Process for preparing carboxylic acids

Details Process for preparing carboxylic acids Process for preparing carboxylic acids

C - Chemistry, Metallurgy

07

C

260/529.6

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

Patent

CA 2009739

Case 7157(2) ABSTRACT OF THE DISCLOSURE PROCESS FOR PREPARING CARBOXYLIC ACIDS An improved liquid-phase process for preparing carboxylic acids having (n + 1) carbon atoms by rhodium catalysed carbonylation of an alcohol having n carbon atoms is provided. The process is particularily suitable for preparing acetic acid from methanol in commercial carbonylation reactors operating at steady-state with a low standing quantity of water (eg 0.5 to 5% by weight). The improvement lies in carrying out the carbonylation in the presence of an iodide stabiliser (eg lithium iodide) and a Group VI B metal costabiliser. The process can optionally be carried out in the presence of hydrogen.

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