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Oxidative Depolymerization of Lignin in Ionic Liquids
Abstract
Beech lignin was oxidatively cleaved in ionic liquids to give phenols, unsaturated propylaromatics, and aromatic aldehydes. A multiparallel batch reactor system was used to screen different ionic liquids and metal catalysts. Mn(NO 3)2 in 1‐ethyl‐3‐methylimidazolium trifluoromethanesulfonate [EMIM][CF 3 SO 3] proved to be the most effective reaction system. A larger scale batch reaction with this system in a 300 mL autoclave (11 g lignin starting material) resulted in a maximum conversion of 66.3 % (24 h at 100 °C, 84×10 5 Pa air). By adjusting the reaction conditions and catalyst loading, the selectivity of the process could be shifted from syringaldehyde as the predominant product to 2,6‐dimethoxy‐1,4‐benzoquinone (DMBQ). Surprisingly, the latter could be isolated as a pure substance in 11.5 wt % overall yield by a simple extraction/crystallization process.
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Metadata
- Authors
- Stärk, K., Taccardi, N., Bösmann, A., & Wasserscheid, P.
- Venue
- ChemSusChem
- Publisher
- Wiley
- Published
- 2010-06-11
- Volume
- 3
- Issue
- 6
- Pages
- 719-723
- ISSN
- 1864-5631 (ISSN-L)
- 1864-564X
- OpenAlex
- W2003257483
- Cited by
- 232
- References
- 2
- FWCI
- 5.83
- Type
- journal article
- Language
- en
- Open access
- closed
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