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Effects of an alkali-acid purification process on the characteristics of eucalyptus lignin fractionated from a MIBK-based organosolv process

AuthorsKlamrassamee, T.; Tana, Tana; Laosiripojana, N.; Moghaddam, L.; Zhang, Z.; Rencoret, Jorge ; Gutiérrez Suárez, Ana ; Río Andrade, José Carlos del ; Doherty, W.O.S.
Issue Date21-Sep-2016
PublisherRoyal Society of Chemistry (UK)
CitationRSC Advances 6: 92638- 92647 (2016)
AbstractIn this study, the effects of an alkali-acid purification process on the properties of eucalyptus lignin isolated from a methyl isobutyl ketone (MIBK)/methanol/water-based organosolv fractionation process were evaluated. The results showed that the treatment reduced the content of carbohydrates, ash, nitrogen and sulfur, and improved lignin solubility (up to 218%) in five organic solvents (acetone, methanol, ethanol, tetrahydrofuran and dimethyl sulfoxide) and removed lignin fractions with smaller molecular weights. However, analysis by Py-GC/MS, solid state NMR and 2D-HSQC NMR indicated that the alkali-acid treatment process did not cause changes to the monomeric lignin subunits and linkages of the lignin polymer. The treated lignin showed slightly higher thermal stability at temperatures <250 °C, though its maximum rate of decomposition occurred at 325 °C, 26 °C lower than that of the untreated lignin. On the basis of these results, the significant improvement in solvent solubility of the lignin by the treatment process will widen lignin application.
Description10 páginas.-- 5 figuras.-- 10 tablas.-- 39 referencias.-- Electronic supplementary information (ESI) available. See DOI:10.1039/c6ra20081h
Publisher version (URL)https://doi.org/10.1039/C6RA20081H
Identifiersdoi: 10.1039/c6ra20081h
issn: 2046-2069
Appears in Collections:(IRNAS) Artículos
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