Treatment of pulp with chelating agent and subsequent...

Details Treatment of pulp with chelating agent and subsequent... Treatment of pulp with chelating agent and subsequent...

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 9/147 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2219767

A method of chlorine free bleaching of pulp of lignocellulosic material, comprising chelating agent treatment of the pulp and subsequent bleaching in at least one step with chlorine-free bleaching agents. According to the method, the pH value is held above 9 both in the chelating agent step and in subsequent bleaching steps.

Cette invention concerne un procédé de blanchiment sans chlore de pâte à papier constituée de matière ligno-cellulosique, ledit procédé consistant à traiter la pâte avec un agent chélateur et à procéder ensuite à son blanchiment, en au moins une étape, avec des agents de blanchiment ne contenant pas de chlore. Conformément à ce procédé, le PH est maintenu à une valeur supérieure à 9 lors de l'étape de traitement par l'agent chélateur et au cours des étapes ultérieures de blanchiment.

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