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Displacement of Black Liquor From Pulp Bed
Authors: Potůček František | Pulcer Martin
Year: 2005
Type of publication: článek ve sborníku
Name of source: Proc. 15th International Papermaking Conference
Publisher name: neuveden
Place: neuvedeno
Page from-to: 10/1-10/6
Titles:
Language Name Abstract Keywords
cze Vytěsňování černého výluhu z buničinového lože Vytěsňování černého výluhu z buničinového lože vytěsňovací praní, sulfátová buničina, černý louh, lignin, sodík
eng Displacement of Black Liquor From Pulp Bed 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 the amounts of both solutes washed out at the wash liquor ratio equal to unity, as well as total amounts removed during washing operation must be taken into account. Various ability of both solutes to their displacement from the labyrinth of pores in the pulp bed by a miscible liquid results in the axial dispersion coefficient having greater values for lignin than for sodium. For pulp fibres, however, when the leaching of a solute from the fibres exists, the mean residence time is always higher than the space time. Owing to the fact that sodium is easily leachable solute in comparison with alkali lignin, then the mean residence time of sodium is somewhat longer than that of lignin. Displacement washing; Kraft pulp; Black liquor; Lignin; Sodium

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