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Salim Kadiwala, Aravind V. Rayer, Amr Henni
Chemical Engineering Journal, November 2011
Abstract
Pseudo first order rate constants of homogeneous reactions of carbon dioxide (CO2) with primary amines,ethylenediamine (EDA) and 3-amino-1-propanol(3AP),in methanol and ethanol in the concentration range (20 to120) mol·m3; and with tertiary amines, 3-dimethyl-amino-1-propanol (3DMA1P) and 1-dimethylamino-2-propanol (1DMA2P), in waterin the concentration range (20 to120) mol·m3 weremeasured using a stopped-flow apparatus in a temperature range of (293 to 313) K.Dissociation constants for aqueous 3DMA1P and 1DMA2P systemsat different temperatures were also measured. Both tertiary amines were found to react faster with CO2 than N-methyldiethanolamine(MDEA). The orders of the reaction were determined and the constants wereregressed usingthemechanismthat fitted best the experimental data for each system.Second order reaction rate constants of ethylenediamine (EDA) in methanol and ethanol were higher than those of 2-((2-Aminoethyl) amino) ethanol (AEEA), a fast reacting amine,whereas the rates of reaction of 3AP were found to be less than those of monoethanolamine (MEA) in methanol and ethanol.As expected, for both EDA and 3AP, the second order reaction rate constants were found to be lower in non-aqueous media than in water.
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