Isothermal vapor-liquid equilibrium data of the binary system 1,1-difluoroethane (HFC-152a) + propane (R- 290) were measured in the temperature range from 273.15 K to 313.15 K at 10 K intervals and in the composition range from 0.2 to 0.8 mole fraction of propane. The temperature, pressure, and compositions of the liquid and vapor phases were measured with a circulation-type apparatus. The experimental data were correlated with the Carnahan-Starling-De Santis, Peng-Robinson, and Redlich-Kwong-Soave equations of state. Azeotropic behavior was revealed near 0.73 mole fraction of propane. The vapor pressure of the azeotropic system was compared with those of chlorodifluoroethane (HCFC-22) and the zeotropic mixture of difluoroethane (HFC-32) + pentafluoroethane (HFC-125) (50-50) (alternative refrigerant blend R-410A), the zeotropic mixture of HFC- 32 + HFC-125 + 1,1,1,2-tetrafluoroethane (HFC-134a) (23-25-52) (alternative refrigerant blend R-407C), dichlorodifluoromethane (HCFC-12), and HFC-134a. It was found that the vapor pressure of the azeotropic system was very close to that of HCFC-22. This azeotropic system has good potential to replace the use of HCFC-22 as a refrigerant.
Compounds
#
Formula
Name
1
C2H4F2
1,1-difluoroethane
2
C3H8
propane
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.