Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 134, Issue -, Pages 740-748Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.05.074
Keywords
Lignin condensation; Dissolution; Dissolving pulp fibers; Man-made cellulosic fibers; Ionic liquid; Textile
Funding
- Guangzhou Elite Project of China
- Chinese State Forestry Administration [2015-4-54]
- Chinese Scholarship Council (CSC)
- USDA Forest Products Laboratory (FPL)
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This study evaluated the solubility of low-processed wood fibers produced from a low temperature acid hydro tropic fractionation (AHF) in an ionic liquid (IL) 1,5-diazabicyclo[4.3.0]non-5-enium acetate (DBNHIOAcl. Un-bleached wood fibers produced from AHF using p-Toluenesulfonic acid (p-TsOH) with or without post treatments with lignin and hemicelluloses content up to 15% and 25%, respectively, were dissolved directly into the IL DBNH[OAc]. Post-AHF treatments using dilute alkaline and glycerol swelled the cellulose and partially removed residual lignin resulting in improved dissolution. Semi-quantitative 2D HSQC NMR analyses revealed that the undissolved wood fiber residues were enriched with G units and condensed S units (S-cond), demonstrating, as expected, that G units and condensed lignin substructures have a negative effect on dissolution in DBNH [OAc]. Therefore, AHF with rapid fractionation at low temperatures offers a promising advantage over existing high temperature pulp dissolving fiber (PDF) processes in terms of reducing energy input, lowering lignin content as well as reducing lignin condensation for producing man-made cellulosic fibers (MMCF). Published by Elsevier B.V.
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