Electrochemical membrane-assisted pH-swing extraction and back-extraction of lactic acid
Loading...
Authors
Author (Corporation)
Publication date
2022
Typ of student thesis
Course of study
Collections
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Separation and Purification Technology
Special issue
DOI of the original publication
Link
Series
Series number
Volume
289
Issue / Number
Pages / Duration
Patent number
Publisher / Publishing institution
Elsevier
Place of publication / Event location
Edition
Version
Programming language
Assignee
Practice partner / Client
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
Subject (DDC)
Event
Exhibition start date
Exhibition end date
Conference start date
Conference end date
Date of the last check
ISBN
ISSN
1873-3794
1383-5866
1383-5866
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
License
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