Investigation of the electrosynthetic pathway of the aldol condensation of acetone

•The potential-controlled aldol condensation of acetone to diacetone alcohol is performed.•Additional water in the electrolyte has a disadvantageous effect on the reaction.•The concentration increase of diacetone alcohol describes an exponential curve. The potential-controlled electrochemical aldol...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2016-04, Vol.289, p.554-561
Hauptverfasser: Pauwels, Danny, Hereijgers, Jonas, Verhulst, Kristof, De Wael, Karolien, Breugelmans, Tom
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Sprache:eng
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Zusammenfassung:•The potential-controlled aldol condensation of acetone to diacetone alcohol is performed.•Additional water in the electrolyte has a disadvantageous effect on the reaction.•The concentration increase of diacetone alcohol describes an exponential curve. The potential-controlled electrochemical aldol condensation of acetone to diacetone alcohol in a standard batch electrolysis set-up was studied in this work. It is confirmed that the reaction proceeds at the cathode and that, contrary to what is mentioned in earlier literature, water in the electrolyte has a disadvantageous effect on the reaction. Similar to the chemical reaction, the electrochemical reaction reaches a maximum yield when the equilibrium is reached. Separating the anode and cathode prevents cross-over and degradation of products, leading to a higher yield. Starting with pure acetone and support electrolyte, it was possible to obtain a diacetone alcohol concentration of 15m% after 2h electrolysis in a divided set-up with a platinum electrode at −2.5V. The concentration gradient throughout the electrolysis follows an exponential curve up to its equilibrium concentration.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2016.01.018