Phase equilibrium for the binary mixture of 1,1,2,3,3,3-hexafluoro-1-propene (R1216) + propane (R290) at temperatures from 283.15 to 313.15 K

Abstract

Based on the study of the mixture containing 1,1,2,3,3,3-hexafluoro-1-propene (R1216) and propane (R290) by a set of static-analytical type experimental apparatus, this paper presents a series of vapour-liquid equilibrium data at the temperature from 283.15 K to 313.15 K. It is the first time to report the VLE data at a temperature below 313.15 K. Moreover, the uncertainties of pressure, temperature, and mole fraction in this experiment were determinate. The PR equation of state (EoS) combined with the following two models respectively, the van der Waals (vdWs) mixing rule and the Huron-Vidal (HV) mixing rule relating to the non-random two-liquid (NRTL) activity coefficient model were used to correlate the experimental VLE data of the binary system. Two models all presented an extremely content correlation of the experimental data for the R290 + R1216 mixtures, and the second model is more suitable as the pressure's maximum average relative and absolute deviation are 0.003 and 0.0026, respectively, and the maximum average absolute deviation of the vapor phase mole fraction AAD(y) is 0.0045. Near azeotropic phenomenon occurred within the temperature range of the experiment when the proportion of R290 is about 0.6 to 0.7.