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Forced degradation of AEEA under full CO2 loading, high temperature and high O2 partial pressure conditions: Degradation reaction pathway and degradation inhibitor studies.

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Title: Forced degradation of AEEA under full CO2 loading, high temperature and high O2 partial pressure conditions: Degradation reaction pathway and degradation inhibitor studies.
Authors: Lu, Shijian1,2,3 (AUTHOR) lushijian88@163.com, Ma, Yanhui1,2,3 (AUTHOR), Kang, Guojun1,2,3 (AUTHOR), Liu, Ling1,2,3 (AUTHOR) liuling@cumt.edu.cn, Luo, Yimeng1,2,3 (AUTHOR), Mei, Jieqiong1,2,3 (AUTHOR), Sun, Mengyuan1,2,3 (AUTHOR), Zhu, Wenju1,2,3 (AUTHOR), Yang, Fei1,2,3 (AUTHOR), Huang, Zhigang1,2,3 (AUTHOR)
Source: Separation & Purification Technology. Aug2025:Part 1, Vol. 363, pN.PAG-N.PAG. 1p.
Subjects: Carbon sequestration, Partial pressure, Carbon dioxide, Free radicals, High temperatures, Thymol
Abstract: Organic amine absorbents are susceptible to degradation during the CO 2 capture process, resulting in the loss of amine absorbents and increased trapping costs. Compared with traditional MEA absorbents, AEEA has the advantages of high CO 2 absorption capacity and good cyclic stability. However, studies on the degradation of AEEA and AEEA-based absorbents are limited. Phenolic and oligosaccharide macromolecules with active hydroxyl groups were used as degradation inhibitors in AEEA systems, and forced degradation experiments were carried out for AEEA. The CO 2 trapping performance, amine degradation rate, and physicochemical properties of AEEA with degradation time were investigated at high temperatures and high O 2 partial pressures. Changes in the types and contents of possible degradation products were analysed, and possible pathways for degradation products and mechanisms of action for degradation inhibitors were speculated. Compared with the blank sample, the addition of 0.1 vt% thymol significantly increased the AEEA concentration, and the CO 2 absorption and desorption capacities increased by a maximum of 188.82 % and 70.15 %, respectively. 1-(2-Hydroxyethyl)-2-imidazolidinone (HEIA) and 2,5-piperidinedion were the main degradation products of AEEA before and after the addition of degradation inhibitors. The joint action of phenolic hydroxyl ortho- and para-substituents renders the H of OH bonds on thymol susceptible to detachment. This enhances the capacity of thymol to capture reactive free radicals, including peroxide free radicals, within a solution. The objectives are to terminate the AEEA automatic oxidation chain reaction, and inhibit AEEA degradation, thereby providing strong technical support for the wide application of AEEA. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Organic amine absorbents are susceptible to degradation during the CO 2 capture process, resulting in the loss of amine absorbents and increased trapping costs. Compared with traditional MEA absorbents, AEEA has the advantages of high CO 2 absorption capacity and good cyclic stability. However, studies on the degradation of AEEA and AEEA-based absorbents are limited. Phenolic and oligosaccharide macromolecules with active hydroxyl groups were used as degradation inhibitors in AEEA systems, and forced degradation experiments were carried out for AEEA. The CO 2 trapping performance, amine degradation rate, and physicochemical properties of AEEA with degradation time were investigated at high temperatures and high O 2 partial pressures. Changes in the types and contents of possible degradation products were analysed, and possible pathways for degradation products and mechanisms of action for degradation inhibitors were speculated. Compared with the blank sample, the addition of 0.1 vt% thymol significantly increased the AEEA concentration, and the CO 2 absorption and desorption capacities increased by a maximum of 188.82 % and 70.15 %, respectively. 1-(2-Hydroxyethyl)-2-imidazolidinone (HEIA) and 2,5-piperidinedion were the main degradation products of AEEA before and after the addition of degradation inhibitors. The joint action of phenolic hydroxyl ortho- and para-substituents renders the H of OH bonds on thymol susceptible to detachment. This enhances the capacity of thymol to capture reactive free radicals, including peroxide free radicals, within a solution. The objectives are to terminate the AEEA automatic oxidation chain reaction, and inhibit AEEA degradation, thereby providing strong technical support for the wide application of AEEA. [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2025.132010