Wacker-chemie Gmbh

Hoechst Aktiengesellschaft

Dominik Dempf

Ludwig Schmidhammer

Gunter Roscher

Karl-Heinz Schmidt

Rudolf Knabl

Rudolf Strasser

Gerhard Dummer

Wolfgang Deinhammer

Klaus H Kaiser

Hermann Neu

Horst Langner

Aladar Lienerth

Ernst Selbertinger

Wilhelm Mack

Georges Heyen

Thomas List

Otto Fruhwirth

The invention provides a process for preparing 1,3-diketones by rearrangement of the isomeric enol ester in a tube reactor comprising a heated portion and an unheated insulated portion which can optionally be provided with cooling means. The unheated portion of the reactor has a higher volume to surface ratio than the heated portion of the reactor. The reaction can be carried out adiabatically in the unheated portion of the reactor. The process and apparatus provide higher yields and selectivity to the 1,3-diketones.

Process for preparing 1,3-diketones

The invention relates to a process for the manufacture of unsaturated carboxylic acid esters by the reaction of olefins or cyclo-olefins with oxygen and carboxylic acids in the gaseous phase, in the presence of a catalyst which contains elements of the subsidiary group VIII of the periodic system and/or compounds thereof, and an alkali metal acetate, at temperatures of from 100.degree. to 250.degree. C. and pressures of from 0.5 to 21 bar absolute, wherein from 1 to 8000 parts per million (by weight), calculated on the carboxylic acid used, of organic chlorine compounds are added to the reaction mixture.

Process for the manufacture of unsaturated carboxylic acid esters

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

Stabilized perchloroethylene containing 0.001 to 0.1% by weight of N-alkylmorpholine, 0.001 to 0.01% by weight of alkylphenols, 0.0005 to 0.002% by weight of diisopropylamine, and 0.05 to 0.5% by weight of cyclohexeneoxide. By stabilization with the mixture of stabilizers, the perchloroethylene is stabilized to an extraordinary degree against attack by metals, particularly, decomposition through oxidation in contact with metals or metal salts, in some cases also upon exposure to light. A further improvement of the combined stabilizing action can be obtained by the addition of 0.005 to 0.1% by weight of epoxipropanol.

Stabilized perchloroethylene

A stabilized 1,1,1-trichloroethane containing, as stabilizer, from

Stabilized 1,1,1-trichloroethane

This invention relates to an improved stabilization of perchloroethylene by adding thereto a mixture of from 0.001% to 0.01% by weight of a possibly alkylated N-alkyl-morpholine and from 0.001% to 0.01% by weight of an alkylphenol; as well as the so-stabilized perchloroethylene.

Stabilization of perchloroethylene

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Mehring-Od, Germany

Dominik Dempf