Process for alkali cooking and delignifying cellulosic...

Details Process for alkali cooking and delignifying cellulosic... Process for alkali cooking and delignifying cellulosic...

D - Textiles, Paper

21

C

9/16.5

D21C 3/02 (2006.01) D21C 3/26 (2006.01)

Patent

CA 1087354

PROCESS FOR ALKALI COOKING AND DELIGNIFYING CELLULOSIC MATERIALS ABSTRACT A process for alkali cooking and delignifying cellulosic materials by using a vertical type pressurized reaction vessel providing therein with an alkali cooking zone, a washing zone, and a liquor-dis- placement delignifying zone in that order from one end to the other end of the reaction vessel. Chip-form cellulosic raw materials are cooked in the alkali cooking zone by an alkali cooking liquor and then washed in the washing zone. The thus cooked and washed cellulosic materials are transferred to the delignifying, zone where they are contacted with an alkaline aqueous medium containing previously dissolved oxygen to pro- ceed delignification with oxygen. A part of waste liquor formed during delignification is continuously discharged from the delignifying zone, while the fresh alkaline aqueous medium containing dissolved oxygen is continuously charged into the delignifying zone, whereby the continuous displacement of the waste liquor with the fresh alkaline aqueous medium containing dissolved oxygen is carried out in the liquor-displacement delignifying zone.

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