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T. Kishimoto, H. Tsuji, Y. Uraki, Y. Sano

Ozone Bleaching of Atmospheric Acetic Acid Hardwood Pulp from Betula platyphylla var. japonica Hara

Atmospheric acetic acid pulp from Japanese white birch was bleached with 1–5% ozone with and without intermediate mild alkaline extraction. Concentrated acetic acid was a more effective bleaching media than water. Mild alkaline extraction of ozone-prebleached pulp was found to be very effective in delignification of the pulp and did not have any undesirable effects on pulp properties. A sufficiently delignified acetic acid pulp was obtained with multi-stage ozone bleaching in Z₁Z₂Z₃ or Z₁EZ₂EZ₃ bleaching sequence with a total ozone consumption of 2.17% on oven-dry pulp. The pulp from a Z₁EZ₂EZ₃ sequence still contained 3.51% acetyl groups, which was 75% of the original amount of acetyl groups in unbleached acetic acid pulp.

Holzforschung, Walter de Gruyter

Print ISSN: 0018-3830
Volume: 57, 02/2003
Pages: 181 - 188

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