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Influence of heat pretreatment on ultrafiltration of a solution containing hemicelluloses extracted from wheat bran

Arkell, Anders LU ; Krawczyk, Holger LU and Jönsson, Ann-Sofi LU (2013) In Separation and Purification Technology 119. p.46-50
Abstract
Hemicelluloses extracted from wheat bran can be concentrated and purified by ultrafiltration. However,

the viscosity of the process solution is rather high (about 5 mPa s at 80 C and a shear rate of 100 s1),

which results in a relatively low flux. The solution was subjected to heat pretreatment in an attempt

to decrease the viscosity and increase the flux. Pretreatment of the solution at 80 C for 72 h was found

to reduce the viscosity by 25%. The flux during ultrafiltration with a 10 kDa ceramic membrane increased

from 48 l/m2 h, for the untreated solution, to 62 l/m2 h. The increase in flux was lower than expected, and

this was attributed to the formation of a fouling layer of... (More)
Hemicelluloses extracted from wheat bran can be concentrated and purified by ultrafiltration. However,

the viscosity of the process solution is rather high (about 5 mPa s at 80 C and a shear rate of 100 s1),

which results in a relatively low flux. The solution was subjected to heat pretreatment in an attempt

to decrease the viscosity and increase the flux. Pretreatment of the solution at 80 C for 72 h was found

to reduce the viscosity by 25%. The flux during ultrafiltration with a 10 kDa ceramic membrane increased

from 48 l/m2 h, for the untreated solution, to 62 l/m2 h. The increase in flux was lower than expected, and

this was attributed to the formation of a fouling layer of acid-insoluble compounds on the membrane.

Both hemicelluloses and lignin were partly degraded. The retention of lignin was reduced from about

30% to 18%, whereas the retention of hemicelluloses was above 95%, and was not affected by heat pretreatment.

The decrease in lignin retention after heat pretreatment results in improved separation of

hemicelluloses and lignin, facilitating the purification of hemicelluloses. (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
Ultrafiltration, Ceramic membrane, Hemicelluloses, Wheat bran, Heat pretreatment
in
Separation and Purification Technology
volume
119
pages
46 - 50
publisher
Elsevier
external identifiers
  • wos:000332500100007
  • scopus:84884885078
ISSN
1873-3794
DOI
10.1016/j.seppur.2013.09.001
language
English
LU publication?
yes
id
85bfe32a-9106-4e9d-abcf-365b801853a2 (old id 4092224)
alternative location
http://www.sciencedirect.com/science/article/pii/S1383586613005285#
date added to LUP
2013-11-04 11:36:42
date last changed
2019-10-16 01:16:11
@article{85bfe32a-9106-4e9d-abcf-365b801853a2,
  abstract     = {Hemicelluloses extracted from wheat bran can be concentrated and purified by ultrafiltration. However,<br/><br>
the viscosity of the process solution is rather high (about 5 mPa s at 80 C and a shear rate of 100 s1),<br/><br>
which results in a relatively low flux. The solution was subjected to heat pretreatment in an attempt<br/><br>
to decrease the viscosity and increase the flux. Pretreatment of the solution at 80 C for 72 h was found<br/><br>
to reduce the viscosity by 25%. The flux during ultrafiltration with a 10 kDa ceramic membrane increased<br/><br>
from 48 l/m2 h, for the untreated solution, to 62 l/m2 h. The increase in flux was lower than expected, and<br/><br>
this was attributed to the formation of a fouling layer of acid-insoluble compounds on the membrane.<br/><br>
Both hemicelluloses and lignin were partly degraded. The retention of lignin was reduced from about<br/><br>
30% to 18%, whereas the retention of hemicelluloses was above 95%, and was not affected by heat pretreatment.<br/><br>
The decrease in lignin retention after heat pretreatment results in improved separation of<br/><br>
hemicelluloses and lignin, facilitating the purification of hemicelluloses.},
  author       = {Arkell, Anders and Krawczyk, Holger and Jönsson, Ann-Sofi},
  issn         = {1873-3794},
  keyword      = {Ultrafiltration,Ceramic membrane,Hemicelluloses,Wheat bran,Heat pretreatment},
  language     = {eng},
  pages        = {46--50},
  publisher    = {Elsevier},
  series       = {Separation and Purification Technology},
  title        = {Influence of heat pretreatment on ultrafiltration of a solution containing hemicelluloses extracted from wheat bran},
  url          = {http://dx.doi.org/10.1016/j.seppur.2013.09.001},
  volume       = {119},
  year         = {2013},
}