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Wetting topology in trickle bed reactors

Baussaron, Loïc and Julcour-Lebigue, Carine and Wilhelm, Anne-Marie and Boyer, Christophe and Delmas, Henri Wetting topology in trickle bed reactors. (2007) AIChE Journal, 53 (7). 1850-1860. ISSN 0001-1541

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Official URL: http://dx.doi.org/10.1002/aic.11189


Local and average partial wetting efficiencies in trickle-beds have been directly measured by image processing and PIV analysis. Two different setups have been implemented: a vertical monolayer of pellets where the wetting structure and stability and also local velocity gradient are characterized by PIV, and a fixed bed to analyze (by photography) the axial evolution of wetting over bed cross section after a transient injection of dye. Porous alumina spheres and different liquids have been used to examine the effect of liquid–solid affinity; two liquid distributors, and bed prewetting were investigated at low liquid superficial velocities (0.5 × 10−3–10−2 m/s). Contrary to usual techniques (excepting MRI), not only average wetting efficiencies are derived from the colorimetric tracing, but also local features: axial evolution of wetting, size, and locations of dry zones, distributions of wetting efficiency at a particle scale. All those local data are important to improve reactor models assuming uniform pellet wetting. The effect of liquid–solid affinity is predominant in the case of the monolayer of beads, and, contrary to usual assumption, is still significant for the real trickle bed in the low range of wetting efficiency, corresponding to liquid superficial velocity lower than 2 × 10−3 m/s.

Item Type:Article
HAL Id:hal-03477813
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > IFP Energies Nouvelles - IFPEN (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Réaction, mélange & séparation (RMS)
Deposited On:01 Oct 2012 09:43

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