Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1991-05-03
1993-03-30
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 52, 162 57, 162 68, 162 90, 162243, 162246, D21C 102, D21C 106, D21C 706, D21C 708
Patent
active
051980754
ABSTRACT:
A method of digesting lignocellulose materials impregnated with solutions of hydroxides or salts of alkali or alkaline earth metals, the ratio by weight of the solution retained during the impregnation and the dry matter being less than 2, in a digester, characterized by subjecting the impregnated materials before the digestion to a treatment with live steam under a pressure equal to or greater than that present in the digester so that a part of the steam, by giving off its sensible heat to the impregnated material and condensing, assures the preheating and penetration of the impregnation liquor up to the center of the material. The time of digestion is shorter and the pulp obtained more homogeneous.
REFERENCES:
patent: 3293118 (1966-12-01), Putnam et al.
patent: 3664919 (1972-05-01), Clayton et al.
patent: 4092212 (1978-05-01), Richter et al.
patent: 4790905 (1988-12-01), Nivelleau de La Bruniere
Abstract Bulletin of the Institute of Paper Chemistry, vol. 54, No. 4, Oct. 1983, p. 422, V. Galichev et al.
Abstract Bulletin of the Institute of Paper Chemistry, vol. 54, No. 3, Sep. 1983, p. 355, G. Kosaya et al.
Galichon Jean P.
Nivelleau de La Bruniere Patrick
Alvo Steve
Tag Pulp Industries S.A.
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