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Title: Dissolution of less-processed wood fibers without bleaching in an ionic liquid: effect of lignin condensation on wood component dissolution

Source: International Journal of Biological Macromolecules. 134: 740-748.

Author(s)Wang, Huihui ; Hirth, Kolby ; Zhu, Junjun ; Ma, Qianli ; Liu, Chuanfu ; Zhu, J.Y.

Publication Year: 2019  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4709-1B

Abstract: This study evaluated the solubility of low-processed wood fibers produced from a low temperature acid hydrotropic fractionation (AHF) in an ionic liquid (IL) 1,5-diazabicyclo[4.3.0]non-5-enium acetate (DBNH[OAc]. Unbleached 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 ILDBNH[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 (Scond), 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 cellulosicfibers (MMCF).

Keywords: Lignin condensation; dissolution; dissolving pulp fibers; man-made cellulosic fibers; ionic liquid; textile

Publication Review Process: Formally Refereed

File size: 2,048 kb(s)

Date posted: 10/01/2019

This publication is also viewable on Treesearch:  view
RITS Product ID: 96352
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer

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