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Hemicellulose Recovery from Spent-Sulfite-Liquor: Lignin Removal by Adsorption to Resins for Improvement of the Ultrafiltration Process

Al-Rudainy, Basel LU ; Galbe, Mats LU and Wallberg, Ola LU (2020) In Molecules 25(15).
Abstract
In this work, three polymeric resins were examined as alternatives for the separation of hemicellulose and lignin. The aim was to remove the lignin from spent-sulfite-liquor (SSL) prior to ultrafiltration, producing a hemicellulose-rich retentate with high purity, and increase the capacity of the membrane filtration. The lignin in the SSL was sulfonated; thus, two of the resins were anion exchangers and 1 was hydrophobic. The data from the equilibrium studies and adsorption kinetics were fitted to established models, and the results were interpreted based on these observations. The strongly basic anion exchanger performed best with regard to lignin removal. The adsorption followed the Sips isotherm, indicating that the process was... (More)
In this work, three polymeric resins were examined as alternatives for the separation of hemicellulose and lignin. The aim was to remove the lignin from spent-sulfite-liquor (SSL) prior to ultrafiltration, producing a hemicellulose-rich retentate with high purity, and increase the capacity of the membrane filtration. The lignin in the SSL was sulfonated; thus, two of the resins were anion exchangers and 1 was hydrophobic. The data from the equilibrium studies and adsorption kinetics were fitted to established models, and the results were interpreted based on these observations. The strongly basic anion exchanger performed best with regard to lignin removal. The adsorption followed the Sips isotherm, indicating that the process was cooperative with chemisorption as the main reaction between the adsorbate and adsorbent based on the kinetics. Regeneration of the adsorbent was also possible, wherein 100 g/L NaCl was sufficient to recover 98% of the lignin. The lignin removal had a positive effect on the ultrafiltration process, in which the flux increased by 38% and the extent of separation between the hemicellulose and lignin rose from 17% to 59%. (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Molecules
volume
25
issue
15
article number
3435
publisher
Molecular Diversity Preservation International
external identifiers
  • scopus:85088907639
  • pmid:32731635
ISSN
1420-3049
DOI
10.3390/molecules25153435
project
Isolation of hemicelluloses from spent-sulfite-liquor
language
English
LU publication?
yes
id
04094e00-753a-4c6b-9431-2775245689a4
date added to LUP
2020-07-28 18:12:10
date last changed
2020-10-28 03:00:25
@article{04094e00-753a-4c6b-9431-2775245689a4,
  abstract     = {In this work, three polymeric resins were examined as alternatives for the separation of hemicellulose and lignin. The aim was to remove the lignin from spent-sulfite-liquor (SSL) prior to ultrafiltration, producing a hemicellulose-rich retentate with high purity, and increase the capacity of the membrane filtration. The lignin in the SSL was sulfonated; thus, two of the resins were anion exchangers and 1 was hydrophobic. The data from the equilibrium studies and adsorption kinetics were fitted to established models, and the results were interpreted based on these observations. The strongly basic anion exchanger performed best with regard to lignin removal. The adsorption followed the Sips isotherm, indicating that the process was cooperative with chemisorption as the main reaction between the adsorbate and adsorbent based on the kinetics. Regeneration of the adsorbent was also possible, wherein 100 g/L NaCl was sufficient to recover 98% of the lignin. The lignin removal had a positive effect on the ultrafiltration process, in which the flux increased by 38% and the extent of separation between the hemicellulose and lignin rose from 17% to 59%.},
  author       = {Al-Rudainy, Basel and Galbe, Mats and Wallberg, Ola},
  issn         = {1420-3049},
  language     = {eng},
  month        = {07},
  number       = {15},
  publisher    = {Molecular Diversity Preservation International},
  series       = {Molecules},
  title        = {Hemicellulose Recovery from Spent-Sulfite-Liquor: Lignin Removal by Adsorption to Resins for Improvement of the Ultrafiltration Process},
  url          = {http://dx.doi.org/10.3390/molecules25153435},
  doi          = {10.3390/molecules25153435},
  volume       = {25},
  year         = {2020},
}