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Title
Modelling of displacement washing of pulp: comparison between model and experimental data
Authors
Shelly Arora and Frantisek Potucek
Received
May 21, 2009
Published
Volume 43 Issue 7-8 July-August
Keywords
mathematical modelling, displacement washing, softwood pulp
Abstract
A mathematical model assuming an axial dispersion mechanism, based on two dimensionless criteria, namely the Peclet number and the Biot number, was proposed for the displacement washing of a packed bed of porous, compressible and cylindrical particles. Bulk fluid concentration, intrapore solute concentration and concentration of the solute adsorbed onto the fiber surface were considered as a function of both washing time and position in the bed. Displacement washing experiments performed on pulp beds formed of unbeaten, unbleached kraft fibers were simulated with a laboratory washing cell. The model predicted values of the breakthrough curves, and the average alkali lignin concentration in the bed and displacement ratio were compared with those obtained experimentally. A close agreement was found between the experimental data and the ones calculated from model equations.
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