AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA CHEMIA - Ediţia nr.4 din 2010 | |||||||
Articol: |
OBTAINING PYRAZINE-2,3-DICARBOXYLIC ACID THROUGH ELECTROCHEMICAL OXIDATION OF QUINOXALINE ON NICKEL ELECTRODE. Autori: POPA IULIANA, DRAGOŞ ANA, VLĂTĂNESCU NANDINA, MARIUS DOBRESCU, ŢĂRANU BOGDAN. |
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Rezumat: The purpose of this paper is to show the studies made on the pyrazine-2,3-dicarboxylic acid (PDCA) synthesis process by quinoxaline chemical oxidation on the nickel electrode with electrochemically regenerated potassium permanganate (KMnO4). It was followed the investigation of electrode reaction through cyclic voltammetry and the making of an efficient electrolyser for PDCA synthesis. Anodic regeneration of Mn7+ on the nickel electrode is possible. This process is favoured by KOH, Mn7+ (Mn6+ implicitly) and quinoxaline concentrations increase as well as temperature increase. Current and substance efficiencies of 80% and 85%, respectively, were achieved. Keywords: quinoxaline, pyrazine-2,3-dicarboxylic acid, potassium permanganate, cyclic voltammetry, electrolysis, nickel electrode. |
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