1996 Fiscal Year Final Research Report Summary
Fractionation of main components in wind-fallen and thinning woods by continuous extraction with solvents at atmospheric pressure for utilization of poor-grade woods
| Project/Area Number |
06556026
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
林産学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
SANO Yoshihiro Hokkaido Univ., Fac.of Agr., Pro., 農学部, 教授 (10001463)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAI Mitsuo Hokkaido Univ., Grad.Sch.of Eng., Pro., 工学研究科, 教授 (50002019)
OZAWA Shuji Hokkaido Univ., Fac.of Agr., Instructor, 農学部, 助手 (50204194)
URAKI Yasumitsu Hokkaido Univ., Fac.of Agr., Assc.Pro., 農学部, 助教授 (90193961)
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| Project Period (FY) |
1994 – 1996
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| Keywords | acetic acid pulping / polyhydric alcohol pulping / poor-grade wood / biomass conversion / lignin carbon fiber / fibrous active carbon / thinning tree / organosolv pulping |
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| Research Abstract |
Poor-grade woods obtained from thinning, storm-fallen-down and short-rotation trees were subjected to pulpings by continuous extraction systmes with organic solvents in order to utilize valuable products. The woods from most of hardwood such as birch, poplar and beech, and from spruce and todomatsu (Abies sachalinensis Masters.) as softwood were possible to be separated into AcOH pulp, hemicellulose and lignin quantitatively by a solvent pulping system with aqueous acetic acid containing a small amount of sulfuric acid or hydrochloric acid at reflux temperatures. However, thinning woods from larch and sugi (Cryptomeria japonica D.Don) yielded PHA pulps with large amounts of residual lignin by this pulping process. The larch and sugi woods were possible to be pulped by a novel polyhydric alcohol process either with sulfuric acid at reflux temperature or with acetic acid at higher temperatures. Acetic acid and polyhydric alcohols for pulping solvents may be prepared from wood polysaccharides.
AcOH pulps had satsfactory properties for paper-making. The water solubles recovered as sugars from the waste liquor consisted mainly of monosaccharides such as xylose, mannose and so forth. The sugars appear to be utilized as diet sweeteners, medicines and chemicals. AcOH lignin could be converted to carbon fibers and fibrous active carbon with good quality by use of simple and economical methods because it has the characteristic hot-melting. PHA pulps had the properties for paper-grade and dissolving pulps. Lignin was recovered in quantity from the waste liquor. Hemicelluolse obtained together with the pulping solvent may be used several times for pulpings without recovery and conversion.
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