New insights into the base catalyzed depolymerization of technical lignins: a systematic comparison.

However, there is an increasing trend to explore the upgrading of lignin residues to higher value products, to contribute to circular carbon economy. 7,8 Lignin is a heterogenous complex aromatic polymer consisting of methoxylated phenyl propane units connected by various C–C and C–O–C bonds, of which the β-O-4 aryl ether is most abundant. 9 As such, lignin could provide an excellent source of bio-based aromatic monomers, mainly phenolics.

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