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The influence of hemicelluloses during the precipitation of lignin in kraft black liquor

Wallmo, Henrik; Theliander, Hans; Jönsson, Ann-Sofi LU ; Wallberg, Ola LU and Lindgren, K. (2009) In Nordic Pulp & Paper Research Journal 24(2). p.165-171
Abstract
Removing lignin from black liquor is one way of recovering valuable organic substances for alternative use as well as reducing the energy surplus in a modern, energy-optimised kraft pulp mill. By using the recently developed "LignoBoost" process it is possible to upgrade black liquor streams of different origin to form valuable chemicals. In this investigation a combination of membrane filtration and the LignoBoost concept was used. The primary objective of the work was to investigate whether or not the filtration properties of the black liquor were affected by its hemicellulose content. The hemicellulose content in the black liquors was lowered prior to precipitation using three different pre-treatment techniques, and the filtration... (More)
Removing lignin from black liquor is one way of recovering valuable organic substances for alternative use as well as reducing the energy surplus in a modern, energy-optimised kraft pulp mill. By using the recently developed "LignoBoost" process it is possible to upgrade black liquor streams of different origin to form valuable chemicals. In this investigation a combination of membrane filtration and the LignoBoost concept was used. The primary objective of the work was to investigate whether or not the filtration properties of the black liquor were affected by its hemicellulose content. The hemicellulose content in the black liquors was lowered prior to precipitation using three different pre-treatment techniques, and the filtration properties were compared to the reference black liquors of evaporated softwood and hardwood black liquor. The pre-treatment methods used were heat-treatment, ultrafiltration and a combination of ultrafiltration and nanofiltration. It was shown that the filtration resistance was lowered considerably when the hemicellulose content in the black liquor was reduced prior to precipitation. The experiments also showed that it was possible to produce a hardwood lignin product of high purity i.e. low sodium (0.2 w-% of TIDS) and hemicellulose content (0.7 w-% of TDS) (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ultrafiltration, Hemicellulose, Filtration, Lignin, LignoBoost
in
Nordic Pulp & Paper Research Journal
volume
24
issue
2
pages
165 - 171
publisher
Arbor Publishing AB
external identifiers
  • wos:000268735100007
  • scopus:68049120351
ISSN
0283-2631
language
English
LU publication?
yes
id
16cb7f0b-4d70-4867-a300-c3cf8dcdd093 (old id 1478138)
date added to LUP
2009-09-23 10:08:29
date last changed
2017-10-22 04:12:54
@article{16cb7f0b-4d70-4867-a300-c3cf8dcdd093,
  abstract     = {Removing lignin from black liquor is one way of recovering valuable organic substances for alternative use as well as reducing the energy surplus in a modern, energy-optimised kraft pulp mill. By using the recently developed "LignoBoost" process it is possible to upgrade black liquor streams of different origin to form valuable chemicals. In this investigation a combination of membrane filtration and the LignoBoost concept was used. The primary objective of the work was to investigate whether or not the filtration properties of the black liquor were affected by its hemicellulose content. The hemicellulose content in the black liquors was lowered prior to precipitation using three different pre-treatment techniques, and the filtration properties were compared to the reference black liquors of evaporated softwood and hardwood black liquor. The pre-treatment methods used were heat-treatment, ultrafiltration and a combination of ultrafiltration and nanofiltration. It was shown that the filtration resistance was lowered considerably when the hemicellulose content in the black liquor was reduced prior to precipitation. The experiments also showed that it was possible to produce a hardwood lignin product of high purity i.e. low sodium (0.2 w-% of TIDS) and hemicellulose content (0.7 w-% of TDS)},
  author       = {Wallmo, Henrik and Theliander, Hans and Jönsson, Ann-Sofi and Wallberg, Ola and Lindgren, K.},
  issn         = {0283-2631},
  keyword      = {Ultrafiltration,Hemicellulose,Filtration,Lignin,LignoBoost},
  language     = {eng},
  number       = {2},
  pages        = {165--171},
  publisher    = {Arbor Publishing AB},
  series       = {Nordic Pulp & Paper Research Journal},
  title        = {The influence of hemicelluloses during the precipitation of lignin in kraft black liquor},
  volume       = {24},
  year         = {2009},
}