Oxidation treatment of a recycle stream in production of...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/12 (2006.01) C07C 51/487 (2006.01) C07C 53/08 (2006.01) C08F 8/00 (2006.01)

Patent

CA 2477448

A method and system is provided for producing acetic acid by the catalytic carbonylation of methanol with carbon monoxide to obtain a reaction product stream comprising acetic acid and a minor amount of acetaldehyde. The acetaldehyde content in the reaction product stream is reduced by oxidation to convert at least a portion or the acetaldehyde in the stream to acetic acid or further to CO2 and H2O. The oxidized stream may then be directed to the purification section, the reaction section, or both whereby the deleterious effects of acetaldehyde are reduced. Advantage of the present invention over conventional process is the reduced need to dispose of acetaldehyde as waste and improved overall system efficiency in the production of acid.

L'invention concerne un procédé et un système pour la production d'acide acétique par carbonylation catalytique de méthanol avec du monoxyde de carbone, donnant un flux de produit de réaction qui renferme de l'acide acétique et une quantité mineure d'acétaldéhyde. La teneur en acétaldéhyde du produit de réaction est réduite par oxydation, ce qui permet de convertir au moins une partie de l'acétaldehyde du flux en acide acétique ou bien en plus en CO¿2? et H¿2?O. Ensuite, le flux oxydé peut être orienté vers l'étage de purification, l'étage de réaction, ou les deux à la fois, moyennant quoi on diminue les effets délétères de l'acétaldéhyde. L'avantage de cette technique sur les techniques classiques est que l'on diminue la nécessité d'éliminer l'acétaldéhyde comme déchet, avec une amélioration de l'efficacité globale du système dans la production d'acide acétique.

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