Process for the production of acetic acid

C - Chemistry – Metallurgy – 07 – C

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C07C 51/12 (2006.01) C07C 53/08 (2006.01)

Patent

CA 2498821

A process for the production of acetic acid by carbonylating methanol and/or a reactive derivative thereof with carbon monoxide in at least one carbonylation reaction zone containing a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide co-catalyst, a finite concentration of water, acetic acid, methyl acetate, at least one promoter selected from ruthenium, osmium and rhenium and at least one catalyst system stabiliser selected from indium, cadmium, mercury, gallium and zinc and wherein the molar ratio of iridium : promoter: stabiliser in the liquid reaction composition is maintained in the range 1: (>2 to 15) : (0.25 to 12).

L'invention concerne un procédé de production d'acide acétique par carbonylation de méthanol et/ou d'un dérivé réactif de ce dernier avec un monoxyde de carbone dans au moins une zone de réaction de carbonylation contenant une composition réactionnelle liquide contenant un catalyseur de carbonylation iridium, un co-catalyseur iodure de méthyle, une concentration finie d'eau, de l'acide acétique, de l'acétate de méthyle, au moins un promoteur sélectionné parmi le ruthénium, l'osmium et le rhénium et au moins un stabilisateur de système catalyseur sélectionné parmi l'indium, le cadmium, le mercure, le gallium et le zinc et où le rapport molaire iridium/promoteur/stabilisateur dans la composition réactionnelle liquide est maintenue approximativement à 1: (>2 à 15): (0,25 à 12).

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