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Polymers 2018, 10(10), 1157; https://doi.org/10.3390/polym10101157

Effects of Hydrothermal Pretreatment on the Structural Characteristics of Organosolv Lignin from Triarrhena lutarioriparia

1
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
2
Guangxi Key Laboratory of Clean Pulp and Papermaking and Pollution Control, Nanning 530004, China
*
Author to whom correspondence should be addressed.
Received: 28 August 2018 / Revised: 26 September 2018 / Accepted: 14 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Lignin Polymers: Structures, Reactions and Applications)
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Abstract

The effects of hydrothermal pretreatment (170–180 °C, 30–60 min) on the structural characteristics of enzymatic and extracted lignin from Triarrhena lutarioriparia (TL) during the integrated delignification process have been comprehensively investigated. Ion chromatography and NMR characterization showed that liquid products after mild hydrothermal process (170 °C, 30 min) were mainly composed of xylooligosaccharide (XOS) with different degrees of polymerization (DP ≥ 2). In addition, the structural changes of lignin during hydrothermal pretreatment and organic acid delignification process have been demonstrated by quantitative 2D heteronuclear single quantum coherence (2D-HSQC) and 31P-NMR techniques. Results showed that the structural changes of lignin (e.g., cleavage of β-O-4 linkages) induced by the hydrothermal pretreatment will facilitate the subsequent organic acid delignification process, and acetylated lignin could be obtained with a considerable yield, which can be used in lignin-based composite and candidate feedstock for catalytic upgrading of lignin. In short, the proposed process facilitates the producing of XOS and acetylated lignin for lignin valorization. View Full-Text
Keywords: Triarrhena lutarioriparia; quantitative heteronuclear-single-quantum-coherence spectra (HSQC); hydrothermal pretreatment; organosolv; lignin Triarrhena lutarioriparia; quantitative heteronuclear-single-quantum-coherence spectra (HSQC); hydrothermal pretreatment; organosolv; lignin
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Chen, T.; Li, Z.; Zhang, X.; Min, D.; Wu, Y.; Wen, J.; Yuan, T. Effects of Hydrothermal Pretreatment on the Structural Characteristics of Organosolv Lignin from Triarrhena lutarioriparia. Polymers 2018, 10, 1157.

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