“…This apparatus is shown schematically in Figure . It is described only briefly here because the apparatus and procedures have already been presented in more detail. − The apparatus consisted of an equilibrium unit, a sampling and analysis unit, and a supply unit. The equilibrium cell was made of type-316 stainless steel with an inner volume of about 128 cm 3 .…”
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.
“…This apparatus is shown schematically in Figure . It is described only briefly here because the apparatus and procedures have already been presented in more detail. − The apparatus consisted of an equilibrium unit, a sampling and analysis unit, and a supply unit. The equilibrium cell was made of type-316 stainless steel with an inner volume of about 128 cm 3 .…”
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.
“…This apparatus is shown schematically in Figure . It is described only briefly here because the apparatus and procedures have already been presented in more detail. , The apparatus consisted of an equilibrium unit, a sampling and analysis unit, and a supply unit. The core of the apparatus was the equilibrium unit, which consisted of an equilibrium cell, a magnetic pump, and a constant temperature-controlled bath.…”
Isothermal vapor-liquid equilibrium data of the binary system pentafluoroethane (HFC-125) + 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 0.1 to 0.8 mole fraction HFC-125. 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 0.77 mole fraction HFC-125. The vapor pressure of the azeotropic system is between those of chlorodifluoromethane (HCFC-22) and the zeotropic mixture of difluoroethane (HFC-32) + HFC-125 (50-50). This azeotropic system hasu good potential to replace the use of HCFC-22 as a refrigerant.
“…The most important unit is the equilibrium unit that consists of an equilibrium cell, a magnetic pump, and a constant temperature-controlled bath. The recirculation apparatus and the procedures used in this work are described only briefly here, as they have already been presented in more detail elsewhere. , 1 Schematic diagram of the vapor−liquid equilibrium apparatus: 1, equilibrium cell; 2, magnetic pump; 3, isothermal bath; 4, platinum resistance thermometer; 5, pressure transducer; 6, sample cylinder; 7, gas chromatograph; 8, vacuum pump; 9, refrigerant vessel. 2 Vapor−liquid equilibrium data for the HFC-32 + HFC-125 system: ○, this work;, Carnahan−Starling−De Santis (CSD) equations of state; - - -, Peng−Robinson (PR) equations of state; − − −, Redlich−Kwong−Soave (RKS) equations of state; □, Higsahi; ▵, Kobayashi and Nishiumi …”
Isothermal vapor-liquid equilibrium data of the binary system difluoromethane (HFC-32) + pentafluoroethane (HFC-125) were measured in the temperature range from 268.15 K to 308.15 K at 10 K intervals and in the composition range from 0.1 to 0.8 mole fraction. 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.
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