Hoechst Aktiengesellschaft

Celanese Gmbh

Celanese Chemicals Europe Gmbh

Ruhrchemie Aktiengesellschaft

Oxea Corporation

Wolfgang Zgorzelski

Carl Dieter Frohning

Wilhelm Gick

Peter Lappe

Ernst Wiebus

Kurt Schalapski

Wolfgang Greb

Heinz Kalbfell

Hans Liebern

Helmut Bahrmann

Boy Cornils

Hanswilhelm Bach

Gerhardt Horn

Rainer Lukas

Jörg Arnold

Klaus Bergrath

Harald Kappesser

Michael Riedel

Wolfgang Hofs

Richard Fischer

Klaus Schmid

Gunther Kessen

Dieter Frohning

Joseph Hibbel

Mark Hewlett

Thomas Klein

Hans-Willi Bohnen

Norbert Schopper

Klaus Denkmann

Mariola R&ouml;tzheim

Andreas Fischbach

Mariola Rotzheim

Michael Messerschmidt

Wilhelm Glick

Norbert SCHÖPPER

Barbara Berghahn

Gregor Konietzny

The invention relates to a method for reprocessing a liquid product of a hydroformylation reaction, wherein the liquid phase produced in a release stage is supplied to a separating device from which a liquid flow containing rhodium is guided away via a filter, where solids thereby separated are taken out of the process and the filtrate obtained is guided back into the hydroformylation reaction.

Method for reprocessing a liquid hydroformylation product

The present invention relates to a process for producing aliphatic C-C-alcohols, in particular 2-ethylhexanol, from high boilers by thermal treatment in the presence of an alkali metal compound and subsequent hydrogenation of the volatile products.

Process for producing aliphatic C3-C10-alcohols from high boilers

The invention relates to a method for separating and recovering rhodium from reaction products of oxosynthesis, especially reaction products containing cobalt. The invention also relates to the reuse of rhodium as a catalyst for hydroformulation and to a catalyst for hydroformulation itself. The inventive method is characterized by the following: extraction of the organic solution with an aqueous phosphate solution or a phosphate solution, water washing, oxidative treatment of the organic phase, and extraction of the organic phase with an aqueous water-soluble arylphosphine solution.

Method for recovering rhodium from reaction products of oxosynthesis

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

A process for cleaning up the wastewaters which originate from the preparation of alcohols. The alcohol preparation includes an aldolization reaction followed by hydrogenation and then alcohol distillation. The resulting wastewaters include 3 wastewater fractions from respective steps in the alcohol preparation. The process for cleaning up these wastewaters include the steps of (a) combining two of the three fractions and adjusting the pH of the combination, (b) bringing at least one of the fractions into contact with a coalescing filter, and (c) extracting a mixture of all three fractions.

Process for cleaning up wastewaters from the preparation of alcohols

A method of stabilizing aliphatic C.sub.3 -C.sub.14 -aldehydes against polymerization and autocondensation by the addition of alkaline substances to the aldehydes wherein the alkaline substances used are alkali metal hydroxides, alkaline earth metal hydroxides, alkali metal carbonates, alkaline earth metal carbonates or alkali metal carboxylates which are added to the aldehyde to be stabilized in amounts of 0.05-20 ppm, based on the aldehyde.

Method of stabilizing aldehydes

Process for the distillation of alcohols

In a process for preparing alcohols comprising the hydrogenation of aldehydes in the presence of a hydrogenation catalyst in the gas phase, the improvement comprising adding nitrogen-containing bases to the aldehyde to be hydrogenated, whereby the formation of by-products is largely suppressed and isolation of the desired alcohols in high selectivity and correspondingly high yield is made possible.

Process for preparing alcohols

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

A process for the preparation of alcohols by reaction of organic carbonyl compounds with hydrogen in two stages at elevated temperature and, optionally, elevated pressure. In the first stage, hydrogen and the carbonyl compounds are fed as a gas to a copper-containing catalyst and reacted to 80 to 99.5 percent of the theoretical conversion. In the second stage, the reaction product of the first stage is fed to a nickel/alumina/zirconium dioxide catalyst as a liquid, along with hydrogen. The carbonyl compounds used include aldehydes and their derivatives and, in particular, aliphatic unsaturated and saturated aldehydes.

Process for the preparation of alcohols in two stages

A process for the production of 2-ethyl-hexanol comprising reacting propene with carbon monoxide and hydrogen, in the presence of an aqueous catalyst containing rhodium and at least one sulfonated triarylphosphine, to form an aqueous phase and an organic phase, said organic phase comprising a mixture of materials having boiling points lower than that of n-butanal and substances having boiling points equal to or higher than that of n-butanal, said materials including i-butanal, separating said material from said substances, subjecting said substances to aldol condensation, in the presence of aqueous alkali, to form 2-ethyl hexenal, first hydrogenating said 2-ethyl-hexenal in a gas phase in the presence of a first hydrogenation catalyst and thereafter hydrogenating said 2-ethyl-hexenal in a liquid phase to form 2-ethyl-hexanol in the presence of a second hydrogenation catalyst.

Process for the production of 2-ethyl-hexanol

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Oberhausen, Germany

Wolfgang Zgorzelski