Process for the pulping of lignocellulose materials with alkali

Details Process for the pulping of lignocellulose materials with alkali Process for the pulping of lignocellulose materials with alkali

1986-10-10

1988-12-13

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With squeezing, compression, rubbing, kneading

162 72, 162 77, 162 90, D21C 302, D21C 320

Patent

active

047909056

ABSTRACT:
A process for preparing a cellulose paste by treatment of lignocellulose materials which comprises impregnating wood or vegetable shavings in divided form with an aqueous solution containing 2 to 20% by weight of alkaline metal hydroxides, alkali metal salts, or alkaline earth metal hydroxides, adjusting the weight of the solution retained by impregnation to a value representing 1 to 3 times the weight of treated material, the ratio of the weight of the impregnated mass to the dry weight of the lignocellulosic material being preferably not more than about 2.6:1, subjecting the impregnated masses to cooking treatment by exclusively indirect heating at a temperature varying from 150.degree. to 200.degree. C. without exerting any mechanical disintegrating action for a period varying from 15 to 60 minutes, and pressing the cooked product so as to extract therefrom the solubilized lignin in the form of a black liquor containing about 50% of dry material. When operating at atmospheric pressure, the aqueous solution may further contain from 2 to 20% by weight of solvent chosen from the group comprising glycols, alkanolamines, sulfoxides and fatty acid salts.

REFERENCES:
patent: 2218479 (1940-10-01), Peterson et al.
patent: 3255071 (1966-06-01), Kleinert
patent: 3664918 (1972-05-01), Clayton
patent: 4091749 (1978-05-01), Procter et al.
patent: 4248663 (1981-02-01), Kubes
patent: 4552616 (1985-11-01), Kauppi
Rydhulm, "Pulping Processes", Interscience Publishers, N. Y., 1969, p. 336.

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