Thermal degradation of diethanolamine at stripper condition for CO2 capture: Product types and reaction mechanisms

doi:10.1016/j.cjche.2018.09.017

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (12): 2900-2908.DOI: 10.1016/j.cjche.2018.09.017

• Separation Science and Engineering • 上一篇下一篇

Thermal degradation of diethanolamine at stripper condition for CO₂ capture: Product types and reaction mechanisms

Idris Mohamed Saeed¹, Brahim Si Ali², Badrul Mohamed Jan², Wan Jefrey Basirun¹, Shaukat Ali Mazari³, Ibrahim Ali Obid Birima¹

1 Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia;
2 Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia;
3 Department of Chemical Engineering, Faculty of Engineering, Dawood University of Engineering and Technology, MA Jinnah Road, Karachi 74800, Pakistan

收稿日期:2018-01-15 修回日期:2018-08-25 出版日期:2019-12-28 发布日期:2020-03-17
通讯作者: Idris Mohamed Saeed, Badrul Mohamed Jan
基金资助:
Supported by the University of Malaya Research Grant (RP038C15HTM, RP020C-14AFR, RP031B-15AFR, IPPP (PG209-2014B)) and the High Impact Research Grant of the University of Malaya (UM.C/625/1/HIR/123).

Thermal degradation of diethanolamine at stripper condition for CO₂ capture: Product types and reaction mechanisms

Idris Mohamed Saeed¹, Brahim Si Ali², Badrul Mohamed Jan², Wan Jefrey Basirun¹, Shaukat Ali Mazari³, Ibrahim Ali Obid Birima¹

1 Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia;
2 Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia;
3 Department of Chemical Engineering, Faculty of Engineering, Dawood University of Engineering and Technology, MA Jinnah Road, Karachi 74800, Pakistan

Received:2018-01-15 Revised:2018-08-25 Online:2019-12-28 Published:2020-03-17
Contact: Idris Mohamed Saeed, Badrul Mohamed Jan
Supported by:
Supported by the University of Malaya Research Grant (RP038C15HTM, RP020C-14AFR, RP031B-15AFR, IPPP (PG209-2014B)) and the High Impact Research Grant of the University of Malaya (UM.C/625/1/HIR/123).

摘要/Abstract

摘要： Amine-based absorption/stripping is one of the promising technology for CO₂ capture from natural and industrial gas streams. During the process, amines and CO₂ undergo irreversible reactions to produce undesired compounds, which cause corrosion, foaming, increased viscosity and breakdown of equipment, ultimately contributing to the economic loss and environmental pollution. In this study, the thermal degradation of aqueous diethanolamine in the presence and absence of dissolved CO₂ was investigated. The experiments were performed in stainless steel cylinders. The results show that thermal degradation in the absence of CO₂ was a slow process; triethanolamine, and tris(2-aminoethyl)amine were only the degradation products identified in the mixture In addition, the rate of degradation was very low, only 3% degradation was observed after 4 weeks. But in the presence of CO₂, sixteen degradation products were identified, nine of which were new degradation products reported for the first time in this study. The 3-(2-hydroxyethyl)-2-oxazolidinone, 1,4-bis(2-hydroxyethyl) piperazine and triethanolamine were the most abundant degradation products. The remaining DEA concentration after 4 weeks was about 20% of the total amine concentration. The most probable degradation reactions and their mechanisms are also proposed.

关键词: Diethanolamine, CO₂ capture, Degradation, Mechanism

Abstract: Amine-based absorption/stripping is one of the promising technology for CO₂ capture from natural and industrial gas streams. During the process, amines and CO₂ undergo irreversible reactions to produce undesired compounds, which cause corrosion, foaming, increased viscosity and breakdown of equipment, ultimately contributing to the economic loss and environmental pollution. In this study, the thermal degradation of aqueous diethanolamine in the presence and absence of dissolved CO₂ was investigated. The experiments were performed in stainless steel cylinders. The results show that thermal degradation in the absence of CO₂ was a slow process; triethanolamine, and tris(2-aminoethyl)amine were only the degradation products identified in the mixture In addition, the rate of degradation was very low, only 3% degradation was observed after 4 weeks. But in the presence of CO₂, sixteen degradation products were identified, nine of which were new degradation products reported for the first time in this study. The 3-(2-hydroxyethyl)-2-oxazolidinone, 1,4-bis(2-hydroxyethyl) piperazine and triethanolamine were the most abundant degradation products. The remaining DEA concentration after 4 weeks was about 20% of the total amine concentration. The most probable degradation reactions and their mechanisms are also proposed.

Key words: Diethanolamine, CO₂ capture, Degradation, Mechanism

Idris Mohamed Saeed, Brahim Si Ali, Badrul Mohamed Jan, Wan Jefrey Basirun, Shaukat Ali Mazari, Ibrahim Ali Obid Birima. Thermal degradation of diethanolamine at stripper condition for CO₂ capture: Product types and reaction mechanisms[J]. 中国化学工程学报, 2019, 27(12): 2900-2908.

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Thermal degradation of diethanolamine at stripper condition for CO₂ capture: Product types and reaction mechanisms

Thermal degradation of diethanolamine at stripper condition for CO₂ capture: Product types and reaction mechanisms

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