Method for delignifying and/or bleaching cellulose pulp

Details Method for delignifying and/or bleaching cellulose pulp Method for delignifying and/or bleaching cellulose pulp

D - Textiles, Paper

21

C

8/79

D21C 9/14 (2006.01) D21C 9/10 (2006.01) D21C 9/12 (2006.01)

Patent

CA 1147909

16-257 METHOD FOR DELIGNIFYING AND/OR BLEACHING CELLULOSE PULP ABSTRACT OF THE DISCLOSURE A method for delignifying and/or bleaching cellulose pulp adds to the cellulose pulp a liquid which contains chlorine dioxide, causes the pulp to react with the chlorine dioxide over a selected period of time, and then reduces the amount of available active chlorine, optionally to a negligible amount, either by reducing the amount of liquid accompanying the cellulose pulp and/or by displacing such liquid with a newly supplied liquid containing no active chlorine or at most only a small amount of active chlorine; the displaced liquor can be replenished with chlorine and optionally with chlorine dioxide, and then added mainly to fresh cellulose pulp in the same bleaching stage, and/or to cellulose pulp in another bleaching stage.

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