期刊
CHEMSUSCHEM
卷 11, 期 2, 页码 439-448出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201701668
关键词
biomass; dealkylation; green chemistry; ionic liquids; lignin
资金
- LabEx Saclay Plant Sciences-SPS [ANR-10-LABX-552 0040-SPS]
- Bio Based Industries Joint Undertaking under the European Union's Horizon research and innovation program [720303]
The demethylation of lignin in ionic liquids (ILs) was investigated by using pure lignin model monomers and dimers together with dioxane-isolated lignins from poplar, miscanthus, and maize. Different methylimidazolium ILs were compared and the samples were treated with two different heating processes: microwave irradiation and conventional heating in a sealed tube. The conversion yield and influence of the treatment on the lignin structure were assessed by P-31 NMR spectroscopy, size-exclusion chromatography, and thioacidolysis. The acidic methylimidazolium IL [HMIM]Br was shown to be an effective combination of solvent and reagent for the demethylation and depolymerization of lignin. The relatively mild reaction conditions, the clean work-up, and the ability to reuse the IL makes the described procedure an attractive and new green method for the conversion of lignin to produce phenol-rich lignin oligomers.
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