Bleaching process

D - Textiles – Paper – 21 – C

Patent

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

Patent

CA 2398312

A process for final bleaching cellulose-containing pulp which has been subjected to previous bleaching with a peroxide compound. The process involves the sequential steps of exposing the pulp to an amount of a reducing agent in order to eliminate residual peroxide compound from the pulp and then final bleaching the pulp by exposing the pulp to an amount of formamidine sulfinic acid.

L'invention se rapporte à un procédé de blanchiment final d'une pâte à papier cellulosique qui a été soumise à un blanchiment préalable au moyen d'un composé à base de peroxyde. Ledit procédé consiste à exposer la pâte à papier à un agent réducteur en quantité suffisante pour supprimer tout résidu du composé à base de peroxyde de la pâte à papier, puis à effectuer séquentiellement le blanchiment final de la pâte à papier en exposant celle-ci à une quantité donnée d'acide formamydine sulfinique.

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