聚2-丙烯酰胺基-2-甲基丙磺酸水凝胶催化酯化反应研究

Application of poly(2-acrylamido-2-methyl propane sulfonic acid) hydrogel in catalyzing esterification reaction

为提高酯化反应转化率,减少传统催化剂对环境的污染,采用聚2-丙烯酰胺基-2-甲基丙磺酸(PAMPS)水凝胶代替传统浓硫酸及酸性催化剂催化酯化反应。通过考察凝胶的溶胀性能,探讨了凝胶对乙酸乙酯合成反应的催化性能的影响。研究表明,PAMPS凝胶能有效去除酯化反应中的副产物(水),凝胶对酯化反应的催化效率达到89%,接近浓硫酸,而远比氨基磺酸高。经重复使用5次后,PAMPS凝胶的催化活性没有明显下降。

To increase the conversion of esterification and inhibit the harmfulness of conventional catalyst to the environment,this work develops the poly（2-acrylamido-2-methyl propane sulfonic acid）（PAMPS）hydrogel as the alternative of concentrated sulfuric acid and aminosulfonic acid to catalyze esterification.The effect of hydro-gel on catalytic efficiency of ethyl acetate synthesis was investigated by the evaluation of swelling behavior of hydrogel.The results indicate that the byproduct （water）in the reaction process can be effectively removed due to the hydration capability of PAMPS hydrogel for water molecules.The catalytic efficiency of hydrogel on the esterification reaches to 89% that was close to the catalytic efficiency of concentrated sulfuric acid,whereas the value was substantially higher than that of aminosulfonic acid.Catalysis activation of PAMPS hydrogel was still retained after the repeated usage of five times.