Basf Aktiengesellschaft

Gerhard Frank

Gerald Neubauer

Hans J Wilfinger

Paul Duffner

Peter Rudolf

Manfred Ohlinger

Emil Pfannebecker

Stefan Karbach

Peter Stops

Guenter Herrmann

Gert Buerger

Ruediger Schmitz

Hubert Lendle

Wilfried Seyfert

Jost H Manegold

A process for working up mother liquors resulting from the preparation of adipic acid by oxidation of cyclohexanol or cyclohexanone or mixtures thereof with nitric acid entails removal of nitric acid by azeotropic distillation with water, heating the resulting melt at from 130.degree. to 180.degree. C. and then dissolving it in water, treating the aqueous solution with cation exchangers, subsequently again evaporating off the water and heating the resulting dicarboxylic acid melt at from 200.degree. to 240.degree. C. and then obtaining a mixture of dicarboxylic acids by distillation.

Workup of mother liquors resulting from the preparation of adipic acid

Carboxylic esters obtained by reacting olefinically unsaturated compounds with carbon monoxide and alcohols and containing aldehydes, acetals and/or unsaturated compounds are purified by

Purification of carboxylic esters which contain aldehydes, acetals

5-Membered, 6-membered or 7-membered cyclic imines are prepared by hydrogenating a C.sub.2 -C.sub.4 -alkanedinitrile in the liquid phase, at from 180.degree. to 300.degree. C. and under superatmospheric pressure, in the presence of a catalyst, by a process in which an iron catalyst obtained by reduction of an iron oxide with hydrogen at .ltoreq.500.degree. C. is used.

Preparation of 3-methylpiperidine

Molded catalyst materials contain metallic cobalt and/or nickel particles and a lubricant, the said particles being obtained by reduction of cobalt oxide and/or nickel oxide particles containing less than 0.1% by weight of alkali metal oxides and/or alkaline earth metal oxides at .ltoreq.500.degree. C., and the molded catalyst material having an indentation hardness greater than 300 kp/cm.sup.2.

Molded catalyst materials containing reduced cobalt and/or nickel

A molded iron catalyst material which has an indentation hardness of from 850 to 1500 kp/cm.sup.2 and contains metallic iron particles, obtained from iron oxide particles by contact with hydrogen at less than 500.degree. C., and a lubricant, its preparation and its use.

Molded iron catalyst material and its preparation

Molded iron catalysts which contain metallic iron particles, obtained from anisometric iron oxide particles by contact with hydrogen at .ltoreq.500.degree. C., and a lubricant, are prepared.

Molded iron catalyst and its preparation

Saturated primary amines are prepared by reacting a nitrile with hydrogen at elevated temperature under superatmospheric pressure in the presence of ammonia and a metallic iron catalyst which has been obtained by reducing anisometric iron oxide particles with hydrogen at not more than 500.degree. C.

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Hirschberg, Germany

Gerhard Frank