Vapor–liquid equilibria for carbon dioxide + 1,1,1,2-tetrafluoroethane (R-134a) systems at temperatures from 329 to 354 K and pressures upto 7.37 MPa
2002; Elsevier BV; Volume: 199; Issue: 1-2 Linguagem: Inglês
10.1016/s0378-3812(01)00816-0
ISSN1879-0224
AutoresGuadalupe Silva-Oliver, Luis A. Galicia‐Luna,
Tópico(s)Thermodynamic properties of mixtures
ResumoVapor–liquid equilibrium state of carbon dioxide (CO2) + 1,1,1,2-tetrafluoroethane (R-134a) mixture at 329.60, 339.10 and 354 K and pressures upto 7.369 MPa have been measured in the whole range of compositions. Monophasic PvT properties were also determined for R-134a at temperatures from 313.13 to 342.9 K upto 25 MPa with an uncertainty lower than ±0.05%. The classical calibration method of the vibrating tube densimeter was used with N2 and H2O as reference fluids. The parameters of the Peng–Robinson equation of state (PR EoS) for both classical and Wong–Sandler mixing rules were fitted to experimental vapor–liquid equilibria at 329.60 K and used to predict the vapor–liquid equilibria at higher temperatures. Wong–Sandler mixing rules give better results than the classical mixing rules. The R-134a densities reported in this work were compared to the calculated values using the Tillner-Roth–Baehr EoS.
Referência(s)