Liquid-liquid equilibria for (volatile fatty acids + water + alcohol ethoxylates): Experimental measurement of pseudo-ternary systems

•Phase diagrams for systems containing VFAs + water + N23E2 were established at 308.15 K.•The surfactant extraction effectiveness follows: butyric > propionic > acetic.•The surfactant could possibly be used for extractive fermentation of butyric acid. Experiments were conducted to establish th...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 2019-01, Vol.128, p.207-214
Main Authors: Belgodere, Jorge A., Revellame, Emmanuel D., Hernandez, Rafael, Holmes, William, Collazos, Lance, Bajpai, Rakesh, Zappi, Mark E.
Format: Article
Language:English
Subjects:
Alcohol ethoxylate
Extractive fermentation
Liquid-liquid equilibria
Surfactant
Volatile organic acids
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Summary:•Phase diagrams for systems containing VFAs + water + N23E2 were established at 308.15 K.•The surfactant extraction effectiveness follows: butyric > propionic > acetic.•The surfactant could possibly be used for extractive fermentation of butyric acid. Experiments were conducted to establish the phase diagrams for ternary systems containing (acetic acid or propionic acid or butyric acid + water + alcohol ethoxylate surfactant) at 308.15 K and ambient pressure. Results indicated that the systems belong to Type 1 Treybal classification with water–surfactant binary pair exhibiting partial miscibility. The liquid–liquid equilibrium data were used to determine the ability of the surfactant to extract the acids from aqueous solutions. The calculated distribution coefficients and separation factors indicated that the effectiveness of the surfactant to extract acids follow the trend: butyric acid > propionic acid > acetic acid. The effectiveness of the surfactant to extract butyric acid from aqueous solutions is similar to previously studied environmentally-friendly solvents with added benefit of being non-inhibitory to microbial growth and metabolism. These characteristics of the alcohol ethoxylate used in this study could be exploited for the development of an extractive butyric acid fermentation process.
ISSN:0021-9614
1096-3626
DOI:10.1016/j.jct.2018.08.027