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タイトル: | Reaction behavior of lignin in supercritical methanol as studied with lignin model compounds |
著者: | Minami, Eiji https://orcid.org/0000-0001-7434-2968 (unconfirmed) Kawamoto, Haruo https://orcid.org/0000-0002-4934-8054 (unconfirmed) Saka, Shiro |
著者名の別形: | 南, 英治 河本, 晴雄 坂, 志朗 |
キーワード: | Supercritical methanol Lignin model compound β-O-4 Linkage α-O-4 Linkage β-1 Linkage 5-5 Linkage |
発行日: | Apr-2003 |
出版者: | Springer Nature |
誌名: | Journal of Wood Science |
巻: | 49 |
開始ページ: | 158 |
終了ページ: | 165 |
抄録: | 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. |
著作権等: | This is a post-peer-review, pre-copyedit version of an article published in Journal of Wood Science. The final authenticated version is available online at: http://dx.doi.org/10.1007/s100860300025. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/250168 |
DOI(出版社版): | 10.1007/s100860300025 |
出現コレクション: | 学術雑誌掲載論文等 |
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