Multistage brightening of high yield and ultra high-yield wood p

Details Multistage brightening of high yield and ultra high-yield wood p Multistage brightening of high yield and ultra high-yield wood p

1988-03-15

1989-02-14

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 71, 162 72, 162 78, 162 80, 162 83, 162 84, D21C 910, D21C 916

Patent

active

048044407

ABSTRACT:
A multistage process for bleaching high-yield and ultra high-yield pulps is described whereby the pulp is treated sequentially with a peroxygen compound, a reducing compound and a final peroxygen compound to achieve higher brightness levels.

REFERENCES:
patent: 2290601 (1942-07-01), Reichert
patent: 2435566 (1948-02-01), Adams et al.
patent: 2862784 (1958-12-01), Kise
patent: 2865701 (1958-12-01), Shroeder
patent: 3100732 (1963-08-01), Smedberg
patent: 4294653 (1981-10-01), Lindahl et al.
patent: 4619733 (1986-10-01), Kooi

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