Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 65, Issue -, Pages 180-189Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2014.12.009
Keywords
Lignocellulose; Lewis acids; Acid pulping; Biomass pre-treatment; Characterization
Categories
Funding
- ANR Carnot Institute CED2
- INRA-CNRS GDR Biomatpro
- MENESR
- ENSCM
- CNRS
- INRA
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Lewis acids have been studied as catalysts in the organosolv treatment of wheat straw. Fractionation of the lignocellulosic biomass and fragmentation of lignin have been performed in aqueous ethanol in the presence of FeCl2, CuCl2, FeCl3, Ga(OTf)(3), ZrOCl2 or Sc(OTf)(3). The lignins were characterised in terms of molecular weight, beta-O-4 linkage content and chemical functions through size exclusion chromatography; thioacidolysis; P-31 and C-13 NMR spectroscopies. The degree of delignification and the yield of Klason lignin increased with the hardness of the Lewis acid. About half of the delignification products were Water-soluble monomers and oligomers. The nature of the Lewis acid influenced also the characteristics of the precipitated lignins. The molecular mash, the amount of OH groups and of aliphatic C-O bonds decreased as cation hardness increased. (C) 2014 Elsevier B.V. All rights reserved.
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