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Nonuniform channels in adsorbent monoliths

  1. B. D. Crittenden1,
  2. O. Camus1,*,
  3. S. P. Perera1,
  4. T. J. Mays1,
  5. F. Sánchez-Liarte1,
  6. S. R. Tennison2,
  7. E. Crezee2

Article first published online: 21 JUN 2010

DOI: 10.1002/aic.12335

Issue

AIChE Journal

AIChE Journal

Volume 57, Issue 5, pages 1163–1172, May 2011

Additional Information

How to Cite

Crittenden, B. D., Camus, O., Perera, S. P., Mays, T. J., Sánchez-Liarte, F., Tennison, S. R. and Crezee, E. (2011), Nonuniform channels in adsorbent monoliths. AIChE J., 57: 1163–1172. doi: 10.1002/aic.12335

Author Information

  1. 1

    Dept. of Chemical Engineering, University of Bath, Bath BA2 7AY, U.K.

  2. 2

    MAST Carbon Technology Ltd., Henley Park, Guildford, Surrey GU3 2AF, U.K.

*Dept. of Chemical Engineering, University of Bath, Bath BA2 7AY, U.K.

Publication History

  1. Issue published online: 12 APR 2011
  2. Article first published online: 21 JUN 2010
  3. Manuscript Revised: 1 JUN 2010
  4. Manuscript Received: 5 FEB 2010

Funded by

  • Engineering and Physical Sciences Research Council (EPSRC)
  • Joint Grant Scheme with the Defence Science and Technology Laboratory, Porton Down, UK, under grant reference. Grant Number: GR/S55804/01

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Keywords:

  • activated carbon monoliths;
  • channel modeling;
  • nonuniformities;
  • VOC control

Abstract

A model is introduced to account for nonuniform channel geometries in monolithic adsorbents. Based on nonisothermal operation, fully developed parabolic flow and the full three-dimensional convection-diffusion equation, the model is applied to the adsorption of dichloromethane from an air stream flowing through a binder-less activated carbon monolith. The equilibrium parameters and the effective diffusion coefficient for adsorption are obtained independently from gravimetric adsorption experiments. The nonuniform channel model is capable of predicting breakthrough curves as a function of feed gas flow rates up to dimensionless breakthrough concentrations of about 0.4–0.6, depending on the feed flow rate. Even though the variation of effective diffusion coefficient with both concentration and temperature has been tested, successful prediction over the whole range of concentration may require the incorporation of further aspects relating to the anisotropic nature of the carbon. © 2010 American Institute of Chemical Engineers AIChE J, 2011

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