Hoechst Aktiengesellschaft

Heinz Schmitz

Gunter Roscher

Friedrich Wunder

Hans-Joachim Schmidt

Hans Fernholz

Hans Krekeler

Helmut Schaum

G/u/ Nter Roscher

Unsaturated esters of carboxylic acids are prepared by reacting olefines or cycloolefines with carboxylic acids and oxygen in the gaseous phase in the presence of a catalyst containing noble metal salts or noble metals of the VIII.sup.th group of the Periodic System and alcali metal salts and/or alcaline earth metal salts, as activators the content of noble metal being in the range of from 1.2 to 5% by weight and the proportion of the metal fraction of each individual activator to the noble metal content being in the range of from 0.5 to 1 to 3:1.

Process for the manufacture of unsaturated esters of carboxylic acids

A process is provided for the preparation of practically formic acid-free acetic acid by oxidation of acetaldehyde in the liquid phase with oxygen or oxygen-containing gases in the presence of mixtures of cobalt, nickel and manganese salts as catalysts.

Process for the preparation of practically formic acid-free acetic acid

The invention relates to a process for the partial separation of water from gas mixtures formed in the manufacture of vinyl acetate by reaction of ethylene with acetic acid and oxygen in the gaseous phase and in the presence of catalysts. In a 'predehydration column', more than half of the water formed in the reaction is eliminated without requiring energy feed. The mixture obtained which is relatively poor in water is worked up according to known methods.

Process for the separation of water from gas mixtures formed in the

A process for the preparation of a palladium catalyst for the oxacylation of olefins in the gaseous phase, which comprises impregnating a catalyst carrier with a solution of a palladium compound drying the catalyst at a temperature of below 90.degree. C until a residual solvent content of less than 8% by weight is attained, and reducing the impregnated catalyst with a gas mixture of inert gas and reducing agent.

Process for the preparation of a palladium catalyst

Process for the preparation of allyl acetate from acetic acid, propylene and oxygen in the gaseous phase in the presence of catalysts containing noble metals, using technical crude olefins containing less than 50 per cent by volume of propylene apart from propane.

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Frankfurt am Main, Germany

Heinz Schmitz