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Enzymatic treatment of hemicelluloses and lignin isolated from thermomechanical pulp mill process water

Thuvander, Johan LU ; Oinonen, Petri and Jönsson, Ann Sofi LU (2016) In Chemical Engineering Journal 296. p.141-145
Abstract

Hemicelluloses dissolved in thermomechanical pulp (TMP) mill process streams can be used to manufacture high-value-added products. The molecular mass of the dissolved hemicelluloses is about 10 kDa. In some applications, it would be beneficial with larger molecules. It was therefore investigated whether it is possible to increase the size of hemicelluloses isolated by microfiltration and ultrafiltration from TMP process water using enzymatic treatment with laccase. No significant increase of the size of hemicelluloses was achieved, probably due to only a small percentage of lignin carbohydrate complexes in the process water. The molecular mass of lignin increased however markedly from a peak molecular mass of 1 kDa to about 60 kDa.... (More)

Hemicelluloses dissolved in thermomechanical pulp (TMP) mill process streams can be used to manufacture high-value-added products. The molecular mass of the dissolved hemicelluloses is about 10 kDa. In some applications, it would be beneficial with larger molecules. It was therefore investigated whether it is possible to increase the size of hemicelluloses isolated by microfiltration and ultrafiltration from TMP process water using enzymatic treatment with laccase. No significant increase of the size of hemicelluloses was achieved, probably due to only a small percentage of lignin carbohydrate complexes in the process water. The molecular mass of lignin increased however markedly from a peak molecular mass of 1 kDa to about 60 kDa. Diafiltration was used to purify large molecules after the enzymatic treatment. Low-molecular-mass sugar and lignin molecules in the diafiltration permeate were concentrated by nanofiltration. The retention of sugars and lignin was about 98% during nanofiltration to a volume reduction of 80%. Average flux during nanofiltration was 49 l/m2 h.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Enzymatic treatment, Galactoglucomannan, Nanofiltration, Thermomechanical pulp, Ultrafiltration
in
Chemical Engineering Journal
volume
296
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:84962283435
  • wos:000375816400015
ISSN
1385-8947
DOI
10.1016/j.cej.2016.03.087
language
English
LU publication?
yes
id
99a3a8a8-fcb6-4759-b9c0-78f92055bef1
date added to LUP
2016-04-26 13:02:56
date last changed
2017-01-01 08:23:45
@article{99a3a8a8-fcb6-4759-b9c0-78f92055bef1,
  abstract     = {<p>Hemicelluloses dissolved in thermomechanical pulp (TMP) mill process streams can be used to manufacture high-value-added products. The molecular mass of the dissolved hemicelluloses is about 10 kDa. In some applications, it would be beneficial with larger molecules. It was therefore investigated whether it is possible to increase the size of hemicelluloses isolated by microfiltration and ultrafiltration from TMP process water using enzymatic treatment with laccase. No significant increase of the size of hemicelluloses was achieved, probably due to only a small percentage of lignin carbohydrate complexes in the process water. The molecular mass of lignin increased however markedly from a peak molecular mass of 1 kDa to about 60 kDa. Diafiltration was used to purify large molecules after the enzymatic treatment. Low-molecular-mass sugar and lignin molecules in the diafiltration permeate were concentrated by nanofiltration. The retention of sugars and lignin was about 98% during nanofiltration to a volume reduction of 80%. Average flux during nanofiltration was 49 l/m<sup>2</sup> h.</p>},
  author       = {Thuvander, Johan and Oinonen, Petri and Jönsson, Ann Sofi},
  issn         = {1385-8947},
  keyword      = {Enzymatic treatment,Galactoglucomannan,Nanofiltration,Thermomechanical pulp,Ultrafiltration},
  language     = {eng},
  month        = {07},
  pages        = {141--145},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Journal},
  title        = {Enzymatic treatment of hemicelluloses and lignin isolated from thermomechanical pulp mill process water},
  url          = {http://dx.doi.org/10.1016/j.cej.2016.03.087},
  volume       = {296},
  year         = {2016},
}