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http://dx.doi.org/10.9713/kcer.2012.50.1.135

Analysis of the Heat of Absorption Based on the Chemical Structures of Carbon Dioxide Absorbents  

Kwak, No Sang (Green Growth Laboratory, KEPCO Research Institute)
Lee, Ji Hyun (Green Growth Laboratory, KEPCO Research Institute)
Eom, Yong Seok (Green Growth Laboratory, KEPCO Research Institute)
Kim, Jun Han (Green Growth Laboratory, KEPCO Research Institute)
Lee, In Young (Green Growth Laboratory, KEPCO Research Institute)
Jang, Kyung Ryoung (Green Growth Laboratory, KEPCO Research Institute)
Shim, Jae-Goo (Green Growth Laboratory, KEPCO Research Institute)
Publication Information
Korean Chemical Engineering Research / v.50, no.1, 2012 , pp. 135-140 More about this Journal
Abstract
In this study, the heats of absorption of $CO_2$ with aqueous solutions of primary, secondary and tertiary amine aqueous solutions were measured in the commercial reaction calorimeter SIMULAR (HEL, UK). The heats of absorption of 30 wt% amine aqueous solutions of MEA (monoethanolamine, primary amine), EAE(2-(ethylamino)ethanol, secondary amine), and MDEA (methyldiethanolamine, tertiary amine) were measured as function of the $CO_2$ loading ratio at $40^{\circ}C$, in each case. In addition, the heats of absorption of sterically-hindered amine aqueous solutions of AMP(2-amino-2-methyl-1-propanol, primary amine), DEA(diethanolamine, secondary amine) and TEA(triethanolamine, tertiary amine) were measured to observe the steric hindrance effect. The heat of absorption is high in the following order regardless of the steric hindrance: primary amine > secondary amine > tertiary amine. The heats of absorption of amines having sterically-hindered substituents surrounding nitrogen atoms are relatively low compare to that of sterically-free amines, although the difference is very small.
Keywords
$CO_2$ Capture; Chemical Absorption; Enthalpy; Amine; Steric hindrance;
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