Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Novel isothermal (P x y) vapour liquid equilibrium data are reported at three temperatures for each of the (1,1,2,3,3,3-hexafluoro-1-propene + 1-butene), (2,2,3-trifluoro-3-(trifluoromethyl)oxirane + 1-butene), and (difluoromethane + 1-butene) binary systems. The experimental values were measured on a static analytic type apparatus which utilized two electromagnetic ROLSI (TM) capillary samplers for repeatable and reliable equilibrium phase sampling and handling. The VLE results are correlated with in-house thermodynamic software based on the PR-MC-WS-NRTL model which comprises the Mathias Copeman alpha function, Wong Sandler mixing rule, and non-random two-liquid local composition activity model introduced in the Peng Robinson equation of state. A maximum pressure azeotrope is observed at all temperatures studied for the (2,2,3-trifluoro-3-(trifluoromethyl)oxirane + 1-butene), and (difluoromethane + 1-butene systems), but not for the 1,1,2,3,3,3-hexafluoro-1-propene system. Liquid liquid immiscibility is not observed for any of the systems studied over the range of temperatures investigated.