Unveiling Modifications of Biomass Polysaccharides during Thermal Treatment in Cholinium Chloride : Lactic Acid Deep Eutectic Solvent
authors Morais, ES; Lopes, AMD; Freire, MG; Freire, CSR; Silvestre, AJD
nationality International
journal CHEMSUSCHEM
author keywords biomass; deep eutectic solvents; green chemistry; polysaccharides; solvent stability
keywords LIGNOCELLULOSIC BIOMASS; CELLULOSE; LIGNIN; PRETREATMENT; FRACTIONATION; ETHANOL; WOOD; DES; HEMICELLULOSES; NANOPARTICLES
abstract A deep analysis upon the chemical modifications of the cellulose and hemicelluloses fractions that take place during biomass delignification with deep eutectic solvents (DES) is lacking in literature, being this a critical issue given the continued research on DES for this purpose. This work intends to fill this gap by disclosing a comprehensive study on the chemical modifications of cellulose (microcrystalline cellulose and bleached kraft pulp) and hemicelluloses (xylans) during thermal treatment (130 degrees C) with cholinium chloride/lactic acid ([Ch]Cl/LA) at molar ratio 1 : 10, one of the best reported DES for biomass delignification. The obtained data revealed that [Ch]Cl/LA (1 : 10) has a negative impact on the polysaccharides fractions at prolonged treatments (>4 h), resulting on substantial modifications including the esterification of cellulose with lactic acid, shortening of fibers length, fibers agglomeration and side reactions of the hemicelluloses fraction (e. g., humin formation, lactic acid grafting). Wood delignification trials with [Ch]Cl/LA (1 : 10) at the same conditions also corroborate these findings. Moreover, the DES suffers degradation, including the formation of lactic acid derivatives and its polymerization. Therefore, short time delignification treatments are strongly recommended when using the [Ch]Cl/LA DES, so that a sustainable fractionation of biomass into high quality cellulose fibers, isolated lignin, and xylose/furfural co-production along with solvent recyclability could be achieved.
publisher WILEY-V C H VERLAG GMBH
issn 1864-5631
isbn 1864-564X
year published 2021
volume 14
issue 2
beginning page 686
ending page 698
digital object identifier (doi) 10.1002/cssc.202002301
web of science category 13
subject category Chemistry, Multidisciplinary; Green & Sustainable Science & Technology
unique article identifier WOS:000594918800001
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journal analysis (jcr 2019):
journal impact factor 7.962
5 year journal impact factor 7.928
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