Oxygen delignification of old corrugated containers

Details Oxygen delignification of old corrugated containers Oxygen delignification of old corrugated containers

1994-06-16

1996-01-23

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With formation of web or article

162 6, 162 8, D21C 502

Patent

active

054862680

ABSTRACT:
Waste cellulosic paper products, for example, old corrugated containers are recycled employing oxygen delingnification 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: 4436586 (1984-03-01), Elmore
patent: 4737283 (1988-04-01), de Ruro
patent: 4946556 (1990-08-01), Prough
patent: 5211809 (1993-05-01), Naddeo et al.
Aikawa "Recovery of Unbleached . . . and Feasibility as the Furnish of Bleached Kraft Pulp" 1989 Technical Announcement.
Markham et al. "Oxygen Bleaching of Secondary Fiber Grades" Tappi, Dec. 1988.
de Ruvo et al. "Upgrading of Pulp from Corrugated Containers by Oxygen Delignification" Tappi, Jun. 1986.

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