Production of sugars from wood using high-pressure hydrogen chloride
Saturating wood particles with HCl gas under pressure was found to be an effective pretreatment prior to subjecting wood to dilute acid hydrolysis. Pretreatment is necessary to release sugars from wood because of the tight lattice structure of cellulose. The HCl gas makes the cellulose more susceptible to subsequent acid hydrolysis and the glucose yield is doubled when dilute acid hydrolysis is preceded by HCl saturation at high pressure. The saturation was most effectively performed in a fluidized bed reactor, with pure HCl gas fluidizing an equal volume of ground wood plus inert particles. The fluidized bed effectively dissipated the large amount of heat released upon HCl absorption into the wood. Batch reaction times of 1 h at 315 psia gave glucose yields of 80% and xylose yields of 95% after dilute acid hydrolysis. A model was developed which proposed gas diffusing through the solid as limiting the reaction rate and this was found to effectively describe the HCl-wood reaction in the fluidized bed. The HCl was found to form a stable adduct with the lignin residue in the wood, in a ratio of 3.33 mols per mole of lignin monomer. The adduct was broken upon the addition of water. (Refs. 20).
- Research Organization:
- Univ. of California, Berkeley
- OSTI ID:
- 6701564
- Journal Information:
- Biotechnol. Bioeng.; (United States), Vol. 25:11
- Country of Publication:
- United States
- Language:
- English
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WOOD
ACID HYDROLYSIS
SACCHARIFICATION
ADDUCTS
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GLUCOSE
HYDROCHLORIC ACID
LIGNIN
MATHEMATICAL MODELS
MEDIUM PRESSURE
REACTION KINETICS
SACCHARIDES
SATURATION
VAPORS
ALDEHYDES
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DECOMPOSITION
FLUIDS
GASES
HEXOSES
HYDROGEN COMPOUNDS
HYDROLYSIS
INORGANIC ACIDS
KINETICS
LYSIS
MONOSACCHARIDES
ORGANIC COMPOUNDS
POLYSACCHARIDES
SOLVOLYSIS
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