Hoechst Aktiengesellschaft

Hermann Neu

Gunter Roscher

Hans Fernholz

Dominik Dempf

Klaus H Kaiser

Horst Langner

Karl-Heinz Schmidt

Aladar Lienerth

G/u/ Nter Roscher

The invention relates to a process for the preparation of unsaturated aliphatic carboxylic acids by thermal cracking of the polymeric intermediate product ('polyester') which is formed in the catalytic reaction of aldehydes or ketones with ketene. The reaction mixture containing polyester is heated with water, and the polyester is then isolated and subjected to cracking. Or the polyester is first isolated and then heated with water and finally subjected to cracking. In both cases the temperature when the mixture is heated with water is the same as the boiling point, or is less than 40.degree. C. below the boiling point, of the aqueous mixture.

Process for the preparation of unsaturated aliphatic carboxylic acids

Process for separating water from a gas mixture, obtained in the manufacture of vinyl acetate by reacting ethylene with acetic acid and oxygen in contact with catalysts containing palladium or palladium compounds in the gaseous phase said gas mixture consisting essentially of acetic acid, vinyl acetate, water, carbon dioxide and ethylene, wherein

Process for separating water from mixtures thereof with vinyl acetate

Process for preserving bread and bakery products with sorbic acid by adding to the dough before baking a coarsely crystalline sorbic acid.

Process for preserving bread and bakery products with sorbic acid

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Neu-Isenburg, Germany

Hermann Neu