A process in a (d) stage bleaching of softwood pulps in a...

D - Textiles – Paper – 21 – C

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D21C 9/14 (2006.01)

Patent

CA 2671826

This invention relates to an improved bleaching process for bleaching pulp comprising at least one bleaching stage which comprises treating a softwood pulp with a bleaching agent comprising CIO2 in the presence of a weak base such as, for example, Mg(OH)2 preferably at pH from about 3.5 to about 6.5. The invention is also relates a bleaching process for bleaching pulp having two or more bleaching stages, at least one of which and preferably two of which comprises treating a pulp with a bleaching agent comprising CIO2 in the presence of a weak base such as, for example, Mg(OH)2 preferably at pH from about 3.5 to about 4.5.

L'invention concerne un procédé de blanchiment amélioré de pâte qui comprend au moins une étape de blanchiment consistant à traiter une pâte de résineux avec un agent de blanchiment comprenant CIO2 en présence d'une base faible telle que, par exemple, Mg(OH)2 de préférence à un pH compris entre environ 3,5 et 6,5. Cette invention concerne également un procédé de blanchiment de pâte comportant au moins deux étapes de blanchiment, au moins l'une d'elles et, de préférence, deux d'entre elles consistant à traiter une pâte avec un agent de blanchiment comprenant CIO2 en présence d'une base faible telle que, par exemple, Mg(OH)2 de préférence à un pH compris entre environ 3,5 et 4,5.

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