Possible dissolution mechanism of alkali lignin in lactic acid-choline chloride under mild conditions
Zhuang Liu, Yi Hou, Song‐Qing Hu, Youming Li
Abstract
H and HSQC NMR spectroscopies revealed an important possible dissolution mechanism of AL in LA-ChCl, that is, AL could be depolymerized under the action of LA when dissolved in LA-ChCl. Then, a new connection would form between the phenolic groups on the lignin fragments and ChCl, which is similar to that between ChCl and LA in DES, leading to an increase in the molecule weight of lignin. The new connections could be easily broken under the action of heat (150 °C) or microwave to the redispersion of lignin fragments. The results would provide a theoretic base for the high-value application of lignin in bioresources.
Topics & Concepts
SolubilityChemistryLigninDissolutionCholine chlorideAlkali metalLactic acidOrganic chemistryChlorideGel permeation chromatographyNuclear chemistryPolymerGeneticsBiologyBacteriaLignin and Wood ChemistryFermentation and Sensory AnalysisBiochemical and biochemical processes