Pure Component and Binary Vapor-Liquid Equilibrium + Modeling for Hexafluoropropylene and Hexafluoropropylene Oxide with Toluene and Hexafluoroethane

Shalendra C. Subramoney (1) , M. Nelson Wayne (1) , Alain Valtz (2) , Christophe Coquelet (2) , Dominique Richon (2) , Paramespri Naidoo (1) , Deresh Ramjugernath (1)

1 Thermodynamics Research Unit
2 CEP/Fontainebleau

Experimental pure component vapor pressure data for hexafluoropropylene (R1216) and hexafluoropropylene oxide (HFPO) are presented. Experimental vapor-liquid equilibrium (VLE) data are presented at two temperatures, (273 and 313) K, for four binary systems: R1216 + toluene, HFPO + toluene, hexafluoroethane (R116) + R1216, and R116 + HFPO. The measurements were undertaken using both a “static-analytic” apparatus fitted with a pneumatic rapid online sampler injector (ROLSI) and a “static-synthetic” PVT apparatus. The experimental vapor pressure data were regressed to obtain correlated parameters for the Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK) equations of state with the Mathias-Copeman R function. The binary VLE data were regressed to obtain correlated parameters for three different model combinations: the PR equation of state with the Wong-Sandler (WS) mixing rules, the PR equation of state with the modified Huron-Vidal first-order (MHV1) mixing rules, and the SRK equation of state with the WS mixing rules. The Mathias-Copeman R function and the nonrandom two-liquid (NRTL) excess Gibbs energy model were used in conjunction with the equations of state and mixing rules. In general, the PR equation of state with the WS mixing rules provided the best correlation for the experimental data. The critical lines for the supercritical systems R116 + R1216 and R116 + HFPO, calculated with the PR equation of state with the WS mixing rules, are also presented.K and (283.6 to 290.1) K, respectively at 0.05 mass fraction of tetra-n-butylammonium bromide in aqueous solution. The experimental data were generated using an isochoric pressure-search method. The hydrate dissociation data for the tetra-n-butylammonium bromide + methane system are compared with the corresponding experimental data reported in the literature, and the acceptable agreement demonstrates the reliability of the experimental method used in this work. The experimental data for both measured systems are finally compared with the corresponding experimental data in the absence of tetra-n-butyl- ammonium bromide reported in the literature to study its hydrate promotion effect.

Domaines: Génie des procédés

Shalendra C. Subramoney, M. Nelson Wayne, Alain Valtz, Christophe Coquelet, Dominique Richon, et al.. Pure Component and Binary Vapor-Liquid Equilibrium + Modeling for Hexafluoropropylene and Hexafluoropropylene Oxide with Toluene and Hexafluoroethane. Journal of Chemical and Engineering Data, 2010, 55, pp.411-419. ⟨10.1021/je900400v⟩. ⟨hal-00573829⟩