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Isobaric Vapor–Liquid Equilibrium for the Acetonitrile + Water System Containing Different Ionic Liquids at Atmospheric Pressure

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School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China
*Tel.: 86-022-60202246; fax: 86-022-26564475. E-mail address: [email protected] (J.F.).
Cite this: J. Chem. Eng. Data 2013, 58, 6, 1483–1489
Publication Date (Web):May 23, 2013
https://doi.org/10.1021/je3009792
Copyright © 2013 American Chemical Society

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    Abstract

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    Isobaric vapor–liquid equilibrium (VLE) data for the acetonitrile + water system containing ionic liquids (ILs) at atmospheric pressure (101.3 kPa) were measured. The ionic liquids investigated were 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]), 1-butyl-3-methylimidazolium dibutyl phosphate ([Bmim][DBP]), and 1-butyl-3-methylimidazolium chloride ([Bmim][Cl]). The results showed that [Bmim][BF4] was ineffective to the enhancement of relative volatility of the acetonitrile + water system. [Bmim][DBP] and [Bmim][Cl] could increase the relative volatility of acetonitrile in the whole concentration range and eliminate the azeotropic point. The separation ability of ILs was [Bmim][Cl] > [Bmim][DBP]. VLE data for the acetonitrile + water + IL systems were correlated by the nonrandom two-liquid (NRTL) model. The NRTL model was applicable to the correlation of ILs containing systems with the average deviation being 5.17 %.

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