Isothermal vapour-liquid equilibrium data for binary systems of (CHF 3 or C 2 F 6 ) with (1-hexene or 3-methylpentane)

Abstract

Abstract The isothermal vapour-liquid equilibria of R-23 + 1-hexene, R-23 + 3-methylpentane, R-116 + 1-hexene and R-116 + 3-methylpentane were measured at temperatures of between (293.1 and 313.3) K with a static-analytic apparatus. Vapour-liquid-liquid equilibria was exhibited by the R-116 + 1-hexene system. The equilibrium data was modelled with the PR EOS, modified with the MC alpha function, and the WS mixing rule with either the NRTL or the UNIQUAC activity coefficient model. Both the temperature dependent and the temperature independent forms of the models were regressed to the experimental data. The method of Ungerer et al. was used to extrapolate the subcritical co-existence data to the mixture critical loci, while the method of Heidemann and Khalil was used to estimate the critical locus curves for the systems. Each of the four systems were also categorised according to the classification system of van Konynenburg and Scott.