Reaction behavior of lignin in supercritical methanol as studied with lignin model compounds
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- 南, 英治
- Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Kyoto University
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- 河本, 晴雄
- Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Kyoto University
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- 坂, 志朗
- Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Kyoto University
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The reaction behavior and kinetics of lignin model compounds were studied in supercritical methanol with a batch-type supercritical biomass conversion system. Guaiacol, veratrole, 2, 6-dimethoxyphenol, and 1, 2, 3-trimethoxybenzene were used as model compounds for aromatic rings in lignin. In addition, 5-5, β-1, β-O-4, and α-O-4 types of dimeric lignin model compounds were used as representatives of linkages in lignin. As a result, aromatic rings and 5-5 (biphenyl)-type structures were stable in supercritical methanol, and the β-1 linkage was not cleaved in the β-1-type structure but converted rapidly to stilbene. On the other hand, β-ether and α-ether linkages of β-O-4 and α-O-4 lignin model compounds were cleaved rapidly, and these compounds decomposed to some monomeric compounds. Phenolic compounds were found to be more reactive than nonphenolic compounds. These results indicate that cleavages of ether linkages mainly contribute to the depolymerization of lignin, whereas condensed linkages such as the 5-5 and β-1 types are not cleaved in supercritical methanol. Therefore, it is suggested that the supercritical methanol treatment effectively depolymerizes lignin into the lower-molecular-weight products as a methanol-soluble portion mainly by cleavage of the β-ether structure, which is the dominant linkage in lignin.
収録刊行物
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- Journal of Wood Science
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Journal of Wood Science 49 158-165, 2003-04
Springer Nature
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詳細情報 詳細情報について
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- CRID
- 1050285299725866368
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- NII論文ID
- 80015954214
- 120006823904
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- NII書誌ID
- AA11200007
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- ISSN
- 14350211
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- HANDLE
- 2433/250168
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- NDL書誌ID
- 6518127
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
- NDL
- CiNii Articles