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Preventing Lignin Condensation to Facilitate Aromatic Monomer Production

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Lignin is the most abundant aromatic polymer in nature and as such is an attractive source of aromatic molecules. Efficient lignin utilization will also likely play a key role in the economic success and sustainability of biomass valorization schemes. However, traditional strategies for lignin isolation and depolymerization suffer from repolymerization issues, which result in low yield of low molecular weight fragments. This review summarizes the recent progress in lignin isolation and depolymerization methods that are able to limit lignin condensation and facilitate the high yield production of monomers and oligomers. A general trend in these methods is that condensation and repolymerization is prevented by trapping reactive intermediates during extraction or depolymerization by chemically stabilizing the β–O–4 structure and/or its derivatives, or physically removing the separated lignin fragments from the reactor. We highlight the challenges and opportunities that these methods will face as they are further developed.
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Keywords: ACETAL; BIOMASS; DEPOLYMERIZATION; HYDROGENOLYSIS; LIGNIN; OXIDATION; REPOLYMERIZATION

Document Type: Research Article

Affiliations: 1: Laboratory of Sustainable and Catalytic Processing, Institute of Chemical Sciences and Engineering. École polytechnique fédérale de Lausanne (EPFL). CH-1015 Lausanne 2: Laboratory of Sustainable and Catalytic Processing, Institute of Chemical Sciences and Engineering. École polytechnique fédérale de Lausanne (EPFL). CH-1015 Lausanne;, Email: [email protected]

Publication date: August 1, 2019

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

    CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.

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