The kinetics of the CO2 reaction with the secondary amines diethanolamine and diisopropanolamine were determined in the organic solvent polyethylene glycol having an average molecular weight of 400. The zwitterion mechanism was used to interpret the reaction kinetics. The steady-state approximation applied to the reactive zwitterion intermediate for this mechanism was investigated and found to be valid for the range of parameters of this study. A wetted-sphere gas-liquid contacting device was used for gas absorption experiments, which were analyzed to give the reaction kinetics. Experiments were performed over the temperature range 20-40°C. The results were correlated by an Arrhenius expression for temperature dependence.
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