Basf Aktiengesellschaft

Basf Se Corporation

Gunter Georgi

Ulrich Penzel

Eckhard Stroefer

Ekkehard Schwab

Peter Zehner

Oliver Bey

Gerhard Schulz

Wolfgang Mackenroth

Carsten Knoesche

Stefan Maixner

Hans-Juergen Pallasch

Hans Volkmar Schwarz

Martin Sohn

Heinrich-Josef Blankertz

Dominic Vanoppen

Matthias Kloetzer

Volker Krase

Michael Sander

Bernd Weidner

Dietrich Tittelbach-Helmrich

Joern Mueller

Jörn Müller

Juergen Dahlhaus

Gerald Molz

Klaus Werner

Dietmar Peisker

Andreas Warzecha

Holger Braunsberg

The invention relates to a multistage process for the continuous preparation of organic, distillable isocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic amines with urea and alcohols to liberate ammonia and form low molecular weight monomeric urethanes and thermal dissociation of the latter, in which by-products formed are at least partly utilized.

Method for producing isocyanates

A catalyst comprising nickel on a TiOsupport is obtainable by coprecipitation of It is used, in particular, for the hydrogenation of nitroaromatic compounds.

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The invention relates to a process for distillatively preparing TDA from a reactant stream comprising TDA, high boilers and low boilers in a dividing wall column in which a dividing wall is disposed in the longitudinal direction of the column to form an upper combined column region (), a lower combined column region (), a feed section () having a rectifying section () and stripping section (), and also a withdrawal section () having a rectifying section () and stripping section (), which comprises the following steps:

Method for the distillative recovery of toluylenediamine

Liquid organic compounds are hydrogenated by a process in which the hydrogen present in the reactor contains proportions of at least one gas which is inert in the hydrogenation reaction.

Method for hydrogenating liquid organic compounds

In a process for preparing amines, in which at least one compound containing at least one nitro group is reacted with hydrogen in the presence of a supported catalyst comprising, as catalytically active metal, nickel, if desired together with at least one metal of transition group I, V, VI and/or VIII, the reduced and stabilized supported catalyst comprises nickel crystallites having a bimodal nickel crystallite size distribution having maxima at 30-80 Angstrom and 81-150 Angstrom on a support comprising ZrO.sub.2, ZrO.sub.2 --HfO.sub.2 and/or SiO.sub.2 --ZrO.sub.2 and/or SiO.sub.2 --ZrO.sub.2 --HfO.sub.2 and in the reduced and passivated state has a nickel content of 60-80 percent by mass, an SiO.sub.2 content of 0-20 percent by mass, a ZrO.sub.2 content of 0-40 percent by mass, an HfO.sub.2 content of 0-4 percent by mass and after further reduction for one hour at 100.degree. C. has a degree of reduction of at least 70%.

Preparation of amines

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Lauchhammer, Germany

Gunter Georgi