Thermodynamic modeling of vapor-liquid equilibria and excess properties of the binary systems containing diethers and n-alkanes by cubic equation of state

Abstract

A comparison of the performances of two different approaches of cubic equations of state models, based on a classical van der Waals and mixing rules incorporating the G(E) equation, was carried out for correlation of Vapor-Liquid Equilibria (VLE), H-E and c(P)(E) data alone, and simultaneous correlation of VLE+H-E, VLE+c(P)(E), H-E+c(P)(E) and VLE+H-E+c(P)(E) data for the diethers (1,4-dioxane or 1,3-dioxolane) with n-alkane systems. For all calculations the Peng-Robinson-Stryjek-Vera cubic equation of state (PRSV CEOS) was used. A family of mixing rules for the PRSV CEOS based on the Modified van der Waals one-fluid mixing rule (MvdW1) and two well-known CEOS/GE mixing rules (MHV1 and MHV2), was considered. The NRTL equation, as the G(E) model with linear or reciprocal temperature dependent parameters, was incorporated in the CEOS/G(E) models. The results obtained by the CEOS/G(E) models exhibit significant improvement in comparison to the MvdW1 models.