Steam pretreatment of acid-sprayed and acid-soaked barley straw for production of ethanol
(2006) In Applied Biochemistry and Biotechnology 130(1-3). p.546-562- Abstract
- Barley is an abundant crop in Europe, which makes its straw residues an interesting cellulose source for ethanol production. Steam pretreatment of the straw followed by enzymatic hydrolysis converts the cellulose to fermentable sugars. Prior to pretreatment the material is impregnated with a catalyst, for example, H2SO4, to enhance enzymatic digestibility of the pretreated straw. Different impregnation techniques can be applied. In this study, soaking and spraying were investigated and compared at the same pretreatment condition in terms of overall yield of glucose and xylose. The overall yield includes the soluble sugars in the liquid from pretreatment, including soluble oligomers, and monomer sugars obtained in the enzymatic hydrolysis.... (More)
- Barley is an abundant crop in Europe, which makes its straw residues an interesting cellulose source for ethanol production. Steam pretreatment of the straw followed by enzymatic hydrolysis converts the cellulose to fermentable sugars. Prior to pretreatment the material is impregnated with a catalyst, for example, H2SO4, to enhance enzymatic digestibility of the pretreated straw. Different impregnation techniques can be applied. In this study, soaking and spraying were investigated and compared at the same pretreatment condition in terms of overall yield of glucose and xylose. The overall yield includes the soluble sugars in the liquid from pretreatment, including soluble oligomers, and monomer sugars obtained in the enzymatic hydrolysis. The yields obtained differed for the impregnation techniques. Acid-soaked barley straw gave the highest overall yield of glucose, regardless of impregnation time (10 or 30 min) or acid concentration (0.2 or 1.0 wt%). For xylose, soaking gave the highest overall yield at 0.2 wt% H2SO4. An increase in acid concentration resulted in a decrease in xylose yield for both acid-soaked and acid-sprayed barley straw. Optimization of the pretreatment conditions for acid-sprayed barley straw was performed to obtain yields using spraying that were as high as those with soaking. For acid-sprayed barley straw the optimum pretreatment condition for glucose, 1.0 wt% H2SO4 and 220 degrees C for 5 min, gave an overall glucose yield of 92% of theoretical based on the composition of the raw material. Pretreatment with 0.2 wt% H2SO4 at 190 degrees C for 5 min resulted in the highest overall xylose yield, 67% of theoretical based on the composition of the raw material. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1410569
- author
- Linde, Marie LU ; Galbe, Mats LU and Zacchi, Guido LU
- organization
- publishing date
- 2006
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- enzymatic hydrolysis, barley straw, pretreatment, ethanol, H2SO4
- in
- Applied Biochemistry and Biotechnology
- volume
- 130
- issue
- 1-3
- pages
- 546 - 562
- publisher
- Humana Press
- external identifiers
-
- wos:000203004900018
- scopus:33646925201
- ISSN
- 1559-0291
- language
- English
- LU publication?
- yes
- id
- 110c4f8d-8eea-43af-acfb-91153fbf2012 (old id 1410569)
- date added to LUP
- 2016-04-01 12:24:21
- date last changed
- 2023-11-11 23:52:50
@article{110c4f8d-8eea-43af-acfb-91153fbf2012,
abstract = {{Barley is an abundant crop in Europe, which makes its straw residues an interesting cellulose source for ethanol production. Steam pretreatment of the straw followed by enzymatic hydrolysis converts the cellulose to fermentable sugars. Prior to pretreatment the material is impregnated with a catalyst, for example, H2SO4, to enhance enzymatic digestibility of the pretreated straw. Different impregnation techniques can be applied. In this study, soaking and spraying were investigated and compared at the same pretreatment condition in terms of overall yield of glucose and xylose. The overall yield includes the soluble sugars in the liquid from pretreatment, including soluble oligomers, and monomer sugars obtained in the enzymatic hydrolysis. The yields obtained differed for the impregnation techniques. Acid-soaked barley straw gave the highest overall yield of glucose, regardless of impregnation time (10 or 30 min) or acid concentration (0.2 or 1.0 wt%). For xylose, soaking gave the highest overall yield at 0.2 wt% H2SO4. An increase in acid concentration resulted in a decrease in xylose yield for both acid-soaked and acid-sprayed barley straw. Optimization of the pretreatment conditions for acid-sprayed barley straw was performed to obtain yields using spraying that were as high as those with soaking. For acid-sprayed barley straw the optimum pretreatment condition for glucose, 1.0 wt% H2SO4 and 220 degrees C for 5 min, gave an overall glucose yield of 92% of theoretical based on the composition of the raw material. Pretreatment with 0.2 wt% H2SO4 at 190 degrees C for 5 min resulted in the highest overall xylose yield, 67% of theoretical based on the composition of the raw material.}},
author = {{Linde, Marie and Galbe, Mats and Zacchi, Guido}},
issn = {{1559-0291}},
keywords = {{enzymatic hydrolysis; barley straw; pretreatment; ethanol; H2SO4}},
language = {{eng}},
number = {{1-3}},
pages = {{546--562}},
publisher = {{Humana Press}},
series = {{Applied Biochemistry and Biotechnology}},
title = {{Steam pretreatment of acid-sprayed and acid-soaked barley straw for production of ethanol}},
volume = {{130}},
year = {{2006}},
}