Autohydrolysis of birch wood
-
Lidia Testova
,
Sun-Li Chong
Abstract
Autohydrolysis of wood as a pretreatment stage before alkaline pulping is seen as an opportunity to approach the ideals of a forest biorefinery. In autohydrolysis the degradation products of primarily hemicelluloses and some other wood components are mainly dissolved (liquid phase) and they also escape partly as gas. In the present paper, birch was autohydrolysed at two intensity levels (characterised by P-factors of 200 and 1000) and the mass balances of autohydrolysis including solid, liquid, and gaseous phases were established. Approximately 10% and 25% of the total wood substance was transferred to the liquid phase at the two autohydrolysis intensities, respectively. In both cases about 50% of the degraded wood substance consisted of xylose-based material. The share of monomeric xylose was about 6% and 50% in the two samples, respectively. From the residual oligosaccharide fractions, 13% and 90% accounted for the DP2 to DP4 components in the P200 and P1000 samples, respectively. As expected, the weight-average molar mass of the components in the P1000 hydrolysate was substantially lower (0.4 kDa) than those in the corresponding P200 hydrolysate (2.1 kDa). Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) measurements revealed that relative to xylotriose the P1000 sample contained significantly fewer acidic pentosan fractions than the P200 sample. Xylooligosaccharides dissolved at both intensity levels remained highly acetylated, and some of these also carried 4-O-methylglucopyranosyluronic acid substituents.
©2011 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Editorial
- EWLP 2010, 16th–19th August 2010, Hamburg, Germany
- Review
- Bio based fuels and fuel additives from lignocellulose feedstock via the production of levulinic acid and furfural
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- Studies of the chemoenzymatic modification of cellulosic pulps by the laccase-TEMPO system
- Development of an integrated thermal and enzymatic hydrolysis for lignocellulosic biomass in fixed-bed reactors
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- Lignins as agents for bio-protection of wood
- Isolation and characterization of the phenolic fractions of wood pyrolytic oil
- Purification of Eucalyptus globulus water prehydrolyzates using the HiTAC process (high-temperature adsorption on activated charcoal)
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- Conditioning of SO2-ethanol-water spent liquor from spruce for the production of chemicals by ABE fermentation
- Total mass balances of SO2-ethanol-water (SEW) fractionation of forest biomass
- Lignin oxidation mechanisms under oxygen delignification conditions. Part 1. Results from direct analyses
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- Simplified determination of total lignin content in kraft lignin samples and black liquors
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- Dissolution of dissolving pulp in alkaline solvents after steam explosion pretreatments
- Structure and antioxidant activity of diarylheptanoids extracted from bark of grey alder (Alnus incana) and potential of biorefinery-based bark processing of European trees
- Short Note
- Binding affinities of different metal ions to unbleached hardwood kraft pulp
- Meetings
- Meetings
Articles in the same Issue
- Editorial
- EWLP 2010, 16th–19th August 2010, Hamburg, Germany
- Review
- Bio based fuels and fuel additives from lignocellulose feedstock via the production of levulinic acid and furfural
- Original Papers
- Optimization of steam pretreatment conditions for enzymatic hydrolysis of poplar wood
- Fungal pretreatment of pine wood to reduce the emission of volatile organic compounds
- Dilute acid pretreatment of starch-containing rice hulls for ethanol production
- Studies of the chemoenzymatic modification of cellulosic pulps by the laccase-TEMPO system
- Development of an integrated thermal and enzymatic hydrolysis for lignocellulosic biomass in fixed-bed reactors
- A larch based biorefinery: pre-extraction and extract fermentation to lactic acid
- Lignins as agents for bio-protection of wood
- Isolation and characterization of the phenolic fractions of wood pyrolytic oil
- Purification of Eucalyptus globulus water prehydrolyzates using the HiTAC process (high-temperature adsorption on activated charcoal)
- Disintegration and dissolution kinetics of wood chips in ionic liquids
- Ionic liquids as media for biomass processing: opportunities and restrictions
- Autohydrolysis of birch wood
- Solvent extraction as a means of preparing homogeneous lignin fractions
- Conditioning of SO2-ethanol-water spent liquor from spruce for the production of chemicals by ABE fermentation
- Total mass balances of SO2-ethanol-water (SEW) fractionation of forest biomass
- Lignin oxidation mechanisms under oxygen delignification conditions. Part 1. Results from direct analyses
- Lignin oxidation mechanisms under oxygen delignification conditions. Part 2: Advanced methods for the detailed characterization of lignin oxidation mechanisms
- Lignin oxidation mechanisms under oxygen delignification conditions. Part 3. Reaction pathways and modeling
- Simplified determination of total lignin content in kraft lignin samples and black liquors
- Xylan deposition onto eucalypt pulp fibers during oxygen delignification
- Dissolution of dissolving pulp in alkaline solvents after steam explosion pretreatments
- Structure and antioxidant activity of diarylheptanoids extracted from bark of grey alder (Alnus incana) and potential of biorefinery-based bark processing of European trees
- Short Note
- Binding affinities of different metal ions to unbleached hardwood kraft pulp
- Meetings
- Meetings
