Kinetics of Carbon Dioxide Removal by Aqueous Alkaline Amino Acid Salts

Aqueous solutions containing alkaline salts of carboxylic or sulfonic amino acids represent candidate solvents with good potential for carbon dioxide (CO2) capture. In the present work, the CO2 reactions with potassium salts of glycine (aminoacetic acid) and taurine (2-aminoethanesulfonic acid) in a...

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Published inIndustrial & engineering chemistry research Vol. 49; no. 21; pp. 11067 - 11072
Main Authors Vaidya, Prakash D, Konduru, Prashanti, Vaidyanathan, Mukanth, Kenig, Eugeny Y
Format Journal Article Conference Proceeding
LanguageEnglish
Published Washington, DC American Chemical Society 03.11.2010
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Summary:Aqueous solutions containing alkaline salts of carboxylic or sulfonic amino acids represent candidate solvents with good potential for carbon dioxide (CO2) capture. In the present work, the CO2 reactions with potassium salts of glycine (aminoacetic acid) and taurine (2-aminoethanesulfonic acid) in aqueous solutions are investigated using a stirred-cell reactor. The reaction pathways are comprehensively described using the zwitterion and the termolecular mechanism. The investigated reactions belong to the fast pseudo-first-order reaction regime systems. The second-order rate constant for the CO2 reaction with potassium glycinate is determined, and its value at 303 K is evaluated to be 6.29 m3/(mol s). The liquid-side mass-transfer coefficient is estimated, and its value (0.006 cm/s) is consistent with those typical for stirred-cell reactors. Finally, it is determined that potassium glycinate promotes the activity of tertiary amines (e.g., N,N-diethylethanolamine).
ISSN:0888-5885
1520-5045
DOI:10.1021/ie100224f