Method of bleaching high yield pulp by using dithionite ion and

Details Method of bleaching high yield pulp by using dithionite ion and Method of bleaching high yield pulp by using dithionite ion and

1987-12-23

1989-09-05

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Vacuum treatment

162 71, 162 83, 162205, 162207, 162339, D21C 910

Patent

active

048635642

ABSTRACT:
A method is described for increasing the brightness of reductively bleached high yield pulps, comprising bleaching the pulps with a reductive bleaching solution under anaerobic conditions and maintaining the bleached pulps under anaerobic conditions during all handling steps subsequent to bleaching, including paper formation, wet pressing, and drying of the paper formed therefrom. The bleached paper has higher brightness than the same paper produced under aerobic conditions, and the bleaching and handling-derived portion of this higher brightness is retained after storage of the finished paper.

REFERENCES:
patent: 3467574 (1969-09-01), West
patent: 4063997 (1977-12-01), Kirjavainen et al.
Westvaco, "Panorama of Papermaking Today", 1971.
Singh, "The Bleaching of Pulp", TAPPI Press, Atlanta; 1979, pp. 255-259.
Fleury et al., "Characterization of Chromophoric Groups in Groundwood and Lignin Model Compounds by Reaction with Specie Reducing Agents"; Pulp & Paper Canada, Mar. 15, 1968, pp. 62-68.

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