Persian Gulf University Journal of Oil, Gas and Petrochemical Technology 2383-2770 2 Number 1 2015 03 01 New Local Composition-Equation of State Mixing Rules for High Pressure Vapor-Liquid Equilibria Using EOS/AE 72 88 9844 10.22034/jogpt.2015.9844 EN Ali Haghtalab Department of Chemical Engineering, Tarbiat Modarres University, Tehran, Iran 0000-0001-7502-1883 Seyed Hossein Mazloumi Department of Chemical Engineering, Ferdowsi University, Mashad, Iran Journal Article 2014 04 14 In this study using Equation of State/ Helmholtz excess energy function,  EOS/A<sup>E</sup>, two new local composition-Equation-of State mixing rules, LCEOS1 and LCEOS2 were developed in which the energy interaction parameters were expressed in terms of attractive and repulsive parameters of the cubic equation of state. The EOS/A<sup>E</sup> models are applied for equilibrium calculation of natural gas that consists of light to heavy hydrocarbons with water and acid gases, i.e. H<sub>2</sub>S and CO<sub>2</sub>. Applying these new mixing rules, the bubble point pressure and vapor phase compositions at high pressure were simulated. The binary interaction parameters and a lumped nonrandomness parameter for the binary systems containing CO<sub>2</sub>, H<sub>2</sub>S, H<sub>2</sub>O, CH<sub>4</sub>, C<sub>2</sub>H<sub>6</sub>, EG, TEG were obtained. Using the binary parameters, solubility of CH<sub>4</sub> and C<sub>2</sub>H<sub>6</sub> in ternary systems CH<sub>4</sub>+EG+H<sub>2</sub>O and C<sub>2</sub>H<sub>6</sub>+EG+H<sub>2</sub>O were predicted, respectively. A comparison of these two new mixing rules with experimental data showed that both LCEOS1 and LCEOS2 demonstrated high accuracy. Vapor-liquid equilibria high pressure Cubic equation of state EOS/AE mixing rules New mixing rule https://jogpt.pgu.ac.ir/article_9844_e68d3c6431bf1e25eced5d26c301f68d.pdf