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AssigneeHoechst Aktiengesellschaft
InventorsRoland Abel, Karl-Fred Worner
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The invention relates to Pd/K/Au, Pd/K/Ba, or Pd/K/Cd supported catalysts having an impregnated layer structure, the production thereof and also the use thereof for preparing vinyl acetate from ethylene, acetic acid and oxygen in the gas phase. The catalysts specified are produced by spraying the support particles, while mixing intimately with a solution of salt of the corresponding elements in the form of drops having an average diameter of at least 0.3 mm or in the form of liquid jets and then drying the support particles immediately, with the dynamic viscosity of the solution being at least 0.003 Pa.cndot.s and the solution volume in spraying being from 5 to 80% of the pore volume of the support particles.
A process for preparing vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases in the presence of a surface impregnated catalyst comprising palladium, potassium and cadmium on porous support particles, wherein the support particles are, while mixing intimately, sprayed once or a plurality of times with at least one solution of at least one salt of each of the three elements in the form of drops having an average diameter of at least 0.3 mm or in the form of liquid jets and are immediately dried after each spraying, with the dynamic viscosity of the solution being at least 0.003 Pa.cndot.s and the solution volume in each spraying being from 5 to 80% of the pore volume of the support particles.
A process for preparing vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases in the presence of a surface impregnated catalyst comprising palladium, potassium and barium on porous support particles, wherein the support particles are, while mixing intimately, sprayed once or a plurality of times with at least one solution of at least one salt of each of the three elements in the form of drops having an average diameter of at least 0.3 mm or in the form of liquid jets and are immediately dried after each spraying, with the dynamic viscosity of the solution being at least 0.003 Pa.cndot.s and the solution volume in each spraying being from 5 to 80% of the pore volume of the support particles.
A process for preparing vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases in the presence of a surface impregnated catalyst comprising palladium, potassium and gold on porous support particles, wherein the support particles are, while mixing intimately, sprayed once or a plurality of times with at least one solution of at least one salt of each of the three elements in the form of drops having an average diameter of at least 0.3 mm or in the form of liquid jets and are immediately dried after each spraying, with the dynamic viscosity of the solution being at least 0.003 Pa.cndot.s and the solution volume in each spraying being from 5 to 80% of the pore volume of the support particles.
Dependencies are inferred from the claim text.