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| - Isothermal VLE Measurements for Difluoromethane + DimethylEther and an Evaluation of Hydrogen Bonding
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| - Vapor−liquid equilibria (VLE) data for the difluoromethane (R32) + dimethyl ether (RE170) system weremeasured with the aim of completing our study of hydrogen bonding between hydrofluorocarbons (HFCs)and dimethyl ether. The measurements were taken in an apparatus based on a static analytical methodat temperatures ranging between (258.15 and 293.15) K. The R32 + RE170 system shows a slight negativedeviation from Raoult's law that is attributed to hydrogen bonding between RE170 and R32. This Hbonding was estimated using the homomorphic concept. The physical interaction was represented by thedifference between the excess Gibbs energy (gE) of R32 + RE170 and its corresponding homomorphicsystem, 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 bymeans of the Redlich−Kwong−Soave (RKS) EoS, with the Huron−Vidal mixing rule, using the NRTLequation for gE at infinite pressure. VLE data for the R32 + RE170 system are not reported elsewherein the literature.
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