Influence of the chemical composition of kenaf [Hibiscus cannabinus] bast and core on the alkaline pulping response

The bast and core of kenaf, Hibiscus cannabinus L., have markedly different chemical components and alkaline cooking responses. The bast had about double the hot-water extractives content and only about half the lignin content of the core. The core contained a large amount of hemicellulose, mostly c...

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Bibliographic Details
Published in:Journal of wood science 2001-02, Vol.47 (1), p.30-35
Main Authors: Ohtani, Y. (Kochi Univ., Nankoku (Japan). Faculty of Agriculture), Mazumder, B.B, Sameshima, K
Format: Article
Language:English
Subjects:
CHEMICAL COMPOSITION
Cooking
EXTRACTS
HIBISCUS CANNABINUS
Kenaf
Lignin
LIGNINS
Organic chemistry
Protectors
PULPING
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Summary:The bast and core of kenaf, Hibiscus cannabinus L., have markedly different chemical components and alkaline cooking responses. The bast had about double the hot-water extractives content and only about half the lignin content of the core. The core contained a large amount of hemicellulose, mostly composed of xylan. The lignin structures of bast and core were also quite different: The former had a significant abundance of syringyl structures. Evidence showed that the bast was much more easily delignified than the core. When the bast and core were cooked together in alkaline condition, the pulp yields at the same kappa number were higher than those of the individual pulpings of bast and core. The bast-core pulping gave a positive effect on the yield of bast pulp in the sodaanthraquinone and kraft pulpings. On the other hand, kenaf was abundant in the hot water extractives. These extractives consumed alkali during cooking to a relatively large extent but acted as a protector of hemicellulose and slightly increased the pulp yields.
ISSN:1435-0211
1611-4663
DOI:10.1007/BF00776642