“…Given these properties of lignin, various applications have been widely recognized, such as additives for composite materials, antioxidants, anticancer agents, adsorbents for heavy metal ions and dyes, etc . Meanwhile, lignin as an aromatic polymer consisting of phenylpropane units can be further converted to value-added aromatics, fuels, etc . , Therefore, separating lignin from the nonedible biomass and further converting it into value-added compounds are attractive for practical applications. Nowadays, the main methods for lignin separation from lignocellulose include alkali treatment, acid treatment, organic solvent treatment, the use of sub- or supercritical technology, etc . , In the development of the lignin separation process from lignocellulose, finding the source of negligible lignin and a suitable solvent, and designing a low-energy cost process are the major concerns.…”