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Kinetics of Carbon Dioxide with tertiary Amines in aqueous solution
Author(s) -
Littel R. J.,
Van Swaaij W. P. M.,
Versteeg G. F.
Publication year - 1990
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690361103
Subject(s) - amine gas treating , chemistry , aqueous solution , mass transfer , kinetics , tertiary amine , catalysis , chemical kinetics , carbon dioxide , reaction rate constant , kinetic energy , thermodynamics , reaction rate , reaction mechanism , chemical reaction , organic chemistry , chromatography , physics , quantum mechanics
The reaction of CO 2 with TEA, DMMEA, and DEMEA has been studied at 293, 303, 318 and 333 K. All the kinetic experiments were carried out in a stirred cell reactor operated with a flat, smooth and horizontal gas‐liquid interface. A numerical method, which describes mass transfer accompanied by reversible chemical reactions, has been applied to infer rate constants from the experimental data. It is argued that the contribution of the CO 2 reaction with OH − to the observed reaction rate may have been overstimated in most literature on tertiary amine kinetics as serious depletion of OH − toward the gas‐liquid interface usually occurs. For all the amines studied, the reaction order in amine was found to be about one for each temperature investigated. This is in good agreement with the base catalysis mechanism proposed by Donaldson and Nguyen (1980). All kinetic data could be summarized reasonably well in one Brønsted relationship.