Basf Aktiengesellschaft

Hans Leitner

Jost H Manegold

Wolfgang Hoelderich

Toni Dockner

Otto-Alfred Grosskinsky

Manfred Sauerwald

Peter Magnussen

Norbert Petri

Hubert Lendle

Johannes Hein

Wolfgang Leitenberger

Aliphatic dinitriles are prepared by reacting aliphatic dicarboxylic acids with ammonia in excess at from 200.degree. to 500.degree. C. in the presence of zeolites as catalysts.

Preparation of aliphatic dinitriles

Adipodinitrile is prepared by reacting adipic acid with excess ammonia at from 250.degree. to 350.degree. C. in the liquid phase in the presence of a diluent by a process in which a liquid hydrocarbon which is inert under the reaction conditions is used as the diluent.

Preparation of adipodinitrile

An improved process for producing adipic acid from the acidic wash waters which arise in the process for oxidizing cyclohexane with air, by treatment with nitric acid at from 10.degree. to 50.degree. C., with removal of the heat of reaction by external cooling, wherein the reaction mixture is led, at a flow velocity of at least 2.0 m/sec, as a thin layer spirally in counter-current to the coolant, under conditions which do not perturb the flow of the reaction mixture.

Production of adipic acid from acidic wash waters

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Frankenthal, Germany

Hans Leitner