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Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
Published on: January 7, 2019
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Boron Lewis Acid Extraction of Wood Generates High Quality Lignin
Theodora E Leventis1, Patrick Judge2, Jialiang Zhang2
1The University of Iowa, Iowa City, Iowa 52242-1002, United States.
ACS Sustainable Chemistry & Engineering
|November 29, 2024
Summary
This study presents a boron Lewis acid method for lignocellulose separation, yielding high-quality lignin with low condensation. This approach enhances lignin
Area of Science:
- Biomass Valorization
- Green Chemistry
Background:
- Lignocellulose separation into lignin, cellulose, and hemicellulose is challenging.
- Lignin is an underutilized, valuable feedstock due to difficulties in its isolation with low modification.
- Developing efficient methods for lignin extraction is crucial for sustainable chemical industries.
Purpose of the Study:
- To investigate the properties of lignin-rich solids obtained from boron Lewis acid-mediated lignocellulose separation.
- To assess the effectiveness of boron Lewis acid extraction in preserving lignin's native structure.
- To evaluate the potential of boron lignin as a feedstock for chemical depolymerization.
Main Methods:
- Boron Lewis acid-mediated lignocellulose separation.
- Analysis of residual carbohydrates.
- Depolymerization efficiency studies.
- Heteronuclear Single Quantum Coherence (HSQC) and solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
- Benchmarking against alternative lignin sources.
Main Results:
- Boron Lewis acid extraction removed 80-85% of carbohydrates.
- The resulting boron lignin exhibited low condensation and high structural similarity to native lignin.
- Depolymerization of white pine boron lignin yielded 47% extractable monomers, comparable to state-of-the-art methods.
- Beechwood boron lignin showed instability upon aging or concentration, attributed to boron-mediated demethylation.
Conclusions:
- Boron Lewis acid extraction is an effective method for obtaining low-condensation lignin from lignocellulose.
- Boron lignin shows promise as a valuable feedstock, though stability issues need further investigation.
- This method offers a pathway to increase the utilization of lignin in biorefineries.
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