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Solvents for CO2 capture. Structure-activity relationships combined with vapour-liquid-equilibrium measurements

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Author: Mergler, Y.L. · Rumley-Van Gurp, R. · Brasser, P. · Koning, M.C. de · Goetheer, E.L.V.
Type:article
Date:2011
Source:10th International Conference on Greenhouse Gas Control Technologies, 19-23 September 2010, Amsterdam, Netherlands (Conference code: 84600), 4, 259-266
series:
Energy Procedia
Identifier: 429729
Keywords: Environment · ß-alanine · Amino acid · Amino alcohol · Co2 capture · Cysteamine · Ethylene amine · Ethylene diamine · Monoethanolamine (MEA) · Taurine · VLE · Amino alcohol · Co capture · Cysteamine · Ethylene diamine · Monoethanolamine · Taurine · VLE · Absorption · Alcohols · Amination · Amines · Desorption · Ethylene · Functional groups · Global warming · Greenhouse gases · Liquids · Organic polymers · Amino acids · Fluid Mechanics Chemistry & Energetics Life · GTR - Gas Treatment CBRN - CBRN Protection · TS - Technical Sciences EELS - Earth, Environmental and Life Sciences

Abstract

In this study a systematic approach was chosen to test and characterize amine systems for CO2 capture. Vapour-liquid-equilibrium measurements were performed on a homologue series of amines, with ethylene amine as base structure. Various functional groups were used that ranged in chemical and physical properties. The effect of the addition of the following functional groups was investigated: -NH2 (ethylene diamine), -COOH (ß-alanine), -SH (cysteamine), SO3H (taurine) and -OH (monoethanolamine). Of these amine systems, MEA and taurine showed comparable behaviour in CO2 absorption and desorption. ß-alanine formed relatively more (bi)carbonate. As expected, no direct correlation in absorption behaviour with pKa was found, whereas there was a linear correlation between desorption behaviour at a fixed partial pressure with pKa. © 2011 Published by Elsevier Ltd.