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Effect of autohydrolysis of Eucalyptus globulus wood on lignin structure. Part 1: Comparison of different lignin fractions formed during water prehydrolysis
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Moritz Leschinsky
Published/Copyright:
November 6, 2008
Abstract
The effect of autohydrolysis of Eucalyptus globulus wood was studied with regard to conditions applied in a prehydrolysis-kraft process on the physico-chemical properties of lignin obtained in both the wood residue and hydrolysate. As a reference, milled wood lignin (MWL) was isolated from native wood and compared to three lignin fractions formed during prehydrolysis: 1) lignin from the wood residue isolated as MWL, 2) lignin precipitated from the prehydrolysate during cooling and separated by centrifugation, and 3) lignin degradation products soluble in the prehydrolysate extracted with ethylacetate. All lignin fractions were subjected to Fourier transform infrared (FTIR) spectroscopy, methoxy group determination, elemental analysis, size exclusion chromatography and quantitative nuclear magnetic resonance (NMR) spectroscopy. The results indicate that extensive lignin degradation occurs during prehydrolysis through homolytic cleavage of the aryl-ether bonds resulting in a substantial molecular weight loss of the residual lignin in the treated wood and in the lignin fractions isolated from the prehydrolysate. The aryl-ether cleavage is coupled with a strong increase in phenolic hydroxyl groups and a decrease in aliphatic hydroxyl groups. Indication for condensation reactions were found by NMR spectroscopy.
Keywords: autohydrolysis; biorefinery; lignin degradation; milled wood lignin (MWL); nuclear magnetic resonance (NMR); prehydrolysis kraft pulping; residual lignin
Received: 2008-6-14
Accepted: 2008-7-15
Published Online: 2008-11-06
Published in Print: 2008-11-01
©2008 by Walter de Gruyter Berlin New York
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Articles in the same Issue
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- Soda–AQ delignification of poplar wood. Part 1: Reaction mechanism and pulp properties
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Keywords for this article
autohydrolysis;
biorefinery;
lignin degradation;
milled wood lignin (MWL);
nuclear magnetic resonance (NMR);
prehydrolysis kraft pulping;
residual lignin
Articles in the same Issue
- Original Papers
- Soda–AQ delignification of poplar wood. Part 1: Reaction mechanism and pulp properties
- Soda-AQ delignification of poplar wood. Part 2: Further degradation of initially dissolved lignins
- Effect of autohydrolysis of Eucalyptus globulus wood on lignin structure. Part 1: Comparison of different lignin fractions formed during water prehydrolysis
- Effect of autohydrolysis of Eucalyptus globulus wood on lignin structure. Part 2: Influence of autohydrolysis intensity
- Extraction of galactoglucomannan from spruce wood with pressurised hot water
- Determination of ethylenic residues in wood and TMP of spruce by FT-Raman spectroscopy
- Quantitative assessment of total phenol contents of European oak (Quercus petraea and Quercus robur) by diffuse reflectance NIR spectroscopy on solid wood surfaces
- Valence band spectroscopy on lignin
- Analysis of acids and degradation products related to iron and sulfur in the Swedish warship Vasa
- Fenton-induced degradation of polyethylene glycol and oak holocellulose. A model experiment in comparison to changes observed in conserved waterlogged wood
- Towards novel wood-based materials: Chemical bonds between lignin-like model molecules and poly(furfuryl alcohol) studied by NMR
- Manufacture of laminated strand veneer (LSV) composite. Part 1: Optimization and characterization of thin strand veneers
- Manufacture of laminated strand veneer (LSV) composite. Part 2: Elastic and strength properties of laminate of thin strand veneers
- Flexural, in-plane shear and nail shear properties of falcataria-rubberwood laminated veneer board for flooring
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- Analysis of thermally treated wood samples using dynamic FT-IR-spectroscopy
- Observation of the influence of temperature on the mechanical properties of wood adhesives by nanoindentation
- Book review
- Identification of the timbers of Southeast Asia and the Western Pacific
- Personalia
- Prof. Dr. Olaf Schmidt retired at 65
- Contents Volume 62
- Contents Volume 62 (2008)
- Meeting
- Meetings
- Acknowledgement
- Acknowledgement
- Author index
- Author index
- Species index (scientific names)
- Species index (scientific names)
- Subject index
- Subject index
