Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Vapor - liquid equilibria (VLE) data for the difluoromethane (R32) + dimethyl ether (RE170) system were measured with the aim to complete our study on hydrogen-bonding between hydrofluorocarbons (HFCs) and dimethyl ether. The measurements were taken in an apparatus based on a static analytical method at temperatures ranging between (258.15 and 293.15) K. The R32 + RE170 system shows a slight negative deviation from the Raoult's law that are attributed to hydrogen bonding between RE170 and R32. This H-bonding was estimated using the homomorphic concept. The physical interaction was represented by the difference between the excess Gibbs energy (gE) of R32 + RE170 and of its corresponding homomorphic system, the R32 + propane (R290) system. The VLE data were reduced by means of the Carnahan-Starling-De Santis (CSD) equation of state (EoS) together with the classical mixing rule and then by means of the Redlich-Kwong-Soave (RKS) EoS, with the Huron-Vidal mixing rule, using the NRTL equation for the gE at infinite pressure. VLE data for the R32 + RE170 system are not reported elsewhere in the literature.