Method for the impregnation and cooking of lignocellulosic mater

Details Method for the impregnation and cooking of lignocellulosic mater Method for the impregnation and cooking of lignocellulosic mater

1985-07-30

1988-08-16

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 60, 162 62, D21C 100, D21C 1100

Patent

active

047642513

ABSTRACT:
A method for the production of cellulose by the batch cooking process, wherein the digester is filled with chips and cooking liquor, and the batch is cooked at elevated temperature and pressure in order to obtain a delignified cellulose pulp in the digester. For the impregnation stage a cooking liquor is used which contains a substantially higher amount of active chemicals than is required for the cooking of the batch, and before the actual delignification stage the active-chemical batch for the cooking is adjusted and the excess amount of active chemicals is removed by replacing it by part of the hot spent cooking liquor recovered from a previous cooking.

REFERENCES:
patent: 2195378 (1940-03-01), Dunbar
patent: 2229886 (1941-01-01), Dunbar
patent: 3652384 (1972-03-01), Sluman
patent: 3679543 (1972-07-01), Rivers
patent: 4236961 (1980-12-01), Green

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