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Steam pretreatment of H2SO4-impregnated Salix for the production of bioethanol

Sassner, Per LU ; Martensson, Carl-Gustav; Galbe, Mats LU and Zacchi, Guido LU (2008) In Bioresource Technology 99(1). p.137-145
Abstract
In the bioconversion of lignocellulosic materials to ethanol, pretreatment of the material prior to enzymatic hydrolysis is essential to obtain high overall yields of sugar and ethanol. In this study, steam pretreatment of fast-growing Salix impregnated with sulfuric acid has been investigated by varying the temperature (180-210 degrees C), the residence time (4, 8 or 12 min), and the acid concentration (0.25% or 0.5% (w/w) H2SO4). High sugar recoveries were obtained after pretreatment, and the highest yields of glucose and xylose after the subsequent enzymatic hydrolysis step were 92% and 86% of the theoretical, respectively, based on the glucan and xylan contents of the raw material. The most favorable pretreatment conditions regarding... (More)
In the bioconversion of lignocellulosic materials to ethanol, pretreatment of the material prior to enzymatic hydrolysis is essential to obtain high overall yields of sugar and ethanol. In this study, steam pretreatment of fast-growing Salix impregnated with sulfuric acid has been investigated by varying the temperature (180-210 degrees C), the residence time (4, 8 or 12 min), and the acid concentration (0.25% or 0.5% (w/w) H2SO4). High sugar recoveries were obtained after pretreatment, and the highest yields of glucose and xylose after the subsequent enzymatic hydrolysis step were 92% and 86% of the theoretical, respectively, based on the glucan and xylan contents of the raw material. The most favorable pretreatment conditions regarding the overall sugar yield were 200 degrees C for either 4 or 8 min using 0.5% sulfuric acid, both resulting in a total of 55.6 g glucose and xylose per 100 g dry raw material. Simultaneous saccharification and fermentation experiments were performed on the pretreated slurries at an initial water-insoluble content of 5%, using ordinary baker's yeast. An overall theoretical ethanol yield of 79%, based on the glucan and mannan content in the raw material, was obtained. (C) 2006 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ethanol production, willow, steam pretreatment, salix, enzymatic, hydrolysis
in
Bioresource Technology
volume
99
issue
1
pages
137 - 145
publisher
Elsevier
external identifiers
  • wos:000250663700019
  • scopus:34848920434
ISSN
1873-2976
DOI
10.1016/j.biortech.2006.11.039
language
English
LU publication?
yes
id
bc3b0045-ea63-4503-b64d-970d77e75671 (old id 974430)
date added to LUP
2009-07-27 13:26:48
date last changed
2017-08-20 04:05:54
@article{bc3b0045-ea63-4503-b64d-970d77e75671,
  abstract     = {In the bioconversion of lignocellulosic materials to ethanol, pretreatment of the material prior to enzymatic hydrolysis is essential to obtain high overall yields of sugar and ethanol. In this study, steam pretreatment of fast-growing Salix impregnated with sulfuric acid has been investigated by varying the temperature (180-210 degrees C), the residence time (4, 8 or 12 min), and the acid concentration (0.25% or 0.5% (w/w) H2SO4). High sugar recoveries were obtained after pretreatment, and the highest yields of glucose and xylose after the subsequent enzymatic hydrolysis step were 92% and 86% of the theoretical, respectively, based on the glucan and xylan contents of the raw material. The most favorable pretreatment conditions regarding the overall sugar yield were 200 degrees C for either 4 or 8 min using 0.5% sulfuric acid, both resulting in a total of 55.6 g glucose and xylose per 100 g dry raw material. Simultaneous saccharification and fermentation experiments were performed on the pretreated slurries at an initial water-insoluble content of 5%, using ordinary baker's yeast. An overall theoretical ethanol yield of 79%, based on the glucan and mannan content in the raw material, was obtained. (C) 2006 Elsevier Ltd. All rights reserved.},
  author       = {Sassner, Per and Martensson, Carl-Gustav and Galbe, Mats and Zacchi, Guido},
  issn         = {1873-2976},
  keyword      = {ethanol production,willow,steam pretreatment,salix,enzymatic,hydrolysis},
  language     = {eng},
  number       = {1},
  pages        = {137--145},
  publisher    = {Elsevier},
  series       = {Bioresource Technology},
  title        = {Steam pretreatment of H2SO4-impregnated Salix for the production of bioethanol},
  url          = {http://dx.doi.org/10.1016/j.biortech.2006.11.039},
  volume       = {99},
  year         = {2008},
}