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Chemcial Industry and Engineering 2017, Vol. 34 Issue (5) :55-60    DOI: 10.13353/j.issn.1004.9533.20151080
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Synthesis of L-Lactide Catalyzed by Brönsted-Lewis Acidic Ionic Liquids
Jiang Bin1,2, Tantai Xiaowei1, Xiao Xiaoming1, Deng lin1, Zhao Qiudi3, Li Nannan3
1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. National Engineering Research Center of Distillation Technology, Tianjin University, Tianjin 300072, China;
3. Beiyang National Distillation Technology Corporation Limited Co., Tianjin 300072, China

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Abstract 

L-Lactide is an important intermediate in the industrial production of PLA. Brönsted-Lewis acid ionic liquids (ILs) [HSO3-bmim]Cl-SnCl2 with different molar fractions of tin(Ⅱ) chloride were successfully prepared, and applied for the preparation of L-Lactide by the prepolymer route. The effects of different amounts of SnCl2 on catalytic reactivity were studied. The influences of various reaction parameters, such as the dosage of catalysts, reaction temperature, and reaction time, were investigated. Owing to the reutilization of PLLA residue and ILs catalyst, the reiterative lactide synthesis was realized. The recycled catalyst showed no notable loss of activity for 3 circles. Meanwhile, high-quality L-lactide could be selectively produced in high yield (90.99%~92.64%, based on L-lactic acid replenished).

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Articles by authors
Jiang Bin
Tantai Xiaowei
Xiao Xiaoming
Deng lin
Zhao Qiudi
Li Nannan
KeywordsBrönsted-Lewis acid ionic liquids;   catalysis;   L-Lactide;   synthesis;   reactivity;   recycle of residues     
Received 2015-04-12;
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Jiang Bin, Tantai Xiaowei, Xiao Xiaoming, Deng lin, Zhao Qiudi, Li Nannan.Synthesis of L-Lactide Catalyzed by Brönsted-Lewis Acidic Ionic Liquids[J]  Chemcial Industry and Engineering, 2017,V34(5): 55-60
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