D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/16 (2006.01)
Patent
CA 2284520
The invention relates to a method for bleaching and/or delignifying cellulose in which a) a sodium hydroxide solution and a peroxydisulfate solution are first of all produced by electrolysis of a sulphate, b) the peroxydisulphate solution is converted by hydrolysis into a Caro's acid/caroate solution, c) said Caro's acid/caroate solution is left to cool and d) used immediately as a bleaching solution for bleaching and/or delignifying cellulose, the Caro's acid/caroate solution becoming neutralized upon introduction into the bleaching solution.
L'invention concerne un procédé de blanchiment ou/et de délignification de cellulose dans lequel (a) on produit d'abord de l'hydroxyde de sodium et une solution de peroxydisulfate par électrolyse d'un sulfate, (b) on transforme par hydrolyse la solution de peroxydisulfate en un acide de Caro/une solution de caroate, (c) on laisse refroidir cet acide de Caro/cette solution de caroate, (d) et on utilise ce dernier ou cette dernière alors immédiatement comme solution de blanchiment pour le blanchiment ou/et la délignification de cellulose, l'acide de Caro/la solution de caroate étant neutralisé(e) lors de l'introduction dans le bain de blanchiment.
Dorn Maximilian
Gnann Michael
Gutewort Sven
Sebb Werner
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Peroxid-Chemie Gmbh & Co. Kg
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