Experimental (vapour + liquid) equilibrium data and modelling for binary mixtures of decafluorobutane with propane and 1-butene

Highlights: • Isothermal VLE data for propane + decafluorobutane at (312.92. 327.94 and 342.94) K. • Isothermal VLE data for 1-butene + decafluorobutane at (312.92, 327.93, and 342.93) K. • Experimental data correlated with the Peng–Robinson EoS with Wong–Sandler mixing rule. • Maximum pressure azeotropy observed for both systems. -- Abstract: (Vapour + liquid) equilibrium (P–x–y) data are reported at three isotherms for the (propane + decafluorobutane), and (1-butene + decafluorobutane) binary systems. The range of temperatures extended from 312.92 K to 342.94 K. An apparatus based on the "static-analytic" method, which had two electromagnetic ROLSITM samplers, for repeatable and reliable equilibrium phase sampling and handling, was used to undertake the measurements. The experimental values were correlated with the "PR–MC–NRTL–WS" model which comprised the Mathias–Copeman alpha function, Wong–Sandler mixing rule, and NRTL local composition model which were incorporated into the Peng–Robinson equation of state. Maximum pressure azeotropy is observed for both systems at all investigated temperatures. Liquid–liquid immiscibility was not observed over the range of temperatures studied