Displacement washing of softwood pulp cooked to various levels of residual lignin content, TAPPI Journal September 2021

Of the basic brownstock washing operations, displacement washing is the most important and effective mechanism, and washing equipment is designed with emphasis on it. The information in this paper will enrich resources related to pulp washing that can impact end-product quality.

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Author: MD. Mostafizur Rahman and Frantisek Potucek
Displacement washing of softwood pulp cooked to various leve
ABSTRACT: This study investigates the influence of the degree of delignification of kraft spruce pulp cooked at seven different kappa numbers, ranging from 18.1 to 50.1, on the efficiency of displacement washing under laboratory conditions. Although the pulp bed is a polydispersive and heterogeneous system, the correlation dependence of the wash yield and bed efficiency on the Péclet number and the kappa number of the pulp showed that washing efficiency increased not only with an increasing Péclet number, but also with an increasing kappa number. The linear dependence between the mean residence time of the solute lignin in the bed and the space time, which reflects the residence time of the wash liquid in the pulp bed, was found for all levels of the kappa number. Washing also reduced the kappa number and the residual lignin content in the pulp fibers.

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