Process for bleaching cellulose with organic peracid

Details Process for bleaching cellulose with organic peracid Process for bleaching cellulose with organic peracid

1981-02-06

1983-08-23

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 78, D21C 916

Patent

active

044002378

ABSTRACT:
Cellulose is bleached by means of an organic peracid in the acid region and subsequently by means of peroxide in the alkaline region. As peracid there is employed an acid which is produced from the corresponding carboxylic acid by reaction with hydrogen peroxide in the presence of a mineral acid. The peroxide bleaching step which follows the peracid bleaching step is carried out after there is added the necessary amount of aqueous alkali solution for carrying out the peroxide bleaching step of the pulp without intermediate washing of the cellulose. A further addition of peroxide is not carried out.

REFERENCES:
patent: 2394989 (1946-02-01), Dreyfus
patent: 2730444 (1956-01-01), Hodge et al.
patent: 3193445 (1965-07-01), Parker et al.
patent: 3867246 (1975-02-01), Hebbel et al.

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