Étude d'un procédé propre couplant l'absorption gaz/liquide microstructurée avec la distillation pour le traitement d'air chargé par un Composé Organique Volatil

Abstract : This project focuses on the development of an industrial process, in which a coupled absorption/distillation unit is developed to treat gaseous effluents contaminated by a Volatile Organic Compound (VOC). Absorption is performed in a falling film microabsorber. The first stage of this work consists in characterizing the mass transfer in this device. The gas/liquid absorption of Perchloroethylene (PCE) by Di (2-EthylHexyl) Adipate (DEHA) is used as test case. Experiments showed the feasibility and the benefit of this separation process operated in a micro-contactor. Indeed, the purification efficiencies obtained are comparable to those of conventional processes (97%). Moreover, the required absorption solvent quantities are very low. A parametric study revealed significant mass transfer intensification on gas side and a gain in compactness due to the minimization of gas cavity thickness (2mm) and gas flowrate. This study also showed the limits of microabsorbers to handle large gas flowrates with good efficiencies, due to a low influence of gas velocity on the mass transfer coefficient. This behaviour was explained, thanks to 2D simulations, by a significant dispersion of concentration profiles, which indicates a diffusion limitation. The latter comes mainly from smooth laminar flow and the small size, a typical characteristic of micro-processes. To overcome this limitation, turbulence should be promoted in the gas. The second stage of this work concerns the microabsorber extrapolation from laboratory scale to industrial SMEs, based on the numbering-up concept. Calculations predict high throughputs with a microstructured absorber of competitive efficiency (95%) and high compactness (area occupied 0.5 m2). For profitable operation, solvent absorption recycling by a flash distillation is studied. The results lead to a promising treatment technique, which still requires a theoretical and experimental validation of the coupled absorber-distiller unit
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Neïla Mhiri. Étude d'un procédé propre couplant l'absorption gaz/liquide microstructurée avec la distillation pour le traitement d'air chargé par un Composé Organique Volatil. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL030N⟩. ⟨tel-01748717⟩

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