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Open AccessArticle

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, 8010 Graz, Austria
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ChemEngineering 2019, 3(2), 43; https://doi.org/10.3390/chemengineering3020043
Received: 19 February 2019 / Revised: 16 April 2019 / Accepted: 19 April 2019 / Published: 30 April 2019
The present work develops the basics for the isolation of lactic acid, acetic acid and formic acid from a single as well as a mixed feed stream, as is present, for example, in fermentation broth for lactic acid production. Modelling of the phase equilibria data is performed using the law of mass action and shows that the acids are extracted according to their pka value, where formic acid is preferably extracted in comparison to lactic and acetic acid. Back-extraction was performed by 1 M NaHCO3 solution and shows the same tendency regarding the pka value. Based on lactic acid, the solvent phase composition, consisting of tri-n-octylamine/1-octanol/n-undecane, was optimized in terms of the distribution coefficient. The data clearly indicate that, compared to physical extraction, mass transfer can be massively enhanced by reactive extraction. With increasing tri-n-octylamine and 1-octanol concentration, the equilibrium constant increases. However, even when mass transfer increases, tri-n-octylamine concentrations above 40 wt%, lead to third phase formation, which needs to be prevented for technical application. The presented data are the basis for the transfer to liquid membrane permeation, which enables the handling of emulsion tending systems. View Full-Text
Keywords: carboxylic acids; lactic acid recovery; reactive extraction; phase equilibrium carboxylic acids; lactic acid recovery; reactive extraction; phase equilibrium
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Mungma, N.; Kienberger, M.; Siebenhofer, M. Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane. ChemEngineering 2019, 3, 43.

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