Preparation of supported ionic liquid [HSO3-BMIM][HSO4]/SiO2 and its catalytic property in the esterification of acetic acid and ethanol

被引：0
|
作者：
He R. [1 ]
Zou Y. [1 ]
Shi M. [1 ]
Li Y. [1 ]
Xu J. [1 ]
Tong Z. [1 ]
机构：
[1] Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Guangxi, Nanning
来源：
Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 09期
关键词：
catalyst; esterification; ethyl acetate; immobilization; ionic liquid; supported acid;
D O I：
10.11949/0438-1157.20220456
中图分类号：
学科分类号：
摘要：
In order to make the ionic liquids (ILs) easier to separate and recycle while maintaining the catalytic activity, and to reduce the corrosion, a variety of supported ILs were prepared to catalyze the esterification for the synthesis of ethyl acetate (EtAc). The supported ILs are analyzed and characterization by infrared spectroscopy, thermogravimetric, nitrogen adsorption-desorption and scanning electron microscopy. It is found that sol-gel method can immobilize ILs on SiO2 more effectively than impregnation. In the conditions of RA0∶E = 1, T in the range of 323.15—338.15 K, and xcat∶HAc in the range of 5%—15%, the supported IL [HSO3-BMIM] [HSO4]/SiO2 which prepare by sol-gel method shows fast reaction rate, the conversion of acetic acid (XHAc) exceeds 50% at the first 30 min, which achieves 70% of the equilibrium conversion (XHAc = 68%). The LHHW model was used to fit the rate of [HSO3-BMIM] [HSO4]/SiO2-catalyzed esterification reaction, and the results showed that the model predicted accurately. The repeatability experimental result showed that XHAc (t = 4 h) of [HSO3-BMIM][HSO4]/SiO2 in the third run exceeded 60%, which decreased at the 6th run. The catalytic activity and stability of supported IL prepared by sol-gel method are better than that of impregnation. These results show that sol-gel method is more suitable for the preparation of supported ILs. © 2022 Chemical Industry Press. All rights reserved.
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页码：3880 / 3894
页数：14
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