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Related Experiment Video

Updated: Jul 19, 2025

Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
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Mechanistic Insights into Formation of Residual Solid in Lignin Depolymerization.

Kaiqi Lv1, Zhengjian Chen2, Jiaheng Zhang2

  • 1School of Chemistry and Chemical Engineering, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, P.R. China.

Chemsuschem
|August 7, 2023
PubMed
Summary
This summary is machine-generated.

Understanding lignin char formation is key to improving its conversion efficiency. This study reveals char primarily contains G-units and forms via new methylene bridges, offering insights for better lignin valorization.

Keywords:
guaiacyl unithydrothermal depolymerizationligninmechanismresidual solid

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Area of Science:

  • Biomass Conversion and Biorefining
  • Organic Chemistry
  • Materials Science

Background:

  • Lignin conversion efficiency is limited by char formation, hindering effective biomass valorization.
  • A deeper mechanistic understanding of charring pathways is crucial for optimizing lignin depolymerization.

Purpose of the Study:

  • To elucidate the fundamental mechanism of char formation during lignin depolymerization.
  • To identify the lignin structural units and reaction pathways contributing to char generation.

Main Methods:

  • Hydrothermal decomposition of lignin as a model reaction.
  • Characterization of char composition and structure.
  • Density functional theory (DFT) calculations to verify proposed mechanisms.

Main Results:

  • Char formation is linked to G-lignin units and demethoxylation of S-lignin.
  • New methylene bridges form between lignin aromatic rings, leading to recalcitrant char.
  • H-lignin preferentially forms volatile monophenols, not char.

Conclusions:

  • A detailed mechanism for char formation in lignin hydrothermal decomposition is proposed.
  • Controlling lignin composition and reaction conditions can mitigate char formation and enhance carbon utilization.
  • This research provides a foundation for developing more efficient lignin valorization strategies.