新型固载离子液体在碳酸丙烯酯水解反应中的应用

摘要

Immobilized ionic liquid catalyst（IL-Ala/SiO2）was prepared by sol-gel method with L-alanine as raw material and SiO2 as a supporter.This catalyst was characterized by FTIR,TG,13C NMR,1H NMR,XRD and TEM.Catalytic properties were studied in propylene carbonate（PC） hydrolysis.The results show that immobilized ionic liquid catalyst can efficiently catalyze propylene carbonate hydrolysis to produce 1,2-propylene glycol（PG）.Reaction occurred under normal pressure,which could avoid a high pressure condition.The conversion rate of PC and the selectivity of PG were greater than 99% when catalyst weight content was 9%,reaction temperature was 140 ℃,and reaction time was 3.5 h.The catalyst could be used at least 5 times through simple separation and its activity only slightly changed.%以L-丙氨酸为原料采用溶胶-凝胶法制备了以SiO2为载体的固载化离子液体催化剂（IL-Ala/SiO2）。用红外光谱（FTIR）、热重（TG）、13C NMR、1H NMR、XRD和TEM等测试技术进行了表征,考察了催化剂在碳酸丙烯酯（PC）水解反应中的催化性能。结果表明,该催化剂在常压下能有效催化碳酸丙烯酯水解生成1,2-丙二醇（PG）。在催化剂含量为9%（质量分数）、温度140℃、反应时间3.5 h的条件下,PC的转化率大于99%,PG的选择性大于99%。经简单分离后催化剂可重复使用5次而活性变化不大。