Kinetic study of carbon dioxide reaction with tertiary amines in aqueous solutions

Journal Article · Thu Nov 26 00:00:00 EST 1981 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150624a027· OSTI ID:5916195

Barth, D; Tondre, C; Lappai, G; Delpuech, J J

Reaction kinetics of CO/sub 2/ with triethanolamine (TEA) and methyldiethanolamine (MDEA) in aqueous solution have been studied by using a stopped-flow technique with pH detection. Rate constants are obtained from the comparison of experimental and theoretical curves giving the optical density as a function of time. At concentrations of CO/sub 2/ well below the saturation limit, the results are consistent with the hydration reactions of the CO/sub 2/ molecules either with neutral water molecules or with hydroxide ions, depending upon the pH, itself governed by the ionization equilibrium of the dissolved amine. Moreover, a specific (catalytic) reaction, first order with respect to both carbon dioxide and amine (rate constant, 2.85 M/sup -1/ s/sup -1/ at 25/sup 0/C), has been shown to contribute significantly to the reaction rate in the case of the first amine (TEA) only.

• Research Organization: Universite de Nancy I, France
• OSTI ID: 5916195
• Journal Information: J. Phys. Chem.; (United States), Vol. 85:24
• Country of Publication: United States
• Language: English

Related Subjects

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