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Predicting lignin depolymerization yields from quantifiable properties using fractionated biorefinery lignins
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, USA.
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, USA.
Sustainable Biofuels and Co-Products Research Unit, Eastern Regional Research Center, USDA, ARS, 600 East Mermaid Lane, Wyndmoor, USA.
Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, USA.
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2017 (English)In: Green Chemistry, ISSN 1463-9262, E-ISSN 1463-9270, Vol. 19, no 21, 5131-5143 p.Article in journal (Refereed) Published
Abstract [en]

Lignin depolymerization to aromatic monomers with high yields and selectivity is essential for the economic feasibility of many lignin-valorization strategies within integrated biorefining processes. Importantly, the quality and properties of the lignin source play an essential role in impacting the conversion chemistry, yet this relationship between lignin properties and lignin susceptibility to depolymerization is not well established. In this study, we quantitatively demonstrate how the detrimental effect of a pretreatment process on the properties of lignins, particularly β-O-4 content, limit high yields of aromatic monomers using three lignin depolymerization approaches: thioacidolysis, hydrogenolysis, and oxidation. Through pH-based fractionation of alkali-solubilized lignin from hybrid poplar, this study demonstrates that the properties of lignin, namely β-O-4 linkages, phenolic hydroxyl groups, molecular weight, and S/G ratios exhibit strong correlations with each other even after pretreatment. Furthermore, the differences in these properties lead to discernible trends in aromatic monomer yields using the three depolymerization techniques. Based on the interdependency of alkali lignin properties and its susceptibility to depolymerization, a model for the prediction of monomer yields was developed and validated for depolymerization by quantitative thioacidolysis. These results highlight the importance of the lignin properties for their suitability for an ether-cleaving depolymerization process, since the theoretical monomer yields grows as a second order function of the β-O-4 content. Therefore, this research encourages and provides a reference tool for future studies to identify new methods for lignin-first biomass pretreatment and lignin valorization that emphasize preservation of lignin qualities, apart from focusing on optimization of reaction conditions and catalyst selection.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017. Vol. 19, no 21, 5131-5143 p.
National Category
Bioprocess Technology
Research subject
Biochemical Process Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-66227DOI: 10.1039/C7GC02023FISI: 000414147100014Scopus ID: 2-s2.0-85032741346OAI: oai:DiVA.org:ltu-66227DiVA: diva2:1151516
Note

Validerad;2017;Nivå 2;2017-11-14(andbra)

Available from: 2017-10-23 Created: 2017-10-23 Last updated: 2017-11-24Bibliographically approved

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