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Bioethanol production from non-starch carbohydrate residues in process streams from a dry-mill ethanol plant.

Linde, Marie LU ; Galbe, Mats LU and Zacchi, Guido LU (2008) In Bioresource Technology 99(14). p.6505-6511
Abstract
Slurries obtained from process streams in a starch-to-ethanol plant, Agroetanol AB in Norrköping, Sweden, were used to assess the potential increase in bioethanol yield if heat treatment followed by enzymatic hydrolysis were applied to the residual starch-free cellulose and hemicellulose fractions. The effects of different pretreatment conditions on flour (the raw material), the stream after saccharification of starch, before fermentation, and after fermentation were studied. The conditions resulting in the highest concentration of glucose and xylose in all streams were heat treatment at 130 degrees C for 40min with 1% H(2)SO(4). Mass-balance calculations over the fermentation showed that approximately 64%, 54%, 75% and 67% of the glucan,... (More)
Slurries obtained from process streams in a starch-to-ethanol plant, Agroetanol AB in Norrköping, Sweden, were used to assess the potential increase in bioethanol yield if heat treatment followed by enzymatic hydrolysis were applied to the residual starch-free cellulose and hemicellulose fractions. The effects of different pretreatment conditions on flour (the raw material), the stream after saccharification of starch, before fermentation, and after fermentation were studied. The conditions resulting in the highest concentration of glucose and xylose in all streams were heat treatment at 130 degrees C for 40min with 1% H(2)SO(4). Mass-balance calculations over the fermentation showed that approximately 64%, 54%, 75% and 67% of the glucan, xylan, galactan and arabinan, respectively, in the flour remained water insoluble in the process stream after fermentation without any additional treatment. Utilizing only the starch in the flour would theoretically yield 425L ethanol per ton flour. By applying heat pretreatment to the water-insoluble material prior to enzymatic hydrolysis, the ethanol yield could be increased by 59L per ton flour, i.e. a 14% increase compared with starch-only utilization, assuming fermentation of the additional pentose and hexose sugars liberated. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cellulose, Starch, Bioethanol, Enzymatic hydrolysis, Pretreatment
in
Bioresource Technology
volume
99
issue
14
pages
6505 - 6511
publisher
Elsevier
external identifiers
  • pmid:18281213
  • wos:000257150800069
  • scopus:43849107666
ISSN
1873-2976
DOI
10.1016/j.biortech.2007.11.032
language
English
LU publication?
yes
id
0ab54c98-889f-494d-a0d1-9c6bd65bc7ad (old id 1041827)
date added to LUP
2008-03-25 15:10:00
date last changed
2017-05-14 03:59:34
@article{0ab54c98-889f-494d-a0d1-9c6bd65bc7ad,
  abstract     = {Slurries obtained from process streams in a starch-to-ethanol plant, Agroetanol AB in Norrköping, Sweden, were used to assess the potential increase in bioethanol yield if heat treatment followed by enzymatic hydrolysis were applied to the residual starch-free cellulose and hemicellulose fractions. The effects of different pretreatment conditions on flour (the raw material), the stream after saccharification of starch, before fermentation, and after fermentation were studied. The conditions resulting in the highest concentration of glucose and xylose in all streams were heat treatment at 130 degrees C for 40min with 1% H(2)SO(4). Mass-balance calculations over the fermentation showed that approximately 64%, 54%, 75% and 67% of the glucan, xylan, galactan and arabinan, respectively, in the flour remained water insoluble in the process stream after fermentation without any additional treatment. Utilizing only the starch in the flour would theoretically yield 425L ethanol per ton flour. By applying heat pretreatment to the water-insoluble material prior to enzymatic hydrolysis, the ethanol yield could be increased by 59L per ton flour, i.e. a 14% increase compared with starch-only utilization, assuming fermentation of the additional pentose and hexose sugars liberated.},
  author       = {Linde, Marie and Galbe, Mats and Zacchi, Guido},
  issn         = {1873-2976},
  keyword      = {Cellulose,Starch,Bioethanol,Enzymatic hydrolysis,Pretreatment},
  language     = {eng},
  number       = {14},
  pages        = {6505--6511},
  publisher    = {Elsevier},
  series       = {Bioresource Technology},
  title        = {Bioethanol production from non-starch carbohydrate residues in process streams from a dry-mill ethanol plant.},
  url          = {http://dx.doi.org/10.1016/j.biortech.2007.11.032},
  volume       = {99},
  year         = {2008},
}