In this study, a substitutive entrainer is found for the azeotropic process of water and isopropyl alcohol (IPA). Liquid−liquid equilibrium (LLE) data are measured for the ternary systems of water−IPA−benzene, water−IPA−cyclohexane, and water− IPA−hexane at three different temperature values: 303, 313, and 323 K. The liquid−liquid equilibrium data are developed via an experimental setup equipped with equilibrium cell, magnetic stirrer, and gas chromatography units. Equilibrium compositions for the water−IPA system are found by using three different entrainers: benzene, cyclohexane, and hexane. Parameters calculated by nonrandom two-liquid (NRTL) and universal quasichemical (UNIQUAC) thermodynamic models are compared with the data obtained by experiments, and the comparison shows a good correlation between thermodynamic models and the experimental data.

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