Influence of Anthraquinone Addition Method on Alkaline Pulping of Kenaf Bast.

Kenaf bast was pulped by several alkaline cookings. Soda-anthraquinone pulping is superior to soda pulping and comparable to kraft pulping with respect to pulp yield and delignification ability. All of three commercial anthraquinone and its precursors were effective for kenaf bast pulping in a same level, but a little difference between kenaf bast and wood pulpings was found. Anthraquinone could enhance the delignification but could not contribute to any yield increase in the kraft pulping of kenaf bast. Kenaf bast fiber resembles the fibers from woody basts, like as kozo, mitsumata and so on. But the detailed characteristics should be further elucidated.