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Comparison of ammonia, monoethanolamine and methyldiethanolamine solvents to capture CO 2

Carol Toro Molina 1 Chakib Bouallou 1 
1 CEP/Paris
CEP - Centre Énergétique et Procédés
Abstract : This work presents a comparison of CO 2 absorption by ammonia solvent in terms of kinetics, absorption capacity and heat duty with respect to more traditional alkanolamines solvents, such as monoethanolamine (MEA) and methyldiethanolamine (MDEA). Ammonia has the advantage over amines respecting high absorption capacity, oxidative resistance and thermal degradation. However, ammonia losses can be large due to its high vapor pressure. Experiments are carried out in a thermoregulated Lewis-type cell reactor in temperatures ranging from 278 to 303 K and mass concentrations from 2 wt% to 5 wt%. Furthermore, the CO 2 capture is simulated with the software Aspen plus™ for a pulverised coal fired power plant (CF). The results show that carbon dioxide absorption by ammonia is faster than that carried out by MDEA and blend amines (MDEA MEA), while MEA is the most reactive solvent studied. With regard to post-combustion, the process simulation shows that the heat duty for NH 3 is lower than this of MEA and MDEA. The energy consumption reaches 2.83 GJ/t CO2. Regarding kinetics reaction, heat duty and ammonia losses, 3 wt% NH 3 is the suitable concentration to capture CO 2.
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Submitted on : Thursday, January 3, 2013 - 11:45:33 AM
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  • HAL Id : hal-00769760, version 1


Carol Toro Molina, Chakib Bouallou. Comparison of ammonia, monoethanolamine and methyldiethanolamine solvents to capture CO 2. 2010 AIChE Annual Meeting, 10AIChE, Nov 2010, Salt Lake City, United States. pp.Code 83459. ⟨hal-00769760⟩



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