Improved process for manufacturing pulp, paper and...

D - Textiles – Paper – 21 – C

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D21C 9/10 (2006.01) D21B 1/04 (2006.01) D21H 21/30 (2006.01) D21H 21/32 (2006.01)

Patent

CA 2654187

A process for bleaching mechanical wood pulp is provided comprising subjecting the wood pulp to at least one bleaching stage with one or more bleaching agents in the presence of one or more optical brightening agent, wherein the bleaching agents are selected from the group consisting of oxidative bleaching agents other than chlorine based bleaching agents such as chlorine dioxide, elemental chlorine or a combination thereof, reductive bleaching agents or any combination of two or more thereof.

La présente invention a pour objet un procédé de blanchiment de pulpe de bois mécanique, ledit procédé comprenant le fait de soumettre la pulpe de bois à au moins une étape de blanchiment à l'aide d'un ou de plusieurs agents de blanchiment en présence d'un ou de plusieurs agents azurants optiques, les agents de blanchiment étant sélectionnés au sein du groupe constitué par les agents de blanchiment oxydants différents des agents de blanchiment chlorés, tels que le dioxyde de chlore, le chlore élémentaire ou une combinaison de ces composés, les agents de blanchiment réducteurs ou toute combinaison de deux ou de plus de deux de ces agents de blanchiment.

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