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Membrane performance during ultrafiltration of a high-viscosity solution containing hemicelluloses from wheat bran

Krawczyk, Holger LU ; Arkell, Anders LU and Jönsson, Ann-Sofi LU (2011) In Separation and Purification Technology 83. p.144-150
Abstract
Hemicelluloses isolated from agricultural residues have the potential to replace fossil-based materials in high-value-added applications, provided that cost-efficient isolation processes are developed. In this study, a feed solution containing hemicelluloses extracted from wheat bran with a particular high viscosity was used to study the performance of ultrafiltration for hemicellulose isolation at various operating conditions. The operating parameters affected the flux significantly, but had no influence on the retention of the membrane. The flux was doubled by: (i) increasing the cross-flow velocity from 2 to 5 m/s, (ii) increasing the feed temperature from 60 to 80 degrees C and (iii) decreasing the concentration of the solution by... (More)
Hemicelluloses isolated from agricultural residues have the potential to replace fossil-based materials in high-value-added applications, provided that cost-efficient isolation processes are developed. In this study, a feed solution containing hemicelluloses extracted from wheat bran with a particular high viscosity was used to study the performance of ultrafiltration for hemicellulose isolation at various operating conditions. The operating parameters affected the flux significantly, but had no influence on the retention of the membrane. The flux was doubled by: (i) increasing the cross-flow velocity from 2 to 5 m/s, (ii) increasing the feed temperature from 60 to 80 degrees C and (iii) decreasing the concentration of the solution by half. The flux increase could mainly be attributed to a decrease in the apparent viscosity of the feed solution. This indicates that low feed viscosity is the key to good membrane performance. The limiting flux during ultrafiltration was reached at the low transmembrane pressure of 0.8 bar, even when the cross-flow velocity and feed temperature were as high as 5 m/s and 80 degrees C, respectively. Low transmembrane pressure is thus preferable during ultrafiltration of solutions similar to that used in the present investigation. The results of this study suggest that ultrafiltration could be a suitable method for the isolation of hemicelluloses from high-viscosity solutions. However, as the operating parameters affect the membrane performance significantly, they must be chosen with care to make the process cost-efficient. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ultrafiltration, Ceramic membrane, High viscosity, Hemicelluloses, Wheat bran
in
Separation and Purification Technology
volume
83
pages
144 - 150
publisher
Elsevier
external identifiers
  • wos:000297444900020
  • scopus:80055076385
ISSN
1873-3794
DOI
10.1016/j.seppur.2011.09.028
language
English
LU publication?
yes
id
9155064c-0468-4e50-9dac-9e830fad1b65 (old id 2279358)
date added to LUP
2012-01-11 15:37:55
date last changed
2017-07-23 03:30:11
@article{9155064c-0468-4e50-9dac-9e830fad1b65,
  abstract     = {Hemicelluloses isolated from agricultural residues have the potential to replace fossil-based materials in high-value-added applications, provided that cost-efficient isolation processes are developed. In this study, a feed solution containing hemicelluloses extracted from wheat bran with a particular high viscosity was used to study the performance of ultrafiltration for hemicellulose isolation at various operating conditions. The operating parameters affected the flux significantly, but had no influence on the retention of the membrane. The flux was doubled by: (i) increasing the cross-flow velocity from 2 to 5 m/s, (ii) increasing the feed temperature from 60 to 80 degrees C and (iii) decreasing the concentration of the solution by half. The flux increase could mainly be attributed to a decrease in the apparent viscosity of the feed solution. This indicates that low feed viscosity is the key to good membrane performance. The limiting flux during ultrafiltration was reached at the low transmembrane pressure of 0.8 bar, even when the cross-flow velocity and feed temperature were as high as 5 m/s and 80 degrees C, respectively. Low transmembrane pressure is thus preferable during ultrafiltration of solutions similar to that used in the present investigation. The results of this study suggest that ultrafiltration could be a suitable method for the isolation of hemicelluloses from high-viscosity solutions. However, as the operating parameters affect the membrane performance significantly, they must be chosen with care to make the process cost-efficient. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Krawczyk, Holger and Arkell, Anders and Jönsson, Ann-Sofi},
  issn         = {1873-3794},
  keyword      = {Ultrafiltration,Ceramic membrane,High viscosity,Hemicelluloses,Wheat bran},
  language     = {eng},
  pages        = {144--150},
  publisher    = {Elsevier},
  series       = {Separation and Purification Technology},
  title        = {Membrane performance during ultrafiltration of a high-viscosity solution containing hemicelluloses from wheat bran},
  url          = {http://dx.doi.org/10.1016/j.seppur.2011.09.028},
  volume       = {83},
  year         = {2011},
}