Acetex Chimie

Arkema France

Institut National Polytechnique De Toulouse

Philippe Serp

Philippe J Kalck

Daniel Marcel Thiebaut

Carole Le Berre

Daniel Marchand

Lise Layeillon

Massimiliano Corrias

This invention relates to a solid divided composition comprising grains whose mean size is greater than 25 &#x3bc;m and less than 2.5 mm, wherein each grain is provided with a solid porous core and a homogeneous continuous metal layer consisting of at least one type of transition non-oxidised metal and extending along a gangue coating the core in such a way that pores are inaccessible. A method for the production of said composition and for the use thereof in the form of a solid catalyst is also disclosed.

Divided solid composition composed of grains provided with continuous metal deposition, method for the production and use thereof in the form of a catalyst

The invention relates to a continuous process for the manufacture of acetic acid and/or methyl acetate, characterized in that, during the continuous operation of the installation for a continuous industrial process, called the initial process, for the carbonylation of methanol or a carbonylatable derivative of methanol such as dimethyl ether, methyl halides or methyl acetate, in the homogeneous liquid phase and under carbon monoxide pressure, in the presence of a catalyst system comprising a rhodium-based homogeneous catalyst and a halogenated promoter, and in the presence of a concentration of water greater than or equal to 14% in the reaction medium, the composition of said homogeneous catalyst is modified gradually by adding an iridium compound over time. This process makes it possible on the one hand to modify the composition of the catalyst system so as to change from a homogeneous catalyst based on rhodium alone to a catalyst based on rhodium and iridium, or even iridium alone, without stopping the installation, and on the other hand to reduce the water content of the reaction medium once the iridium additions have been effected.

Modification of the catalytic system in an industrial process for making acetic and/or methyl acetate acid

The invention relates to a process for the preparation of acetic acid and/or methyl acetate in the liquid phase by the carbonylation of methanol and/or the isomerization of methyl formate in the presence of water, a solvent, a homogeneous catalyst system comprising iridium and a halogen-containing promoter, and carbon monoxide, wherein said catalyst system also comprises platinum.

Method for preparing acetic acid and or methyl acetate in the presence of iridium and platinum

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Toulouse, France

Philippe Serp