Abstract
Several lignin samples of varying botanical nature (softwood, hardwood, or annual plants) and extraction procedures (Kraft, Organosolv, or soda) were fully characterized by complementary techniques and engaged in “catalyst-free” depolymerization in air under basic conditions. Treatment of the complex reaction mixture was optimized to ensure reproducibility, careful analyses, and accurate data. After an optimization of the reaction conditions, we were able to recover high amounts of aromatic compounds (up to 19%wt). Additionally, we demonstrated a relation between lignin’s structure, i.e., the accessible phenol moieties and inter-unit linkages, and the yields of aromatic compounds, thus showing the importance of the extraction process to optimize lignin’s potential. This work provides valuable reference for developing further lignin depolymerization under basic media.
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Acknowledgments
The authors thank C. Lorentz for her help with the NMR analyses. The authors thank AXELERA, cluster for the chemical and environmental sectors, for support.
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The authors gratefully acknowledge the National Agency of Research (CHEMLIVAL No. ANR-12-CDII-0001_01) for funding. C. C. A. thanks the National Agency of Research (CHEMLIVAL No. ANR-12-CDII-0001_01) for grant. A. K. thanks GDRI (International Research Network) “Catalytic upgrading of Biomass” for grant.
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Characterization of lignins (1H NMR, 13C NMR, 31P NMR, and HSQC NMR spectra); General information for the depolymerization of lignins under oxidative conditions in the absence of catalyst and associated analytical data as HSQC NMR spectra. (DOCX 7584 kb).
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Cabral Almada, C., Kazachenko, A., Fongarland, P. et al. Oxidative depolymerization of lignins for producing aromatics: variation of botanical origin and extraction methods. Biomass Conv. Bioref. 12, 3795–3808 (2022). https://doi.org/10.1007/s13399-020-00897-6
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DOI: https://doi.org/10.1007/s13399-020-00897-6