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Pretreatment of barley husk for bioethanol production

Palmarola Adrados, Beatriz LU ; Galbe, Mats LU and Zacchi, Guido LU (2005) In Journal of Chemical Technology and Biotechnology 80(1). p.85-91
Abstract
This paper reports on the optimization of steam pretreatment of barley husk for high pentose and hexose recovery in the subsequent enzymatic hydrolysis step, as well as high ethanol yield, following simultaneous saccharification and fermentation. The parameters optimized in the steam pretreatment step were residence time (5-15 min), temperature (190-215 degreesC), and concentration of the acid catalyst (0 or 0.5% H2SO4). A microwave oven was employed for screening of the optimal conditions to obtain the highest sugar yield following combined pretreatment and enzymatic hydrolysis. The final optimization of the pretreatment prior to enzymatic hydrolysis was performed on a larger scale, in a steam pretreatment unit. Simultaneous... (More)
This paper reports on the optimization of steam pretreatment of barley husk for high pentose and hexose recovery in the subsequent enzymatic hydrolysis step, as well as high ethanol yield, following simultaneous saccharification and fermentation. The parameters optimized in the steam pretreatment step were residence time (5-15 min), temperature (190-215 degreesC), and concentration of the acid catalyst (0 or 0.5% H2SO4). A microwave oven was employed for screening of the optimal conditions to obtain the highest sugar yield following combined pretreatment and enzymatic hydrolysis. The final optimization of the pretreatment prior to enzymatic hydrolysis was performed on a larger scale, in a steam pretreatment unit. Simultaneous saccharification and fermentation was carried out following steam pretreatment on 5 and 10% dry matter steam-pretreated slurries. Fermentability tests were performed to determine the effect of by-products (ie furfural and 5-hydroxymethyl furfural) in the bioconversion of glucose to ethanol by baker's yeast. The maximum glucose yield, 88% of the theoretical, was obtained following steam pretreatment with 0.5% H2SO4 at 200degreesC for 10 min. Under these conditions, a sugar to ethanol conversion of 81% was attained in simultaneous saccharification and fermentation. (C) 2004 Society of Chemical Industry. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Technology and Biotechnology
volume
80
issue
1
pages
85 - 91
publisher
Wiley-Blackwell
external identifiers
  • wos:000226040600013
  • scopus:11844279105
ISSN
0268-2575
DOI
10.1002/jctb.1161
language
English
LU publication?
yes
id
8a493486-6f6f-4b5e-9028-5c6ce257b4a8 (old id 151782)
date added to LUP
2007-06-25 14:35:57
date last changed
2017-10-01 04:36:31
@article{8a493486-6f6f-4b5e-9028-5c6ce257b4a8,
  abstract     = {This paper reports on the optimization of steam pretreatment of barley husk for high pentose and hexose recovery in the subsequent enzymatic hydrolysis step, as well as high ethanol yield, following simultaneous saccharification and fermentation. The parameters optimized in the steam pretreatment step were residence time (5-15 min), temperature (190-215 degreesC), and concentration of the acid catalyst (0 or 0.5% H2SO4). A microwave oven was employed for screening of the optimal conditions to obtain the highest sugar yield following combined pretreatment and enzymatic hydrolysis. The final optimization of the pretreatment prior to enzymatic hydrolysis was performed on a larger scale, in a steam pretreatment unit. Simultaneous saccharification and fermentation was carried out following steam pretreatment on 5 and 10% dry matter steam-pretreated slurries. Fermentability tests were performed to determine the effect of by-products (ie furfural and 5-hydroxymethyl furfural) in the bioconversion of glucose to ethanol by baker's yeast. The maximum glucose yield, 88% of the theoretical, was obtained following steam pretreatment with 0.5% H2SO4 at 200degreesC for 10 min. Under these conditions, a sugar to ethanol conversion of 81% was attained in simultaneous saccharification and fermentation. (C) 2004 Society of Chemical Industry.},
  author       = {Palmarola Adrados, Beatriz and Galbe, Mats and Zacchi, Guido},
  issn         = {0268-2575},
  language     = {eng},
  number       = {1},
  pages        = {85--91},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Chemical Technology and Biotechnology},
  title        = {Pretreatment of barley husk for bioethanol production},
  url          = {http://dx.doi.org/10.1002/jctb.1161},
  volume       = {80},
  year         = {2005},
}