Structure-property relationship for kinetics of the amines-CO2 reaction in aqueous solutions

Abstract : The post-combustion process by amine scrubbing is currently the most mature to reduce carbon dioxide emissions from industry. However, if there are numerous demonstrators, the investment and operating cost of this process are still too important to develop it in a large scale. The kinetics of reaction between the amine and the carbon dioxide is one of the major factor which influence the costs. The objectives of this work are to study and understand the kinetics of the amine-CO2 reaction and to set up of a predictive structure-property model. This approach is adapted to the large number of possible amines which can be candidates for the process. In a first time we study five kinds of amines (primary, acyclic secondary, cyclic secondary, tertiary and multi-amines) representatives of candidate molecules. Among those molecules, two behaviours can be distinguished: one the one hand amines which form carbamates and on the other hand those which do not form carbamates. Measurements have been realised at 25 °C in diluted solutions by stopped-flow technique to characterize the intrinsic kinetics of each of the 87 studied amines using two kinetic constants. For each kind of amine, the main structural factors, electronic and geometric, which impact the kinetics of reaction have been identified. Then, from a statistical model using molecular descriptors to describe the different parameters of each amine, a structure-property relationship has been set up with the different kinetic constants. A descriptor of the steric hindrance has been developed
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Gabriel Couchaux. Structure-property relationship for kinetics of the amines-CO2 reaction in aqueous solutions. Food and Nutrition. Université de Lorraine, 2013. English. ⟨NNT : 2013LORR0206⟩. ⟨tel-01750507⟩

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