Hoechst Aktiengesellschaft

Ruhrchemie Aktiengesellschaft

Ruhrechemie Aktiengesellschaft

Georg Dambkes

Hanswilhelm Bach

Helmut Bahrmann

Ernst Wiebus

Peter Lappe

Helmut Springer

Werner Konkol

Wolfgang Greb

Wilhelm Gick

Franz Thonnessen

Boy Cornils

Jurgen Weber

Peter Heymanns

Carl Dieter Frohning

Rainer Lukas

Heinz Kalbfell

Harald Kappesser

Klaus Mathieu

Norbert Breitkopf

Eberhard Von Mulmann

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

A process for the preparation of 2,2-dimethylpropane-1,3-diol by an addition reaction between isobutyraldehyde and formaldehyde in the presence of tertiary amines as the catalyst, hydrogenation of the reaction mixture, and subsequent distillation. Before the distillation, formaldehyde is added to the hydrogenation product to remove unwanted basic impurities.

Process for the preparation of 2,2-dimethylpropane-1,3-diol

This invention relates to a process for preparing 3(4),8(9)-bis(aminomethyl)tricyclo[5.2.1.0.sup.2,6 ]decane. The starting material for the synthesis of this compound is dicyclopentadiene, which is hydroformylated in the presence of a rhodium compound and subjected to reductive amination without the hydroformylation catalyst being separated from the reaction mixture.

Process for preparing 3(4),8(9)-bis(aminomethyl)-tricyclo[5.2.1.0.sup.2,6 ]

A process for the purification of propanediol-1,3, especially when produced by hydration of acrolein with water, including extracting the diol with cyclohexane. Preferably, from 2 to 10 parts by weight of cyclohexane per part by weight of diol is used. The purification is usually carried out below 60.degree. C.

Process for purifying propanediol-1,3

A process for the purification of a gas containing one or more of hydrogen sulfide, hydrogen cyanide, and carbonyl sulfide as impurities comprising contacting the gas with at least one aliphatic aldehyde which is liquid under the purification conditions. The gas is inert to the aldehyde under such conditions. The process is useful in the purification of synthesis gas for use in reactions wherein sensitive catalysts are employed.

Process for purification of gases

A process for the hydroformylation of aldehydes comprising reacting aliphatic olefins with carbon monoxide and hydrogen in a liquid phase in the presence of water, a rhodium catalyst and a water soluble salt of a sulfonated or carboxylated triarylphosphine, the reaction taking place in the presence of an aqueous phase having a pH of about 5.5 to about 6.2.

Process for preparing aldehydes

Growing community of inventors

Dinslaken, Germany

Georg Dambkes