Vapor–liquid equilibria and densities of ternary mixtures of fluorinated ethers with hydrofluorocarbons as R22 alternatives

Vapor pressure data below the normal boiling point are presented for ternary mixtures that are prepared from the following chemicals: perfluoro[methylethyl ether] (RE-218), pentafluorodimethylether (RE-125), 1,1,1-trifluorodimethylether (RE-143a), dimethylether (RE-170), 1,1,1,2-tetrafluoroethane (R-134a), 1,1,1-trifluoroethane (R-143a), 1,1-difluoroethane (R-152a), fluoroethane (R-161), and difluoromethane (R-32). Liquid–liquid phase separation in the binary mixtures RE-218/RE-170 and RE-218/R-161 is eliminated with the ternary mixtures, RE-218/RE-143a/RE-170 and RE-218/R-134a/R-161. A sufficient amount of vapor pressure data was obtained for these ternary mixtures to calculate vapor–liquid phase relations using van Laar equations for ternary mixtures. Vapor pressure data are also reported for a number of ternary mixtures containing RE-125. Liquid density data and the critical parameters are reported for the equimolar mixtures, RE-218/R-134a/R-161, RE-125/R-32/R-152a, and RE-125/R-32/R-134a, which are judged to have a high potential as R-22 alternatives based on their boiling point and critical temperature.