Process for producing alkali pulp

Details Process for producing alkali pulp Process for producing alkali pulp

D - Textiles, Paper

21

C

9/16

D21C 3/02 (2006.01) D21C 3/26 (2006.01) D21C 7/08 (2006.01)

Patent

CA 1127357

PROCESS FOR PRODUCING ALKALI PULP ABSTRACT OF THE DISCLOSURE A process for producing alkali pulp by using a single, cylindrical pressurized reaction vessel having therein a liquor-impregnating zone, a cooking zone, a washing zone, and a diluting zone in that order, and having a motor-driven scraping or agitating device and a pulp discharging outlet in the end portion of the diluting zone. Alkaline aqueous medium containing dissolved oxygen therein is introduced into the diluting zone. A part of the introduced alkaline aqueous medium countercurrently contacts with cooked cellulosic mater- ials transferred from the washing zone to the diluting zone to proceed with oxygen-alkali delignification, and is finally discharged out of the vessel from the end portion of the cook- ing zone. The remainder of the introduced alkaline aqueous medium contacts with the cooked cellulosic materials in the diluting zone in a scraping or agitating manner by means of the motor-driven scraping or agitating device to proceed with oxygen-alkali delignification, and is finally served as dilut- ing liquor to be discharged out of the vessel accompanying the resulting pulp out from the discharging outlet.

328033

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