Bayer Aktiengesellschaft

Wilfried Kohler

Horst Behre

Nikolaus Muller

Peter Schnegg

Dietmar Mayer

Manfred Blazejak

Eike Gabel

Horst-Dieter Kramer

Heinz U Blnak

Karl-Johann Wemmje

A new process for the preparation of mono-N-.beta.-cyanoethylanilines, characterized in that a substituted or unsubstituted aniline compound is reacted with acrylonitrile in the presence of active bleaching earth as catalyst at a temperature of between 80.degree. and 200.degree. C. in a nonaqueous reaction medium.

Process for the preparation of mono-N-.beta.-cyanoethylanilines

A new process for the preparation of aromatic sulphonic acids, in which the sulphonation of the aromatic compounds is carried out with sulphur trioxide in organic solvents in the presence of hydrogen halide.

Process for the sulphonation of aromatic compounds with sulphur trioxide

Hydroxydiphenyls can be prepared by reacting diphenylsulphonic acids or their alkali metal salts with an alkali metal hydroxide at elevated temperature and elevated pressure, in the presence of water. For this purpose, the diphenylsulphonic acids or their alkali metal salts are reacted, at a temperature between 280.degree. and 330.degree. C. and a pressure of up to 120 bar, with an amount of aqueous alkali metal hydroxide having a concentration of at least 50% by weight, such that, after all acidic groups have been neutralized, 3 to 25 mols of alkali metal hydroxide per equivalent of sulphonate group are present in the reaction mixture. Mineral acids are added to the alkaline reaction mixture, after it has been cooled and diluted with water, until the pH value is less than 8, and the precipitated hydroxydiphenyl is isolated at a temperature from -5.degree. C. to +100.degree. C.

Process for the preparation of alkali metal diphenylates and free

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Cologne, Germany

Wilfried Kohler