Vapor-Liquid Equilibria and Simulation of Extractive Distillation for Ternary Mixtures of Isopropyl Alcohol, Isopropyl Acetate and DMSO

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Abstract

The vapor-liquid equilibrium (VLE) data for the binary system isopropyl alcohol+dimethyl sulfoxide (DMSO), isopropyl acetate+DMSO and ternary system isopropyl alcohol+isopropyl acetate+DMSO were measured with a VLE modified Othmer still at 101.3 kPa. The experimental data were proved to be thermodynamically consistent when the point to point consistency test of Van Ness test was applied. The binary experimental data were correlated with the NRTL, Wilson and UNIQUAC activity coefficient models. Then, the ternary VLE data were predicted with the obtained binary interaction parameters. The results indicate that the calculated values are in good agreement with the experimental data. The results predicted by the Wilson models are slight better than those of other models. The binary azeotrope of isopropyl alcohol and isopropyl acetate was eliminated when added a certain amount of DMSO. Therefore, DMSO is a potential extractive agent to separate the azeotrope. Then, the extractive distillation of the ternary system was simulated using obtained binary interaction parameters with the process simulation software Aspen Plus. The separation conditions of isopropyl alcohol and isopropyl acetate with different operational parameters (stage number, feed stage, solvent ratio and reflux ratio) were discussed and the optimum conditions were achieved.

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	Li Jiaqi
	Ding Hui
	Gao Yujie
	Liu Shejiang

Keywords： isopropyl alcohol； isopropyl acetate； dimethyl sulfoxide； vapor liquid equilibrium

Received 2016-03-28;

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Li Jiaqi, Ding Hui, Gao Yujie, Liu Shejiang.Vapor-Liquid Equilibria and Simulation of Extractive Distillation for Ternary Mixtures of Isopropyl Alcohol, Isopropyl Acetate and DMSO[J] Chemcial Industry and Engineering, 2017,V34(6): 62-69

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