Collect. Czech. Chem. Commun. 1997, 62, 626-644

Washing of Pulp Fibre Bed

František Potůček

Department of Wood, Pulp and Paper, University of Pardubice, 532 10 Pardubice, Czech Republic


The mechanism of the displacement washing of unbleached kraft pulp was investigated. The flow of the wash liquid through a pulp bed was described by the dispersion model using one dimensionless parameter known as the Peclet number. To characterize the displacement washing, the wash yield, dispersion coefficient, and bed efficiency, as well as time parameters such as the mean residence time of lignin, and space time were evaluated. Results obtained for kraft pulp were compared with those for static bed of glass spheres.

Keywords: Displacement washing; Pulp; Dispersion model.