Method of bleaching pulp without using chlorine-containing...

Details Method of bleaching pulp without using chlorine-containing... Method of bleaching pulp without using chlorine-containing...

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 9/02 (2006.01) D21C 9/147 (2006.01) D21C 11/00 (2006.01) D21C 11/04 (2006.01)

Patent

CA 2150254

The present invention relates to a process for producing pulp which is cooked under alkaline conditions and which is bleached without using chlorine-containing bleaching chemicals, in which process used cooking chemicals are recovered in a first recovery installation (18) and used bleaching chemicals are recovered in a second recovery installation (12), and, preferably, these bleaching chemicals are regenerated, wholly or in part, and reused in an oxygen-delignification stage (7) and/or in a TCF bleaching stage (9).

Procédé de production de pâte de cellulose qui est cuite dans des conditions alcalines et qui est blanchie sans utiliser de substances chimiques contenant du chlore, selon lequel les substances chimiques de cuisson et de blanchiment sont respectivement récupérées dans des première (18) et deuxième (12) installations de récupération et de préférence des substances chimiques de blanchiment sont régénérées entièrement ou partiellement et réutilisées dans un étage (7) de délignification à l'oxygène et/ou dans un étage (9) de blanchiment totalement dépourvu de chlore.

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