Process for the continuous digestion of cellulosic fiber materia

Details Process for the continuous digestion of cellulosic fiber materia Process for the continuous digestion of cellulosic fiber materia

1989-10-12

1992-01-14

Fisher, Richard V.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 39, 162 41, 162 59, 162 62, 162239, 162242, 162249, 162251, D21C 326, D21C 712

Patent

active

050807552

ABSTRACT:
A process for the continuous digestion of cellulosic fiber material is described wherein the material is impregnated with liquid in a closed system comprising a concurrent flow zone and a countercurrent flow zone, the liquid in the concurrent flow zone including black liquor and possibly white liquor and the liquid in the countercurrent flow zone including white liquor. Liquid is withdrawn from the impregnation system at a point located between the concurrent flow zone and the countercurrent flow zone. Besides white liquor a predetermined amount of black liquor is added to the countercurrent flow zone in order to obtain a high liquid to wood ratio in the inlet of the digester.

REFERENCES:
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patent: 3035963 (1962-05-01), Schnyder
patent: 3097987 (1963-07-01), Sloman
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patent: 3532594 (1970-10-01), Richter
patent: 3652384 (1972-03-01), Sloman
patent: 3723242 (1973-03-01), Barker
patent: 3802956 (1974-04-01), Backlund
patent: 4071399 (1978-01-01), Prough
patent: 4608121 (1986-08-01), stman

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