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Vapor-Liquid Equilibrium is a necessary element for desinging and developing chemical processes as well as enhancing our understanding of fluid-phase behaviors. In this work, VLE data of binary and ternary systems of Isopropanol + 1-Chlorobutane + Acetonitrile have been measured under constant pressure of 101.3 kPa. Experimental data of the binary systems of Isopropanol + 1-Chlorobutane, Isopropanol + Acetonitrile and 1- Chlorobutane + Acetonitrile were thermodynamic consistent via Herington analysis. In the treatment of experimental data, both binary systems and the ternary system were correlated by van Laar, Margules, Wilson, NRTL and UNIQUAC equations. The performance of the five models used was almost the same accuracy in the correlation of each binary and the ternary systems, while the performance of the Wilson equation was the best. In the prediction of the ternary system from their constituent binaries, the Wilson and NRTL equations gave the better results for this work.
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