Abstract
Novel isothermal (p–x–y) vapor–liquid equilibrium data are reported for ethane (R-170) + 1,1,2,3,3,3-hexafluoro-1-propene (R-1216) mixtures at five temperatures in the (282.93 to 322.89) K range, at pressures up to about 4.6 MPa. The experimental data were measured using an apparatus based on the “static-analytic” method taking advantage of two electromagnetic capillary samplers for repeatable and reliable equilibrium phase sampling and handling. The experimental data are well-correlated with the “PR-MC-NRTL-WS” model constituted by the Mathias–Copeman α function, nonrandom two-liquid (NRTL) local composition model, and Wong–Sandler mixing rule introduced in the Peng–Robinson equation of state. The studied system did not exhibit azeotropic behavior nor liquid–liquid immiscibility over the range of investigated temperatures. Mixture critical points have been estimated from the experimental vapor–liquid equilibrium data via the extended scaling laws and the “PR-MC-NRTL-WS” model and are found to be in good agreement with the experimental isothermal phase envelopes.
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