Vinyl acetate catalyst preparation method

B - Operations – Transporting – 01 – J

Patent

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

Patent

CA 2125779

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 paliadium and gold, fixing the palladium and gold on the support as water insoluble compounds by contacting the salt-impregnated support with a reactive solution in two separate fixing stages wherein the treated support is dried and allowed to stand prior to treatment in the second stage to precipitate 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.

L'invention concerne une méthode servant à la préparation d'un catalyseur particulièrement utile dans la réaction de l'éthylène, de l'oxygène et de l'acide acétique en phase gazeuse pour la production d'acétate de vinyle et consistant à imprégner un support poreux de sels de palladium et d'or hydrosolubles et à fixer le palladium et l'or au support sous forme de composés insolubles dans l'eau en mettant en contact le support imprégné de sels avec une solution de réactif en deux étapes de fixation distinctes au cours desquelles le support traité est séché et laissé à reposer après quoi les composés insolubles sont précipités sur le support puis réduits en palladium et en or libres. Les catalyseurs préparés suivant cette méthode sont une amélioration au point de vue de la sélectivité réduite s'exerçant par rapport au CO2 durant la formation de l'acétate de vinyle.

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