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Title: Maleic acid as a dicarboxylic acid hydrotrope for sustainable fractionation of wood at atmospheric pressure and ≤100 °C: mode and utility of lignin esterification

Source: Green Chemistry. 22(5): 1605-1617. https://doi.org/10.1039/c9gc04267a

Author(s)Cai, Cheng ; Hirth, Kolby ; Gleisner, Rolland ; Lou, Hongming ; Qiu, Xueqing ; Zhu, J. Y.

Publication Year: 2020  View PDF »

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

Abstract: This study evaluated maleic acid (MA) as a green hydrotrope for efficient wood fractionation at atmospheric pressure and ≤100 °C. MA hydrotropic fractionation (MAHF) resulted in esterified lignin with a low degree of condensation and a very light color. 2D 1H–13C HSQC and HMBC NMR analyses of reaction products of a lignin model compound guaiacylglycerol-beta-guaiacyl ether with MA identified bonding through the γ-OH group. The surface charge of lignocellulosic MAHF water insoluble solids (WIS), induced by lignin esterification (carboxylation), enhanced enzymatic sugar yield by reducing nonproductive cellulase binding to lignin through pH-mediated electrostatic repulsion and also enhanced the lubrication effect of lignin in mechanical nanofibrillation for producing cellulose nanofibrils from WIS. Preliminary studies indicated that disssolved xylan can be dehydrated into furfural by MA in the fractionated liquor at a good yield of 70% and MA can be reused for repeated fractionation with minimal loss of less than 5%.

Keywords: Maleic acid hydrotropic fractionation (MAHF); lignin esterification (carboxylation); 2D NMR; enzymatic hydrolysis; lignin containing cellulose nanofibrils (LCNF)

Publication Review Process: Formally Refereed

File size: 6,144 kb(s)

Date posted: 04/03/2020

This publication is also viewable on Treesearch:  view
RITS Product ID: 97494
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer
  

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