The Generalized NRTL Model Associated with the Peng-Robinson Equation of State to Predict Liquid-Liquid Equilibria Between Hydrocarbons,Water and Ethylene Glycol

In this study, the generalized NRTLmodel is combined with the Peng-Robinson equation of state in order to predict the liquid-liquid equilibrium of binary systems containing hydrocarbons, water and glycols. In the proposed model, the binary interaction parameters of theNRTLmodel are predicted bymeans of a group contributionmethod, while the volume and surface-area parameters of pure components introduced in the generalized NRTL version are estimated from the UNIFAC group contribution method. The results obtained in this paper are comparedwith those provided bywell knownmodels described in the literature.