期刊
JOURNAL OF WOOD SCIENCE
卷 61, 期 3, 页码 285-291出版社
SPRINGER JAPAN KK
DOI: 10.1007/s10086-015-1461-3
关键词
Milled wood lignin; Ionic liquid; 1-ethyl-3-methylimidazolium chloride; Reaction behavior; Heating method
资金
- JSPS [25450246]
- Grants-in-Aid for Scientific Research [25450246] Funding Source: KAKEN
We investigated the reaction behavior of milled wood lignin (MWL) obtained from Japanese cedar (Cryptomeria japonica) and Japanese beech (Fagus crenata) in an ionic liquid, 1-ethyl-3-methylimidazolium chloride ([C2mim][Cl]). This solvent can liquefy wood. The sample was treated with [C2mim][Cl] at 120 A degrees C using an oil bath or microwave irradiation. MWL easily dissolved in [C2mim][Cl]. Although solubilized, MWL was slightly depolymerized and it retained its high molecular weight after 96 h of treatment. Only small amounts of low molecular weight compounds such as vanillin, coniferylaldehyde, syringaldehyde and sinapylaldehyde were produced. As the treatment time was extended the chlorine from [C2mim][Cl] reacted with the MWL. These results indicate that MWL is stable in [C2mim][Cl] although limited depolymerization and modification by [C2mim][Cl] occurred.
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