Esterification of acetic acid with isobutanol catalyzed by ionic liquid n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate: Experimental and kinetic study

doi:10.1016/j.cjche.2023.04.022

中国化学工程学报 ›› 2023, Vol. 63 ›› Issue (11): 21-30.DOI: 10.1016/j.cjche.2023.04.022

• Full Length Article • 上一篇下一篇

Esterification of acetic acid with isobutanol catalyzed by ionic liquid n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate: Experimental and kinetic study

Meng Shi, Kelei Huang, Ruining He, Yinghua Jiang, Yun Zou, Jing Xu, Zhangfa Tong

Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

收稿日期:2022-12-22 修回日期:2023-04-11 出版日期:2023-11-28 发布日期:2024-01-08
通讯作者: Zhangfa Tong,E-mail:zftong@gxu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (22168004), the Natural Science Foundation of Guangxi Province (2017GXNSFDA198047), and the Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (2019Z010, 2021Z013).

Esterification of acetic acid with isobutanol catalyzed by ionic liquid n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate: Experimental and kinetic study

Meng Shi, Kelei Huang, Ruining He, Yinghua Jiang, Yun Zou, Jing Xu, Zhangfa Tong

Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

Received:2022-12-22 Revised:2023-04-11 Online:2023-11-28 Published:2024-01-08
Contact: Zhangfa Tong,E-mail:zftong@gxu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (22168004), the Natural Science Foundation of Guangxi Province (2017GXNSFDA198047), and the Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (2019Z010, 2021Z013).

摘要/Abstract

摘要： As an important organic, isobutyl acetate (IbAc) has been widely used in industries because of its good biodegradability, low surface tension, and other properties. The industrial production of IbAc is usually catalyzed by sulfuric acid. However, the use of sulfuric acid has the drawbacks of causing considerable corrosion to equipment and being difficult to be separated. In this work, n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate ([HSO₃-PMPY][CF₃SO₃]) Brönsted acidic ionic liquid (BAIL) was used as the catalyst and the catalytic activity, solubility, and corrosiveness were evaluated for the esterification of acetic acid with isobutanol. The reaction kinetics and chemical equilibrium were systemically studied. Compared to conventional acid catalysts, [HSO₃-PMPY][CF₃SO₃] showed higher catalytic activity, more excellent reusability, more favorable phase separation, and non-corrosiveness. Three kinetic equations based on ideal homogeneous (IH), non-ideal homogeneous (NIH), and modified non-ideal homogeneous (NIH-M) models were established and correlated with the experimental data to determine the parameters and errors. The NIH-M model exhibited the best agreement with the experimental data, owing to its prediction considering the non-ideality and the self-catalysis effect of acetic acid in this system. Besides, the error of NIH-M model fitting was mainly caused by the difference in solubility between [HSO₃-PMPY][CF₃SO₃] with reactants and products in the reaction system. Furthermore, the applicability of the NIH-M model was investigated by simulating the esterification of acetic acid with three short-chain alcohols (ethanol, n-butanol, and isobutanol) catalyzed by BAILs. The NIH-M model displayed an acceptable simulation for this type of acetic acid esterification reaction catalyzed by BAILs at different ranges of the BAILs concentration and temperature. This study confirmed the industrial prospects of [HSO₃-PMPY][CF₃SO₃] in isobutyl acetate production and the applicability of the NIH-M kinetic model in the esterification of acetic acid.

关键词: Esterification, Isobutyl acetate, Ionic liquid, Kinetics

Abstract: As an important organic, isobutyl acetate (IbAc) has been widely used in industries because of its good biodegradability, low surface tension, and other properties. The industrial production of IbAc is usually catalyzed by sulfuric acid. However, the use of sulfuric acid has the drawbacks of causing considerable corrosion to equipment and being difficult to be separated. In this work, n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate ([HSO₃-PMPY][CF₃SO₃]) Brönsted acidic ionic liquid (BAIL) was used as the catalyst and the catalytic activity, solubility, and corrosiveness were evaluated for the esterification of acetic acid with isobutanol. The reaction kinetics and chemical equilibrium were systemically studied. Compared to conventional acid catalysts, [HSO₃-PMPY][CF₃SO₃] showed higher catalytic activity, more excellent reusability, more favorable phase separation, and non-corrosiveness. Three kinetic equations based on ideal homogeneous (IH), non-ideal homogeneous (NIH), and modified non-ideal homogeneous (NIH-M) models were established and correlated with the experimental data to determine the parameters and errors. The NIH-M model exhibited the best agreement with the experimental data, owing to its prediction considering the non-ideality and the self-catalysis effect of acetic acid in this system. Besides, the error of NIH-M model fitting was mainly caused by the difference in solubility between [HSO₃-PMPY][CF₃SO₃] with reactants and products in the reaction system. Furthermore, the applicability of the NIH-M model was investigated by simulating the esterification of acetic acid with three short-chain alcohols (ethanol, n-butanol, and isobutanol) catalyzed by BAILs. The NIH-M model displayed an acceptable simulation for this type of acetic acid esterification reaction catalyzed by BAILs at different ranges of the BAILs concentration and temperature. This study confirmed the industrial prospects of [HSO₃-PMPY][CF₃SO₃] in isobutyl acetate production and the applicability of the NIH-M kinetic model in the esterification of acetic acid.

Key words: Esterification, Isobutyl acetate, Ionic liquid, Kinetics

Meng Shi, Kelei Huang, Ruining He, Yinghua Jiang, Yun Zou, Jing Xu, Zhangfa Tong. Esterification of acetic acid with isobutanol catalyzed by ionic liquid n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate: Experimental and kinetic study[J]. 中国化学工程学报, 2023, 63(11): 21-30.

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Esterification of acetic acid with isobutanol catalyzed by ionic liquid n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate: Experimental and kinetic study

Esterification of acetic acid with isobutanol catalyzed by ionic liquid n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate: Experimental and kinetic study

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