Characterization of the precipitated lignin from Japanese beech as treated by semi-flow hot-compressed water
Abstract
Japanese beech (Fagus crenata) was decomposed by a semi-flow process in hot-compressed water (HCW) at 150~230°C/10 MPa for 25 min. Mainly hemicelluloses and partly the lignin moiety of the wood was affected and liquefied in water. A part of the liquefied products can be precipitated after 12 h standing at ambient conditions. The precipitates are composed of around 90% of lignin, which was quantified and characterized by various chemical and spectroscopic methods in comparison of milled wood lignin (MWL), which is considered to be a representative compound for the native lignin in wood. The yield of the precipitated lignin (Lprecip) is higher than that of MWL and its syringyl content is also higher as demonstrated by alkaline nitrobenzene oxidation (NBO) giving rise to higher syringaldehyde/vanillin (SA/VA) ratios. Its OHphen group content was also high. The interpretation is that Lprecip is mainly from the secondary wall, and accordingly, the presented semi-flow HCW treatment offers the possibility for an efficient lignin isolation.
Acknowledgments
This work was supported by the Japan Science and Technology Agency (JST) under the Advanced Low Carbon Technology Research and Development Program (ALCA) and Kakenhi (No. 16J11212) a Grant-in-Aid for Japan Society for the Promotion of Science (JSPS) fellow, for which the authors are extremely grateful.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Carbon fibres from precursors produced by dry-jet wet-spinning of kraft lignin blended with kraft pulps
- Characterization of the precipitated lignin from Japanese beech as treated by semi-flow hot-compressed water
- Chemical effects of a mild torrefaction on the wood of eight Eucalyptus species
- Analysis of distribution of wood extractives in Gmelina arborea by gas chromatography and time-of-flight secondary ion mass spectrometry
- Water sorption hysteresis in wood: I review and experimental patterns – geometric characteristics of scanning curves
- Water sorption hysteresis in wood: II mathematical modeling – functions beyond data fitting
- Relations of density, polyethylene glycol treatment and moisture content with stiffness properties of Vasa oak samples
- Facile surface hydrophobization of medium-density fiberboard (MDF) by silver deposition
- Calibration of SilviScan data of Cryptomeria japonica wood concerning density and microfibril angles with NIR hyperspectral imaging with high spatial resolution
- Thermal diffusivity measurement of Phyllostachys edulis (Moso bamboo) by the flash method
- The effects of brown-rot decay on select wood properties of poplar (Populus cathayana Rehd.) and its mechanism of action
Artikel in diesem Heft
- Frontmatter
- Carbon fibres from precursors produced by dry-jet wet-spinning of kraft lignin blended with kraft pulps
- Characterization of the precipitated lignin from Japanese beech as treated by semi-flow hot-compressed water
- Chemical effects of a mild torrefaction on the wood of eight Eucalyptus species
- Analysis of distribution of wood extractives in Gmelina arborea by gas chromatography and time-of-flight secondary ion mass spectrometry
- Water sorption hysteresis in wood: I review and experimental patterns – geometric characteristics of scanning curves
- Water sorption hysteresis in wood: II mathematical modeling – functions beyond data fitting
- Relations of density, polyethylene glycol treatment and moisture content with stiffness properties of Vasa oak samples
- Facile surface hydrophobization of medium-density fiberboard (MDF) by silver deposition
- Calibration of SilviScan data of Cryptomeria japonica wood concerning density and microfibril angles with NIR hyperspectral imaging with high spatial resolution
- Thermal diffusivity measurement of Phyllostachys edulis (Moso bamboo) by the flash method
- The effects of brown-rot decay on select wood properties of poplar (Populus cathayana Rehd.) and its mechanism of action