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Scale-up of high-solid enzymatic hydrolysis of steam-pretreated softwood : the effects of reactor flow conditions

Palmqvist, Benny LU ; Kadic, Adnan LU ; Hägglund, Karin; Petersson, Anneli LU and Lidén, Gunnar LU (2016) In Biomass Conversion and Biorefinery 6(2). p.173-180
Abstract

The importance of flow conditions during scale-up of high-solid enzymatic hydrolysis of steam-pretreated spruce was demonstrated by comparing hydrolysis rates between laboratory (2 L) and demonstration (4 m3) scale. A positive effect of increased agitation speed on the rate of enzymatic hydrolysis was found regardless of scale. Importantly, the hydrolysis rate was higher at the larger scale when compared at similar specific power inputs. Changes in the rheological properties of the pretreated material during the hydrolysis were followed by off-line measurements of apparent viscosity. This information was used to estimate the flow conditions in the reactors, i.e., average Reynolds numbers, which together with measured mixing... (More)

The importance of flow conditions during scale-up of high-solid enzymatic hydrolysis of steam-pretreated spruce was demonstrated by comparing hydrolysis rates between laboratory (2 L) and demonstration (4 m3) scale. A positive effect of increased agitation speed on the rate of enzymatic hydrolysis was found regardless of scale. Importantly, the hydrolysis rate was higher at the larger scale when compared at similar specific power inputs. Changes in the rheological properties of the pretreated material during the hydrolysis were followed by off-line measurements of apparent viscosity. This information was used to estimate the flow conditions in the reactors, i.e., average Reynolds numbers, which together with measured mixing power consumptions enabled a more detailed comparison between the scales. The hydrolysis yields correlated better with average Reynolds numbers than specific power input over the different scales. This indicates that mass transport limitations, caused by insufficient bulk flow, likely play a decisive role in determining the rate of enzymatic hydrolysis.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Enzymatic hydrolysis, Mixing, Power input, Rheology, Scale-up, Spruce
in
Biomass Conversion and Biorefinery
volume
6
issue
2
pages
8 pages
publisher
Springer
external identifiers
  • scopus:84978024424
  • wos:000377398800005
ISSN
2190-6815
DOI
10.1007/s13399-015-0177-3
language
English
LU publication?
yes
id
feaa7b9b-3d42-4a55-a878-87fba9dea58d
date added to LUP
2017-01-25 14:02:34
date last changed
2017-09-18 11:33:58
@article{feaa7b9b-3d42-4a55-a878-87fba9dea58d,
  abstract     = {<p>The importance of flow conditions during scale-up of high-solid enzymatic hydrolysis of steam-pretreated spruce was demonstrated by comparing hydrolysis rates between laboratory (2 L) and demonstration (4 m<sup>3</sup>) scale. A positive effect of increased agitation speed on the rate of enzymatic hydrolysis was found regardless of scale. Importantly, the hydrolysis rate was higher at the larger scale when compared at similar specific power inputs. Changes in the rheological properties of the pretreated material during the hydrolysis were followed by off-line measurements of apparent viscosity. This information was used to estimate the flow conditions in the reactors, i.e., average Reynolds numbers, which together with measured mixing power consumptions enabled a more detailed comparison between the scales. The hydrolysis yields correlated better with average Reynolds numbers than specific power input over the different scales. This indicates that mass transport limitations, caused by insufficient bulk flow, likely play a decisive role in determining the rate of enzymatic hydrolysis.</p>},
  author       = {Palmqvist, Benny and Kadic, Adnan and Hägglund, Karin and Petersson, Anneli and Lidén, Gunnar},
  issn         = {2190-6815},
  keyword      = {Enzymatic hydrolysis,Mixing,Power input,Rheology,Scale-up,Spruce},
  language     = {eng},
  month        = {06},
  number       = {2},
  pages        = {173--180},
  publisher    = {Springer},
  series       = {Biomass Conversion and Biorefinery},
  title        = {Scale-up of high-solid enzymatic hydrolysis of steam-pretreated softwood : the effects of reactor flow conditions},
  url          = {http://dx.doi.org/10.1007/s13399-015-0177-3},
  volume       = {6},
  year         = {2016},
}