Rhodium/inorganic iodide catalyst system for methanol...

Details Rhodium/inorganic iodide catalyst system for methanol... Rhodium/inorganic iodide catalyst system for methanol...

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2381420

The method of the present invention provides an improvement upon prior art methanol carbonylation methods which substantially reduces the production of carbonyl impurities. The production of carbonyl impurities, particularly acetaldehyde, crotonaldehyde, and 2-ethyl crotonaldehyde, in methanol carbonylation reactions has been found to decrease by maintaining a partial pressure of hydrogen between about 0.1 and 4 psia at reaction total pressure of from about 15 to about 40 atmospheres total reaction pressure.

L'invention concerne un procédé permettant d'améliorer, par rapport à ce qui était connu dans ce domaine, les procédés de carbonylation de méthanol. Ce procédé permet de réduire considérablement la production d'impuretés de carbonyle. Cette production d'impuretés de carbonyle, et tout particulièrement d'acétaldéhyde, de crotonaldéhyde, et de 2-éthyl crotonaldéhyde, dans les réactions de carbonylation de méthanol, a été réduite en conservant une pression partielle d'hydrogène comprise entre 0,1 et 4 psia environ à la réaction à pression totale de 15 à 40 atmosphères environ, pour une réaction à pression totale.

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