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Title: Toward sustainable and complete wood valorization by fractionating lignin with low condensation using an acid hydrotrope at low temperatures (≤80 °C)

Source: Industrial & Engineering Chemistry Research. 58(17): 7063-7073.

Author(s)Cheng, Jinlan ; Hirth, Kolby ; Ma, Qianli ; Zhu, Junjun ; Wang, Zhaojiang ; Zhu, J. Y.

Publication Year: 2019  View PDF »

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

Abstract: Poplar wood was fractionated under a range of conditions using an inexpensive and recyclable commercial aromatic acid, p-toluenesulfonic acid (p-TsOH), as an acid hydrotrope (AH). The fractionated cellulose-rich solid fraction demonstrated excellent physical and optical properties as papermaking fibers. The dissolved xylose can be dehydrated into furfural using the p- TsOH in the spent liquor without additional catalysts. The acid hydrotrope dissolved lignin (AHL) has high β-aryl ether linkage content (∼60%) and high molecular weight (∼4000 Da), similar to that of mill wood lignin (MWL). Increasing acid hydrotrope fractionation (AHF) severity increased AHL yield, but reduced β-aryl ether bonds, decreased molecular weight and increased AHL glass transition temperature. An AHL yield of 50% can be obtained while retaining approximately half of the β-O-4 linkages, beneficial for lignin valorization as a polymer in composites as well as for production of monomers or aromatics through subsequent depolymerization.

Keywords: Lignocellulose fractionation; lignin depolymerization and condensation; acid hydrotrope; nuclear magnetic resonance (NMR); catalysis

Publication Review Process: Formally Refereed

File size: 8,192 kb(s)

Date posted: 08/27/2019

This publication is also viewable on Treesearch:  view
RITS Product ID: 94753
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer

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