Pulp bleaching

Details Pulp bleaching Pulp bleaching

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 9/14 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2197771

Bleaching of chemical pulp in several steps comprising final bleaching with chlorine dioxide and, respectively, hydrogenperoxide. The pulp is treated directly in connection to the chlorine dioxide step (3) without intermediate washing with chelating agent (2) for the elimination of metal ions, preferably manganese. The pulp is thereafter washed (4) and bleached with hydrogenperoxide (5).

La présente invention concerne le blanchiment au dioxyde de chlore de la pâte chimique en plusieurs opérations avec blanchiment final par peroxyde d'hydrogène. Le procédé consiste à éliminer de la pâte les ions métalliques, de préférence le manganèse, au moyen d'un agent chélateur (2) directement lors du traitement au dioxyde de chlore (3), sans lavage intermédiaire. Le lavage de la pâte (4) intervient ensuite, à la suite de quoi elle est blanchie au peroxyde d'hydrogène (5).

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