Étude cinétique des phénomènes d'activation pour l'absorption de CO2 par des mélanges d'amines

Abstract : Processes based on chemical absorption are widely used for removing CO2 contained in natural gas, hydrogen or flue gas. Mixtures of amines can be used as a solvent for these applications in order to accelerate CO2 mass transfer towards the liquid phase, while keeping a low energy consumption to be regenerated. A methodology has been developed in the framework of this PhD to understand the kinetics of the absorption of CO2 into mixtures of amines. Experimental data provided by a wetted wall column apparatus have been interpreted by a rigorous model taking into account all phenomena occurring within the reactor. This work was firstly dedicated to study the kinetics of the absorption of CO2 by aqueous piperazine solutions. The extrapolation of PZ / CO2 kinetics given by the literature has been validated in a wide range of operating conditions. The kinetics of the absorption of CO2 by mixtures of N-methyldiethanolamine and piperazine has then been assessed. The synergy between both amines at low loading allowing the CO2 mass transfer to be accelerated as well as the impact of the CO2 loading on the absorption kinetics have been quantified. This methodology will be used at IFP Energies nouvelles in order to study the kinetics of the absorption of CO2 by mixtures of amines, in the framework of CO2 postcombustion capture and natural gas treatment processes development. The knowledge of the kinetics of the CO2 absorption by mixtures of amines will allow to enhance the reliability of the absorption column design
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Theses
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http://docnum.univ-lorraine.fr/prive/DDOC_T_2013_0071_SERVIA.pdf
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https://hal.univ-lorraine.fr/tel-01749840
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Submitted on : Thursday, March 29, 2018 - 12:29:35 PM
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Alberto Servia. Étude cinétique des phénomènes d'activation pour l'absorption de CO2 par des mélanges d'amines. Autre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0071⟩. ⟨tel-01749840⟩

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