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Contacteurs à membranes composites et contacteurs microporeux pour procédés gaz-liquide intensifiés de captage du CO2 en post-combustion : expérimentation et modélisation

Elodie Chabanon 1
1 CEP/Paris
CEP - Centre Énergétique et Procédés
Abstract : The decrease of the CO2 anthropogenic emissions is one of the main aims of the 21st century. Different processes are developed in order to capture CO2, but gas-liquid absorption in packed columns is considered as the reference postcombustion technology. Membrane contactors, which could potentially decrease by a factor 2 to 10 the size of the absorption units due to an increased interfacial area (1000 to 5000 m2.m-3 ), a so-called intensification effect, have been investigated in this study. Two kind of hollow fibers are studied: microporous and composite membranes (i.e. a dense polymeric skin coated on a porous support). In a first part, a series of experiments is reported to evaluate the influence of some geometric and operating parameters on the process capture performances and on the mass transfer characteristics. Results obtained on short time scale experiments are in agreement to the literature results. Even though a dense skin layer on a porous support generates an additional resistance to the mass transfer, a dedicated study carried out on long time scale (several hundreds hours) show for the first time that mass transfer performances of composite fibers can be similar to microporous unwetted membranes. Moreover, the wetting resistance of the composite fibers compared to microporous hollow fibers (PP and PTFE) is clearly demonstrated. In a second part, a comparative study of different mathematical models with increasing complexity is carried out. One parameter is used to fit the experimental results: the membrane mass transfer coefficient (km). km values obtained through curve fits are in the range of data reported in the literature (10-2 to 10-5 m.s-1). However, the assumption of a km effective value which would depend of the operating conditions is addressed and discussed. This approach is different from the studies reported in the literature which generally postulates a single value for a given membrane material. Under these conditions, the composite membrane interest, which shows a constant and probably predictable value of the membrane mass transfer coefficient due to their wetting resistance, seems to be promising to intensify the gas-liquid absorption process in CO2 postcombustion capture.
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Elodie Chabanon. Contacteurs à membranes composites et contacteurs microporeux pour procédés gaz-liquide intensifiés de captage du CO2 en post-combustion : expérimentation et modélisation. Génie des procédés. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0061⟩. ⟨pastel-00677145⟩

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