Highly efficient CO2 capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale

doi:10.1016/j.cjche.2023.11.006

中国化学工程学报 ›› 2024, Vol. 67 ›› Issue (3): 148-156.DOI: 10.1016/j.cjche.2023.11.006

Highly efficient CO₂ capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale

Kun Li^1,2, Han Tang¹, Shuangshuang Li¹, Zixuan Huang¹, Bei Liu¹, Chun Deng¹, Changyu Sun¹, Guangjin Chen¹

1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
2 Zhejiang Tiandi Environmental Protection Technology Co., Ltd., Hangzhou 310012, China

收稿日期:2023-05-31 修回日期:2023-11-20 出版日期:2024-03-28 发布日期:2024-06-01
通讯作者: Bei Liu,E-mail address:liub@cup.edu.cn;Guangjin Cheng,E-mail address:jchen@cup.edu.cn.
基金资助:
The financial supports received from National Natural Science Foundation of China (U20B6005, 22178378, and 22127812) are gratefully acknowledged. In addition, Kun Li wants to thank, in particular, the great support and encourage from Shuangshuang Li. Looking forward to a bright future with you.

Highly efficient CO₂ capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale

Kun Li^1,2, Han Tang¹, Shuangshuang Li¹, Zixuan Huang¹, Bei Liu¹, Chun Deng¹, Changyu Sun¹, Guangjin Chen¹

1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
2 Zhejiang Tiandi Environmental Protection Technology Co., Ltd., Hangzhou 310012, China

Received:2023-05-31 Revised:2023-11-20 Online:2024-03-28 Published:2024-06-01
Contact: Bei Liu,E-mail address:liub@cup.edu.cn;Guangjin Cheng,E-mail address:jchen@cup.edu.cn.
Supported by:
The financial supports received from National Natural Science Foundation of China (U20B6005, 22178378, and 22127812) are gratefully acknowledged. In addition, Kun Li wants to thank, in particular, the great support and encourage from Shuangshuang Li. Looking forward to a bright future with you.

摘要/Abstract

摘要： To date, the primary industrial carbon capture approach is still absorption using aqueous solutions of alkanolamines. Here, to pursue a substitute for the amine-based approach to improve the CO₂ capture efficiency and decrease the energy cost further, we report a new carbon capture approach using a 2-methylimidazole (mIm) aqueous solution. The properties and sorption behaviors of this approach have been experimentally investigated. The results show that the mIm solution has higher CO₂ absorption capacity under relatively higher equilibrium pressure (>130 kPa) and lower desorption heat than the methyldiethanolamine solution. 91.6% sorption capacity of mIm solution can be recovered at 353.15 K and 80 kPa. The selectivity for CO₂/N₂ and CO₂/CH₄ can reach an exceptional 7609 and 4324, respectively. Furthermore, the pilot-scale tests were also performed, and the results demonstrate that more than 98% of CO₂ in the feed gas could be removed and cyclic absorption capacity can reach 1 mol·L^-1. This work indicates that mIm is an excellent alternative to alkanolamines for carbon capture in the industry.

关键词: CO₂ capture, Absorption, 2-Methylimidazole, Separation, Pilot-scale tests

Abstract: To date, the primary industrial carbon capture approach is still absorption using aqueous solutions of alkanolamines. Here, to pursue a substitute for the amine-based approach to improve the CO₂ capture efficiency and decrease the energy cost further, we report a new carbon capture approach using a 2-methylimidazole (mIm) aqueous solution. The properties and sorption behaviors of this approach have been experimentally investigated. The results show that the mIm solution has higher CO₂ absorption capacity under relatively higher equilibrium pressure (>130 kPa) and lower desorption heat than the methyldiethanolamine solution. 91.6% sorption capacity of mIm solution can be recovered at 353.15 K and 80 kPa. The selectivity for CO₂/N₂ and CO₂/CH₄ can reach an exceptional 7609 and 4324, respectively. Furthermore, the pilot-scale tests were also performed, and the results demonstrate that more than 98% of CO₂ in the feed gas could be removed and cyclic absorption capacity can reach 1 mol·L^-1. This work indicates that mIm is an excellent alternative to alkanolamines for carbon capture in the industry.

Key words: CO₂ capture, Absorption, 2-Methylimidazole, Separation, Pilot-scale tests

Kun Li, Han Tang, Shuangshuang Li, Zixuan Huang, Bei Liu, Chun Deng, Changyu Sun, Guangjin Chen. Highly efficient CO₂ capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale[J]. 中国化学工程学报, 2024, 67(3): 148-156.

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Highly efficient CO₂ capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale

Highly efficient CO₂ capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale

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