Multi-stage pulp washing within a batch digester

Details Multi-stage pulp washing within a batch digester Multi-stage pulp washing within a batch digester

1987-06-29

1991-05-14

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

162 51, D21C 900, D21C 904

Patent

active

050153331

ABSTRACT:
A method for washing pulp in a batch digester modified pulping process wherein black cooking liquor used for cooking the chips is partially displaced by pumping a first stage wash effluent into the bottom of the digester, additional amounts of the cooking liquor are displaced by pumping a second stage wash effluent, and so on, until sufficient increments of wash effluent have been pumped to displace the cooking liquor. A wash filtrate water is then pumped into the digester from a final pulp washing operation to displace the hot black liquor until all of the hot black liquor is sent to an accumulator, and the various wash effluents have been replenished in their respective stages.

REFERENCES:
patent: 1934957 (1933-11-01), Wells
patent: 2195378 (1940-03-01), Dunbar
patent: 2671727 (1954-03-01), Westcott et al.
patent: 4236961 (1980-12-01), Green
patent: 4690731 (1987-09-01), Hartler et al.
patent: 4705600 (1987-11-01), Jacobson

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