Kinetics of carbon dioxide reaction with diethylaminoethanol in aqueous solutions |
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| Affiliation: | 1. Hacettepe University, Department of Chemical Engineering, Beytepe, Ankara, Turkey;2. Amasya University, Physics Department, Amasya, Turkey;3. Atilim University, Chemical Engineering and Applied Chemistry Department, Ankara, Turkey;1. College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China;2. Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China;3. Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada |
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| Abstract: | Differential rates of CO2 adsorption into 0.90, 0.47 and 0.24 M aqueous solutions of 2-(diethylamino)ethanol (DEAE) were measured at 323 K over a wide range of carbonation ratios. A rigorous thermodynamic model was used to define species activities which were coupled with Danckwerts' gas-liquid reaction model to deduce the kinetics. The reaction of CO2 with this highly basic tertiary amine occurs by two pathways: (1) a minor path via the CO2 reaction with hydroxide ion and (2) a predominant reaction pathway that can be characterized by its first order dependency on the free amine concentration. The second reaction was proposed to involve an internal salt-like intermediate,. |
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