Vapor-liquid equilibrium of binary systems with EoS/GE models at low pressure: Revisiting the Heidemann-Kokal Mixing Rule

• Published in: Fluid phase equilibria Vol. 466; pp. 89 - 102
• Main Authors: Young, André F., Magalhães, Gabriela D.B., Pessoa, Fernando L.P., Ahón, Víctor R.R.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.06.2018
• Subjects: Binary systems; Heidemann-Kokal; LCVM; Vapor-liquid; Wong-sandler; Vapor-liquid; Binary systems; Heidemann-Kokal; LCVM; Wong-sandler
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/j.fluid.2018.03.016

In this work, a ϕ-ϕ approach is tested in the description of vapor-liquid equilibrium of 18 different binary systems by means of EoS/GE type models. These models combine the potentialities of the Peng-Robinson cubic equation of state and the UNIQUAC local composition model. The focus is on the Heidemann-Kokal Mixing Rule, whose derivation is presented. Systems including nonpolar - nonpolar, weakly polar - weakly polar, water - weakly polar, nonpolar - weakly polar, weakly polar - strongly polar and strongly polar - strongly polar compounds, besides systems involving immiscible components and carboxylic acids, were evaluated. Binary interaction parameters of the UNIQUAC model were estimated using a stochastic particle swarm algorithm, coupled to a Quasi-Newton deterministic algorithm. As a result, average deviations of less than 2% and 1% were obtained for vapor phase composition and bubble temperature or pressure correlation, respectively. The proposed modeling was efficient in the treatment of all evaluated systems and appears as a good alternative for the development of new models. [Display omitted]