Aqueous based ozone bleaching

Details Aqueous based ozone bleaching Aqueous based ozone bleaching

D - Textiles, Paper

21

C

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

Patent

CA 2194280

Cellulosic pulps are bleached with ozone in an ozone bleaching stage in an aqueous medium containing an additive in an effective amount not exceeding 5 % weight concentration of the aqueous medium. The additive is selected from a group consisting of N-alkylated ureas, N-alkylated lactams and N-alkylated amides. pH in the Z stage is operated under conventional ozone bleaching conditions, but preferably at high consistency and at low temperature, below 5 ~C.

On blanchit des pâtes cellulosiques avec de l'ozone à l'étape de blanchiment par l'ozone en utilisant un milieu aqueux contenant un additif en une quantité effective ne dépassant pas en poids 5 % du milieu aqueux. L'additif est choisi dans le groupe constitué par les urées N-alkylées, les lactames N-alkylés et les amides N-alkylés. Le pH à l'étape Z se situe dans la plage usuelle pour le blanchiment par l'ozone. De préférence, cette opération se fait sur une pâte épaisse et à une température basse, inférieure à 5 ~C.

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