Efficient and Protective Upgrading of Uncondensed Lignin Extraction with High Yield and High Purity: Mechanistic Insights into Lewis Acid Catalysis Coupled with PEG Stabilization

enhanced the hydrogen-bonding capacity of the ternary DES with lignin, thereby aiding lignin dissociation and improving separation efficiency. This work provides valuable insights into upgrading lignin fractionation for lignin valorization.