New Amine Blends for Improved CO2 Separation: A Study on Reaction Kinetics and Vapor–Liquid Equilibrium |
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Authors: | Neha Budhwani Renu Sinha Parivesh Chugh |
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Affiliation: | 1. Department of Chemical Engineering, Institute of Chemical Technology, Mumbai, India;2. GAIL (India) Limited, Noida, Uttar Pradesh, India |
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Abstract: | Gas cleaning will be more eco-friendly if the absorbents used for CO2 capture are prepared from renewable supplies such as ethanol. Ethylene diamine (EDA), N-ethylmonoethanolamine (EMEA), N-ethyldiethanolamine (EDEA), and N,N′-diethylmonoethanolamine (DEMEA) represent this class of solvents. We selected two new blends from this group: EDEA?+?EMEA and DEMEA?+?EDA. Thus, a high-capacity tertiary amine (EDEA or DEMEA) was mixed with a very reactive amine (EMEA or EDA). Using a stirred cell, we analyzed kinetics of the CO2 reaction with these blends in aqueous solutions (2–3?M) at 308?K. On the whole, two reactions ensued in parallel: one, between CO2 and EDEA (or DEMEA), and the other, between CO2 and EMEA (or EDA). We evidenced that DEMEA and DEMEA?+?EDA were more reactive than EDEA and EDEA?+?EMEA. We reported the rate constant for EMEA and EDA (4700 and 28,300?M?1?s?1). Finally, we presented vapor–liquid equilibrium data for the DEMEA?+?EDA blend. |
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Keywords: | Absorption kinetics CO2 capture Mass transfer Vapor–liquid equilibrium |
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