Oxygen delignification of old corrugated containers

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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162 8, 162 65, D21C 502

Patent

active

053504933

ABSTRACT:
Waste cellulosic paper products, for example, old corrugated container are recycled employing oxygen delignification in the presence of an alkaline material to produce a recycled pulp of lower kappa number, while maintaining adequate strength in the pulp. The recycling process preferably employs an acid pretreatment in combination with the oxygen delignification, and exposure of the waste product to the alkaline material is preferably controlled so that at any point in the delignification the waste product is exposed to not more than 50%, by dry weight, of the alkaline material based on the weight of residual lignin in the waste paper product.

REFERENCES:
patent: 3769152 (1973-10-01), Samuelson et al.
patent: 4259150 (1981-03-01), Prough
patent: 4946556 (1990-08-01), Prough
patent: 5211809 (1993-05-01), Naddeo et al.
Angulo "Environmentally Safe Bleaching of Post Consumer Waste Paper" TAPPI Pulping Conference Oct. 1990.
TAPPI Journal, 1986, "Upgrading of Pulp from Corrugated Containers by Oxygen delignification" deRuvo et al.
Markham et al "Oxygen Bleaching of Secondary Fiber Grades" TAPPI Journal 1988.

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