formula Name
1 C2H2F4 1,1,2,2-tetrafluoroethane
2 C4H10 2-methylpropane
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 2
  • 1
  • Upper consolute temperature, K ; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Gas
  • Derived from LLE data
  • 1
  • POMD
  • 2
  • 1
  • Upper consolute composition: mole fraction - 1 ; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Gas
  • Derived from LLE data
  • 1
  • POMD
  • 2
  • 1
  • Upper consolute pressure, kPa ; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Gas
  • Derived from LLE data
  • 1
  • POMD
  • 2
  • 1
  • Vapor or sublimation pressure, kPa ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Gas
  • Closed cell (Static) method
  • 38
  • POMD
  • 2
  • 1
  • Mole fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Gas
  • Chromatography
  • 38
  • POMD
  • 2
  • 1
  • Mole fraction - 1 ; Gas
  • Temperature, K; Liquid mixture 1
  • Gas
  • Liquid mixture 1
  • Liquid mixture 2
  • Chromatography
  • 19
  • POMD
  • 2
  • 1
  • Vapor or sublimation pressure, kPa ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Gas
  • Closed cell (Static) method
  • 19