Treatment of chemical pulp with a chelating agent and an...

Details Treatment of chemical pulp with a chelating agent and an... Treatment of chemical pulp with a chelating agent and an...

D - Textiles, Paper

21

C

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

Patent

CA 2199257

A method of chlorine free bleaching of pulp where the metals in the pulp are removed by means of a chelating agent. The pulp is treated with the chelating agent at a pH 2-7 for a period of 5 minutes to 2 hours. The chelating agent is activated by the addition of an oxidizing agent. After the treatment the pulp is washed.

On décrit un procédé de blanchiment sans chlore de la pâte à papier, les métaux présents dans cette pâte étant éliminés par un agent chélatant. La pâte est traitée avec cet agent chélatant à un pH allant de 2 à 7, pendant une période de 5 minutes à 2 heures. L'agent chélatant est activé par l'adjonction d'un agent oxydant. Après ce traitement, la pâte est lavée.

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