Abstract
Lignin is an important component of lignocellulose, and its content in lignocellulose is 15%–35%, next to cellulose. Lignin is a kind of aromatic polymers with amorphous and complex structures, produced by enzymatic dehydrogenative polymerization with three phenylpropanoid monomers, that is, synapyl alcohol, coniferyl alcohol, and p -coumaryl alcohol. As a functional medium, ionic liquids (ILs) have some unique excellent physiochemical properties, such as high boiling point, non-volatile, designable. It has good solubility for lignin, which means the homogenization in the conversion process of lignin. Therefore, more and more attention has been paid to the catalytic conversion of lignin into high value-added chemicals in ILs. In this article, the research on the effective conversion of lignin and lignin model compounds into value-added aromatic compounds with ILs as solvents and/or catalysts is reviewed, and the challenges and opportunities in this field are analyzed and prospected.
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