Process for bleaching of ligno-cellulosic material

D - Textiles – Paper – 21 – C

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D21C 9/14 (2006.01) D21C 9/10 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2074715

The present invention relates to a process for bleaching of ligno-cellulosic pulp digested by a chemical process for reduced formation of chloro-organic compounds, whip preserving the final brightness and strength properties of the pulp, by treating the pulp in a first stage with only chlorine dioxide at a charge factor of up to 2.0, whereupon the pulp is treated in an alkaline extraction stage reinforced with from 3.0 kg of hydrogen peroxide/ton of pulp. After the two-stage treatment the pulp can be finally bleached to the desired brightness in one or more chlorine dioxide stages.

L'invention concerne un procédé pour blanchir la pulpe de lignocellulose digérée chimiquement qui permet de réduire la formation de composés organo-chlorés tout en préservant la brillance finale et les propriétés de résistance de la pulpe, par une première étape de traitement de cette dernière au dioxyde de chlore seulement, à un facteur de charge allant jusqu'à 2.0, puis par une deuxième étape de traitement consistant en une extraction alcaline renforcée au peroxyde d'hydrogène à raison d'au moins 3,0 kg par tonne de pulpe. Après ce traitement en deux étapes, la pulpe peut être finalement blanchie à la brillance désirée en un ou plusieurs traitements au dioxyde de chlore.

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