VANADIUM CATALYSTS AND PROCESS FOR THE DIRECT CONVERSION OF METHANE INTO ACETIC ACID

• Main Authors: POMBEIRO, ARMANDO, REIS, PATRICIA M, FRAUSTO DA SILVA, JOAO, SILVA, JOSE ARMANDO, FUJIWARA, YUZO, PALAVRA, ANTONIO F
• Format: Patent
• Language: English; French
• Published: 12.08.2004
• Edition: 7
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention consists on the utilization of complexes of vanadium (in the +4 and +5 oxidation states) with bi- or poly-dentate ligands coordinated by nitrogen and oxygen (N,O) or by oxygen and oxygen (O,O) atoms, namely derivaties of aminoalcohols, (hydroxyimino)dicarboxylic acids, hydroxypyranones, trifluoroacetic acid, triflic acid or inorganic acid, as catalysts for the direct single-pot conversion, under mild conditions, of methane in acetic acid, either in the absence or in the presence of carbon monoxide, and in the presence of a peroxodisulfate salt (K2S2O8), in trifluoroacetic acid (CF3COOH), according to the general reaction (I). L'invention concerne l'utilisation de complexes de vanadium (états d'oxydation +4 et +5) avec des ligands bidentelés ou polydentelés coordonnés par des atomes d'azote et d'oxygène (N,O) ou d'oxygène et d'oxygène (O,O), à savoir: dérivés d'aminoalcools, acides (hydroxyimino)dicarboxyliques, hydroxypyranones, acide trifluoroacétique, acide triflique ou acide inorganique. Il s'agit de catalyseurs pour la conversion directe, en creuset unique, dans des conditions douces, de méthane en acide acétique, avec ou sans monoxyde de carbone, et en présence de peroxy disulfate de potassium (K2S2O8), dans de l'acide trifluoroacétique (CF3COOH), selon la réaction générale (I). V Cat.CH<4#191 > < (I) K2#191S2#191O8#191/CF3#191COOH>