Basf Se Corporation

Basf Aktiengesellschaft

Kai Thiele

Eckhard Stroefer

Heiner Schelling

Torsten Mattke

Ulrich Penzel

Stefan Maixner

Michael Bock

Matthias Eiermann

Jon S Speier

Michael Zoellinger

Johannes Jacobs

Rolf Pinkos

Gerhard Olbert

Filip Nevejans

Manfred Heilig

Daniel Breuninger

Peter Van Den Abeel

Ulrich Steinbrenner

Edward Michael Dexheimer

Thomas Ostrowski

Wolfgang Mackenroth

Andreas Wölfert

Hans-Juergen Pallasch

Martin Sohn

Jan Pablo Josch

Kerstin Heinen

Helmut Moehwald

Filip Deberdt

Regina Hendreich

Tsung-Chieh Cheng

Andreas Weickgenannt

Matthias Hinrichs

Markus Kraemer

Viktor Ladnak

Silvia Tauro

Thomas Schulz

Anne-Kathrin Merten

Byoung-Yeon Kim

Wouter Ducheyne

Jens Ferbitz

Jan D Jacobs

Johannes Adam

Robert Reinhardt

Thomas A Grzanka

Koenraad Vandewalle

Christoph Schnorpfeil

Alexander Duefert

Jochen Gauer

Veronika Quaschning

Paul Kierkus

Peter Groer

Klaus-Peter Metzner

William Portwood

Uwe Storck

Dave Beckwith

Dirk Hablawetz

Johnny Moors

Myung Un Won

Christian Tragut

Bart Janssen

Gabriele Murrer

Byoung Yeon Kim

Bart Jansen

Thomas Grzanka

Markus Krämer

The present invention relates to a process for preparing phosgene by reacting chlorine with carbon monoxide over an activated carbon catalyst, wherein the content of chlorine oxides in the chlorine feed stream is low, to an apparatus for preparation of phosgene and to the use of the phosgene prepared by the process of the invention.

Method for producing phosgene

A process for preparing an aromatic polyamine mixture including 4,4'-methylenedi(phenylamine) and higher homologues of MDA is provided. The process includes steps of (i) reaction of aniline with formaldehyde by means of an acid catalyst to form a crude product mixture (I), (ii) neutralization of the crude product mixture (I) and removal of the salts formed; (iii) isolation of aniline; (iv) distillation of the resulting crude product mixture so as to separate off (iv-1) a mixture (II) of MDA isomers (II-1) containing from 8 to 20% by weight of 4,4&#x2032;-methylenedi(phenylamine) and not more than 0.3% by weight of secondary components (II-2) and (iv-2) a low boiler mixture of at least 55% by weight of secondary components (II-2) and MDA isomers (II-1); and (v) recirculation of the mixture (II).

Process for preparing an aromatic polyamine mixture

The present invention relates to a process for hydrogenating a mixture (G1) in the presence of a catalyst, where the mixture (G1) comprises at least one colorless amine and at least one color-imparting component. As a result of the hydrogenation step, the at least one color-imparting component is firstly partially, preferably fully, hydrogenated, while the colorless amine, in particular aniline, is not hydrogenated or hydrogenated to only a very small extent. The color-imparting components which cause the discoloration of the amine which is itself in principle colorless are thus removed by hydrogenation, as a result of which purification of the colorless amine or the mixture (G1) is achieved.

Process for hydrogenating a mixture in the presence of a colorless amine

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 method of separating a phosgene- and hydrogen chloride-comprising stream (), wherein said method comprises conveying the hydrogen chloride- and phosgene-comprising stream () into a distillation column (), withdrawing at the bottom of the distillation column () a phosgene-comprising stream () and withdrawing at the top of the column an essentially hydrogen chloride-comprising stream (). At least a portion of the stream () withdrawn at the top is compressed and at least partially condensed and at least a portion of the liquid and compressed essentially hydrogen chloride-comprising stream is decompressed and recycled into the top of distillation column () as reflux.

