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Improved one-step steam pretreatment of SO2-impregnated softwood with time-dependent temperature profile for ethanol production.

Monavari, Sanam LU ; Bennato, Andrea; Galbe, Mats LU and Zacchi, Guido LU (2010) In Biotechnology Progress 26(4). p.1054-1060
Abstract
In the production of ethanol from lignocellulosic material, pretreatment of the raw material before enzymatic hydrolysis and fermentation is essential to obtain high overall yields of sugar and ethanol. Two-step steam pretreatment results in higher ethanol yields from softwood than the standard one-step pretreatment process. However, the difficulty with separation and washing of the material at high pressure between the two pretreatment steps is a major drawback. In this study, a new one-step pretreatment procedure was investigated, in which the time-temperature profile was varied during pretreatment. The efficiency of pretreatment was assessed by performing simultaneous saccharification and fermentation on the pretreated slurries.... (More)
In the production of ethanol from lignocellulosic material, pretreatment of the raw material before enzymatic hydrolysis and fermentation is essential to obtain high overall yields of sugar and ethanol. Two-step steam pretreatment results in higher ethanol yields from softwood than the standard one-step pretreatment process. However, the difficulty with separation and washing of the material at high pressure between the two pretreatment steps is a major drawback. In this study, a new one-step pretreatment procedure was investigated, in which the time-temperature profile was varied during pretreatment. The efficiency of pretreatment was assessed by performing simultaneous saccharification and fermentation on the pretreated slurries. Pretreatment of SO(2)-impregnated softwood performed by varying the temperature (190-226 degrees C), the residence time (5-10 min), and the mode of temperature increase (linear or stepwise), resulted in recovery of about 90% of the mannose and glucose present in the raw material. The highest ethanol yield, 75% of theoretical based on the glucan and mannan content of the raw material, was obtained at pretreatment conditions of 190 degrees C for 12 min. Similar ethanol yields were achieved when running the pretreatment as one-step (190-200 degrees C), two levels of temperature, at shorter residence time (7 min), which results in lower capital costs for the process. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biotechnology Progress
volume
26
issue
4
pages
1054 - 1060
publisher
The American Chemical Society
external identifiers
  • wos:000281045100017
  • pmid:20730762
  • scopus:77956971713
ISSN
1520-6033
DOI
10.1002/btpr.421
language
English
LU publication?
yes
id
eb90cbf8-69fb-4b9c-b93d-e1bf53da9415 (old id 1665087)
date added to LUP
2010-09-08 15:36:50
date last changed
2018-11-21 19:47:21
@article{eb90cbf8-69fb-4b9c-b93d-e1bf53da9415,
  abstract     = {In the production of ethanol from lignocellulosic material, pretreatment of the raw material before enzymatic hydrolysis and fermentation is essential to obtain high overall yields of sugar and ethanol. Two-step steam pretreatment results in higher ethanol yields from softwood than the standard one-step pretreatment process. However, the difficulty with separation and washing of the material at high pressure between the two pretreatment steps is a major drawback. In this study, a new one-step pretreatment procedure was investigated, in which the time-temperature profile was varied during pretreatment. The efficiency of pretreatment was assessed by performing simultaneous saccharification and fermentation on the pretreated slurries. Pretreatment of SO(2)-impregnated softwood performed by varying the temperature (190-226 degrees C), the residence time (5-10 min), and the mode of temperature increase (linear or stepwise), resulted in recovery of about 90% of the mannose and glucose present in the raw material. The highest ethanol yield, 75% of theoretical based on the glucan and mannan content of the raw material, was obtained at pretreatment conditions of 190 degrees C for 12 min. Similar ethanol yields were achieved when running the pretreatment as one-step (190-200 degrees C), two levels of temperature, at shorter residence time (7 min), which results in lower capital costs for the process.},
  author       = {Monavari, Sanam and Bennato, Andrea and Galbe, Mats and Zacchi, Guido},
  issn         = {1520-6033},
  language     = {eng},
  number       = {4},
  pages        = {1054--1060},
  publisher    = {The American Chemical Society},
  series       = {Biotechnology Progress},
  title        = {Improved one-step steam pretreatment of SO2-impregnated softwood with time-dependent temperature profile for ethanol production.},
  url          = {http://dx.doi.org/10.1002/btpr.421},
  volume       = {26},
  year         = {2010},
}