Bayer Aktiengesellschaft

Hein Quast

Otto Immel

Hans-Helmut Schwarz

Eberhard Bandtel

Hans-Michael Fischler

Dieter Bauer

Trimethylolpropane is prepared in such a manner that butyraldehyde is metered into a mixture of water, alkaline condensing agent and formaldehyde, which contains less than 0.1 mol of methanol relative to 1 mol of formaldehyde, at temperatures from 15.degree. to 50.degree. C., and after addition of the butyraldehyde the reaction mixture is heated up to 90.degree. C., sufficient water being present in the reaction mixture so that the reaction mixture has a content of trimethylolpropane of 5 to 25% by weight after the reaction.

Process for the preparation of trimethylolpropane

A process for the preparation of 2,2-dimethylolalkanals is disclosed wherein formaldehyde is reacted with an aldehyde of the formula

Process for the preparation of 2,2-dimethylolalkanals

Diphenylamine is made by heating aniline under pressure and temperatures of 250.degree.-400.degree. C in the presence of a boron/fluorine compound and water.

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Krefeld, Germany

Hein Quast