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Recovery of 3-hydroxypropionic acid from organic phases after reactive extraction with amines in an alcohol-type solvent

Abstract : Reactive extraction is a well-known method for the recovery of organic acids from dilute streams. The extraction through complex formation with amines is followed by its back-extraction. Their affinity for amine extractants makes their back-extraction a limiting step. The case of 3-hydroxypropionic acid is addressed here. Three methods were compared: salts additions, diluent swing and temperature swing. Mineral bases led to complete 3-HP recovery but as a salt. Diluent swing was tested using n-hexane as the anti-solvent. Results showed that increasing the n-hexane content led to a great increase of 3-HP recovery. However, high recovery yields are associated with high dilutions. The temperature was varied from 4 to 140 °C and it led to a high decrease of the acid-amine complex formation. Our thermochemical study showed an apparent heat of reaction of-25.3 kJ/mol and, at 140 °C, 78% of 3-HP can be recovered in a single step.
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Submitted on : Saturday, May 2, 2020 - 5:26:09 PM
Last modification on : Monday, August 31, 2020 - 3:39:42 PM

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F. Chemarin, M. Moussa, F. Allais, Ioan-Cristian Trelea, V. Athes. Recovery of 3-hydroxypropionic acid from organic phases after reactive extraction with amines in an alcohol-type solvent. Separation and Purification Technology, Elsevier, 2019, 219, pp.260-267. ⟨10.1016/j.seppur.2019.02.026⟩. ⟨hal-02560888⟩

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