Lignin is a renewable biopolymer from industrial crops that can be used for several value-added products. Moreover, lignin is an underexploited side stream of pulp and paper industries and biorefineries that is used for the production of energy at mill or as a low-value resource for dispersants or binding applications. In order to produce gasoline and high-value chemical products, an integrated process of separation and purification must be applied. Research in this field started in the early years of the 20th century, however, in recent decades a wide range of solvents have been proposed including organic (Organosolv) and ionic liquids (ILs). Therefore, the present review addresses the recent research advances in the separation and recovery of lignin, covering various solvents namely organic solvents (Organosolv) and ionic liquids (ILs). The finalisation of the ultimate industrially feasible process is still a required task and this study points out the most promising solvents, challenges and limitations for the selective lignin separation.

木质素是一种来自工业作物的可再生生物聚合物，可用于多种增值产品。此外，木质素是纸浆和造纸工业及生物精炼厂的未充分利用的侧流，可用于工厂的能源生产或作为分散剂或粘合剂应用的低价值资源。为了生产汽油和高价值的化学产品，必须采用分离和纯化的综合过程。该领域的研究始于20世纪初期，但是，在最近的几十年中，已经提出了各种各样的溶剂，包括有机（Organosolv）和离子液体（ILs）。因此，本文综述了木质素分离与回收的最新研究进展，涵盖了有机溶剂（Organosolv）和离子液体（ILs）等多种溶剂。