Method for preparing acetic acid and/or methyl acetate by...

C - Chemistry – Metallurgy – 07 – C

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C07C 69/14 (2006.01) C07C 51/353 (2006.01) C07C 53/08 (2006.01) C07C 67/293 (2006.01) C07C 67/36 (2006.01)

Patent

CA 2250046

A method for preparing acetic acid and/or methyl acetate by means of a methyl formate isomerisation reaction is disclosed. The method is carried out in the presence of methyl formate, water, a solvent and a catalytic system including at least one halogenated promoter and at least one iridium compound. According to the method, a partial carbon monoxide pressure of 0.1.10 5 Pa to 25.10 5 Pa is maintained during the reaction, and the amount of methyl formate is maintained at less than 20 wt % based on the weight of the reaction medium.

La présente invention a pour objet la préparation d'acide acétique et/ou d'acétate de méthyle en mettant en oeuvre une réaction d'isomérisation de formiate de méthyle. Le procédé est mis en oeuvre en présence de formiate de méthyle, d'eau, d'un solvant et d'un système catalytique comprenant au moins un promoteur halogéné et au moins un composé à base d'iridium. La caractéristique du procédé est que l'on maintient pendant la réaction, une pression partielle en monoxyde de carbone comprise entre 0,1.10<5> Pa et 25.10<5> Pa, et en ce que l'on maintient une quantité en formiate de méthyle inférieure à 20 % en poids du mélange réactionnel.

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