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Rheological characterization of dilute acid pretreated softwood.

Wiman, Magnus LU ; Palmqvist, Benny LU ; Tornberg, Eva LU and Lidén, Gunnar LU (2011) In Biotechnology and Bioengineering 108(5). p.1031-1041
Abstract
Large-scale bioethanol production from lignocellulosic biomass will require high solids loading in the enzymatic hydrolysis step. However, slurries of pretreated lignocelluloses are complex fluids due to the fibrous nature, especially at high concentrations of water insoluble solids (WIS). A prerequisite for dealing with transport issues and for developing efficient full-scale processes is a fundamental understanding of the flow properties of pretreated lignocellulose. A comprehensive rheological characterization of dilute acid pretreated spruce has been carried out in this study, accounting for the effects of WIS concentration, particle size distribution (PSD), and the degree of enzymatic hydrolysis. The rheology of pretreated spruce... (More)
Large-scale bioethanol production from lignocellulosic biomass will require high solids loading in the enzymatic hydrolysis step. However, slurries of pretreated lignocelluloses are complex fluids due to the fibrous nature, especially at high concentrations of water insoluble solids (WIS). A prerequisite for dealing with transport issues and for developing efficient full-scale processes is a fundamental understanding of the flow properties of pretreated lignocellulose. A comprehensive rheological characterization of dilute acid pretreated spruce has been carried out in this study, accounting for the effects of WIS concentration, particle size distribution (PSD), and the degree of enzymatic hydrolysis. The rheology of pretreated spruce slurries was found to be strongly dependent on the WIS concentration. The storage modulus (G'(LVR)) and yield stress showed typical power-law dependencies on volume fraction and WIS content. Milling of the pretreated material resulted in significantly higher yield stress and viscosity, likely due to narrower PSD, which suggests that the strength of the network of the coarsest fibers determines the rheology of these materials to a large extent. During enzymatic hydrolysis, yield stress and viscosity decreased dramatically, partly due to decreasing WIS content, but possibly also due to changes in fiber properties such as the chemical composition. Biotechnol. Bioeng. © 2010 Wiley Periodicals, Inc. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Biotechnology and Bioengineering
volume
108
issue
5
pages
1031 - 1041
publisher
John Wiley & Sons
external identifiers
  • pmid:21449021
  • wos:000288394300005
  • scopus:79953158843
ISSN
1097-0290
DOI
10.1002/bit.23020
language
English
LU publication?
yes
id
e34c4b16-f73f-41a8-9d93-4eada61170cd (old id 1756808)
date added to LUP
2010-12-30 11:08:16
date last changed
2017-08-13 03:11:46
@article{e34c4b16-f73f-41a8-9d93-4eada61170cd,
  abstract     = {Large-scale bioethanol production from lignocellulosic biomass will require high solids loading in the enzymatic hydrolysis step. However, slurries of pretreated lignocelluloses are complex fluids due to the fibrous nature, especially at high concentrations of water insoluble solids (WIS). A prerequisite for dealing with transport issues and for developing efficient full-scale processes is a fundamental understanding of the flow properties of pretreated lignocellulose. A comprehensive rheological characterization of dilute acid pretreated spruce has been carried out in this study, accounting for the effects of WIS concentration, particle size distribution (PSD), and the degree of enzymatic hydrolysis. The rheology of pretreated spruce slurries was found to be strongly dependent on the WIS concentration. The storage modulus (G'(LVR)) and yield stress showed typical power-law dependencies on volume fraction and WIS content. Milling of the pretreated material resulted in significantly higher yield stress and viscosity, likely due to narrower PSD, which suggests that the strength of the network of the coarsest fibers determines the rheology of these materials to a large extent. During enzymatic hydrolysis, yield stress and viscosity decreased dramatically, partly due to decreasing WIS content, but possibly also due to changes in fiber properties such as the chemical composition. Biotechnol. Bioeng. © 2010 Wiley Periodicals, Inc.},
  author       = {Wiman, Magnus and Palmqvist, Benny and Tornberg, Eva and Lidén, Gunnar},
  issn         = {1097-0290},
  language     = {eng},
  number       = {5},
  pages        = {1031--1041},
  publisher    = {John Wiley & Sons},
  series       = {Biotechnology and Bioengineering},
  title        = {Rheological characterization of dilute acid pretreated softwood.},
  url          = {http://dx.doi.org/10.1002/bit.23020},
  volume       = {108},
  year         = {2011},
}