Basf Aktiengesellschaft

Basf Se Corporation

Hans-Juergen Pallasch

Eckhard Stroefer

Andreas Woelfert

Martin Sohn

Ulrich Penzel

Wolfgang Mackenroth

Filip Nevejans

Torsten Mattke

Filip Deberdt

Heiner Schelling

Carsten Knoesche

Heinrich-Josef Blankertz

Peter Van Den Abeel

Jan D Jacobs

Johann-Peter Melder

Stefan Maixner

Kai Thiele

Andreas Brodhagen

Christian Eidamshaus

Michael Bock

Martin Sesing

Markus Siegert

Hans Volkmar Schwarz

Manfred Heilig

Jon S Speier

Joerg Pastre

Stephan Scholl

Gunter Georgi

Byoung-Yeon Kim

Markus Maurer

Hans-Martin Polka

Tilmann Steinmetz

Markus Hiller

Rene Leuthold

Johnny Moors

Jan Peter Bredehoeft

Gerald Molz

A process for the continuous preparation of 1,2-propylenediamine (1,2-PDA) and dimethyldiethylenetriamine (DMDETA) via reaction of monoisopropanolamine (MIPOA) with ammonia in the presence of hydrogen and a supported heterogeneous hydrogenation catalyst (catalyst), wherein the reaction is effected in the liquid phase at an absolute pressure in the range from 60 to 170 bar.

Process for the continuous preparation of 1,2-propylene diamine (1,2-PDA) and dimethyldiethylene triamine (DMDETA)

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 At least a portion of the stream () withdrawn at the top is compressed and at least partially condensed and at least a portion of the liquid and compressed essentially hydrogen chloride-comprising stream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 present invention relates to a process for preparing isocyanates by reacting amines with phosgene in the liquid phase, where phosgene, hydrogen chloride and isocyanates are separated with stripping columns operated at different pressures.

Process for preparing isocyanates by phosgenation of amines in the liquid phase

The present invention accordingly provides a process for preparing light-colored polyphenylene-polymethylene polyisocyanates comprising the steps (a) providing an amount of chlorine, (b) separating the chlorine provided in the step (a) to obtain a first chlorine fraction having a content of free and bound bromine and iodine of &#x3c;50 ppm and a second chlorine fraction having an increased content of free and bound bromine and iodine that depends on the original amount of bromine and iodine in the chlorine provided in step (a) and the separation split, (c) reacting carbon monoxide with at least a portion of the first chlorine fraction to form a first phosgene fraction, (d) reacting carbon monoxide with at least a part of the second chlorine fraction to form a second phosgene fraction, (e) reacting at least a portion of a first phosgene fraction with at least one amine of the diphenylmethane diamine series (MDA) to form the corresponding polyphenylene-polymethylene polyisocyanate (PMDI), and (f) reacting at least a portion of the second phosgene fraction with at least one primary amine with the exception of mono- and polyphenylene-polymethylene polyamines to form an at least one isocyanate-containing reaction solution.

Process for the preparation of light-colored iocyanates of a diphenylmethanediisocyanate series

The invention provides a process for preparing diphenylmethanediamine, comprising the steps of:

Two-stage process for cost-effective deposition of homogeneous catalysts in MDA synthesis

Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.

Method for the purification of isocyanates

The invention relates to a process for preparing polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one residence apparatus and the third stage in at least one separation apparatus and the pressure in each successive stage being lower than that in the previous stage.

Method for the continuous production of isocyanates

The invention provides a process for the simultaneous preparation of 4,4'-diphenylmethanediamine and also diphenylmethane diisocyanate and polyphenylenepolymethylene polyisocyanates, which comprises the steps

Process for simultaneously preparing 4,4'-diphenylmethanediamine and diphenylmethane diisocyanate and polyphenylenepolymethylene polyisocyanates

The invention relates to a process for separating hydrogen chloride and phosgene, which comprises bringing a mixture of hydrogen chloride and phosgene into contact with an ionic liquid in which at least part of the hydrogen chloride is dissolved in a step a) and then separating off the hydrogen chloride dissolved in the ionic liquid in a step b).

Method for separating hydrogen chloride and phosgene

Isocyanates are prepared by reacting primary amines with phosgene in a reactor by a process in which a reaction discharge is present in the form of a suspension which contains the isocyanate to be prepared, as a liquid, and carbamyl chlorides as a solid, and the suspension is worked up in a film evaporator, and this process is carried out in a production plant.

Reprocessing of reaction material discharged from phosgenation reactors

The invention relates to a process for the partial or complete separation of a mixture comprising hydrogen chloride and phosgene, possibly solvents and possibly low boilers and inerts as are typically obtained in the preparation of isocyanates by reaction of amines with phosgene, which comprises firstly carrying out a partial or complete condensation of phosgene, then a distillation or stripping step in a column to remove the hydrogen chloride from the bottom product phosgene and subsequently a scrub of the top product hydrogen chloride by means of the process solvent to absorb the phosgene in the process solvent. An after-purification by means of adsorption on activated carbon or by another suitable method can subsequently be carried out to remove solvent residues.

Separation of a substance mixture consisting of hydrogen chloride and phosgene

The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably two-stage, distillation process in which the solvent is separated off at a pressure of 0.1-15 bar in a first apparatus and at 1-900 mbar in a second apparatus or further apparatuses, with the heat of condensation of the solvent vapor from the first apparatus being used for partial or complete vaporization of solvent in the second apparatus.

Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent

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

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Kallstadt, Germany

Hans-Juergen Pallasch