Process for delignification and bleaching of chemical wood...

Details Process for delignification and bleaching of chemical wood... Process for delignification and bleaching of chemical wood...

D - Textiles, Paper

21

C

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

Patent

CA 2202150

A process of delignifying and bleaching a chemical wood pulp with hydrogen peroxide and dicyandiamide as an ativator provides a higher degree of delignification and brightness of the pulp and overcomes problems of fibre degradation. The process comprises adding hydrogen peroxide and dicyandiamide as a bleaching activator to a chemical wood pulp slurry under alkaline conditions.

L'invention se rapporte à un procédé de délignification et de blanchiment de cellulose chimique à l'aide de peroxyde d'hydrogène et de dicyandiamide tel qu'un activateur à haut pouvoir de délignification et de blanchiment de la cellulose et qui surmonte le problème de dégradation des fibres. Le procédé consiste à ajouter le peroxyde d'hydrogène et le dicyandiamide sous forme d'un activateur de blanchiment à une boue de cellulose chimique dans des conditions alcalines.

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