Method for ozone bleaching paper pulp

Details Method for ozone bleaching paper pulp Method for ozone bleaching paper pulp

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) D21C 3/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2167605

A method for ozone bleaching unbleached chemical paper pulp in a single ozone stage and in the presence of a tertiary alcohol including four to eight carbon atoms which is fed into the reaction medium at a temperature of - 5 DEG C to 80 DEG C prior to the actual ozone treatment stage, whereby the gas-liquid transfer, the exchange potentiality, the lignin oxidation selectivity and the ozone efficiency are improved, and the consitency of the treated pulp undergoing ozone treatment is between 6 and 60 %.

Procédé de blanchiment de pâte à papier écrue du type chimique à l'aide d'ozone caractérisé en ce qu'il ne met en oeuvre qu'un stade ozone exclusivement, en présence d'un alcool tertiaire, comprenant de quatre à huit atomes de carbone qui est introduit dans le milieu réactionnel maintenu à une température comprise entre -5 °C et 80 °C, préalablement au stade de l'ozonisation proprement dit, afin d'améliorer le transfert gaz-liquide, la potentialité d'échange, la sélectivité de l'oxydation de la lignine et l'efficacité de l'ozone, la consistance de la pâte soumise à l'ozonisation étant comprise entre 6 et 60 %.

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