Separation of a phosgene- and hydrogen chloride-comprising stream

The invention relates to a method for purifying mixtures comprising 4,4'-methylenediphenyl diisocyanate, which comprises purifying by distillation a mixture I comprising 4,4&#x2032;-methylenediphenyl diisocyanate having a hydrolyzable chlorine content as specified in ASTM D4663-10 of greater than 100 ppm by means of a column K, wherein the gaseous stream comprising the mixture I is brought into contact in the column Kwith at least one liquid compound A which has the same or higher boiling point than 4,4&#x2032;-methylenediphenyl diisocyanate and which has a hydrolyzable chlorine content as specified in ASTM D4663-10 of a maximum of 100 ppm, and wherein the gaseous stream O obtained at the top of the column comprises 4,4&#x2032;-methylenediphenyl diisocyanate has a hydrolyzable chlorine content as specified in ASTM D4663-10 of a maximum of 100 ppm.

Method for purifying mixtures comprising 4,4'-methylenediphenyl diisocyanate

A method of regulating the viscosity of a mixture containing at least two components having different viscosities, which includes the steps of:

Method of regulating the viscosity of a mixture comprising at least two components having different viscosities

A process for preparing phosgene by reaction of a feed stream () obtained by combining and mixing a chlorine feed stream () and a carbon monoxide feed stream (), with the carbon monoxide being introduced in a stoichiometric excess over chlorine, in catalyst tubes filled with beds of activated carbon in a reactor R having a bundle of catalyst tubes, to give a product gas mixture () which is separated into a liquid, phosgene-comprising product stream () and an offgas stream () comprising carbon monoxide which is discharged via a pressure-regulating valve, where the reaction of the feed stream () in the reactor R and the separation of the product gas mixture () are carried out under a pressure in the range fromtobar gauge pressure, wherein the excess of carbon monoxide in the feed stream () to the reactor R is regulated by continuously measuring the flow and the concentration of carbon monoxide in the offgas stream (), calculating the actual value of the excess of carbon monoxide in the feed stream () to the reactor R from these measurements in combination with the continuously measured values for the flow of the carbon monoxide feed stream () and the flow of and the chlorine concentration in the chlorine feed stream () and matching this to the intended value of the excess of carbon monoxide in the feed stream () to the reactor R by adapting the flow of the carbon monoxide feed stream (), is proposed.

The invention relates to a process for preparing methylenedi(phenyl isocyanate), which comprises (a) the phosgenation of two-ring and/or multiring methylenedi(phenylamine), (b) the fractionation of the crude methylenedi(phenyl isocyanate) obtained to give two-ring and multiring isomers, (c) the purification and/or fractionation of the resulting mixture of two-ring isomers of methylenedi(phenyl isocyanate) and (d) the storage of the mixtures obtained in step (c) or in step (b), wherein part of the stored mixtures is reused by means of recirculation in at least one of steps (b) or (c).

Process for preparing methylenedi(phenyl isocyanate)

The present invention relates to a process for preparing an isocyanate, comprising hydrogenating a mixture (Gi) comprising an amine in the presence of a hydrogenation catalyst comprising copper to obtain a mixture (Gii) comprising the amine, and reacting the mixture (Gii) with phosgene to obtain a mixture (Giii) comprising the isocyanate. The present invention further relates to the isocyanate preparable by this process.

Process for preparing an isocyanate

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

The present invention relates to a process for the production of isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), by reacting an amine with phosgene in the liquid phase or in the gas phase to form the corresponding isocyanates, subsequent removal of the solvent in at least two steps to obtain at least two solvent streams, individual treatment of the at least two solvent streams, and recirculation of at least a portion of the solvent streams.

Process for the production of isocyanates, preferably diisocyanates and polyisocyanates with solvent recirculation

The invention relates to a process for preparing methylenediphenyldiamine (MDA), comprising the following steps a) to c):

Process for preparing MDA via the stage of the aminal

The invention relates to a process for preparing methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is &#x3c;10 000 ppm, based on all compounds present in the process. The invention further relates to the phosgenation of MDA to methylenediphenyl diisocyanate (MDI).

Method for producing color-stable MDA and MDI

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Antwerp, Belgium

Kai Thiele