Methods for applying ozone in ecf bleaching

Details Methods for applying ozone in ecf bleaching Methods for applying ozone in ecf bleaching

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) D21C 9/10 (2006.01) D21C 9/14 (2006.01)

Patent

CA 2245535

A ECF bleaching method for bleaching lignocellulosic materials comprising a bleaching sequence of at least three sequential stages, said stages including an oxidative treatment stage, an alkaline extraction stage, and an acidification bleaching treatment stage using ozone.

Divulgation d'une méthode de blanchiment ECF (sans chlore élémentaire) pour blanchir des matières lignocellulosiques. Cette méthode comprend une phase de blanchiment constituée d'au moins trois étapes séquentielles, ces étapes consistant en une étape de traitement oxydant, en une étape d'extraction alcaline et en une étape de blanchiment et d'acidification à l'aide d'ozone.

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