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

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Käldström,  Mats
Research Group Rinaldi, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Meine,  Niklas
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Farès,  Christophe
Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Rinaldi,  Roberto
Research Group Rinaldi, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth,  Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Käldström, M., Meine, N., Farès, C., Rinaldi, R., & Schüth, F. (2014). Fractionation of ‘water-soluble lignocellulose’ into C5/C6 sugars and sulfur-free lignins. Green Chemistry, 16(5), 2454-2462. doi:10.1039/C4GC00168K.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-DA4E-9
Abstract
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) and leads to precipitation of sulfur-free lignins. Noteworthy, the formation of furfurals is suppressed because the ‘water-soluble lignocelluloses’ undergo hydrolysis at relatively low temperatures. At 140 °C, 5-hydroxymethylfurfural and furfural are formed in yields not exceeding 1.4 and 5.7%, respectively. The separation of the carbohydrate fraction (as C5 and C6 sugars) from the lignin fraction is thus feasible by simple filtration.