Process for preparing cellulose pulp from lignocellulosic materi

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

1985-12-23

1987-06-02

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 36, 162 42, 162 82, 162 83, D21C 302, D21C 306, D21C 1100, D21C 1102

Patent

active

046700986

ABSTRACT:
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 separated 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.

REFERENCES:
patent: 2683090 (1954-07-01), Alfred et al.
Wayman et al., "Separation of Sugars and Lignin in Spent Pulping Liquor by Hydrolysis and Ultrafiltration" TAPPI, vol. 59, No. 3 (3-1976).
Collins et al., "Spent Sulfite Liquor Reducing Sugar Purification by Ultrafiltration with Dynamic Membranes" TAPPI, vol. 56, No. 6 (6-1973).

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