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Article Dans Une Revue Chemical Engineering Science Année : 2024

A new reactive absorption model using extents of reaction and activities. II. Application to CO 2 absorption into aqueous MDEA solutions

Résumé

Absorption into basic aqueous solutions is widely used for CO 2 separation from raw natural gas or from flue gases. This study implements a general steady-state model for reactive gas-liquid absorption. This work expands upon a first case study where the model was applied with the stagnant film theory (Whitman, 1923) to alkaline salts-water-CO 2 systems. This second case study uses the resulting Arrhenius expression to examine published CO 2 absorption and desorption flux data in MDEA-water-CO 2 system. Arrhenius parameters are optimised for the reaction CO 2 + MDEA + H 2 O ↔ HCO 3-+ MDEAH + with lnk (m 3 .mol-1 .s-1) = 16.69-6385/T (K). Results emphasise the role of CO 2 physical solubility representation in reactive absorption model overall performance. Global modelling is needed: kinetic parameters should be used together with all underlying parameters with which they were obtained. The relevance of activity-based modelling is shown, especially at high CO 2 absorption/desorption driving force.
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jeudi 18 juillet 2024
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Dates et versions

hal-04402486 , version 1 (18-01-2024)

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Serena Delgado, Alain Gaunand, Christophe Coquelet, Renaud Cadours, Céline Volpi. A new reactive absorption model using extents of reaction and activities. II. Application to CO 2 absorption into aqueous MDEA solutions. Chemical Engineering Science, 2024, 287, pp.119759. ⟨10.1016/j.ces.2024.119759⟩. ⟨hal-04402486⟩
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