Process for preparing a paper pulp using carbon dioxide as an ac

Details Process for preparing a paper pulp using carbon dioxide as an ac Process for preparing a paper pulp using carbon dioxide as an ac

1988-01-21

1992-08-18

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

162 63, 162 78, 162 87, 162 88, D21C 914, D21C 916

Patent

active

051396130

ABSTRACT:
A process for souring chemical or mechanical cellulosic pulp using carbon dioxide to obtain proper acidification of the pulp slurry. The souring is performed after a single or a multistage bleaching sequence ending with sodium hypochlorite, calcium hypochlorite or hydrogen peroxide or the like in a common process for the preparation of paper pulp. The use of CO.sub.2 permits bleaching to continue because CO.sub.2 does not destroy the bleaching residuals remaining from the single or last bleaching stages.

REFERENCES:
patent: 3806404 (1974-04-01), Liebergott et al.
patent: 4042452 (1977-08-01), Arhippainen et al.
patent: 4568420 (1986-04-01), Nonni et al.
patent: 4617090 (1984-12-01), Chum et al.
Singh et al. "The Bleaching of Pulp"; Tappi Press Atlanta, Ga., 1979 p. 213-214; 387-379; 382-390.

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