Method to regenerate gas mixture in ozone-bleaching process

Details Method to regenerate gas mixture in ozone-bleaching process Method to regenerate gas mixture in ozone-bleaching process

D - Textiles, Paper

21

C

D21C 9/147 (2006.01) D21C 9/10 (2006.01) D21C 9/153 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2205182

A method of treating cellulose pulp which is subjected to an oxygen- delignification stage (3), a washing stage (4), an ozone-bleaching stage (1) and a further bleaching stage, for instance a peroxide-bleaching stage (7). A gas mixture of oxygen and ozone is delivered to the ozone-bleaching stage (1). The used gas mixture is regenerated, i.e. freed from carbon dioxide, and returned to the oxygen-delignification stage (3) and/or to a bleaching stage (7).

Procédé de traitement de pâte de cellulose passant par un étage (3) de délignification à l'oxygène, un étage (4) de lavage, un étage (1) de blanchiment à l'ozone ainsi qu'un autre étage de blanchiment, par exemple un étage (7) de blanchiment au peroxyde. Un mélange gazeux d'oxygène et d'ozone est acheminé jusqu'à l'étage (1) de blanchiment à l'ozone. Le mélange gazeux utilisé est régénéré, c'est-à-dire libéré du dioxyde de carbone, et renvoyé à l'étage (3) de délignification à l'oxygène et/ou à un étage (7) de blanchiment.

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