Ruhrchemie Aktiengesellschaft

Hans Feichtinger

Hans-Walter Birnkraut

Boy Cornils

Wolfgang Payer

Siegfried Lutze

Werner Kluy

Jurgen Weber

Jurgen Falbe

Helmut Springer

Hans Tummes

Herbert Gothel

Dieter Schnier

Willi Nollen

Heinz Aschmann

Ludwig Brinkmann

Werner Pluta

An improvement in a process for the manufacture of .beta.-(dimethylamino)-propionitrile by contacting acrylonitrile with dimethylamine, the improvement residing in passing the reactants in countercurrent with respect to one another in a bubble column reactor and reacting them therein at a temperature between 25.degree. and 80.degree. C., preferably 40.degree. to 60.degree. C.

Process for the manufacture of .beta.-(dimethylamino)-propionitrile

A phenol/formaldehyde condensation product of a 4,4'-thio-bis-(dialkylphenol) and formaldehyde having a molecular weight of 1,000 to 4,000; a process for preparing such a condensation product by contacting 4,4'-thio-bis-(dialkylphenol) and a source of formaldehyde in the presence of a protonic acid catalyst; and the use of such a condensation product as an antioxidant in an olefin polymer or copolymer composition.

4,4-Thio-bis-(dialkylphenol)/formaldehyde condensates

A continuous process for the manufacture of .alpha.-cyano-ethylated aliphatic aldehydes by continuously passing acrylonitrile and aldehyde through a tubular reaction zone and therein contacting the same with an alkali hydroxide at a temperature between 20.degree. and 120.degree. C, the contact of the acrylonitrile and aldehyde with the alkali hydroxide being for a brief period of time and thereafter immediately separating the reaction product from the alkali hydroxide. Unreacted acrylonitrile and aldehyde can be recycled to the tubular reactor and additional alkali hydroxide can be added to make up for any losses.

Process for the continuous manufacture of .alpha.-cyano-ethylated

A process is described whereby corrosive, halogen-containing compounds are removed from polyolefins. Briefly, the process comprises mixing the polyolefin with water in a purification zone, treating at least part of the water with an ion exchanger and returning the treated water to the purification zone.

Process for the purification of low pressure polymerized polyolefin

A method for preparing neopentane diamine is disclosed comprising reacting neopentane glycol with ammonia in the presence of hydrogen and a nickel containing catalyst at elevated temperatures and pressures. Neopentane diamine is useful as an intermediate in the preparation of polyurethanes.

Method for the preparation of 1,3-diamino-2,2-dimethyl propane

4,4'-Thio-bis-(dialkylphenol)/formaldehyde condensates and process for

A process for the manufacture of bis-(2-cyanoethyl)-amine wherein gaseous ammonia is reacted with acrylonitrile having a 5-15% by weight water content in a bubble column reactor. The reaction is carried out at a temperature of about 20.degree.-80.degree. C.

Process for the manufacture of bis-(2-cyanoethyl)-amine

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

An olefin polymerization catalyst comprising a chromium compound deposited on a carrier, which chromium compound is complexed with a straight-chain, branched-chain, or cyclic aliphatic hydrocarbon or mixture thereof such that the mol ratio of aliphatic hydrocarbon to chromium compound is 1:2-3, said chromium compound being deposited on said carrier material in an amount between 10.sup..sup.-3 and 10 millimols chromium compound per gram of carrier material, said carrier material also containing a trialkyl, tricycloalkyl, triaryl, monohalodihydrocarbyl, or monoalkoxydihydrocarbyl aluminum compound; a process for preparing such an olefin polymerization catalyst and the use of such catalyst in the polymerization of olefins, particularly ethylene, propylene, 2-methylpropylene and butene-1.

Chromium-containing catalyst systems and their use for the

An azomethine is produced by reacting a saturated or unsaturated aliphatic, cycloaliphatic, aromatic or heterocyclic aldehyde with ammonia and hydrogen in the presence of a catalyst containing at least one group VIII B metal at a temperature of 20.degree. to 200.degree. C. Preferably, the catalyst also contains at least one group VI B metal.

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Dinslaken, Germany

Hans Feichtinger