Method of bleaching pulp without using chlorine chemicals

Details Method of bleaching pulp without using chlorine chemicals Method of bleaching pulp without using chlorine chemicals

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) D21C 9/10 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2163116

The present invention relates to a method of treating chemical paper pulp, in which the pulp is first pH-adjusted to a pH of between 1 and 6 and then treated with ozone and a chelating agent with the aim of reducing the kappa number, after which the pulp is washed and immediately thereafter bleached with peroxide, with the chelating agent being added after the ozonisation without any intervening wash.

La présente invention se rapporte à un procédé de traitement de la pâte à papier chimique, dans lequel la pâte est d'abord ajustée à un pH compris entre 1 et 6, puis est traitée à l'ozone et à l'aide d'un agent de chélation dans le but de réduire l'indice kappa, après quoi, la pâte est lavée et immédiatement après blanchie avec du peroxyde, l'agent de chélation étant ajouté après l'ozonisation sans aucun lavage intermédiaire.

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