Process for preparing cellulose pulp from lignocellulosic...

Details Process for preparing cellulose pulp from lignocellulosic... Process for preparing cellulose pulp from lignocellulosic...

D - Textiles, Paper

21

C

9/35

D21C 3/02 (2006.01) B01D 61/14 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1264403

ABSTRACT OF THE DISCLOSURE A process is provided for preparing cellulose pulp by delignification of lignocellulosic material, which comprises subjecting particulate lignocellulosic material in a pulping zone to the pulping action of a pulping liquor at a temperature at which pulping reactions leading to formation of cellulose pulp proceed, and substances having a molecular weight above about 3500, preferably above about 2000, and preferably above about 1500, are physically sep- arated and removed from the lignocellulosic material and become dispersed in the pulping liquor; in the course of the pulping, withdrawing pulping liquor containing such dispersed substances, and removing such dispersed substances therefrom; and then returning the pulping liquor to the pulping zone.

498524

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