Isothermal Bubble Pressure Data for the Binary System of C₂F₆ and n-Octane

Abstract

Bubble pressure data for the system of hexafluoroethane and n-octane were measured at four temperatures in the range of (292.9 to 323.4) K and at pressures of up to 5.6 MPa. These isothermal P−x data were measured using a variable-volume static-synthetic apparatus. The Peng−Robinson Equation of State modified with the Mathias−Copeman alpha function coupled to the Wong− Sandler mixing rule was used to model the experimental data. The nonrandom two-liquid activity coefficient model was used to model the excess Gibbs energy term within the Wong−Sandler mixing rule. The temperature dependency of the thermodynamic model parameters was investigated at the temperatures for which data were measured. The binary system was categorized according to the van Konynenburg and Scott classification system.