Composition and process for bleaching mechanical wood pulp

Details Composition and process for bleaching mechanical wood pulp Composition and process for bleaching mechanical wood pulp

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D21H 21/30 (2006.01)

Patent

CA 2576882

A method and compositions using tetra acetyl ethylene diamine (TAED) added to a bleaching solution of hydrogen peroxide to increase peroxide efficiencies and using a fluorescent whitening agent (FWA) added to a bleaching solution of hydrogen peroxide to increase the pulp brightness of a mechanical wood pulp and to reduce brightness reversion of high brightness mechanical pulps. The softwood pulp brightness after the bleaching tower has exceeded 86 ISO% points.

Divulgation d'une méthode et de compositions à base de tétra-acétyléthylènediamine (TAED) ajoutée à une solution de blanchiment de peroxyde d'hydrogène pour améliorer l'efficacité du peroxyde, et utilisant un azurant fluorescent ajouté à la solution de blanchiment de peroxyde d'hydrogène pour accroître la brillance de la pâte d'une pâte de bois mécanique et pour réduire la perte de blancheur de pâtes mécaniques de brillance élevée. La brillance de la pâte de résineux après la tour de blanchiment est supérieure à 86 % en points ISO.

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