Method for bleaching lignocellulose-containing pulp

D - Textiles – Paper – 21 – C

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

Patent

CA 2121387

In a method for bleaching lignocellulose-containing pulp with a peroxide-containing compound, the pulp is, prior to the bleaching and in optional order, subjected to acid treatment at a pH of up to about 5 and treated with a complexing agent in order to release transition metal ions from their positions in the pulp. After the acid treatment, a magnesium compound and a calcium compound are added to the pulp at a pH of from about 3,5 to about 8 in order to reintroduce an optimum amount of magnesium and calcium ions into the pulp. The pulp is then bleached with a peroxide-containing compound at a pH of from about 7 to about 13.

Dans une méthode pour blanchir une pâte renfermant de la lignocellulose à l'aide d'un peroxyde, la pâte est, avant le blanchiment, soumise selon un ordre facultatif, à un traitement acide, le pH étant au maximum de 5, avec un agent complexant de façon à libérer les ions des métaux de transition de leurs positions dans la pâte. Après le traitement acide, on ajoute à la pâte à un pH d'environ 3,5 à 8, un composé du magnésium et un composé du calcium de façon à réintroduire une quantité optimale d'ions magnésium et calcium dans la pâte. Celle-ci est ensuite blanchie avec un composé à base de peroxyde à un pH d'environ 7 à 13.

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