Measurement and Correlation of Isothermal Vapor–Liquid Equilibrium of Fluoroethane + Dimethyl Ether Triethylene Glycol, 1,1-Difluoroethane + Dimethyl Ether Triethylene Glycol, and 1,1-Difluoroethane + N-Methyl-2-pyrrolidone Systems

Abstract

In this paper, the vapor−liquid equilibrium (VLE) data of three systems, fluoroethane (HFC161) + dimethyl ether triethylene glycol (DMETrEG), 1,1-difluoroethane (HFC152a) + DMETrEG, and HFC152a + N-methyl-2-pyrrolidone (NMP), were measured from 293.15 to 353.15 K. The five-parameters nonrandom two-liquid (NRTL) model was selected to correlate the VLE data. For the HFC161 + DMETrEG, HFC152a + DMETrEG, and HFC152a + NMP systems, the average relative deviations of the pressure are 1.33%, 1.43%, and 1.23%, respectively, and the maximum deviations of the pressure are 3.70%, 3.66%, and 3.29%, respectively. The VLE behavior of HFC161/HFC152a + ethers, amides, and ketone systems were discussed by comparing the activity coefficient with the values for seven literature working pair systems and analyzing the interactions of the intermolecular hydrogen bonds. The results show that the HFC161 + absorbent systems exhibit negative deviations from Raoult's law and have a relatively good affinity compared to the HFC152a + absorbent systems. Moreover, the HFC161 + DMETrEG and HFC152a + DMETrEG systems exhibit stronger affinity than the HFC152a + NMP system and can be considered as potential alternatives for working pair systems of the absorption power cycle.

Electronic properties and primarily dissociation channels of fluoroethane compounds

“…Generally physiccochemical properties of hydrofluoroethane compounds have been investigated as the alternative refrigerants. [1][2][3][4][5] The typical example is HFC-134a (1,1,1,2tetrafluoro-ethane) used as the refrigerant for most of car air conditioners. The other hydrofluoroethane compounds are also examined as the refrigerants, as the alternative ones for traditional CFC refrigerants, because of the low global warming potentials and the insignificant ozone depletion potentials.…”