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Stefan Maixner

Johann-Peter Melder

Hermann Luyken

Rolf-Hartmuth Fischer

Andreas Ansmann

Peter Bassler

Christoph Benisch

Frank Ohlbach

Eckhard Stroefer

Torsten Mattke

Kai Thiele

Wolfgang Mackenroth

Peter Baβler

Matthias Hinrichs

Jochem Henkelmann

Stephan Andreas Schunk

Ulrich Penzel

Ralf Boehling

Filip Nevejans

Manfred Heilig

Georg Krug

Juergen Bechtel

Michaela Fenyn

Sven Titlbach

Imke Britta Mueller

Andreas Kuschel

Sven Kueber

Werner Bolz

Thomas Schulz

Carlos Lizandara

Joerg Rother

Mohamed Halabi

Nedko Stefanov Drebov

Ekkehard Schwab

Hartwig Voss

Carsten Knoesche

Samuel Neto

Hans-Juergen Pallasch

Andreas Wölfert

Martin Sohn

Hans Volkmar Schwarz

Jan Pablo Josch

Joana Coelho Tsou

Helmut Winterling

Steffen Oehlenschlaeger

Tsung-Chieh Cheng

Johannes Jacobs

Gunter Georgi

Kerstin Heinen

Jens Ferbitz

Myung Un Won

Sven Boehmeke

Frederik Van Laar

Gerald Molz

Christian Tragut

Hartwig Voß

Steffen Oehlenschläger

Ralf BÖHLING

Peter Basler

Sven Küber

Sven Böhmeke

The invention relates to a process for producing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, comprising: (a) mixing an amine comprising feed stream, a phosgene comprising feed stream and optionally an inert solvent; (b) reacting the amine with phosgene in a first reaction section to obtain an intermediate reaction mixture comprising isocyanate, carbamoyl chlorides, amine hydrochlorides and unreacted phosgene; (c) cleaving the carbamoyl chlorides and remove phosgene from the intermediate reaction mixture in a second reaction section to obtain an isocyanate comprising crude product, (d) optionally working-up the crude product; wherein reacting (b) is carried out such that the intermediate reaction mixture comprises 1.7 to 5 mol-% solid amine hydrochlorides based on the molar amount of amine fed into the process.

Process for producing isocyanates

A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula ABwherein:

Heterogeneous catalysts for the direct carbonylation of nitro aromatic compounds to isocyanates

A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula ABwherein: A is one or more element selected from Ni, Ru, Rh, Pd, Ir, Pt and Ag, B is one or more element selected from Sn, Sb, Pb, Zn, Ga, In, Ge and As, x is in the range 0.1-10, y in is in the range 0.1-10.

The invention relates to a process for preparing isocyanates by reacting primary amines with phosgene in a solvent, where the solvent comprises a dialkyl carbonate.

Process for preparing isocyanates in dialkyl carbonates as solvent

The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, if appropriate in the presence of at least one inert medium, in which the amine and the phosgene are first mixed in a mixing chamber () to give a reaction mixture and the reaction mixture is fed to a reactor, the amine being added through an orifice () arranged coaxially to the mixing chamber () and the phosgene being added through feed orifices () in at least two planes () arranged at right angles to the axis () of the mixing chamber (), or the phosgene being added through the orifice () arranged coaxially to the mixing chamber and the amine through the feed orifices () in at least two planes () arranged at right angles to the axis () of the mixing chamber (). At least one plane () is arranged upstream and at least one plane () downstream of the orifice () arranged coaxially to the mixing chamber () in main flow direction of the reaction mixture. The mean residence time of the reaction mixture in the mixing chamber () is not more than 20 ms.

Process for preparing aromatic isocyanates

Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel.

Process for preparing isocyanates

A process for preparing tolylenediamine by hydrogenating dinitrotoluene with hydrogen in the presence of a suspended catalyst

Method for producing toluylenediamine by hydrogenating dinitrotoluene

The iron-containing catalyst suitable for use as a catalyst contains a) iron or a mixture containing iron and an iron-based compound. The iron has an average crystallite size ranging from 1-35 nm measured by X-ray diffraction.

Iron-containing material suitable for use as hydrogenation catalyst

The disclosure relates to a process for purifying crude caprolactam. The process involves converting a first mixture of 6-amino capronitrile and water to a second mixture of caprolactam ammonia, water, high boilers and low boilers using a catalyst. The ammonia is removed from the second mixture to obtain a third mixture. Water is removed from the third mixture to give crude caprolactam, high boiler and low boilers. Purified caprolactam is then obtained by a series of distillation steps.

Method for purifying caprolactam

A process for reducing the level of an aliphatic monounsaturated amine (IV) in a mixture (V) containing an aminonitrile (I) or a diamine (II) or a dinitrile (III) or mixtures thereof as well as said mine (IV) by

Method for reducing the content of an unsaturated amine in a mixture containing an amino nitrile, a diamine, a dinitrile or mixtures thereof

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

A process for removing high boilers from crude caprolactam which comprises high boilers, caprolactam and in some cases low boilers, and which has been obtained by

Purification of caprolactam

An oxidic composition which is suitable as a catalyst having divalent and trivalent iron in an atomic ratio of divalent to trivalent iron in the range from greater than 0.5 to 5.5 and oxygen as a counterion to the divalent and trivalent iron. The catalyst composition is useful in the hydrogenation of nitriles to amines.

Iron-containing oxidic material suitable for use as hydrogenation catalyst precursor

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Schwetzingen, Germany

Stefan Maixner