Displacement of Black Liquor from Pulp Bed

Potůček, F. and Pulcer, M. Displacement of Black Liquor from Pulp Bed Chemical Papers, Vol.58, No. 6, 2004, 377-381

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  
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Author(s) Potůček, F.
Pulcer, M.
Title Displacement of Black Liquor from Pulp Bed
Journal name Chemical Papers
Publication date 2004
Year available 2004
Volume number 58
Issue number 6
ISSN 0366-6352
Start page 377
End page 381
Place of publication Poland
Publisher Versita
Collection year 2004
Language english
Subject 250000 Chemical Sciences
250500 Macromolecular Chemistry
Abstract/Summary Brownstock washing was simulated using a laboratory displacement washing cell. The displacement of black liquor from the kraft pulp bed was described by the dispersion flow model containing one dimensionless parameter, the Peclet number, for alkali lignin and sodium as the tracers. To characterize washing operation, the traditional wash yield, dispersion coefficient, mean residence time of both solutes, as well as the holding time of wash liquid were evaluated. With respect to various size of lignin fragmented in black liquor and sodium ions, the rate of leaching from within the fibres is different for both solutes. Therefore, the displacement washing efficiency should be expressed not only by the traditional wash yield, but also by the amount of both solutes washed out at the wash liquor ratio equal to unity, and the total amounts removed during washing operation must be taken into account as well.
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