Structural characterization of potassium hydroxide liquor lignin and its application in biorefinery

The structural characteristics of the lignin from potassium hydroxide (KOH) liquor of jute stick ( Corchorus capsularis ) pulping were determined and compared with the isolated dioxane lignin from jute stick. The lignin structure was characterized by elemental, methoxyl group analysis, UV, FTIR, 1 H...

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Bibliographic Details
Published in:Biomass conversion and biorefinery 2023, Vol.13 (2), p.727-737
Main Authors: Rahman, M. Mostafizur, Arafat, Kazi M. Yasin, Jin, Yangcan, Chen, Hui, Jahan, M. Sarwar
Format: Article
Language:English
Subjects:
Aromatic compounds
Biotechnology
Energy
Hydroxyl groups
Jute
Lignin
Molecular weight
NMR spectroscopy
Original Article
Phenol formaldehyde resins
Potassium hydroxides
Pulping
Renewable and Green Energy
Shear strength
Structural analysis
Weight reduction
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Summary:The structural characteristics of the lignin from potassium hydroxide (KOH) liquor of jute stick ( Corchorus capsularis ) pulping were determined and compared with the isolated dioxane lignin from jute stick. The lignin structure was characterized by elemental, methoxyl group analysis, UV, FTIR, 1 H-NMR, 31 P-NMR, and 2D-NMR spectroscopy and molecular weight. 2D-NMR of both lignins isolated showed a predominance of β-O-4 aryl ether linkages. KOH pulping cleaved β-O-4 aryl ether linkage and increased phenolic hydroxyl group and reduced molecular weight. KOH lignin can replace 40% phenol in phenol-formaldehyde resin with satisfactory shear strength.
ISSN:2190-6815
2190-6823
DOI:10.1007/s13399-020-01202-1