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Progress in Chemistry 2009, Vol. 21 Issue (09): 1807-1812 Previous Articles   Next Articles

• Review •

Dissolution and Separation of Lignocellulose with Room-Temperature Ionic Liquids

Zheng Yong1 ;  |Xuan Xiaopeng1 ;  |Xu Airong2  ; |Guo Meng1 ;  |Wang Jianji1**   

  1. （1.School of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, China；2.School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China)
  • Received: Revised: Online: Published:
  • Contact: Wang Jianji E-mail:jwang@henannu.edu.cn
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As the richest biomass in the world, lignocellulose is the natural feedstock for producing clean energy and fine chemicals. Room-temperature ionic liquids, as a class of green materials developed in recent years, have important applications in the area of dissolution and separation of lignocellulose. In this paper, after a brief introduction for the composition and structure of lignin, cellulose, hemicellulose and room-temperature ionic liquids, the recent progress in dissolution and separation of lignocellulose with ionic liquids is reviewed. Based on the experimental results reported in literature, the dissolution and separation performance of ionic liquids for lignin, cellulose and hemicellulose are summarized. The relationship between structure of ionic liquids and their dissolution performance is analyzed, and the possible dissolution mechanism is discussed. Finally, some problems in this area are proposed and the development tendency is prospected.

Contents
1 Introduction
2 The composition and structure of lignocellulose and relative room-temperature ionic liquids
2.1 The composition and structure of lignocellulose
2.2 The structure of room-temperature ionic liquids applied in dissolution and separation of lignocellulose
3 The recent process in dissolution of lignocellulose with room-temperature ionic liquids
3.1 Dissolution of lignin in room-temperature ionic liquids
3.2 Dissolution of cellulose in room-temperature ionic liquids
3.3 Dissolution of hemicellulose in room-temperature ionic liquids
4 The recent process in separation of lignocellulose with room-temperature ionic liquids
5 Prospects

Key words: room-temperature ionic liquids, lignocellulose, dissolution, separation

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