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

✍ Scribed by Kishimoto, T.; Tsuji, H.; Uraki, Y.; Sano, Y.

• Book ID: 124159116
• Publisher: Walter de Gruyter GmbH & Co. KG
• Year: 2003
• Tongue: German
• Weight: 130 KB
• Volume: 57
• Category: Article
• ISSN: 0018-3830
• DOI: 10.1515/HF.2003.027

✦ Synopsis

Summary

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 Z~1~Z~2~Z~3~ or Z~1~EZ~2~EZ~3~ bleaching sequence with a total ozone consumption of 2.17% on oven-dry pulp. The pulp from a Z~1~EZ~2~EZ~3~ sequence still contained 3.51% acetyl groups, which was 75% of the original amount of acetyl groups in unbleached acetic acid pulp.