Journal
CHEMSUSCHEM
Volume 10, Issue 8, Pages 1692-1700Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201601795
Keywords
biomass; deep eutectic solvents; lignin; lignin-carbohydrate complexes; microwave chemistry
Funding
- National Natural Science Foundation of China [31670583, 31622016]
- Natural Science Foundation of Heilongjiang Province of China [JC2016002]
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Lignocellulosic biomass is an abundant and renewable resource for the production of biobased value-added fuels, chemicals, and materials, but its effective exploitation by an energy-efficient and environmentally friendly strategy remains a challenge. Herein, a facile approach for efficiently cleaving lignin-carbohydrate complexes and ultrafast fractionation of components from wood by microwave-assisted treatment with deep eutectic solvent is reported. The solvent was composed of sustainable choline chloride and oxalic acid dihydrate, and showed a hydrogen-bond acidity of 1.31. Efficient fractionation of lignocellulose with the solvent was realized by heating at 80 degrees C under 800W microwave irradiation for 3min. The extracted lignin showed a low molecular weight of 913, a low polydispersity of 1.25, and consisted of lignin oligomers with high purity (ca. 96%), and thus shows potential in downstream production of aromatic chemicals. The other dissolved matter mainly comprised glucose, xylose, and hydroxymethylfurfural. The undissolved material was cellulose with crystalI structure and a crystallinity of approximately 75%, which can be used for fabricating nanocellulose. Therefore, this work promotes an ultrafast lignin-first biorefinery approach while simultaneously keeping the undissolved cellulose available for further utilization. This work is expected to contribute to improving the economics of overall biorefining of lignocellulosic biomass.
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