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Selective hydrogenation in trickle-bed reactor. Experimental and modelling including partial wetting.

Dietz, Adrian and Julcour-Lebigue, Carine and Wilhelm, Anne-Marie and Delmas, Henri Selective hydrogenation in trickle-bed reactor. Experimental and modelling including partial wetting. (2003) Catalysis Today, vol. 79-80 . pp. 293-305. ISSN 0920-5861

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Official URL: http://dx.doi.org/10.1016/S0920-5861(03)00053-1

Abstract

A steady state model of a trickle bed reactor is developed for the consecutive hydrogenation of 1,5,9-cyclododecatriene on a Pd/Al2O3 catalyst. Various experiments have shown that the selectivity of this reaction towards the product of interest is much lower in co-current down-flow (trickle-bed) than in up-flow. This is due to uneven liquid distribution and to partial wetting of the catalyst surface at low liquid flow rates. The non-isothermal heterogeneous model proposed here takes into account the partial wetting of the catalyst, as well as the resistances to heat and mass transfer at the gas-liquid, liquid-solid and solid-gas interfaces. It assumes that the catalyst particles can be divided into two distinct concentration zones corresponding to the wetted and dry catalyst surfaces; mass transfer between these two zones is described by a simplified diffusion mechanism. Compared to previous models assuming a uniform concentration of liquid-phase components inside the catalyst particles, this model improves the prediction of the outlet concentrations of hydrogenation products.

Item Type:Article
Additional Information:Thanks to Elsevier. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S0920586103000531
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Réaction, mélange & séparation (RMS)
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Deposited By: Carine JULCOUR
Deposited On:28 Sep 2012 10:14

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