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Production of ethanol from lignocellulosic materials

Hahn-Hägerdal, Bärbel LU ; Tjerneld, Folke LU and Zacchi, Guido LU (1988) In Animal Feed Science and Technology 21(2-4). p.175-182
Abstract
In the bioconversion of lignocellulosic materials to ethanol, the cost of the raw material and the cost of the enzymes have been identified as the major costs for the product. In addition, many lignocellulosic materials contain considerable amounts of five-carbon sugars which are not easily fermented to ethanol. The possibility of improving the cost-intensive steps was investigated.



The steam pre-treatment of a fast-growing species of Salix (Q082) was optimized with respect to treatment time and temperature, to give the best glucose yield after enzymatic hydrolysis. It was found that the semi-continuous production of cellulolytic enzymes with Trichoderem reesei Rutgers C30 in an aqueous two-phase system (an extractive... (More)
In the bioconversion of lignocellulosic materials to ethanol, the cost of the raw material and the cost of the enzymes have been identified as the major costs for the product. In addition, many lignocellulosic materials contain considerable amounts of five-carbon sugars which are not easily fermented to ethanol. The possibility of improving the cost-intensive steps was investigated.



The steam pre-treatment of a fast-growing species of Salix (Q082) was optimized with respect to treatment time and temperature, to give the best glucose yield after enzymatic hydrolysis. It was found that the semi-continuous production of cellulolytic enzymes with Trichoderem reesei Rutgers C30 in an aqueous two-phase system (an extractive fermentation system) increased the amount of recoverable enzyme activity compared with a batch process. It was also found that the enzyme consumption in the hydrolysis of cellulolytic materials, in filter paper units (FPU) g−1 reducing sugars (RS), could be considerably reduced by recirculating the cellulolytic enzymes in an aqueous two-phase system combined with an ultra-filtration unit. For the fermentation of pentoses, it was found that the combination of the commercial enzyme glucose isomerase and regular bakers' yeast, Saccharomyces cerevisiae, was superior to xylose fermenting yeasts. Yields and productivities comparable to those obtained in hexose fermentation could be achieved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Animal Feed Science and Technology
volume
21
issue
2-4
pages
175 - 182
publisher
Elsevier
external identifiers
  • wos:A1988Q904900007
  • scopus:0010332648
ISSN
0377-8401
DOI
10.1016/0377-8401(88)90098-3
language
English
LU publication?
yes
id
2eb0a65c-8765-48ff-bf9c-58945ffa0d4d (old id 3911624)
date added to LUP
2013-06-28 11:04:18
date last changed
2017-01-01 05:02:53
@article{2eb0a65c-8765-48ff-bf9c-58945ffa0d4d,
  abstract     = {In the bioconversion of lignocellulosic materials to ethanol, the cost of the raw material and the cost of the enzymes have been identified as the major costs for the product. In addition, many lignocellulosic materials contain considerable amounts of five-carbon sugars which are not easily fermented to ethanol. The possibility of improving the cost-intensive steps was investigated.<br/><br>
<br/><br>
The steam pre-treatment of a fast-growing species of Salix (Q082) was optimized with respect to treatment time and temperature, to give the best glucose yield after enzymatic hydrolysis. It was found that the semi-continuous production of cellulolytic enzymes with Trichoderem reesei Rutgers C30 in an aqueous two-phase system (an extractive fermentation system) increased the amount of recoverable enzyme activity compared with a batch process. It was also found that the enzyme consumption in the hydrolysis of cellulolytic materials, in filter paper units (FPU) g−1 reducing sugars (RS), could be considerably reduced by recirculating the cellulolytic enzymes in an aqueous two-phase system combined with an ultra-filtration unit. For the fermentation of pentoses, it was found that the combination of the commercial enzyme glucose isomerase and regular bakers' yeast, Saccharomyces cerevisiae, was superior to xylose fermenting yeasts. Yields and productivities comparable to those obtained in hexose fermentation could be achieved.},
  author       = {Hahn-Hägerdal, Bärbel and Tjerneld, Folke and Zacchi, Guido},
  issn         = {0377-8401},
  language     = {eng},
  number       = {2-4},
  pages        = {175--182},
  publisher    = {Elsevier},
  series       = {Animal Feed Science and Technology},
  title        = {Production of ethanol from lignocellulosic materials},
  url          = {http://dx.doi.org/10.1016/0377-8401(88)90098-3},
  volume       = {21},
  year         = {1988},
}