Process for the oxygen bleaching of cellulose pulp

Details Process for the oxygen bleaching of cellulose pulp Process for the oxygen bleaching of cellulose pulp

1981-06-04

1984-03-27

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 65, 162 81, D21C 302, D21C 900

Patent

active

044392710

ABSTRACT:
A two-stage oxygen bleaching of chemical cellulose pulp is provided, in which an alkaline oxygen bleaching stage is preceded by a nitrogen dioxide activating stage in which oxygen is added to the activating stage in an amount such that nitrogen monoxide formed as an intermediate during the activation process is consumed, so regulating the amount of oxygen added that when the activation reaction is practically complete, substantially all of the nitrogen dioxide and nitrogen monoxide has been consumed.

REFERENCES:
patent: 4076579 (1978-02-01), Brink
patent: 4087318 (1978-05-01), Samuelson et al.
Clarke, "The Action of Nitrogen Dioxide on Unbleached Pulp, Part I", TAPPI, Feb. 24, 1944, pp. 62-66.
Casey; "Pulp and Paper, 2nd Ed., vol. I"; Interscience Pub.; N.Y.; 1960, pp. 456-457.

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