Basf Aktiengesellschaft

Dieter St&uuml;tzer

Peter Zehner

J&ouml;rn M&uuml;ller

Ekkehard Schwab

Georg Heinrich Grosch

Stephan Bauer

Thomas Ostrowski

Ulrich Penzel

Kathrin Harre

Hans Volkmar Schwarz

Dominic Vanoppen

Eckhard Str&ouml;fer

J&uuml;rgen Winkler

Michael Sander

Ralf B&ouml;hling

Markus Maurer

Polyetherpolyols are prepared by reacting diols or polyols with ethylene oxide, propylene oxide, butylene oxide or a mixture thereof in the presence of a multimetal cyanide complex catalyst by a process which is carried out in a vertical upright cylindrical reactor comprising a jet nozzle which is arranged in the upper reactor region and is directed downward and via which the starting materials and the reaction mixture are fed in, and comprising a take-off, preferably in the lower reactor region, via which the reaction mixture is fed back to the jet nozzle in an external circulation by means of a pump via an equilibration container, comprising a concentric guide tube which extends over the total length of the reactor, except for the reactor ends, and comprising a heat exchanger integrated in the annular space.

Method for producing polyetherpolyols in the presence of a multi-metal cyanide complex catalyst

The invention relates to a process for the preparation of amines by hydrogenation of nitro compounds, which comprises carrying out the hydrogenation in a vertical reactor whose length is greater than its diameter, having a downward-facing jet nozzle arranged in the upper region of the reactor through which the starting materials and the reaction mixture are fed in, and having an outlet at any desired point of the reactor, through which the reaction mixture is fed back to the jet nozzle in an external circuit by means of a conveying means, and having flow reversal in the lower region of the reactor.

Method for producing amines

Growing community of inventors

Dudenhofen, Germany

Dieter Stützer

Growing community of inventors

Dudenhofen, Germany

Dieter St&uuml;tzer

Dieter Stützer