Contacteurs à membranes denses pour les procédés d'absorption gaz-liquide intensifiés : application à la capture du CO² en post combustion

Abstract : The present work aims to explore the intensification of gas-liquid absorption processes. This study is applied to post combustion CO² capture by means of membrane contactors in comparison to packed columns. Microporous hollow fiber membrane contactors lead to high mass transfer but wetting problems are likely to occur and result in tremendous deterioration in performances with time. Our objective is to develop composite hollow fibers based on a microporous structure and a thin dense layer highly permeable to CO², in order to create a real barrier to liquid penetration and to limit mass transfer resistance. Super glassy polymers as PTMSP and Teflon AF2400 were selected for their extremely high CO² permeability and their chemical resistance to MEA (reference absorption liquid). Composite hollow fibers were made by coating and the dense layers obtained are thin (1 to 2 microns). Composite hollow fiber membrane contactors were tested for the separation of a CO²/N2 mixture with an aqueous solution of MEA. Capture ratios achieved by composite hollow fibers are similar to those measured for microporous membranes and the dense layer prevents from wetting problems. Simulations based on 2D modeling of the mass transfer, show that the performances of composite hollow fiber membrane contactors, under operating conditions close to the industrial case, can lead to an intensification factor up to 6 compared to packed columns
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Phuc Tien Nguyen. Contacteurs à membranes denses pour les procédés d'absorption gaz-liquide intensifiés : application à la capture du CO² en post combustion. Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL014N⟩. ⟨tel-01748894⟩

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