Method of peroxide bleaching cellulose-containing material

Details Method of peroxide bleaching cellulose-containing material Method of peroxide bleaching cellulose-containing material

D - Textiles, Paper

21

C

8/82

D21C 9/16 (2006.01)

Patent

CA 1234655

ABSTRACT A method of peroxide bleaching lignocellulose- containing material for providing a pulp of both high strength and brightness is described. Increase in strength is provided in a first stage by hyper-alkaline peroxide bleaching known per se, i.e. bleaching carried out at an initial pH of over 12, measured in the bleach- ing liquid at 24°C before mixing into the pulp. The desired brightness increase is provided in a subsequent stage with or without intermediate washing of the pulp and at a lower initial pH.

443564

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