Vinyl acetate catalyst comprising metallic palladium, copper...

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B01J 23/89 (2006.01) B01J 23/52 (2006.01) C07C 67/055 (2006.01)

Patent

CA 2333376

A catalyst for the production of vinyl acetate by reaction of ethylene, oxygen and acetic acid comprising a porous support on the porous surfaces of which is deposited catalytically effective amounts of metallic palladium, gold and copper, said catalyst having been prepared by steps comprising impregnating said support, the porous surfaces of which contain catalytically effective amounts of prereduced metallic palladium and copper, with a solution of potassium aurate, and reducing the potassium aurate to a catalytically effective amount of metallic gold. Alternatively, the support may first be contacted with gold followed by contact with palladium/copper complexes. A still further alternative includes use of sodium free reagents.

Ce catalyseur est destiné à la production d'acétate de vinyle par réaction d'éthylène, d'oxygène et d'acide acétique. Il est constitué d'un support poreux sur les surfaces poreuses duquel sont déposées des quantités catalytiquement efficaces de palladium, d'or et de cuivre à l'état métallique. Le procédé de réalisation de ce catalyseur consiste à prendre ce support dont les surfaces poreuses contiennent des quantités catalytiquement efficaces de palladium et de cuivre métallique préalablement réduits, et à les imprégner d'une solution d'aurate de potassium. Le procédé consiste ensuite à réduire l'aurate de potassium en une quantité catalytiquement efficace d'or métallique. Une autre façon de faire est de prendre le support et de le mettre en contact d'abord avec de l'or, puis avec des complexes palladium-cuivre. Une façon de faire encore différence consiste à utiliser des réactifs exempts de sodium.

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