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Concentration and purification of lignin in hardwood kraft pulping liquor by ultrafiltration and nanofiltration

Jönsson, Ann-Sofi LU ; Nordin, Anna-Karin LU and Wallberg, Ola LU (2008) In Chemical Engineering Research & Design 86(11A). p.1271-1280
Abstract
Today, there is considerable interest in integrated forest biorefineries which, besides pulp, produce high-value-added products, such as, polymers and carbon fibres. Lignin is the major non-cellulosic constituent of wood. It is a complex, amorphous highly crosslinked polyphenolic. Lignosulphonate in spent liquor in sulphite mills has long been isolated using ultra filtration. Generally, precipitation is used to extract the lignin from kraft black liquor. The liquor is commonly withdrawn from the evaporation unit in the recovery system, where the dry substance is optimal for precipitation. Lately, interest in the isolation of lignin by ultrafiltration of kraft black liquor has arisen. The concentration of the liquor is not that critical,... (More)
Today, there is considerable interest in integrated forest biorefineries which, besides pulp, produce high-value-added products, such as, polymers and carbon fibres. Lignin is the major non-cellulosic constituent of wood. It is a complex, amorphous highly crosslinked polyphenolic. Lignosulphonate in spent liquor in sulphite mills has long been isolated using ultra filtration. Generally, precipitation is used to extract the lignin from kraft black liquor. The liquor is commonly withdrawn from the evaporation unit in the recovery system, where the dry substance is optimal for precipitation. Lately, interest in the isolation of lignin by ultrafiltration of kraft black liquor has arisen. The concentration of the liquor is not that critical, and there is therefore considerable freedom in the choice of liquor for treatment with ultra filtration. In this work, the influence of membrane cut-off, transmembrane pressure and cross-flow velocity during ultrafiltration of cooking liquor and black liquor was studied. The extraction of lignin from hardwood black liquor withdrawn before the evaporation unit was investigated. A hybrid ultrafiltration/nanofiltration process was used. The lignin concentration was 60 g/l in the black liquor and 165 g/l in the product stream (the narrofiltration retentate). A cost estimate indicates a production cost of (sic)33 per tonne of lignin. (C) 2008 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nanofiltration, Ultrafiltration, Kraft black liquor, Cost estimate, Lignin
in
Chemical Engineering Research & Design
volume
86
issue
11A
pages
1271 - 1280
publisher
IChemE
external identifiers
  • wos:000260693700010
  • scopus:53249094109
ISSN
0263-8762
DOI
10.1016/j.cherd.2008.06.003
language
English
LU publication?
yes
id
1117286f-5629-4dd3-b1d4-7f445271528e (old id 1283525)
date added to LUP
2009-02-10 11:07:26
date last changed
2017-11-05 04:18:33
@article{1117286f-5629-4dd3-b1d4-7f445271528e,
  abstract     = {Today, there is considerable interest in integrated forest biorefineries which, besides pulp, produce high-value-added products, such as, polymers and carbon fibres. Lignin is the major non-cellulosic constituent of wood. It is a complex, amorphous highly crosslinked polyphenolic. Lignosulphonate in spent liquor in sulphite mills has long been isolated using ultra filtration. Generally, precipitation is used to extract the lignin from kraft black liquor. The liquor is commonly withdrawn from the evaporation unit in the recovery system, where the dry substance is optimal for precipitation. Lately, interest in the isolation of lignin by ultrafiltration of kraft black liquor has arisen. The concentration of the liquor is not that critical, and there is therefore considerable freedom in the choice of liquor for treatment with ultra filtration. In this work, the influence of membrane cut-off, transmembrane pressure and cross-flow velocity during ultrafiltration of cooking liquor and black liquor was studied. The extraction of lignin from hardwood black liquor withdrawn before the evaporation unit was investigated. A hybrid ultrafiltration/nanofiltration process was used. The lignin concentration was 60 g/l in the black liquor and 165 g/l in the product stream (the narrofiltration retentate). A cost estimate indicates a production cost of (sic)33 per tonne of lignin. (C) 2008 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.},
  author       = {Jönsson, Ann-Sofi and Nordin, Anna-Karin and Wallberg, Ola},
  issn         = {0263-8762},
  keyword      = {Nanofiltration,Ultrafiltration,Kraft black liquor,Cost estimate,Lignin},
  language     = {eng},
  number       = {11A},
  pages        = {1271--1280},
  publisher    = {IChemE},
  series       = {Chemical Engineering Research & Design},
  title        = {Concentration and purification of lignin in hardwood kraft pulping liquor by ultrafiltration and nanofiltration},
  url          = {http://dx.doi.org/10.1016/j.cherd.2008.06.003},
  volume       = {86},
  year         = {2008},
}