Preparation of diglycerol from glyerol by acid-base synergistic catalysis

被引：0
|
作者：
Qian X. [1 ]
Chen Q.-X. [1 ]
Wang L. [1 ]
Wang Z.-H. [1 ]
Lu X.-H. [1 ]
Ji J.-B. [1 ]
机构：
[1] Zhejiang Province Key Laboratory of Biofuel, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou
来源：
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2019年 / 33卷 / 02期
关键词：
Acid-base synergistic catalysis; Al[!sub]2[!/sub]O[!sub]3[!/sub; Diglycerol; K[!sub]2[!/sub]CO[!sub]3[!/sub; Polymerization kinetics;
D O I：
10.3969/j.issn.1003-9015.2019.02.014
中图分类号：
学科分类号：
摘要：
In order to improve diglycerol selectivity and yield from glycerol etherification, a method for diglycerol preparation by acid-base synergistic catalysis was proposed. K2CO3 was first used as the catalyst and the process conditions were optimized by single factor and orthogonal experiments under reaction temperature 230℃, catalyst dosage (K2CO3) 2.7 g and reaction time 3 h. Acid (active Al2O3)-base (K2CO3) synergistic catalysis and glycerol polymerization kinetics were studied under the optimized process conditions. Compared with base catalysis, acid-base synergistic catalysis can increase glycerol conversion from 30.4% to 39.4% and diglycerol yield from 23.0% to 30.2%. The activation energy of glycerol to diglycerol decreases from 137.11 to 123.35 kJ∙mol-1. The results show that acid-base synergistic catalysis is superior to single base catalysis. © 2019, Editorial Board of "Journal of Chemical Engineering of Chinese Universities". All right reserved.
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页码：364 / 371
页数：7
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