Vinyl acetate catalyst preparation method

B - Operations – Transporting – 01 – J

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B01J 37/03 (2006.01) B01J 23/38 (2006.01) B01J 23/52 (2006.01) B01J 37/02 (2006.01) B01J 37/18 (2006.01) C07C 67/055 (2006.01)

Patent

CA 2125781

A method of preparing a catalyst particularly useful in the reaction of ethylene, oxygen and acetic acid in the vapor phase to form vinyl acetate comprises impregnating a porous support with water soluble salts of palladium and gold, fixing the palladium and gold on the support as water insoluble compounds by immersing the impregnated support in a reactive solution and tumbling the impregnated support in the reactive solution for at least 1/2 hour to begin precipitation of the insoluble compounds and completing precipitation of the insoluble compounds on the support and reducing the insoluble compounds to free palladium and gold. The catalysts prepared in this manner have been shown to provide improvement with respect to reduced selectivity to CO2, during the vinyl acetate forming reaction.

Méthode de préparation d'un catalyseur particulièrement utile dans la réaction de l'éthylène, de l'oxygène et de l'acide acétique en phase vapeur en vue d'obtenir de l'acétate de vinyle. Cette méthode comprend l'imprégnation d'un support poreux avec des sels hydrosolubles de palladium et d'or, la fixation du palladium et de l'or sur le support sous forme de composés insolubles dans l'eau par immersion du support imprégné dans une solution réactive et barattage du support imprégné dans cette solution réactive pendant au moins 1/2 heure pour amorcer la précipitation des composés insolubles, puis achèvement de la précipitation des composés insolubles sur le support et réduction de ces composés en palladium et en or libres. Les catalyseurs préparés par cette méthode permettent d'améliorer le procédé en ce qui concerne la sélectivité réduite au CO2 durant la réaction de formation de l'acétate de vinyle.

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