Delignification mechanism during high-boiling solvent pulping -: Part 3.: Structural changes in lignin analyzed by 13C-NMR spectroscopy

被引：22

作者：

Kishimoto, T ^{[1
]}

Ueki, A ^{[1
]}

Sano, Y ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Agr, Div Appl Biosci, Lab Wood Chem,Res Grp Bioorgan Chem, Sapporo, Hokkaido 0608589, Japan

来源：

HOLZFORSCHUNG | 2003年 / 57卷 / 06期

关键词：

organosolv pulping; homolytic cleavage; hydrolysis benzyl ether; quantitative C-13-NMR; alpha-O-4-linkages; beta-O-4-linkages; acidolysis;

D O I：

10.1515/HF.2003.091

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

Milled wood lignin as well as wood meal from todo fir (Abies sachalinensis MAST) was treated with 70% aqueous 1,4-butanediol solution at 220degreesC without acid catalyst in order to elucidate the delignification mechanism during highboiling solvent (HBS) pulping. HBS lignin was recovered from black liquor by precipitation, and was subjected to gel permeation chromatography and quantitative C-13-NMR study. The average molecular weight of MWL decreased. The content of phenolic hydroxyl groups in MWL increased from 0.28 to 0.68/OMe. The decrease in the content of beta-O-4 substructures was evident, which may be attributed to the homolytic cleavage of phenolic beta-aryl ethers. The changes in the content of beta-5 and beta-beta substructures were rather small. The benzyl ether formation of beta-O-4 structures with 1,4-butanediol was also confirmed by C-13-NMR.However, the signals corresponding to Hibberts ketones were not observed, which suggests that acidolysis was not an important degradation pathway during HBS pulping.

引用

页码：602 / 610

页数：9

共 18 条

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