Characterization of solvent-fractionated lignins from woody biomass treated via supercritical water oxidation. (March 2019)

• Record Type: Journal Article
• Authors: Ho Seo, Jin; Jeong, Hanseob; Lee, Hyung Won; Choi, Cheol Soon; Bae, Jin Ho; Lee, Soo Min; Kim, Yong Sik
• Is Part Of: Bioresource technology. Volume 275(2019)
• Page Start: 368
• Page End: 374
• Publication Date: 2019-03
• Subjects: Supercritical lignin -- Fractionation -- Characterization -- Molecular weight distribution; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.12.076
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Supercritical lignin was sequenced into five lignin fractions using four organic solvents. Each fraction represent different chemical compositions. The fraction with a higher MW exhibited improved thermal stability. Abstract: Crude supercritical lignin (SCL) extracted from hardwood ( Quercus mongolica ) treated via supercritical water (SCW) oxidation was subjected to sequential fractionation with four organic solvents; five lignin fractions (F1−F4 and FIN ) were thus obtained. The molecular weight (MW) of the fractionated lignins gradually increased as fractionation proceeded. However, the content of methoxyl groups and phenolic hydroxyl groups tended to decrease with increasing molecular weight of the lignins. The functional groups of SCL and the fractionated lignins were very similar based on Fourier-transform infrared analysis. The syringyl/guaiacyl ratio (S/G ratio) of the fractionated lignins increased with an increase in the MW. The thermal stability decreased with decreasing MW of the fractionated lignins, and all fractions except for F1 had a maximum degradation temperature of around 360 °C. The glass transition temperature ( Tg ) of the fractions increased from 83 °C to 137 °C with increasing MW.