Hoechst Aktiengesellschaft

Ruhrchemie Aktiengesellschaft

Heinz Kalbfell

Peter Lappe

Ernst Wiebus

Helmut Bahrmann

Helmut Springer

Carl Dieter Frohning

Wolfgang Greb

Wolfgang Zgorzelski

Bernhard Lieder

Wolfgang Hofs

Harald Kappesser

Boy Cornils

Jurgen Weber

Hanswilhelm Bach

Werner Konkol

Peter Heymanns

Kurt Schalapski

Wilhelm Gick

Josef Hibbel

Franz Thonnessen

Georg Dambkes

Norbert Breitkopf

Dieter Frohning

Gunther Kessen

Herbert Mercamp

Klaus Denkmann

Eberhard Von Mulmann

Mariola R&ouml;tzheim

Wastewater from the aldolization reaction is purified by adjusting its pH to 0 to 6, followed by extraction with monohydric alcohols having at least 8 carbon atoms, hydrocarbons having at least 6 carbon atoms, and mixtures thereof. In some cases, adjustment of the pH causes the formation of an organic phase, which is separated from the remaining wastewater before extraction.

Process for the purification of wastewater from the aldolization reaction

Waste gas obtained in the hydroformylation of olefinically unsaturated compounds in the presence of an aqueous catalyst solution comprising water-soluble rhodium complexes (1st reaction stage) is fed to a homogeneous reaction system in which residual amounts of the olefinically unsaturated compounds from the first reaction stage are reacted in a homogeneous reaction system (2nd reaction stage).

Process for the hydroformylation of olefinically unsaturated compounds

Isomeric mixtures of pentanoic acids are prepared by subjecting butene-1/butene-2 mixtures to hydroformylation to form aldehyde mixtures, followed by oxidation of the aldehyde mixtures which have been separated off from the reaction product. The hydroformylation is carried out in a heterogeneous system in the presence of rhodium catalysts which are dissolved in water. The mixture of isomeric 5 carbon monocarboxylic acids produced, when esterified with polyhydric alcohols, yields mixtures of isomeric esters which are useful as lubricants for refrigerant compressors operated with chlorine-free, at least partly fluorinated hydrocarbons as the refrigerant.

Mixtures of isomeric pentanoic acids, esters prepared therefrom, and

Preparation of 2,2-dimethylpropanediol-1,3 by the aldol addition of isobutyraldehyde and formaldehyde using tri-n-propylamine as a catalyst, followed by hydrogenation of the reaction mixture, and subsequent distillation of the hydrogenation product in the presence of isobutanol and water.

Process for the preparation of 2,2-dimethylpropanediol-1,3

The preparation of aldehydes by the reaction of olefins with carbon monoxide and hydrogen in the presence of water and water-soluble rhodium/phosphine complex compounds as catalysts. The method comprises first cooling the organic part of the liquid phase to 70.degree. to 90.degree. C. in a stripping column by treatment with the carbon monoxide/hydrogen mixture fed into the reactor, further cooling the organic part to 20.degree. to 40.degree. C. by heat exchange with the feed olefin, subsequently relieving the pressure with the consequent formation of waste gas and aqueous and organic phases, and finally separating the phases so as to recover substantially all of the catalyst and the heat of reaction.

Process for the preparation of aldehydes

A process for the hydroformylation of olefins having 2 to 5 carbon atoms using rhodium catalysts in a low pressure process, wherein the waste gas from the low pressure plant containing the olefin is compressed and used in a high pressure plant.

Process for the hydroformylation of olefins

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Schermbeck, Germany

Heinz Kalbfell