Prediction of Liquid-Liquid Equilibria of Binary Systems Containing Alcohols Using EoS-GE Models

In this work, the equation of state-excess Gibbs energy (EoS-GE) model has beenemployed to predict Liquid-Liquid Equilibria (LLE) of some binary mixtures at 0.1MPa. Three binary systems containing Decane+Methanol, Cyclohexane+Methanol andCyclohexane+2,2,2-Trifluoroethanol (TFE) have been tested using Peng–Robinson EoSmodified by Stryjek and Vera (PRSV), along with the excess Gibbs mixing rules MHV1and MHV2 and two excess Gibbs models: Wilson equation modified by Tsuboka andKatayama (T–K–Wilson) and UNIQUAC equation. The interaction parameters of T-KWilsonand UNIQUAC GE models for three binary systems have been determined fromLLE data points at 0.1 MPa. The prediction ability of the models has been evaluated bycomparison of the results with experimental data. Average Absolute Error (AAE) of0.047 for MHV1 and T–K–Wilson model, 0.0117 for MHV2 and T–K–Wilson model,0.0317 for MHV1 and UNIQUAC model and 0.0109 for MHV2 and UNIQUAC modelhave been obtained. As it is clear, the combination of MHV2 excess Gibbs mixing rulewith UNIQUAC equation shows a satisfactory agreement with experimental data.