JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Research Report (Original Paper)
Kraft Cooking with Teak Wood Extract and Determining Residual 2-Methylanthraquinone in Eucalyptus Pulp
Yulia AnitaAgusta Samodra PutraKeishi TanifujiAkiko Nakagawa-IzumiHiroshi OhiEvelyn Evelyn
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JOURNAL FREE ACCESS

2021 Volume 75 Issue 2 Pages 153-163

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Abstract

Anthraquinone(AQ)is used in the pulp and paper industries as a cooking catalyst. However, because AQ is “possibly carcinogenic”, it is no longer approved in Germany for the manufacture of paper and paperboard that contact food. To address this problem, we examined 2-methylanthraquinone(2-MAQ), a natural anthraquinone from teak(Tectona grandis)wood. Eucalyptus globulus wood was subjected to kraft cooking at 145℃ for 3 h with 0.03%2-MAQ and 15-19% active alkali to provide pulp in 55.5-58.1% yield. Kraft cooking with the acetone extract of Myanmar teak wood increased pulp yield by 1.6% but decreased kappa number by two points compared to that with only 2-MAQ. Ames testing suggests that 2-MAQ is not mutagenic. Unbleached and oxygen-bleached pulp contained 0.40- 2.90 ppm and 0.21-0.39 ppm residual 2-MAQ, respectively, while 2-MAQ was not detected in fully bleached pulp; therefore, this pulp should be safe for food-packaging use.

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© 2021 Japan Technical Association of the Pulp and Paper lndustry
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