Liquid–Liquid Equilibrium Data for the Ternary Systems of Water, Isopropyl Alcohol, and Selected Entrainers

Abstract

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.