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Electrocarboxylation in supercritical CO2 and CO2-expanded liquids

Chanfreau, Sébastien and Cognet, Patrick and Camy, Séverine and Condoret, Jean-Stéphane Electrocarboxylation in supercritical CO2 and CO2-expanded liquids. (2008) The Journal of Supercritical Fluids, vol. 4 (n° 2). pp. 156-162. ISSN 0896-8446

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Official URL: http://dx.doi.org/10.1016/j.supflu.2008.04.003

Abstract

In this study, the electrocarboxylation of benzyl chloride in pressurized CO2, or pressurized mixtures of dimethylformamide (DMF) and CO2, was investigated in order to synthesize phenylacetic acid. A stainless steel cathode was used as the working electrode, whereas a sacrificial massive magnesium rod or a platinized platinum grid was used as the anode, tetrabutylammonium perchlorate (TBAP) or tetrakis(decyl)ammonium tetraphenylborate (TDATPhB) being the supporting electrolyte. The electrocarboxylation was carried out at 40 ◦C, at operating pressures of 1, 6, 7, 8, 9 and 12MPa, using current densities ranging from 0.1 to 150mAcm−2. It was found that a small amount of DMF was necessary to ensure the solubility of the supporting electrolyte, to obtain sufficient electrical conductivity of the medium. The best resultswere obtained using the magnesium sacrificial anode, at 6MPa. After consumption of the theoretical amount of electrical current (2F mol−1), 65.7% benzyl chloride conversion was reached, together with an 82.4% phenylacetic acid selectivity and a 54.2% faradaic yield. Detected by-productswere toluene, bibenzyle, benzyl alcohol and benzaldehyde.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at The Journal of Supercritical Fluids website : http://www.sciencedirect.com/science/journal/08968446
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Réaction, mélange & séparation (RMS)
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Deposited By: Hélène Dubernard

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