A cubic equation of state for predicting vapor—liquid equilibria of hydrocarbon mixtures using a group contribution mixing rule
Resource
Fluid Phase Equilibria 46 (2-3): 197-210
Journal
Fluid Phase Equilibria
Journal Issue
46
Pages
197-210
Date Issued
1989
Date
1989
Author(s)
Abstract
The cubic equation of state of Patel and Teja is used in this study for vapor-liquid equilibrium calculations on straight-chain paraffins. Various modifications of the combinatorial part of UNIFAC are tested as models of the excess Gibbs free energy at infinite pressure for calculating equation of state parameters of mixtures. A new formulation is also presented in this study; which was found to give improved vapor-liquid equilibrium predictions for binary and ternary mixtures, especially for mixtures containing molecules of very different sizes and shapes. The results of this work lead to a predictive cubic equation of state with no adjustable coefficients that depend on the characteristics of the binary pair for paraffinic hydrocarbons. This new model was found to be as good as the conventional use of equation of state equations with van der Waals mixing rules and optimal binary interaction parameters. © 1989.
SDGs
Type
journal article