C - Chemistry – Metallurgy – 12 – N
Patent
C - Chemistry, Metallurgy
12
N
C12N 9/99 (2006.01) D21C 5/02 (2006.01) D21C 9/10 (2006.01) D21C 9/16 (2006.01)
Patent
CA 2155124
The invention comprises a composition and use of said composition to suppress or inhibit the decomposing action of enzymes on hydrogen peroxide, e.g. peroxidase and catalase, during bleaching of cellulose fibres with hydrogen peroxide, especially in connection with the production of recycled paper, in such a way that microorganisms are not markedly affected, and discharges that are dangerous to the environment are minimized. The composition contains hydroxylamine, thiocyanate salts, formic acid, ascorbic acid or nitrites. The invention also comprises a method for treatment and bleaching of cellulose.
L'invention concerne une composition et son utilisation pour supprimer ou inhiber l'action de décomposition d'enzymes sur le peroxyde d'hydrogène tels que la peroxydase et la catalase pendant le blanchiment de fibres de cellulose au peroxyde d'hydrogène, en particulier lors de la production de papier recyclé, de sorte que les micro-organismes ne soient pas sensiblement affectés, et que les décharges nuisibles pour l'environnement soient minimisées. Ladite composition contient de l'hydroxylamine, des sels de thiocyanate, de l'acide formique, de l'acide ascorbique ou des nitrites. L'invention porte également sur un procédé de traitement et de blanchiment de la cellulose.
Abrahamsson Kjell
Paart Enn
Wallberg Peter
Bim Kemi Ab
Goudreau Gage Dubuc
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