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Conversion of sodium lactate to lactic acid with water-splitting electrodialysis

Persson, A; Garde, A; Jönsson, Ann-Sofi LU ; Jonsson, G and Zacchi, Guido LU (2001) In Applied Biochemistry and Biotechnology 94(3). p.197-211
Abstract
The conversion of sodium lactate to lactic acid with water-splitting electrodialysis was investigated. One way of reducing the power consumption is to add a conductive layer to the acid compartment. Doing this reduced the power consumption by almost 50% in a two-compartment cell, whereas the electric current efficiency was not affected at all. Three different solutions were treated in the electrodialysis unit: a model solution with 70 g/L of sodium lactate and a fermentation broth that had been prefiltered two different ways. The fermentation broth was either filtered in an open ultrafiltration membrane (cut-off of 100,000 Dalton) in order to remove the microorganisms or first filtered in the open ultrafiltration membrane and then in an... (More)
The conversion of sodium lactate to lactic acid with water-splitting electrodialysis was investigated. One way of reducing the power consumption is to add a conductive layer to the acid compartment. Doing this reduced the power consumption by almost 50% in a two-compartment cell, whereas the electric current efficiency was not affected at all. Three different solutions were treated in the electrodialysis unit: a model solution with 70 g/L of sodium lactate and a fermentation broth that had been prefiltered two different ways. The fermentation broth was either filtered in an open ultrafiltration membrane (cut-off of 100,000 Dalton) in order to remove the microorganisms or first filtered in the open ultrafiltration membrane and then in an ultrafiltration membrane with a cut-off of 2000 Dalton to remove most of the proteins. The concentration of sodium lactate in the fermentation broth was 70 g/L, as well. Organic molecules present in the broth (peptides and similar organic material) fouled the membranes and, therefore, increased power consumption. Power consumption increased more when permeate from the more open ultrafiltration membrane was treated in the electrodialysis unit than when permeate from the membrane with the lower cut-off was treated, since there was a higher amount of foulants in the former permeate. However, the electrodialysis membranes could be cleaned efficiently with a 0.1 M sodium hydroxide solution. (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
lactic acid, electrodialysis, bipolar membranes, fermentation broth, wheat
in
Applied Biochemistry and Biotechnology
volume
94
issue
3
pages
197 - 211
publisher
Humana Press
external identifiers
  • wos:000170691400001
  • scopus:0034862333
ISSN
1559-0291
DOI
10.1385/ABAB:94:3:197
language
English
LU publication?
yes
id
33f1d137-274f-4374-a6be-74cbf9a233a4 (old id 3911301)
date added to LUP
2013-07-01 08:36:35
date last changed
2018-05-29 12:31:38
@article{33f1d137-274f-4374-a6be-74cbf9a233a4,
  abstract     = {The conversion of sodium lactate to lactic acid with water-splitting electrodialysis was investigated. One way of reducing the power consumption is to add a conductive layer to the acid compartment. Doing this reduced the power consumption by almost 50% in a two-compartment cell, whereas the electric current efficiency was not affected at all. Three different solutions were treated in the electrodialysis unit: a model solution with 70 g/L of sodium lactate and a fermentation broth that had been prefiltered two different ways. The fermentation broth was either filtered in an open ultrafiltration membrane (cut-off of 100,000 Dalton) in order to remove the microorganisms or first filtered in the open ultrafiltration membrane and then in an ultrafiltration membrane with a cut-off of 2000 Dalton to remove most of the proteins. The concentration of sodium lactate in the fermentation broth was 70 g/L, as well. Organic molecules present in the broth (peptides and similar organic material) fouled the membranes and, therefore, increased power consumption. Power consumption increased more when permeate from the more open ultrafiltration membrane was treated in the electrodialysis unit than when permeate from the membrane with the lower cut-off was treated, since there was a higher amount of foulants in the former permeate. However, the electrodialysis membranes could be cleaned efficiently with a 0.1 M sodium hydroxide solution.},
  author       = {Persson, A and Garde, A and Jönsson, Ann-Sofi and Jonsson, G and Zacchi, Guido},
  issn         = {1559-0291},
  keyword      = {lactic acid,electrodialysis,bipolar membranes,fermentation broth,wheat},
  language     = {eng},
  number       = {3},
  pages        = {197--211},
  publisher    = {Humana Press},
  series       = {Applied Biochemistry and Biotechnology},
  title        = {Conversion of sodium lactate to lactic acid with water-splitting electrodialysis},
  url          = {http://dx.doi.org/10.1385/ABAB:94:3:197},
  volume       = {94},
  year         = {2001},
}