Preparation and performance analysis of non-aqueous absorbents based on alcohol ether organic compounds for CO2 capture

doi:10.1016/j.cjche.2025.07.019

Chinese Journal of Chemical Engineering ›› 2025, Vol. 88 ›› Issue (12): 284-295.DOI: 10.1016/j.cjche.2025.07.019

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Preparation and performance analysis of non-aqueous absorbents based on alcohol ether organic compounds for CO₂ capture

Yi Wang¹, Yucong Ge¹, Li Yang¹, Fang Liu¹, Qingfang Li², Yi Li², Kunlei Liu^3,4

1. School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;
2. Sinopec Petroleum Engineering Co., Ltd., Dongying 257000, China;
3. University of Kentucky, Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, USA;
4. University of Kentucky, Department of Mechanical Engineering, Lexington, KY 40506, USA

Received:2025-04-13 Revised:2025-06-25 Accepted:2025-07-28 Online:2025-09-26 Published:2026-02-09
Contact: Li Yang,E-mail:li.yang@cumt.edu.cn
Supported by:
This work was supported by National Key Research and Development Program (2022YFE0130000), the Xuzhou Science and Technology Plan Project (KC23077), the Fundamental Research Funds for the Central Universities (2023KYJD1005), and the Natural Science Foundation of Jiangsu Province (BK20240208).

Preparation and performance analysis of non-aqueous absorbents based on alcohol ether organic compounds for CO₂ capture

Yi Wang¹, Yucong Ge¹, Li Yang¹, Fang Liu¹, Qingfang Li², Yi Li², Kunlei Liu^3,4

1. School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;
2. Sinopec Petroleum Engineering Co., Ltd., Dongying 257000, China;
3. University of Kentucky, Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, USA;
4. University of Kentucky, Department of Mechanical Engineering, Lexington, KY 40506, USA

通讯作者: Li Yang,E-mail:li.yang@cumt.edu.cn
基金资助:
This work was supported by National Key Research and Development Program (2022YFE0130000), the Xuzhou Science and Technology Plan Project (KC23077), the Fundamental Research Funds for the Central Universities (2023KYJD1005), and the Natural Science Foundation of Jiangsu Province (BK20240208).

Abstract

Abstract: MEA aqueous solution is widely utilized as an absorbent in chemical absorption processes. However, it is challenged by many disadvantages, including low regeneration capacity and high energy consumption during regeneration. In this study, new no-aqueous MEA absorbents were prepared using alcohol ether organic solvents, including proprylene glycol monomethyl ether (PGME), ethylene glycol butyl ether (EGBE), poly (ethylene glycol) dimethyl ether (NHD) and diethylene glycol monoethyl Ether (DGME). Then the performance of the absorbents was assessed through a series of experiments and based on the results, a comparison was made between the non-aqueous absorbents to the conventional absorbent (30% (mass) MEA aqueous solution). It was found that the organic solvent system presented a higher CO₂ removal efficiency than the MEA-H₂O system in the first 350 s, with the maximum enhancement ranging from 5.16% to 14.36%. While NHD improved the CO₂ loading but reduced the regeneration efficiency. Except for the MEA-NHD system, all the other no-aqueous absorbents possessed a better regeneration efficiency than the MEA aqueous solution, which offers them the potential for industrial application. According to the data from NMR and FTIR analysis, after CO₂ absorption, the products in the MEA-EGBE and MEA-DGME systems were mainly found in the lower phase, the other phase was mainly organic solvents. Therefore, only the lower phase needs to be treated during desorption, with the upper phase being recycled directly, thus reducing energy consumption. The use of alcohol ether organic solvents can improve the CO₂ capture performance of absorbents to a certain extent and enhance their regeneration ability, providing a new direction for the subsequent research of non-aqueous absorbents.

Key words: CO₂ capture, Regeneration efficiency, MEA, Non-aqueous absorbent, Cyclic capacity

摘要： MEA aqueous solution is widely utilized as an absorbent in chemical absorption processes. However, it is challenged by many disadvantages, including low regeneration capacity and high energy consumption during regeneration. In this study, new no-aqueous MEA absorbents were prepared using alcohol ether organic solvents, including proprylene glycol monomethyl ether (PGME), ethylene glycol butyl ether (EGBE), poly (ethylene glycol) dimethyl ether (NHD) and diethylene glycol monoethyl Ether (DGME). Then the performance of the absorbents was assessed through a series of experiments and based on the results, a comparison was made between the non-aqueous absorbents to the conventional absorbent (30% (mass) MEA aqueous solution). It was found that the organic solvent system presented a higher CO₂ removal efficiency than the MEA-H₂O system in the first 350 s, with the maximum enhancement ranging from 5.16% to 14.36%. While NHD improved the CO₂ loading but reduced the regeneration efficiency. Except for the MEA-NHD system, all the other no-aqueous absorbents possessed a better regeneration efficiency than the MEA aqueous solution, which offers them the potential for industrial application. According to the data from NMR and FTIR analysis, after CO₂ absorption, the products in the MEA-EGBE and MEA-DGME systems were mainly found in the lower phase, the other phase was mainly organic solvents. Therefore, only the lower phase needs to be treated during desorption, with the upper phase being recycled directly, thus reducing energy consumption. The use of alcohol ether organic solvents can improve the CO₂ capture performance of absorbents to a certain extent and enhance their regeneration ability, providing a new direction for the subsequent research of non-aqueous absorbents.

关键词: CO₂ capture, Regeneration efficiency, MEA, Non-aqueous absorbent, Cyclic capacity

Yi Wang, Yucong Ge, Li Yang, Fang Liu, Qingfang Li, Yi Li, Kunlei Liu. Preparation and performance analysis of non-aqueous absorbents based on alcohol ether organic compounds for CO₂ capture[J]. Chinese Journal of Chemical Engineering, 2025, 88(12): 284-295.

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Preparation and performance analysis of non-aqueous absorbents based on alcohol ether organic compounds for CO₂ capture

Preparation and performance analysis of non-aqueous absorbents based on alcohol ether organic compounds for CO₂ capture

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