Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (3): 365-372.DOI: 10.1016/j.cjche.2015.10.012

• CHEMICAL ENGINEERING THERMODYNAMICS • Previous Articles     Next Articles

Effect of methylimidazolium-based ionic liquids on vapor-liquid equilibrium behavior of tert-butyl alcohol+water azeotropic mixture at 101.3 kPa

Zhigang Zhang, Qiang Zhang, Tao Zhang, Qinqin Zhang, Wenxiu Li   

  1. Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 110142, China
  • Received:2014-12-31 Revised:2015-08-13 Online:2016-04-08 Published:2016-03-28
  • Supported by:

    Supported by the National Natural Science Foundation of China(21076126), the Program for Liaoning Excellent Talents in University(2012013) and the Liaoning Province Science Foundation of China(2014020140).

Abstract: Three ionic liquids(ILs), 1-ethyl-3-methylimidazoliumbromine([EMIM] Br), 1-butyl-3-methylimidazoliumbromine([BMIM] Br), and 1-hexyl-3-methylimidazoliumbromine([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.

Key words: Azeotrope, Ionic liquids, Vapor-liquid equilibrium, Relative volatility, NRTL model