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Theoretical analysis of tracer method for the measurement of wetting efficiency

Julcour-Lebigue, Carine and Baussaron, Loïc and Delmas, Henri and Wilhelm, Anne-Marie Theoretical analysis of tracer method for the measurement of wetting efficiency. (2007) Chemical Engineering Science, vol. 62 (n° 18-20). pp. 5374-5379. ISSN 0009-2509

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Official URL: http://dx.doi.org/10.1016/j.ces.2006.12.063

Abstract

This work investigates the tracer technique for the measurement of catalyst wetting efficiency, f, in trickle-bed reactor. The model of Ramachandran et al. (1986), based on a 2D description of the tracer diffusion, is applied for the full range of wetting efficiency. It is also extended to account for the effects of axial dispersion, liquidsolid mass transfer, pattern of the wetted zone on the pellet, and distribution of the partial wetting along the reactor. The numerical method for parameter optimisation implies a frequency domain least-squares procedure. A sensitivity analysis has been performed proving the wetting efficiency may be derived with convenient accuracy in usual trickle-bed conditions: high Peclet and Biot numbers. For f>0.3, it is shown that wetting efficiency can be accurately calculated from apparent particle diffusivities derived in liquid-full conditions (Deapp,LF) and in partial wetting regime (Deapp,TB), using the following relation: f=sqrt(Deapp,TB)/(Deapp,LF).

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Chemical Engineering Science website : http://www.sciencedirect.com/science/journal/00092509
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Réaction, mélange & séparation (RMS)
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Deposited By: Hélène Dubernard
Deposited On:23 Oct 2008 13:23

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