Wood liquefaction by ionic liquids
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Xie Honglu
Abstract
The liquefaction of wood (Metasequoia glyptostroboides) has been studied in two imidazole-based ionic liquids: IL1, 3,3′-ethane-1,2-diylbis(1-methyl-1H-imidazol-3-ium) dichloride; and IL2, 3,3′-ethane-1,2-diylbis(1-methyl-1H-imidazol-3-ium) dichloroaluminate. Rapid and complete liquefaction was obtained in IL2 without residue at 120°C for 25 min, in contrast to liquefaction in phenol/H2SO4 (liquid/wood ratio 20:1) with 25.9% residue. Temperature- and time-dependent studies indicate that the performance of the reagents investigated is IL2>IL1> phenol/H2SO4. The liquid/wood ratio and the amount of AlCl3 as catalyst affect the liquefaction rate. In the course of liquefaction with IL2, AlCl3 plays a dual role as a catalyst and a liquefaction reagent. Ionic liquids separated from the liquefied product can be recycled at least five times to maintain a good liquefaction rate.
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©2006 by Walter de Gruyter Berlin New York
Artikel in diesem Heft
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Artikel in diesem Heft
- A report from the 2005 Japanese-European Workshop on “Cellulose and Functional Polysaccharides”
- Determination of substituent distribution of viscoses by GPC
- Direct investigation of the structural properties of tension wood cellulose microfibrils using microbeam X-ray fibre diffraction
- Influence of amide content on the crystal structure of chitin
- Stepwise synthesis of chitooligosaccharides through a transition-state analogue substrate catalyzed by mutants of chitinase A1 from Bacillus circulans WL-12
- Synthesis of plantamajoside, a bioactive dihydroxyphenylethyl glycoside from Plantago major L.
- Diffusion of sulfide into Southern pine (Pinus taeda L.) and sweetgum (Liquidambar styraciflua L.) particles and chips
- Laccase-catalysed functionalisation of TMP with tyramine
- Wood liquefaction by ionic liquids
- Studies on the dehydrogenative polymerizations of monolignol β-glycosides. Part 2: Horseradish peroxidase-catalyzed dehydrogenative polymerization of isoconiferin
- Phenolic compounds in silver birch (Betula pendula Roth) wood
- Analysis of fragrance compositions of precious coniferous woods grown in Taiwan
- Influences of hot pressing temperature and surface structure on VOC emissions from OSB made of Scots pine
- Dimensional stability and photostability of octanoylated wood
- Measurement of the shear modulus of wood by the square-plate twist method
- Dielectric relaxation of water adsorbed on chemically treated woods
- Influences of drying on internal checking of spruce (Picea abies L.) heat-treated at 212°C
- The role of resol fortifiers in latex wood adhesives
- A simple anisotropy correction procedure for acoustic wood tomography
- Evaluating growth strain of Eucalyptus globulus Labill. from SilviScan measurements
- Density assessment of radiata pine: Sampling strategy revisited
