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Title: Preserving both lignin and cellulose chemical structures: flow-through acid hydrotropic fractionation at atmospheric pressure for complete wood valorization

Source: ACS Sustainable Chemistry & Engineering. 7(12): 10808-10820.

Author(s)Wang, Zhaojiang ; Qiu, Shi ; Hirth, Kolby ; Cheng, Jinlan ; Wen, Jialong ; Li, Ning ; Fang, Yunming ; Pan, Xuejun ; Zhu, J.Y.

Publication Year: 2019  View PDF »

Category: Journal Articles

Abstract: Poplar wood was rapidly fractionated via a flow-through reaction using aqueous solutions of an acid hydrotrope (AH), p-toluenesulfonic acid (p-TsOH), at temperatures below 98 °C. 13C−1H two-dimensional nuclear magnetic resonance (NMR) spectroscopic analyses demon-strated that the AH-solubilized lignins (AHLs) from a range of fractionation conditions with yields up to approximately 80% had a very high content of β-aryl-ether linkages compared to milled wood lignin (MWL) with a low enough condensation to facilitate subsequent reductive catalytic depolymerization resulting in a lignin monomer yield of over 30%. Gel-permeation chromatographic (GPC) and differential scanning calorimetric (DSC) analyses showed that the AHLs have high molecular weights and low glass transition temperatures Tg. These AHLs also have a pinkish color suitable for applications such as cosmetics and dye dispersants. AH fractionation (AHF) preserved the cellulose fraction as solid fibers also with a light pinkish color for the materials market and solubilized up to approximately 90% of xylan which can be converted to furfural using p-TsOH in the spent liquor without additional catalysts. The advantages herein are the use of one recyclable industrial chemical such as p-TsOH in an aqueous system below water boiling temperature to valorize all three major fractions of lignocelluloses in a short time frame, with very promising yields and well-preserved lignin and cellulose structure.

Keywords: Lignin valorization; reduced lignin condensation; acid hydrotrope fractionation (AHF); catalysis/depolymerization; 2D NMR

Publication Review Process: Formally Refereed

File size: 5,120 kb(s)

Date posted: 09/05/2019

This publication is also viewable on Treesearch:  view
RITS Product ID: 94906
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer
  

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