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Experimental Study of Pulp Washing Process

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M.I. Kravchenko

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The process of pulp washing by sulfite liquor displacement in batch cooking digester was studied. Filtrating constants and filtration rate depending on filtering layer depth and excess pressure for large-scale batch digesters were computed. It was shown that dry solids extrac-tion (soluble matter) from pulp fibers flow in two stages. The first stage – in out-diffusive area, while the second went on in internal diffusive area. It was showed that a depth of pulp layer at the end of displacement washing in cooking digesters of 320 m3capacity could reach up to 5,4 m in case of upward flow. The filtrating constants were calculated. It was found a relationship between filtration rate and hydraulic pressure at pulp washing in the cooking digesters equipped with hydraulic distributor for washing liquor. It was shown that at a certain hydraulic pressure in cooking digester a filtration rate of liquor might be constant till 120-th minute. High temperature pulp washing in batch cooking digesters enables producing easy-bleachable pulp.


M.I. Kravchenko, Candidate of Engineering, Associate Professor

Authors job

Saint Petersburg State Forest Technical University under name of S.M. Kirov, Institutskiy per., 5, St. Petersburg, 194021, Russia; e-mail:


mathematical model, pulping, washing, pulp bleaching, filtration, washing con-stants, cooking digester, pulp hardness, filtrating constants, filtration rate, engineering regu-lations, efficiency, hydraulic distributors of washing liquor.


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Received on December 26, 2014

Experimental Study of Pulp Washing Process