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Ultrafiltration of kraft black liquor from two Swedish pulp mills

Holmqvist, Anders LU ; Wallberg, Ola LU and Jönsson, Ann-Sofi LU (2005) In Chemical Engineering Research & Design 83(A8). p.994-999
Abstract
Extraction of lignin by ultrafiltration of black liquor from two Swedish pulp mills has been studied. One of the mills employs batch digestion and the other continuous digestion. At both mills softwood was used as raw material. The black liquor was withdrawn before the evaporator unit. A ceramic membrane with a cut-off of 15 000 g mol(-1) was used in the experiments. The average flux during concentration to 90% volume reduction was 160 and 110L m(-2) h(-1) for the liquors from the batch and the continuous digestion processes, respectively, when the temperature was 90 degrees C and the transmembrane pressure 200 kPa. The retention of lignin was about the same for both liquors, 35%. A cost estimate of extraction of lignin fuel from black... (More)
Extraction of lignin by ultrafiltration of black liquor from two Swedish pulp mills has been studied. One of the mills employs batch digestion and the other continuous digestion. At both mills softwood was used as raw material. The black liquor was withdrawn before the evaporator unit. A ceramic membrane with a cut-off of 15 000 g mol(-1) was used in the experiments. The average flux during concentration to 90% volume reduction was 160 and 110L m(-2) h(-1) for the liquors from the batch and the continuous digestion processes, respectively, when the temperature was 90 degrees C and the transmembrane pressure 200 kPa. The retention of lignin was about the same for both liquors, 35%. A cost estimate of extraction of lignin fuel from black liquor was made, based on experimental data from ultrafiltration at various operating conditions. The cost was found to be about 20 E per MWh of calorific value of the lignin fuel. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemical Engineering Research & Design
volume
83
issue
A8
pages
994 - 999
publisher
IChemE
external identifiers
  • wos:000231744300006
  • scopus:23944441532
ISSN
0263-8762
DOI
10.1205/cherd.04204
language
English
LU publication?
yes
id
9d855162-1095-4aec-91c0-303706b6177c (old id 151638)
date added to LUP
2007-06-25 11:17:59
date last changed
2017-10-01 04:44:47
@article{9d855162-1095-4aec-91c0-303706b6177c,
  abstract     = {Extraction of lignin by ultrafiltration of black liquor from two Swedish pulp mills has been studied. One of the mills employs batch digestion and the other continuous digestion. At both mills softwood was used as raw material. The black liquor was withdrawn before the evaporator unit. A ceramic membrane with a cut-off of 15 000 g mol(-1) was used in the experiments. The average flux during concentration to 90% volume reduction was 160 and 110L m(-2) h(-1) for the liquors from the batch and the continuous digestion processes, respectively, when the temperature was 90 degrees C and the transmembrane pressure 200 kPa. The retention of lignin was about the same for both liquors, 35%. A cost estimate of extraction of lignin fuel from black liquor was made, based on experimental data from ultrafiltration at various operating conditions. The cost was found to be about 20 E per MWh of calorific value of the lignin fuel.},
  author       = {Holmqvist, Anders and Wallberg, Ola and Jönsson, Ann-Sofi},
  issn         = {0263-8762},
  language     = {eng},
  number       = {A8},
  pages        = {994--999},
  publisher    = {IChemE},
  series       = {Chemical Engineering Research & Design},
  title        = {Ultrafiltration of kraft black liquor from two Swedish pulp mills},
  url          = {http://dx.doi.org/10.1205/cherd.04204},
  volume       = {83},
  year         = {2005},
}