Abstract
Among biomass-derived compounds, lignin is an underused component with potential for conversion to industrial-needed products in biorefinery. In this study, organosolv fractionation of four lignocellulosic materials including bagasse (BG), pararubber wood sawdust (PS), palm fiber (PF), and cassava fiber (CF) was studied using a ternary solvent mixture comprising methyl isobutyl ketone (MIBK), ethanol, and water in the presence of H2SO4 to separate high-purity lignin. The fractionation reaction was performed at 160 °C for 40 min with MIBK/ethanol/water proportion of 0.25/0.42/0.33 and 0.025 M of H2SO4, which led to the highest lignin removal efficiency of 88.2, 70.6, 67.3, and 71.7% (w/w) from BG, PS, PF, and CF, respectively. Physicochemical characteristics of the fractionated lignin were determined for Klason lignin and by X-ray fluorescence spectroscopy, organic elemental analysis, 1H nuclear magnetic resonance spectroscopy, and Fourier transform infrared spectroscopy. The lignin samples were thermally depolymerized in MIBK to determine the content of specific lignin-derived chemicals. The main phenolic derivatives from BG-lignin were 4-ethylphenol and 4-vinylguaiacol, whereas those from PS-lignin were syringaldehyde and cis-isoeugenol. Phenol and bis(2-ethylhexyl) phthalate were mainly produced from depolymerization of PF-lignin while trans-isoeugenol and hexadecanoic acid were the major products from CF-lignin. This work demonstrates the potential of the fractionated lignin for production of valuable chemicals in biorefineries.
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Raita M. was supported by the Thailand Research Fund (TRG5980019). Laosiripojana N. was supported by the Thailand Research Fund (RTA5980006).
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Inkrod, C., Raita, M., Champreda, V. et al. Characteristics of Lignin Extracted from Different Lignocellulosic Materials via Organosolv Fractionation. Bioenerg. Res. 11, 277–290 (2018). https://doi.org/10.1007/s12155-018-9895-2
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DOI: https://doi.org/10.1007/s12155-018-9895-2