Journal
JOURNAL OF SUPERCRITICAL FLUIDS
Volume 158, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.supflu.2019.104745
Keywords
Woody biomass; Catalyst; Organosolv fractionation; Crude lignin; Crude cellulose
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Agriculture and Agri-Food Canada (AAFC)
- Western Maple Bio Resources Inc. through BioMass Canada (BMC)-BioFuelNet cluster program - an Agri-Science Cluster
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A cost-effective process has been developed for fractionating pine sawdust into lignin and cellulose fractions in an ethanol-water mixed solvent. The effects of temperature, different types of catalysts (i.e., strong acid, weak acid and alkali), and residence time, with respect to yields and purity of the crude lignin (degraded products) and crude cellulose (solid residue) were investigated. It is found that the purity of crude lignin was higher but with a lower product yield under a weak acid or alkali catalysis in comparison to strong acid treatments. According to the analysis results, the optimal conditions for fractionation process were as follows: a mixed solvent of ethanol-water (1:1, v/v), 15 % formic acid (based on dry biomass), 180 degrees C, and 60 min. The yield of the resulted crude lignin was 29.2 % with a purity of 54.6 %, and yield of crude cellulose was 64.6 % with a high purity of 84.3 %. (C) 2019 Elsevier B.V. All rights reserved.
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