Journal
CHINESE JOURNAL OF CHEMICAL ENGINEERING
Volume 24, Issue 3, Pages 365-372Publisher
CHEMICAL INDUSTRY PRESS
DOI: 10.1016/j.cjche.2015.10.012
Keywords
Azeotrope; Ionic liquids; Vapor-liquid equilibrium; Relative volatility; NRTL model
Categories
Funding
- National Natural Science Foundation of China [21076126]
- Program for Liaoning Excellent Talents in University [2012013]
- Liaoning Province Science Foundation of China [2014020140]
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Three ionic liquids (ILs), 1-ethyl-3-methylimidazolium bromine ([EMIM] Br), 1-butyl-3-methylimidazolium bromine ([BMIM] Br), and 1-hexyl-3-methylimidazolium bromine ([HMIM] Br), were used as the solvent for separation of {tert-butyl alcohol (TBA)+ water} azeotrope. Vapor-liquid equilibrium(VLE) data for {TBA+ water+ IL} ternary systems were measured at 101.3 kPa. The results indicate that all the three ILs produce an obvious effect on the VLE behavior of {TBA + water} system and eliminate the azeotropy in the whole concentration range. [EMIM] Br is the best solvent for the separation of {TBA + water} system by extractive distillation among the three ILs. The experimental VLE data for the ternary systems are correlated with the NRTL model equation with good correlations. Explanations are given with activity coefficients of water and TBA, and the experimental VLE-temperature data for {TBA or water + IL} binary systems. (c) 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
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