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Thermal degradation of monoethanolamine and its effect on CO2 capture capacity.

Zoannou, Kali-Stella, Sapsford, Devin James ORCID: and Griffiths, Anthony John 2013. Thermal degradation of monoethanolamine and its effect on CO2 capture capacity. International Journal of Greenhouse Gas Control 17 , pp. 423-430. 10.1016/j.ijggc.2013.05.026

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Amine scrubbing is a proven technology in the oil and gas industries. Its use in coal fired power plants is not fully understood and the likelihood of solvent degradation is high. Decreased absorption efficiency, undesirable by-products and the environmental impact of their disposal are the main consequences. In the present study, samples of monoethanolamine were thermally degraded, at 160 °C for between 2 and 8 weeks, and their CO2 removal capacity deterioration was determined. The findings show that thermal degradation at 160 °C for 8 weeks reduced monoethanolamine concentration by 95%, but the remaining solvent still retained 22% of its capacity to remove CO2, probably due to the capacity of some of the degradation products to remove CO2. Therefore, the requirement for monoethanolamine make-up in operational amine scrubbing systems may not be quite as serious as initially believed. A 20% higher MEA loss was determined in the samples with 0.37 initial CO2 loading (mol CO2/mol MEA). 2-Oxazolidone, N-(2-hydroxyethyl)-ethylenediamine and 1-(2-hydroxyethyl)-2-imidazolidinone were identified as the major monoethanolamine degradation products, the latter being indicated as the most stable product with concentrations of up to 17% (v/v). Corrosion (1.95 mm/year) of the stainless steel (type 316) equipment, used during the experiments, was also observed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
Uncontrolled Keywords: Thermal degradation; MEA; Monoethanolamine; CO2 capture
Publisher: Elsevier
ISSN: 1750-5836
Date of First Compliant Deposit: 18 August 2016
Last Modified: 29 Oct 2022 10:45

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