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Étude expérimentale et modélisation d'un procédé de captage en CO2 en postcombustion par l'ammoniaque à l'aide de contacteurs membranaires: du matériau à l'évaluation de l'intensification de l'absorption

Abstract : Aqueous ammonia as a solvent for post-combustion CO2 capture in a packed column is seen as a promising technology. Nevertheless, ammonia volatility is a considerable drawback for its large scale deployment. In this study, the ability of hollow fiber membrane contactors to significantly improve CO2 mass transfer performances while mitigating ammonia losses when compared to packed column is evaluated. In that purpose, the use of innovating composite fibers made of a thin dense layer selective for CO2 over NH3 is proposed. Up to now, a faster permeation of CO2 compared to NH3 in dense polymers was totally unexpected and to our knowledge unexplored. Time-lag experiments have revealed a series of 6 fluorinated structures showing the desired reverse selectivity properties. Teflon AF2400 has been selected as the dense skin of composite fibers used during absorption experiments. Their performances have been compared, for different operating conditions, to those given by commercial microporous (Oxyphan) and composite (Oxyplus) membrane contactors. Due to ammonium salt precipitation issues, no stable experiment has been achieved using microporous membrane contactors. At the opposite, absorption efficiencies higher than post-combustion capture standards have been reached using composite membrane contactors. 2D mass transfer modeling has revealed the controlling role of the microporous support in the observed absorption performances. Finally, high CO2 mass transfer intensification factor and drastically reduced ammonia losses have been shown
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https://hal.univ-lorraine.fr/tel-01750659
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Submitted on : Thursday, March 29, 2018 - 12:51:41 PM
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  • HAL Id : tel-01750659, version 1

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Camel Makhloufi. Étude expérimentale et modélisation d'un procédé de captage en CO2 en postcombustion par l'ammoniaque à l'aide de contacteurs membranaires: du matériau à l'évaluation de l'intensification de l'absorption. Autre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0318⟩. ⟨tel-01750659⟩

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