Method of reducing fluorescence in deinked pulp by treating pulp

Details Method of reducing fluorescence in deinked pulp by treating pulp Method of reducing fluorescence in deinked pulp by treating pulp

1994-04-15

1996-06-25

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 6, 162 65, 162 78, D21C 502, D21C 9153, D21C 916

Patent

active

055296602

ABSTRACT:
Provided herewith is a process for reducing the fluorescence of pulp fibers. The process comprises contacting the pulp fibers with ozone in two or more stages, with an intermediate washing stage or bleaching stage preferably being conducted in between the ozone contacting stages. It has been discovered that splitting the total ozone charge into two or more stages provides a much more efficient and effective process for reducing fluorescence.

REFERENCES:
patent: 5211809 (1993-05-01), Naddeo et al.
patent: 5302245 (1994-04-01), Nadeau
patent: 5346588 (1994-09-01), Sixta et al.
Kobayashi et al, "Effects of Multistage Ozone Bleaching Process of Pulp", Japan Tappi; Jun. 1976, pp. 42-47.
La Papeterie, No. 176, Feb. 1994, FR pp. 30-33, Dulion, C.; Kogan, J.; Muguet, M; Rabergeau, G., "L'ozone s'attaque aussi aux vieux papiers".
Database WPI, Section Ch, Week 7647, Derwent Publications Ltd., London, GB; Class F09, AN 76-87681X & JP-A-51 112 904 (Agency Of Ind Sci Tech) 6 Oct. 1976.

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