Fractionation of ‘water-soluble lignocellulose’ into C5/C6 sugars and sulfur-free lignins

  title={Fractionation of ‘water-soluble lignocellulose’ into C5/C6 sugars and sulfur-free lignins},
  author={Mats K{\"a}ldstr{\"o}m and Niklas Meine and Christophe Far{\'e}s and Roberto Rinaldi and Ferdi Sch{\"u}th},
  journal={Green Chemistry},
Recently, we demonstrated the mechanocatalytic depolymerization of lignocellulosic substrates as a powerful methodology that fully converts lignocellulosic substrates into ‘water-soluble lignocellulose’. We now show that the saccharification of the aqueous solution of depolymerized beechwood, pinewood and sugarcane bagasse (at 140 °C for 1 h) produces a high yield of sugars (e.g. 88–92% glucose, 3.5–8% glucose dimers and 93–98% xylose relative to the glucan and xylan fractions, respectively… 
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Reductive catalytic fractionation constitutes a promising approach to separate lignocellulose into a solid carbohydrate pulp and a stable liquid lignin oil. The process is able to extract and convert
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In the broad context of catalysis for lignin valorization, the term “recalcitrance” is often used to describe the resistance of lignin to undergo chemical transformations (generally, reductive


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Driven by mechanical forces, the acid-catalyzed depolymerization of solid biomass completely overcomes the problems posed by the recalcitrance of lignocellulose. The solid-state reaction leads to
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The solvent dimethylsulfoxide (DMSO)-d6 containing 1-ethyl-3-methylimidazolium acetate ([Emim]OAc) was able to dissolve lignocellulosic material completely and gave high-resolution 2D heteronuclear single quantum coherence (HSQC) NMR spectra of the entire array of wall polymers.
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A new procedure for the depolymerization of lignin and simultaneous conversion phenols into arenes is described, which can be rendered as a fundamental finding for the upgrade of bio-oils to arenes under mild conditions.