Kumagawa and Soxhlet Solvent Fractionation of Lignin: The Impact on the Chemical Structure.

ABSTRACT: We investigated the effects of solvent fractionation on the chemical structures of two commercial technical lignins. We compared the effect of Soxhlet and Kumagawa extraction. The aim of this work was to compare the impact of the methods and of the solvents on lignin characteristics. Our investigation confirmed the potentialities of fractionation techniques in refining lignin properties and narrowing the molecular weight distribution. Furthermore, our study revealed that the Kumagawa process enhances the capacity of oxygenated solvents (ethanol and tetrahydrofuran) to extract lignin that contains oxidized groups and is characterized by higher average molecular weights. Furthermore, the use of tetrahydrofuran after ethanol treatment enabled the isolation of lignin with a higher ratio betwee

SUBMITTER: D'Orsi R 

PROVIDER: S-EPMC9330082 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature