Application of Soave-Redlich-Kwong Equation of State in Combination with Wilson Parameters Having Controlled Influence by Temperature to Estimation of Vapor-Liquid Equilibrium

Abstract

The attracting term in Soave-Redlich-Kwong (SRK) equation was modified, using the Heidemann and Kokal mixing rule at zero pressure to estimate the vapor-liquid equilibrium of some alcohol systems, in the range of respective critical points. In this work, Wilson parameters were applied to calculate the excess Gibbs energy, and expressed by respective curve of secondary degree of reciprocal temperature.
Vapor-liquid equilibrium of ethane-propane, CO₂-ethane, CO₂-propane, methanol-water and ethanolwater systems could be estimated from the data of low pressure vapor-liquid equilibrium, using SRK equation in combination with Wilson parameter, within average deviation of 5.35%.