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Issue 6, 2007
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Removal of carbon dioxide by absorption into blended amines: kinetics of absorption into aqueous AMP/HMDA, AMP/MDEA, and AMP/piperazine solutions

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Abstract

The emissions of anthropogenic carbon dioxide (CO2) are believed make a significant impact on global climate change. Hence, amine chemical absorption technology has been suggested to separate and recover CO2. In this study, reaction rate constants between CO2 and blended amines were determined by measuring their absorption rate for CO2. The experiments were carried out to investigate the characteristics of CO2 absorption by using additional absorbents such as hexamethylenediamine (HMDA), N-methyldiethanolamine (MDEA) or piperazine blended into 2-amino-2-methyl-1-propanol (AMP) in an agitated vessel. The absorption rates of CO2 into aqueous blended amine solutions were measured. Additive concentrations of 1, 3, and 5 wt% were added for each 30 wt% AMP solution. The results showed that the addition of HMDA, MDEA or piperazine into AMP increased the absorption rate as compared to AMP alone. Of these additives, HMDA showed the most enhancement in the reaction rate of AMP. The reaction rate constants of HMDA, MDEA and piperazine blended into AMP at 303–343 K were given by kH = 3.84 × 1010exp(−5361/T), kM = 6.60 × 109exp(−4959/T), and kP = 9.09 × 109exp(−5058/T), respectively.

Graphical abstract: Removal of carbon dioxide by absorption into blended amines: kinetics of absorption into aqueous AMP/HMDA, AMP/MDEA, and AMP/piperazine solutions

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Publication details

The article was received on 27 Sep 2006, accepted on 18 Jan 2007 and first published on 08 Feb 2007


Article type: Paper
DOI: 10.1039/B614101C
Citation: Green Chem., 2007,9, 594-598
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    Removal of carbon dioxide by absorption into blended amines: kinetics of absorption into aqueous AMP/HMDA, AMP/MDEA, and AMP/piperazine solutions

    W. Choi, K. Cho, S. Lee, J. Shim, H. Hwang, S. Park and K. Oh, Green Chem., 2007, 9, 594
    DOI: 10.1039/B614101C

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