Chlorine free process for bleaching lignocellulosic pulp

Details Chlorine free process for bleaching lignocellulosic pulp Chlorine free process for bleaching lignocellulosic pulp

D - Textiles, Paper

21

C

8/82

D21C 9/16 (2006.01)

Patent

CA 1132760

IP 2379 CHLORINE FREE PROCESS FOR BLEACHING LIGNOCELLULOSIC PULP Abstract A chlorine-free bleaching process for lignocellu- losic pulp characterized by a series of bleaching stages comprising in sequence a peroxide bleaching stage, the per oxide being selected from the group consisting of alkaline hydrogen peroxide, acidic hydrogen peroxide, and peroxy acid and at least one ozone bleaching stage and in one embodiment the sequence including an initial oxygen bleaching stage before the peroxide bleaching stage. In continuous opera- tion the effluent from each of these sequential stages pro- vides the preferred wash for the preceding washing step and the diluent for the preceding bleaching stage, the final effluent being recyclable for effective closed cycle operation.

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