Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (5): 757-762.DOI: 10.1016/S1872-2067(14)60036-X

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Basic ionic liquids promoted the synthesis of glycerol 1,2-carbonate from glycerol

YuxuanYia, Yue Shena, Jiankui Suna, Bo Wanga, Feng Xua, Runcang Suna,b   

  1. a Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China;
    b State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2013-11-14 Revised:2014-01-03 Online:2014-04-18 Published:2014-04-24
  • Supported by:

    This work was supported by the National Science and Technology Program of the Twelfth Five-Year Plan Period (2012BAD32B06), Fundamental Research Funds for the Central Universities (TD2011-11), the National Natural Science Foundation of China (31170556), New Century Excellent Talents in University (NCET-13-0671), Beijing Higher Education Young Elite Teacher Project (YETP0765), China Postdoctoral Science Special Foundation (2012T50051), and the National Basic Research Program of China (973 Program, 2010CB732204).

Abstract:

Glycerol has been subjected to a transesterification process with dialkyl carbonate to generate glycerol 1,2-carbonate (GC) using different ionic liquids as catalysts under solvent-free conditions. The basic ionic liquids 1-butyl-3-methylimidazolium imidazolium ([Bmim]Im), 1-butyl-3-methylimidazolium hydroxide ([Bmim]OH), 1-allyl-3-methylimidazolium imidazolium ([Amim]Im), and 1-allyl-3-methylimidazolium hydroxide ([Amim]OH) worked well as catalysts compared with acidic ionic liquid and inorganic basic catalysts. Subsequent optimization of the reaction conditions using [Bmim]Im as a catalyst led to 98.4% glycerol conversion and up to 100% GC selectivity at 70 ℃ under ambient pressure. The recovery and reuse of these ionic liquids were also satisfactory. [Bmim]Im could be reused three times (i.e., 92.0% glycerol conversion and near 100% GC selectivity). This method exhibited several special features including a simple product isolation procedure, high product yield, exclusive selectivity, and mild conditions, as well as avoiding the use of any toxic catalysts.

Key words: Transesterification, Glycerol, Glycerol carbonate, Basic ionic liquid, Dialkyl carbonate, Platform chemcial