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Title: Steam-explosion pretreatment of wood: effect of chip size, acid, moisture content and pressure drop

Abstract

Material balances for pentosan, lignin, and hexosan, during steam-explosion pretreatment of aspenwood, showed almost quantitative recovery of cellulose in the water-insoluble fraction. Dilute acid impregnation resulted in more selective hydrolysis of pentosan relative to undesirable pyrolysis, and gave a more accessible substrate for enzymatic hydrolysis. Thermocouple probes, located inside simulated aspenwood chips heated in 240 degrees C-saturated steam, showed rapid heating of air-dry wood, whereas green or impregnated wood heated slowly. Small chips, 3.2 mm in the fiber direction, whether green or air dry gave approximately equal rates of pentosan destruction and solubilization, and similar yields of glucose and of total reducing sugars on enzmatic hydrolysis with Trichoderma harzianum. Partial pyrolysis, destroying one-third of the pentosan of aspenwood at atmospheric pressure by dry steam at 276 degrees C, gave little increase in yield of reducing sugars on enzymatic hydrolysis. Treatment with saturated steam at 240 degrees C gave essentially the same yields of butanediol and ethanol on fermentation with Klebsiella pneumoniae, whether or not 80% of the steam was bled off before explosion and even if the chips remained intact, showing that explosion was unnecessary. 17 references.

Authors:
; ;
Publication Date:
Research Org.:
Forintek Canada Corp., Ottawa
OSTI Identifier:
5296580
Resource Type:
Journal Article
Journal Name:
Biotechnol. Bioeng.; (United States)
Additional Journal Information:
Journal Volume: 28:6
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; WOOD; ACID HYDROLYSIS; ENZYMATIC HYDROLYSIS; HEAT TREATMENTS; HYDROLYSIS; ASPENS; BIOSYNTHESIS; CELLULOSE; ETHANOL; FLASH HEATING; GLUCOSE; KLEBSIELLA; MATERIAL BALANCE; MOISTURE; PYROLYSIS; STEAM; SUBSTRATES; TRICHODERMA; ALCOHOLS; ALDEHYDES; BACTERIA; CARBOHYDRATES; CHEMICAL REACTIONS; DECOMPOSITION; FUNGI; HEATING; HEXOSES; HYDROXY COMPOUNDS; LYSIS; MICROORGANISMS; MONOSACCHARIDES; ORGANIC COMPOUNDS; PLANTS; POLYSACCHARIDES; SACCHARIDES; SOLVOLYSIS; SYNTHESIS; THERMOCHEMICAL PROCESSES; TREES; 090222* - Alcohol Fuels- Preparation from Wastes or Biomass- (1976-1989); 140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)

Citation Formats

Brownell, H H, Yu, E K.C., and Saddler, J N. Steam-explosion pretreatment of wood: effect of chip size, acid, moisture content and pressure drop. United States: N. p., 1986. Web. doi:10.1002/bit.260280604.
Brownell, H H, Yu, E K.C., & Saddler, J N. Steam-explosion pretreatment of wood: effect of chip size, acid, moisture content and pressure drop. United States. https://doi.org/10.1002/bit.260280604
Brownell, H H, Yu, E K.C., and Saddler, J N. 1986. "Steam-explosion pretreatment of wood: effect of chip size, acid, moisture content and pressure drop". United States. https://doi.org/10.1002/bit.260280604.
@article{osti_5296580,
title = {Steam-explosion pretreatment of wood: effect of chip size, acid, moisture content and pressure drop},
author = {Brownell, H H and Yu, E K.C. and Saddler, J N},
abstractNote = {Material balances for pentosan, lignin, and hexosan, during steam-explosion pretreatment of aspenwood, showed almost quantitative recovery of cellulose in the water-insoluble fraction. Dilute acid impregnation resulted in more selective hydrolysis of pentosan relative to undesirable pyrolysis, and gave a more accessible substrate for enzymatic hydrolysis. Thermocouple probes, located inside simulated aspenwood chips heated in 240 degrees C-saturated steam, showed rapid heating of air-dry wood, whereas green or impregnated wood heated slowly. Small chips, 3.2 mm in the fiber direction, whether green or air dry gave approximately equal rates of pentosan destruction and solubilization, and similar yields of glucose and of total reducing sugars on enzmatic hydrolysis with Trichoderma harzianum. Partial pyrolysis, destroying one-third of the pentosan of aspenwood at atmospheric pressure by dry steam at 276 degrees C, gave little increase in yield of reducing sugars on enzymatic hydrolysis. Treatment with saturated steam at 240 degrees C gave essentially the same yields of butanediol and ethanol on fermentation with Klebsiella pneumoniae, whether or not 80% of the steam was bled off before explosion and even if the chips remained intact, showing that explosion was unnecessary. 17 references.},
doi = {10.1002/bit.260280604},
url = {https://www.osti.gov/biblio/5296580}, journal = {Biotechnol. Bioeng.; (United States)},
number = ,
volume = 28:6,
place = {United States},
year = {1986},
month = {6}
}