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Title: Steam pretreatment of lignocellulosic material for enhanced enzymatic hydrolysis

Abstract

Pretreatment methods were compared with steam explosion, and differing views on the relative importance of mechanical and chemical effects were outlined. Hydrolysis was desirable; pyrolysis was undesirable. The effects of initial moisture content on steam consumption, mechanism and rate of heat transfer, pentosan solubilization, and subsequent glucose yield were summarized. The insignificant effect, after treatment at 240 degrees C, of 90% pressure bleed-down before explosion on subsequent simultaneous saccharification and fermentation (SSF) yields was described. Treatment at 190 degrees C with complete bleed-down (no explosion), when compared with that at 240 degrees C with explosion from full pressure, showed at least as good solubilization of pentosan, enzymatic hydrolysis, and SSF but showed greater pentosan destruction for the same degree of pentosan removal. Water washing of unexploded steamed aspenwood chips was at least as efficient as that of similarly treated but exploded chips. Scanning electron micrographs of unexploded chips showed extensive rupturing of vessel pit membranes and other morphological features associated with steam-exploded wood. Neither the explosion nor the high temperatures (above 190 degrees C) are necessary. 28 references.

Authors:
;
Publication Date:
Research Org.:
Forintek Canada Corp., Ottawa, Ontario
OSTI Identifier:
6561710
Resource Type:
Journal Article
Journal Name:
Biotechnol. Bioeng.; (United States)
Additional Journal Information:
Journal Volume: 29:2
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; WOOD; ENZYMATIC HYDROLYSIS; HEAT TREATMENTS; ASPENS; CELLULOSE; FERMENTATION; GLUCOSE; HEAT TRANSFER; LIGNIN; MOISTURE; SACCHARIFICATION; STEAM; ALDEHYDES; BIOCONVERSION; CARBOHYDRATES; CHEMICAL REACTIONS; DECOMPOSITION; ENERGY TRANSFER; HEXOSES; HYDROLYSIS; LYSIS; MONOSACCHARIDES; ORGANIC COMPOUNDS; PLANTS; POLYSACCHARIDES; SACCHARIDES; SOLVOLYSIS; TREES; 090222* - Alcohol Fuels- Preparation from Wastes or Biomass- (1976-1989); 140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)

Citation Formats

Brownell, H H, and Saddler, J N. Steam pretreatment of lignocellulosic material for enhanced enzymatic hydrolysis. United States: N. p., 1987. Web. doi:10.1002/bit.260290213.
Brownell, H H, & Saddler, J N. Steam pretreatment of lignocellulosic material for enhanced enzymatic hydrolysis. United States. https://doi.org/10.1002/bit.260290213
Brownell, H H, and Saddler, J N. 1987. "Steam pretreatment of lignocellulosic material for enhanced enzymatic hydrolysis". United States. https://doi.org/10.1002/bit.260290213.
@article{osti_6561710,
title = {Steam pretreatment of lignocellulosic material for enhanced enzymatic hydrolysis},
author = {Brownell, H H and Saddler, J N},
abstractNote = {Pretreatment methods were compared with steam explosion, and differing views on the relative importance of mechanical and chemical effects were outlined. Hydrolysis was desirable; pyrolysis was undesirable. The effects of initial moisture content on steam consumption, mechanism and rate of heat transfer, pentosan solubilization, and subsequent glucose yield were summarized. The insignificant effect, after treatment at 240 degrees C, of 90% pressure bleed-down before explosion on subsequent simultaneous saccharification and fermentation (SSF) yields was described. Treatment at 190 degrees C with complete bleed-down (no explosion), when compared with that at 240 degrees C with explosion from full pressure, showed at least as good solubilization of pentosan, enzymatic hydrolysis, and SSF but showed greater pentosan destruction for the same degree of pentosan removal. Water washing of unexploded steamed aspenwood chips was at least as efficient as that of similarly treated but exploded chips. Scanning electron micrographs of unexploded chips showed extensive rupturing of vessel pit membranes and other morphological features associated with steam-exploded wood. Neither the explosion nor the high temperatures (above 190 degrees C) are necessary. 28 references.},
doi = {10.1002/bit.260290213},
url = {https://www.osti.gov/biblio/6561710}, journal = {Biotechnol. Bioeng.; (United States)},
number = ,
volume = 29:2,
place = {United States},
year = {1987},
month = {2}
}