Basf Aktiengesellschaft

Basf Se Corporation

Rolf Wambsganβ

Manfred Julius

Randolf Hugo

Thomas Preiss

Theodor Weber

Frank Poplow

Kirsten Wenz

Sabine Jourdan

Karl-Heinz Roβ

Werner Reutemann

The invention relates to a process for preparing methylamines by gas-phase reaction of methanol and ammonia as starting materials at a pressure in the range from 15 to 30 bar in the presence of heterogeneous catalyst. The starting materials are vaporized in one or more heat exchangers (), superheated to produce a feed gas stream and subsequently fed into a reactor (), with the mixing of the starting materials being able to be carried out in the feed stream to one of the heat exchangers () or at any desired position in a heat exchanger (). A product gas stream comprising monomethylamine, dimethylamine and trimethylamine and also reaction by-products is taken off from the reactor (). To control the reactor inlet temperature of the starting materials to a temperature in the range from 360&#xb0; C. to 370&#xb0; C., all or some of the feed gas stream or the product gas stream is passed through an adjustable valve () in order to vary the pressure and thus the condensation temperature.

Method for controlling the reactor admission temperature during the production of methylamine

A process for preparing xylylenediamine by continuously hydrogenating liquid phthalonitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, which comprises mixing a stream of a phthalonitrile melt in liquid form by means of a mixer unit with a stream of liquid ammonia and conducting the liquid mixture into the hydrogenation reactor.

Method for the production of diaminoxylene by continuous hydrogenation of liquid phthalonitrile

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Landau, Germany

Rolf Wambsganβ