Lignin, a renewable source of aromatic chemicals in nature, has attracted increasing\nattention due to its structure and application prospect. Catalytic solvolysis has developed as\na promising method for the production of value-added products from lignin. The liquefaction\nprocess is closely associated with heating methods, catalysts and solvents. Microwave assisted\nlignin liquefaction in hydrogen donor solvent with the presence of catalysts has been confirmed\nto be effective to promote the production of liquid fuels or fine chemicals. A great number of\nresearchers should be greatly appreciated on account of their contributions on the progress of\nmicrowave technology in lignin liquefaction. In this study, microwave assisted liquefaction of\nlignin in a hydrogen donor solvent is extensively overviewed, concerning the effect of different\nsolvents and catalysts. This review concludes that microwave assisted liquefaction is a promising\ntechnology for the valorization of lignin, which could reduce the reaction time, decrease the reaction\ntemperature, and finally fulfill the utilization of lignin in a relatively mild condition. In the future,\nheterogeneous catalysts with high catalytic activity and stability need to be prepared to achieve the\nneed for large-scale production of high-quality fuels and value-added chemicals from lignin.
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