Activator for pulp bleaching

D - Textiles – Paper – 21 – C

Patent

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D21C 9/16 (2006.01)

Patent

CA 2569467

A process for the bleaching of cellulosic fibres comprising the steps of (a) providing a water supply; (b) adding hydrogen peroxide to the stabilised water supply to form a hydrogen peroxide solution; (c) adjusting the pH of the hydrogen peroxide solution by adding alkali; mixing the pH adjusted solution resulting from step (c) to allow complete formation of perhydroxyl ion; (e) adding a carboxylic acid anhydride compound to the solution resulting from step (d); (f) mixing the solution resulting from step (e) to allow complete formation of percarboxylic acid to give a dilute solution of percarboxylic acid; and (g) contacting the solution with a suspension of cellulosic fibres.

La présente invention a trait à un procédé pour le blanchiment de fibres cellulosiques comprenant les étapes suivantes: (a) la mise à disposition d'une alimentation en eau; (b) l'ajout de peroxyde d'hydrogène à l'alimentation en eau stabilisée pour former une solution de peroxyde d'hydrogène; (c) l'ajustement du pH de la solution de peroxyde d'hydrogène par l'ajout d'alcali; (d) le mélange de la solution à pH ajusté obtenue de l'étape (c) pour permettre la formation complète d'ion perhydroxyle; (e) l'ajout d'un composé anhydride d'acide carboxylique à la solution obtenue à l'étape (d); (f) le mélange de la solution obtenue à l'étape (e) pour permettre la formation complète de l'acide percarboxylique pour l'obtention d'une solution d'acide percarboxylique; et (g) la mise en contact de la solution avec une suspension de fibres cellulosiques.

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