Ruhrchemie Aktiengesellschaft

Hans Tummes

Boy Cornils

Jurgen Falbe

Heinz Noeske

Ludger Bexten

Josef Meis

Jurgen Weber

Volkmar Schmidt

Hans Feichtinger

Heinz-Dieter Hahn

Waldemar Kascha

Joachim Much

Walter Rottig

Dieter Ernst

Herbert Gothel

Hans-Joachim Tomuschat

Hans-Dieter Hahn

An improved process for de-cobaltizing the primary product of an oxo synthesis is disclosed wherein the primary product is contacted with steam introduced into a vessel to which the primary oxo product is introduced but initially maintained in out of contact relationship to such product by a cooling medium whereby heat transfer from the steam to the primary product is initially avoided. The primary product and steam are fed to a cylindrical reactor having a conical base, and after the steam has risen 1/2 to 2/3 of the height of the conical base it comes in contact with the primary product whose liquid level height in the vessel is maintained at one to two times the vessel's diameter. An apparatus for performing such process is also disclosed.

Process for demetallizing primary products of the oxo synthesis

A process is described for preparing aldehyde by hydroformylation of olefins, in which the olefins together with carbon monoxide, hydrogen and paraffins are introduced into a solution of rhodium carbonyl-triphenylphosphine complexes as catalyst and phosphines as solvent, the improvement wherein the gas stream entering the catalyst solution contains 5 to 30% by volume of paraffins with 1 to 5 carbon atoms.

Process for preparing aldehydes

An improvement in the process for the continuous manufacture of an aldehyde by reaction of an olefin with carbon monoxide and hydrogen in the presence of a rhodium catalyst at an elevated temperature and pressure followed by distillative separation of the non-converted feedstocks and low boiling components of the reaction mixture, the improvement residing in employing a carbon monoxide/hydrogen mixture containing 2-20 ppm sulfur and recycling residual rhodium compounds, both dissolved and suspended in the distillation residue, to the reaction zone.

Process for the manufacture of aldehydes

An improvement in a process for the manufacture of 2-ethylhexanol wherein n-butyraldehyde is subjected to aldol condensation, the resultant aldol condensation product is catalytically hydrogenated in a hydrogenation stage and the hydrogenation product is subjected to two separate multiple stage distillations to separate, in the first case the first runnings, a fraction containing the main amount of 2-ethylhexanol, and the residue. In the second case this residue is separated into a 2-ethylhexanol fraction and a distillation residue, the improvement residing in cracking the distillation residue by heating the same at 200 to 250.degree. C whereby to obtain cracked products comprising n-butanal, 2-ethylhexenal, 2-ethylhexanal, and/or 2-ethylhexanol together with non-cracked higher boiling substances. The cracked products are separated from the non-cracked products and the cracked products are recycled to the hydrogenation stage.

Process for the improved manufacture of 2-ethylhexanol

Divalent alcohols are produced by catalytic hydrogenation of a mixture comprising 20 to 40% of the corresponding hydroxyaldehyde and an organic compound. The organic compound is a solvent for and has a lower boiling point than the divalent alcohol.

Process for the production of divalent alcohols

A process for the isolation of n-aldehyde from a mixture of n-aldehyde and i-aldehyde in a solvent by the addition of no more than a stoichiometric amount of an alkali metal hydrogen sulfite in aqueous solution to the mixture. The resulting precipitate is separated, washed, and later decomposed to yield substantially pure n-aldehyde.

Method for the preparation of pure n-aldehydes

A process for the production of primary amines which comprises reacting compounds containing carbonyl groups with ammonia at a specific temperature, separating the water formed therefrom and hydrogenating the resulting product under pressure.

Process for the production of primary amines

Isobutyraldehyde is cleaved to form propylene, carbon monoxide and hydrogen over a supported rhodium and/or platinum catalyst at a temperature of 200.degree. to 400.degree. C and a pressure of 0.1 to 20 atmospheres. Preferably the isobutyraldehyde is obtained from the oxo synthesis of n-butyraldehyde from propylene and the gases resulting from the cleavage are returned to the oxo synthesis step.

Catalytic cleavage of isobutyraldehyde

A process for the separation of cobalt from the primary products of the Oxo-synthesis, which products contain dissolved cobalt-carbonyl compounds, which comprises adjusting the sulfur content of the primary products so that the sulfur content is at least 15 mg/kg of primary product and subjecting the primary products containing sulfur in at least said amount to a steam treatment and separating precipitated cobalt therefrom.

Process for the separation of cobalt from primary products of the

Alcohols are recovered from the ester-containing by-product from an oxo-synthesis, especially from the hydroformylation of propylene, by hydrolytically converting said by-product in the presence of water and a high surface area solid, such as an alumina at 250.degree. to 350.degree.C, and separating the alcohol from the material so converted. The converted product is preferably first hydrogenated prior to recovering the alcohol.

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Oberhausen-Sterkrade-Nord, undefined

Hans Tummes