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Published on: March 9, 2021
Accelerated solvent extraction of lignin from Aleurites moluccana (Candlenut) nutshells
Andrew P Klein1, Evan S Beach, John W Emerson
1Center for Green Chemistry and Green Engineering, Yale University, 225 Prospect Street, New Haven, Connecticut 06511, USA.
Abstract:
Lignin from candlenut shells was isolated using an ethanol-water accelerated solvent extraction method. Yields (based on Klason lignin) increased from about 14 to 33% as temperature increased from 100 to 195 °C and were also influenced by the amount of aqueous acid used to precipitate lignin from the extraction liquor. These yields were higher than could be obtained using a conventional dioxane-water acidolysis method. The resulting lignin was characterized by IR, 31P NMR, and 1H-13C HMQC NMR spectroscopic techniques. The lignin contained predominantly guaiacyl units, and both the total hydroxyl group content and phenolic hydroxyl group content were high.
