Kraft Lignin Depolymerization in an Ionic Liquid without a Catalyst
TL;DR: In this paper, the depolymerization of kraft lignin was successfully achieved by the thermal treatment of KG in butyl-1,8-diazabicyclo[5.4]undec-7-enium chloride ([DBUC4+][Cl-]) without a catalyst.
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Abstract: In this paper, the depolymerization of lignin was successfully achieved by the thermal treatment of kraft lignin in butyl-1,8-diazabicyclo[5.4.0]undec-7-enium chloride ([DBUC4+][Cl-]) without a catalyst. The thermal treatment experiments were performed in an oven at 150, 200, and 250 °C for 1 h. The changes in kraft lignin structure over the course of depolymerization were characterized by gel permeation chromatography (GPC), Fourier transform infrared (FTIR) spectroscopy, and 1H / 31P NMR analyses. GPC chromatograms indicated that the retention time of the original kraft lignin had shifted toward higher values after the thermal treatment, which indicated lignin depolymerization. The average molecular weight of the lignin obtained after 1 h reaction time decreased by 23, 70, and 58 wt% for the treatment at 150, 200, and 250 °C, respectively. FTIR spectra indicated the cleavage of β-O-4 bonds of kraft lignin. The 1H NMR spectra showed demethylation of all treated kraft lignins. Moreover, the 31P NMR analysis demonstrated that the demethylation phenomenon of the treated kraft lignin contributed to the formation of catechol groups.
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Citations
Lignin transformations for high value applications: towards targeted modifications using green chemistry
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Evguenii I. Kozliak,Alena Kubátová,Anastasia A. Artemyeva,Eric Nagel,Cheng Zhang,Rudresh Rajappagowda,Alevtina Smirnova +6 more
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References
The path forward for biofuels and biomaterials
Arthur J. Ragauskas,Charlotte K. Williams,Brian H. Davison,George J. P. Britovsek,John Cairney,Charles A. Eckert,William J. Frederick,Jason P. Hallett,David J. Leak,Charles L. Liotta,Jonathan R. Mielenz,Richard J. Murphy,Richard H. Templer,Timothy J. Tschaplinski +13 more
TL;DR: The integration of agroenergy crops and biorefinery manufacturing technologies offers the potential for the development of sustainable biopower and biomaterials that will lead to a new manufacturing paradigm.
5.8K
The Catalytic Valorization of Lignin for the Production of Renewable Chemicals
TL;DR: Biomass is an important feedstock for the renewable production of fuels, chemicals, and energy, and it recently surpassed hydroelectric energy as the largest domestic source of renewable energy.
4.2K
Lignin valorization: improving lignin processing in the biorefinery.
Arthur J. Ragauskas,Gregg T. Beckham,Mary J. Biddy,Richard P. Chandra,Fang Chen,Mark F. Davis,Brian H. Davison,Richard A. Dixon,Paul Gilna,Martin Keller,Paul Langan,Amit K. Naskar,John N. Saddler,Timothy J. Tschaplinski,Gerald A. Tuskan,Charles E. Wyman +15 more
TL;DR: Recent developments in genetic engineering, enhanced extraction methods, and a deeper understanding of the structure of lignin are yielding promising opportunities for efficient conversion of this renewable resource to carbon fibers, polymers, commodity chemicals, and fuels.
3.6K
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