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http://dx.doi.org/10.9713/kcer.2022.60.4.582

Kinetics of CO2 Absorption in Aqueous DETA and DEEA Solutions by Wetted-Wall Column  

You, Jong Kyun (Greenhouse Gas Research Department, Korea Institute of Energy Research)
Lee, Jun (School of Chemical and Materials Engineering, Korea National University of Transportation)
Hong, Yeon Ki (School of Chemical and Materials Engineering, Korea National University of Transportation)
Publication Information
Korean Chemical Engineering Research / v.60, no.4, 2022 , pp. 582-587 More about this Journal
Abstract
Biphasic solvents are attracting attention as energy-reducing solvents for capturing CO2 from flue gas in combustion process. In this study, considering diethylenetriamine (DETA) and diethylethanolamine (DEEA) mixed solvents, one of the biphasic solvents by blending of two types of amines, the CO2 absorption rates of DETA and DEEA was measured by wetted wall column. The effects of DETA and DEEA concentrations and operating temperature on the overall mass transfer coefficient were investigated. As a result, the overall mass transfer coefficient was proportional to the DETA concentration. However, in the case of the DEEA concentration, the effect was small and when the concentration was exceeded, the overall mass transfer coefficient decreased. The DETA aqueous solution showed little change in the overall mass transfer coefficient with the operating temperature, whereas the DEEA aqueous solution increased the overall mass transfer coefficient with the operating temperature. As a result of obtaining the observed reaction rate constant under the pseudo-first-order reaction assumption, it was found that the observed reaction rate constant in DETA aqueous solution was proportional to the DETA concentration, but DEEA did not fit the pseudo-first-order reaction assumption.
Keywords
Diethylenetriamine; Diethylaminoethanol; Biphasic solvent; Wetted wall; Overall mass transfer coefficient;
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