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

Klamrassamee, Thepparat, Tana, Tana, Laosiripojana, Navadol, Moghaddam, Lalehvash, Zhang, Zhanying, Rencoret, Jorge, Gutierrez, Ana, del Rio, Jose, & Doherty, William O.S. (2016) Effects of alkali-acid purification process on the characteristics of eucalyptus lignin fractionated from a MIBK-based organosolv process. RSC Advances. (In Press)

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Abstract

In this study, the effects of 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 contents 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.

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ID Code: 98931
Item Type: Journal Article
Refereed: Yes
DOI: 10.1039/C6RA20081H
ISSN: 2046-2069
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Research Centres > Centre for Tropical Crops and Biocommodities
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 Royal Society of Chemistry
Deposited On: 20 Sep 2016 22:36
Last Modified: 26 Oct 2016 06:45

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