Electrochemical membrane-assisted pH-swing extraction and back-extraction of lactic acid

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Authors
Gausmann, Marcel
Bertram, Franziska
Schuur, Boelo
Jupke, Andreas
Author (Corporation)
Publication date
2022
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Type
01A - Journal article
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Parent work
Separation and Purification Technology
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Volume
289
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Pages / Duration
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Publisher / Publishing institution
Elsevier
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Abstract
Reactive extraction of carboxylic acids such as lactic acid with tertiary amines is a state-of-the-art process but suffers strongly from reduced extraction efficiency in buffered environments like fermentation broths. In order to increase the efficiency of in-situ product removal, we here propose the combination of a membrane-assisted reactive extraction with an electrochemical pH shift. Prior to extraction in the membrane module, the fermentation broth containing the lactic acid at neutral pH is treated by anodic electrolysis to reduce the pH and thereby improve the extraction yield. Additionally, the cathodic reaction is used to increase the pH of the aqueous stream used for back-extraction of the loaded organic phase. Model solutions were used to develop a mathematical model, capable of calculating the required membrane area for in-situ extractions, considering the effect of the aqueous pH on the extraction performance. Additionally, using electrochemical pH shift, we were able to concentrate lactic acid from 1 wt% in the dilute broth to 7 wt% in the back extract.
Keywords
Lactic acid, Electrochemical separation, pH shift extraction, Membrane contactor, Reactive extraction
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ISBN
ISSN
1873-3794
1383-5866
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
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Peer review of the complete publication
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Closed
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Citation
Gausmann, M., Bertram, F., Schuur, B., Jupke, A., Gössi, A., & Riedl, W. (2022). Electrochemical membrane-assisted pH-swing extraction and back-extraction of lactic acid. Separation and Purification Technology, 289. https://doi.org/10.1016/j.seppur.2022.120702