Method for applying activated ozone in pulp bleaching

Details Method for applying activated ozone in pulp bleaching Method for applying activated ozone in pulp bleaching

D - Textiles, Paper

21

C

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

Patent

CA 2326311

An ozone based bleaching method for bleaching lignocellulosic materials comprising a bleaching sequence of at least four sequential stages, said stages including an oxidative treatment stage, an alkaline extraction stage, an activated ozone bleaching stage, and a final bleaching stage to produce a pulp of desired final brightness. The activated ozone bleaching stage comprises the addition of an ethanol/DMSO mixture to the pulp prior to the ozone reaction.

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