Delignification and bleaching of a lignocellulosic pulp slurry w

Details Delignification and bleaching of a lignocellulosic pulp slurry w Delignification and bleaching of a lignocellulosic pulp slurry w

1976-07-16

1978-03-21

Corbin, Arthur L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With agitation or forced circulation

8111, 162 65, 162 78, 162 89, D21C 910

Patent

active

040802493

ABSTRACT:
A process for the delignification and bleaching of a lignocellulosic pulp slurry, having a consistency between about 1% and 10%, by weight of oven-dried pulp, and a pH between about 1 and 7, while at a temperature between about 0.degree. C. and 70.degree. C., with a gaseous mixture selected from the group consisting of ozone/oxygen, ozone/air, and a mixture thereof. The ozone containing gaseous mixture, which has an ozone concentration of from about 0.1% to about 20%, by weight of oxygen or air, is bubbled into the pulp slurry, while agitating the pulp slurry at a rate of about 0.01 to 5.0 horsepower-days per ton of pulp.

REFERENCES:
patent: 3318657 (1967-05-01), Wade
patent: 3352642 (1967-11-01), Heidt et al.
patent: 3619350 (1971-11-01), Marchfelder
patent: 3663357 (1972-05-01), Liebergott
patent: 3806404 (1974-04-01), Liebergott et al.
patent: 3829357 (1974-08-01), Thompson et al.
Soteland et al., Norsk Skogindustri[2] 1968: 46.

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