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Comparative Study of Acid Hydrolysis of Lignin and Polysaccharides in Biomasses
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. Federal University of Viçosa, Brazil.
2017 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 12, no 4, p. 6907-6923Article in journal (Refereed) Published
Abstract [en]

Effects of different acid hydrolysis conditions were studied relative to the chemical transformations of lignin in eucalyptus, sugarcane bagasse, and sugarcane straw, and on the transformations of multiple polysaccharides in eucalyptus. The acid hydrolysis using 12 mol/L sulfuric acid followed by acid hydrolysis using approximately 0.41 mol/L sulfuric acid was used as the reference for the lignin and sugar analysis. During acid hydrolysis, the relative amount of lignin increased with longer reaction times and/or greater acid concentrations for all biomasses. The overestimation of lignin in harsher acidic conditions resulted from the summation of lignocellulosic-derivatives (pseudo- lignin) together with lignin itself. Lignin reactions (dissolution/deposition) for bagasse and straw occurred in a greater extent than for eucalyptus, considering similar conditions of acid hydrolysis. The sugar transformation during acid hydrolysis was also investigated for eucalyptus. The sugar content quantified in eucalyptus decreased as the acid concentration and/or reaction time in the second hydrolysis increased. Glucose, galactose, and mannose were more resistant to harsher acidic conditions than xylose and arabinose. However, the most severe conditions (121 degrees C, 90 min, and 6.15 mol/L H2SO4) caused complete sugar degradation.

Place, publisher, year, edition, pages
North Carolina State University , 2017. Vol. 12, no 4, p. 6907-6923
Keywords [en]
Acid concentration, Eucalyptus wood, Klason lignin, Lignocellulosic biomasses, Sugarcane bagasse, Sugarcane straw
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-223310ISI: 000422879900003Scopus ID: 2-s2.0-85032625015OAI: oai:DiVA.org:kth-223310DiVA, id: diva2:1183227
Funder
EU, FP7, Seventh Framework Programme, KBBE-2009-3-244362 LignoDeco
Note

QC 20180216

Available from: 2018-02-16 Created: 2018-02-16 Last updated: 2018-06-19Bibliographically approved

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CiteExportLink to record
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