Bleaching recycled pulp with ozone and hydrogen peroxide

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste


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162 7, 162 65, D21C 502




A method of bleaching recycled paper containing pulp wherein said pulp is contacted with ozone in an ozone stage (Z) treatment with 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. The pulp is first submitted to a test procedure to determine whether the pulp is more reactive to ozone in acidic or alkaline conditions, and if necessary the pH is accordingly adjusted.

patent: 3663357 (1972-05-01), Liebergott
patent: 4450044 (1984-05-01), Fritzvold et al.
patent: 5073301 (1991-12-01), Suess et al.
patent: 5211809 (1993-05-01), Naddeo et al.
patent: 5464501 (1995-11-01), Kogan et al.
Lierop et al "Bleaching of Secondary Fiber Pulps" First Research Forum on Recycling, Toronto, Oct. 1991.
Angulo, "Environmentally Safe Bleaching of Post Consumer Waste Papers" TAPPI pulping conference, Oct., 1990.
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Henricson "New Generation Kraft Pulping and Bleaching Technology" Paperi ja Puu, Apr. 1992.
"Ozone Bleaching of Recycled Paper" by Michel Muguet and Jack Kogan, presented at the 1992 Pulping Conference, Proc. Pulping Conf., vol. 1, pp. 75-80; Nov. 1-5,1992.


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