A Review: Using Ionic Liquids for Lignin Extraction from Lignocellulose and High-Value Utilization

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Abstract
Lignocellulose is the most abundant renewable resource in nature, providing a large supply of lignin. The efficient separation and utilization of lignin from lignocellulose can help alleviate the current shortage of fossil fuels. Ionic liquids, as green solvents, have been widely applied in the field of biorefining. However, most research has focused on the extraction and purification of cellulose, while lignin is often treated as a by-product. The high-value utilization of lignin has currently emerged as a hot topic. This review summarizes recent advances in the extraction of lignin from lignocellulose using ionic liquids and the mechanisms of lignin extraction. Additionally, it briefly discusses the applications of ionic liquids in the high-value utilization of lignin, including lignin depolymerization, modification, the preparation of lignin-based functional materials, and biofuels. This review aims to provide ideas for the extraction and high-value utilization of lignin through ionic liquids.
Funding Information
  • National Key Research and Development Program of China (2021YFC2101900, 22178168, 21776130, 22308157, 22078150, BE2021083, BE2022791, SJCX23_0454)
  • National Natural Science Foundation of China (2021YFC2101900, 22178168, 21776130, 22308157, 22078150, BE2021083, BE2022791, SJCX23_0454)
  • Key research and development plan of Jiangsu Province (2021YFC2101900, 22178168, 21776130, 22308157, 22078150, BE2021083, BE2022791, SJCX23_0454)
  • Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (2021YFC2101900, 22178168, 21776130, 22308157, 22078150, BE2021083, BE2022791, SJCX23_0454)
  • Postgraduate Research & Practice Innovation Program of Jiangsu Province (2021YFC2101900, 22178168, 21776130, 22308157, 22078150, BE2021083, BE2022791, SJCX23_0454)

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