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Published on: January 7, 2019
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Lignin Depolymerization: A Comparison of Methods to Analyze Monomers and Oligomers.
Erika Bartolomei1, Yann Le Brech1, Anthony Dufour1
1LRGP, CNRS, Université de Lorraine, 1 rue Grandville, 54000, Nancy, France.
Chemsuschem
|June 10, 2020
Summary
UV fluorescence spectroscopy offers a rapid method to analyze lignin liquefaction products, distinguishing between monomers and oligomers. This technique aids in optimizing fuel and chemical production from biomass.
Area of Science:
- Biomass Conversion and Bioenergy
- Catalysis and Chemical Engineering
Background:
- Catalytic liquefaction of lignin produces valuable fuels and chemicals but yields complex mixtures of monomers and oligomers.
- Accurate analysis of these product distributions is challenging, hindering process optimization.
- Rapid characterization methods are essential for efficient screening of lignin liquefaction conditions.
Purpose of the Study:
- To introduce UV spectroscopy as a fast and simple method for assessing the composition of lignin-derived liquids.
- To develop a rapid analytical approach for screening lignin liquefaction conditions based on monomer and oligomer distribution.
Main Methods:
- Liquefaction of Soda lignin in ethanol using a Pt/C catalyst under hydrogen pressure (250°C, 110 bar).
- Sampling of liquefaction products at 30-minute intervals over 4 hours for isothermal analysis.
- Characterization using UV absorption and fluorescence spectroscopy, correlated with GC-MS, GPC, MALDI-TOF MS, and NMR.
Main Results:
- UV absorption and fluorescence spectroscopy effectively analyzed various model compounds and lignin liquefaction products.
- A strong correlation was observed between UV fluorescence data and results from advanced analytical techniques (GC-MS, GPC, MALDI-TOF MS, NMR).
- A novel depolymerization index derived from UV spectroscopy was proposed for rapid assessment of monomer-oligomer distribution.
Conclusions:
- UV spectroscopy provides a rapid, simple, and effective tool for characterizing the composition of lignin liquefaction products.
- The proposed depolymerization index enables quick screening of liquefaction conditions, facilitating process optimization.
- This method supports the efficient production of fuels and chemicals from lignin by simplifying product analysis.
