Method for bleaching paper pulp

Details Method for bleaching paper pulp Method for bleaching paper pulp

D - Textiles, Paper

21

C

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

Patent

CA 2422610

The invention concerns a method for bleaching different types of paper pulp in two steps at atmospheric pressure and at a temperature not higher than 100 ·C. The first step consists in contacting the unbleached paste with a mixture of paracetic acid and performic acid. The second step consists in treating the bleached pulp derived from the first step, with a solution of soda and hydrogen peroxide. The resulting pulps exhibit a high index of whiteness and a degree of polymerisation close to unbleached pulps. The method is environmentally safe and non-polluting.

Differents types de pâtes à papier sont blanchis en deux étapes à la pression atmosphérique et à une température inférieure ou égale à 100·C. La première étape procède par une mise en contact de la pâte écrue avec un mélange d'acide peracétique et d'acide performique. La deuxième étape procéde par un traitement de la pâte blanchie issue de la première étape, par une solution de soude et d'eau oxygénée. Les pâtes obtenues ont un haut indice de blancheur et un degré de polymerisation proche des pâtes écrues. Le procédé est écologique et non-polluant.

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