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International Journal of Chemical Engineering
Volume 2018, Article ID 7501659, 8 pages
Research Article

Basicity Characterization of Imidazolyl Ionic Liquids and Their Application for Biomass Dissolution

Chao Liu,1,2 Youming Li,1,2 and Yi Hou1,2

1State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
2National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou 510640, China

Correspondence should be addressed to Yi Hou; nc.ude.tucs@uohyec

Received 11 September 2017; Revised 7 November 2017; Accepted 6 December 2017; Published 30 January 2018

Academic Editor: Bhaskar Kulkarni

Copyright © 2018 Chao Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Alkalinity determination is of crucial significance for the applications of basic ionic liquids with imidazolyl. In this work, the ionization constant value and acid function values of ionic liquids synthesized were calculated by pH method and UV spectrum-Hammett method. The dissolution ratio of biomass in these ionic liquids was measured at different temperatures. Finally, the relationship between the alkalinity and structure of these ionic liquids was discussed, and the relationship between the alkalinity of ionic liquid and the dissolution mechanism biomass was also discussed. The results show that the basicity of carboxylate ionic liquids is determined mainly by their anions, whereas cations take some finely tuned roles. Furthermore, cations and anions are equally important and are involved in dissolution mechanisms.