Glycerol acetalization with formaldehyde using water-tolerant solid acids

The acid-catalyzed reaction of glycerol with aqueous formaldehyde was studied using various heterogeneous catalysts for the production of glycerol formal. Owing to the high amount of water involved in the reaction medium, three types of water-tolerant heterogeneous catalysts namely acid functionalized periodic mesoporous organosilicas (PMOs), zeolite ZSM-5 and a heteropoly compound Cs2.5H0.5PW12O40 as well as commercial catalyst Amberlyst-15 were used for glycerol acetalization. The activity of Cs2.5H0.5PW12O40 was found superior to that of the other catalysts and the glycerol conversion was over 70% within 60 min of reaction time. The effects of different parameters including temperature, feed,composition and catalyst content, were studied as well. The distribution of the two glycerol formal isomers could be controlled by changing reaction parameters. Optimum reactive parameters were studied to control the distribution of the acetal isomers aiming to reach a high selectivity to the six-member ring isomer. (C) 2015 Elsevier B.V. All rights reserved.

使用多种非均相催化剂研究了甘油与甲醛水溶液的酸催化反应，以生产甘油缩甲醛。由于反应介质中含水量高，使用了三种耐水的非均相催化剂，即酸功能化的周期性介孔有机硅（PMOs）、ZSM - 5沸石和杂多化合物Cs2.5H0.5PW12O40以及商业催化剂Amberlyst - 15用于甘油缩醛化反应。发现Cs2.5H0.5PW12O40的活性优于其他催化剂，在反应60分钟内甘油转化率超过70%。还研究了包括温度、原料组成和催化剂含量等不同参数的影响。通过改变反应参数可以控制两种甘油缩甲醛异构体的分布。研究了最佳反应参数以控制缩醛异构体的分布，旨在提高对六元环异构体的选择性。（C）2015爱思唯尔有限公司。保留所有权利。