固载化离子液体催化碳酸乙烯酯水解制备乙二醇

›› 2009, Vol. 9 ›› Issue (5): 904-909.

固载化离子液体催化碳酸乙烯酯水解制备乙二醇

王耀红成卫国孙剑张香平张锁江

中国科学院过程工程研究所多相复杂国家重点实验室中国科学院过程工程研究所中国科学院过程工程研究所中国科学院过程工程研究所中国科学院过程工程研究所

收稿日期:2009-03-17 修回日期:2009-05-20 出版日期:2009-10-20 发布日期:2009-10-20
通讯作者: 张香平

Synthesis of Ethylene Glycol via Hydrolysis of Ethylene Carbonate Catalyzed by Immobilized Ionic liquid

WANG Yao-hong CHENG Wei-guo SUN Jian ZHANG Xiang-ping ZHANG Suo-jiang

Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Institute of process Engineering, CAS Institute of Process Engineering, CAS

Received:2009-03-17 Revised:2009-05-20 Online:2009-10-20 Published:2009-10-20
Contact: ZHANG Xiang-ping

摘要/Abstract

摘要： 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，并将其首次用于催化碳酸乙烯酯(EC)水解制备乙二醇(EG)的反应. 结果表明，固载化碱性离子液体S-[bpim][HCO3]对碳酸乙烯酯水解制EG反应具有良好的催化活性和EG选择性，克服了非均相催化剂活性不高与均相催化剂难以分离的不足. 在催化剂浓度为0.0511 g/mL、温度140℃、压力0.4 MPa及EC/H2O=1:2(摩尔比)、反应时间3 h的条件下，EC转化率达99.7%，EG选择性为100%. 该催化剂在循环使用5次后，EC转化率无明显下降，EG的选择性始终接近100%.

关键词: 碳酸乙烯酯, 水解, 离子液体, 固载, 乙二醇

Abstract: The SiO2 immobilized ionic liquid catalyst S-[bpim]Br was prepared through sol-gel method. By treatment of S-[bpim]Br with potassium hydrogen carbonate, S-[bpim][HCO3] was obtained. Then, the catalytic activity of SiO2 immobilized ionic liquid in the synthesis of ethylene glycol (EG) via hydrolysis of ethylene carbonate (EC) was studied. The results showed that the immobilized basic ionic liquid S-[bpim][HCO3] exhibited good performance on the hydrolysis of ethylene carbonate and could be separated easily from the reaction system. Moreover, the effects of temperature, molar ratio of EC to H2O, reaction pressure, reaction time, and content of catalyst were also investigated in detail. The optimal reaction conditions were determined as follows: reaction temperature 140℃, reaction pressure 0.4 MPa, molar ratio of water to ethylene carbonate 2:1 and reaction time 3 h. Under above conditions, 99.7% EC conversion rate and 100% EG selectivity were obtained. Additionally, the catalyst could be reused at least 5 times with slight loss of its activity.

Key words: ethylene carbonate, hydrolysis, ionic liquids, immobilization, ethylene glycol

中图分类号:

TQ223.1

王耀红成卫国孙剑张香平张锁江. 固载化离子液体催化碳酸乙烯酯水解制备乙二醇[J]. , 2009, 9(5): 904-909.

WANG Yao-hong CHENG Wei-guo SUN Jian ZHANG Xiang-ping ZHANG Suo-jiang. Synthesis of Ethylene Glycol via Hydrolysis of Ethylene Carbonate Catalyzed by Immobilized Ionic liquid[J]. , 2009, 9(5): 904-909.

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