Abstract
MEA is commercially the most widely used solvent for the removal of CO2 from flue gases. Its rate of absorption of CO2 from flue gases is very high. However, it has a limitation that its maximum loading capacity of CO2 based on stoichiometry is, about 50%, in contrast to tertiary amines such as methyl diethanol amine (MDEA) which has a CO2 loading capacity that approaches 100%. Also, the heat of desorption of CO2 from MEA (during regeneration) is very high as compared with MDEA. Additionally, MEA degrades when CO2-loaded MEA comes in contact with oxygen (O2) and impurities such as SO2 - a process catalyzed by multivariate cations. The amine concentration can be altered to achieve precisely the desired separation for a given process. There appears to be sufficient information in the literature concerning the CO2 loading and the rate of CO2 absorption into mixed amines.
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