Abstract
The aim of this work is to investigate the use of a new type of reactor for electroorganic synthesis. The concept of the reactor is based on the principle of the porous percolated pulsed electrode (E3P) which was primarily developed at commercial scale for metal recovery in waste waters. The reactor is fitted with a three-dimensional electrode, of axial configuration, consisting of ordered stacks of discs of expanded metal. It can be supplied either by a homogeneous electrolyte or by an emulsion generated by an external ultrasonic system. The pulsation of the electrolyte represents a very effective means of improving mass transfer rates at the electrode. Under two phase conditions, the role of the pulsation is also to ensure the hydraulic transport of the emulsion and to increase the three phase contacts between the aqueous phase, the organic phase and the electrode. The efficiency of the reactor was tested using both homogeneous and two phase liquid–liquid electrolytes in the direct reduction process of an aromatic ketone. This study reports the effects of the pulsation on the mass transfer rate of acetophenone at the electrode. A comparative study of the behaviour of the E3P reactor towards different media is accomplished. Particular attention is paid to the chemical and faradaic yields, as well as to the selectivity of the reaction.
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Belmant, C., Cognet, P., Berlan, J. et al. Application of an electrochemical pulsed flow reactor to electroorganic synthesis: Part I: Reduction of acetophenone. Journal of Applied Electrochemistry 28, 185–191 (1998). https://doi.org/10.1023/A:1003282709485
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DOI: https://doi.org/10.1023/A:1003282709485