Isothermal vapor-liquid equilibrium for (fluoroethane+1,1-difluoroethane) binary system and (difluoromethane plus fluoroethane+1,1-difluoroethane) ternary system at temperatures from 263.15 K to 303.15 K

In this paper, the vapor-liquid equilibrium property were measured using a static analytical apparatus for the fluoroethane (R161) + 1,1-difluoroethane (R152a) binary system and difluoromethane (R32) + R161 + R152a ternary system. A total of 21 data points for R161 + R152a and 30 data points for R32 + R161 + R152a were obtained over the temperature range from 263.15 to 303.15 K. The data were regressed by the PR-vdW and PR-NRTL-MHV2 models. A pressure based objective function was used to correlate the VLE data at each tempera-ture. The maximum average absolute relative deviation in pressure calculated by the PR-vdW model are 0.75 % for R161 + R152a and 0.77 % for R32 + R161 + R152a, while those of the PR-NRTL-MHV2 model are 0.68 % for R161 + R152a and 0.62 % for R32 + R161 + R152a. No azeotropic behaviour can be observed for the binary and ternary system.

Automated summary

In this study, vapor-liquid equilibrium properties were measured for fluoroethane (R161) + 1,1-difluoroethane (R152a) binary system and difluoromethane (R32) + R161 + R152a ternary system using a static analytical apparatus. The measured data were regressed using PR-vdW and PR-NRTL-MHV2 models, with a pressure-based objective function used for correlation. The maximum average absolute relative deviation in pressure calculated by the models were 0.75% for R161 + R152a and 0.77% for R32 + R161 + R152a using PR-vdW model, and 0.68% for R161 + R152a and 0.62% for R32 + R161 + R152a using PR-NRTL-MHV2 model. No azeotropic behavior was observed in the binary and ternary systems.