Bleaching recycled pulp with ozone and hydrogen peroxide

Details Bleaching recycled pulp with ozone and hydrogen peroxide Bleaching recycled pulp with ozone and hydrogen peroxide

D - Textiles, Paper

21

C

D21C 5/02 (2006.01) D21C 9/153 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2137450

A method of bleaching recycled paper containing pulp wherein said pulp is contacted with ozone in an ozone stage (Z) treatment comprising a brightness stabilizing step during or at the end of said ozone stage (Z), said stabilizing step consisting of contacting a small amount of hydrogen peroxide with said pulp, the amount of hydrogen peroxide contacted with said pulp being small compared to the amount of hydrogen peroxide usually in an hydrogen peroxide stage, no washing step of the pulp being provided between the ozone contacting step with said pulp and the hydrogen peroxide contacting step.

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