(VAPOR PLUS LIQUID) EQUILIBRIUM MEASUREMENTS AND CORRELATIONS OF THE REFRIGERANT MIXTURE (DIMETHYL ETHER (RE170)-HEXAFLUOROPROPANE (R236FA)) AT THE TEMPERATURES (303.68 AND 323.75) K(1,1,1,3,3,3)

(Vapour + liquid) equilibrium (VLE) data were measured for the refrige rant mixture {dimethyl ether (RE170) + 1,1,1,3,3,3-hexafluoropropane ( R236fa)} at the temperatures (303.68 and 323.75) K. The VLE data were obtained using forced recirculation of the vapour through the liquid b y means of a magnetic pump. The composition of both phases was determi ned by gas chromatography. The experimental VLE data are regressed usi ng the Carnahan-Starling-De Santis equation of state, which was chosen for its ability to represent the volumetric properties along bubble a nd dew point curves. The experimental data show negative deviations fr om Raoult's law that can be attributed to hydrogen bonding between oxy gen in RE170 (proton acceptor) and hydrogen (evidently a proton donor, judging from our measurements) in R236fa. VLE data of the studied sys tem are not available elsewhere in the literature. (C) 1998 Academic P ress.