Advanced

Separation of lignin in kraft cooking liquor from a continuous digester by ultrafiltration at temperatures above 100 degrees C

Wallberg, Ola LU and Jönsson, Ann-Sofi LU (2006) In Desalination 195(1-3). p.187-200
Abstract
Lignin was extracted by ultrafiltration from kraft cooking liquors taken directly from a continuous digester. The temperature of the liquors was 145 degrees C (softwood) or 135 degrees C (hardwood), the total dry solids content was 18% and the pH 13-14. Methods for start-up, shut-down and cleaning of conventional UF equipment modified for this demanding application, were developed. The influence of transmembrane pressure, cross-flow velocity and temperature on the performance of two ceramic membranes with cut-offs of 5,000 and 15,000 Da was studied. The flux of softwood liquor at 145 degrees C and a TMP of 400 kPa was 100 l/m(2) h for the membrane with the 15,000 Da cutoff and 50 l/m(2) h for the membrane with the 5,000 Da cut-off. The... (More)
Lignin was extracted by ultrafiltration from kraft cooking liquors taken directly from a continuous digester. The temperature of the liquors was 145 degrees C (softwood) or 135 degrees C (hardwood), the total dry solids content was 18% and the pH 13-14. Methods for start-up, shut-down and cleaning of conventional UF equipment modified for this demanding application, were developed. The influence of transmembrane pressure, cross-flow velocity and temperature on the performance of two ceramic membranes with cut-offs of 5,000 and 15,000 Da was studied. The flux of softwood liquor at 145 degrees C and a TMP of 400 kPa was 100 l/m(2) h for the membrane with the 15,000 Da cutoff and 50 l/m(2) h for the membrane with the 5,000 Da cut-off. The retention of lignin was 20% and 30% for the 15,000 Da and 5,000 Da membranes, respectively. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
high, temperature, ceramic membranes, ultrafiltration, Kraft cooking liquor, lignin
in
Desalination
volume
195
issue
1-3
pages
187 - 200
publisher
Elsevier
external identifiers
  • wos:000239850200017
  • scopus:33746278904
ISSN
1873-4464
DOI
10.1016/j.desal.2005.11.011
language
English
LU publication?
yes
id
61d83340-e671-431d-9f3f-bd3f43595bd0 (old id 397510)
date added to LUP
2016-04-01 12:16:41
date last changed
2019-11-26 03:27:40
@article{61d83340-e671-431d-9f3f-bd3f43595bd0,
  abstract     = {Lignin was extracted by ultrafiltration from kraft cooking liquors taken directly from a continuous digester. The temperature of the liquors was 145 degrees C (softwood) or 135 degrees C (hardwood), the total dry solids content was 18% and the pH 13-14. Methods for start-up, shut-down and cleaning of conventional UF equipment modified for this demanding application, were developed. The influence of transmembrane pressure, cross-flow velocity and temperature on the performance of two ceramic membranes with cut-offs of 5,000 and 15,000 Da was studied. The flux of softwood liquor at 145 degrees C and a TMP of 400 kPa was 100 l/m(2) h for the membrane with the 15,000 Da cutoff and 50 l/m(2) h for the membrane with the 5,000 Da cut-off. The retention of lignin was 20% and 30% for the 15,000 Da and 5,000 Da membranes, respectively.},
  author       = {Wallberg, Ola and Jönsson, Ann-Sofi},
  issn         = {1873-4464},
  language     = {eng},
  number       = {1-3},
  pages        = {187--200},
  publisher    = {Elsevier},
  series       = {Desalination},
  title        = {Separation of lignin in kraft cooking liquor from a continuous digester by ultrafiltration at temperatures above 100 degrees C},
  url          = {http://dx.doi.org/10.1016/j.desal.2005.11.011},
  doi          = {10.1016/j.desal.2005.11.011},
  volume       = {195},
  year         = {2006},
}