Basf Aktiengesellschaft

Basf Se Corporation

Martin Sohn

Eckhard Stroefer

Hans-Juergen Pallasch

Ulrich Penzel

Wolfgang Mackenroth

Filip Nevejans

Andreas Woelfert

Filip Deberdt

Jan D Jacobs

Andreas Brodhagen

Martin Sesing

Eckhard Ströfer

Martin Karches

Olga Schubert

Lothar Seidemann

Peter Van Den Abeel

Thomas Grassler

Rolf Pinkos

Gerd Kaibel

Ulrich Steinbrenner

Achim Stammer

Walter Dobler

Manfred Stroezel

Hans Hasse

Carsten Knoesche

Stefan Maixner

Kai Thiele

Andreas Wölfert

Carsten Oost

Hans Volkmar Schwarz

Helmut Moehwald

Steffen Oehlenschlaeger

Stephan Scholl

Gunter Georgi

Markus Maurer

Veronika Quaschning

Rene Leuthold

Jan Peter Bredehoeft

Jan Peter Bredehöft

Gerald Molz

Klemens Schilling

Hans-Jürgen Pallasch

Häns-Jürgen Pallasch

The invention relates to a process for preparing polyisocyanates by reacting primary amines with phosgene, which comprises the steps

Method for producing polyisocyanates

An oxidation process employing a mechanically stable catalyst of an active metal or combination of active metals supported on aluminum oxide, which is predominantly alpha-aluminum oxide, is provided. The active metal or metals is optionally one or a mixture of ruthenium, copper, gold, an alkaline earth metal, an alkali metal, palladium, platinum, osmium, iridium, silver, and rhenium. The process is applicable to the oxidation of hydrogen chloride to chlorine in a Deacon process.

Mechanically stable catalyst based on alpha-alumina

A catalyst for gas-phase reactions which has high mechanical stability and comprises one or more active metals on a support comprising aluminum oxide as support material, wherein the aluminum oxide in the support consists essentially of alpha-aluminum oxide. Ruthenium, copper and/or gold are preferred as active metal. Particularly preferred catalysts according to invention comprise The catalysts are preferably used in the oxidation of hydrogen chloride (Deacon reaction).

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

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

A process is proposed for the distillation or reactive distillation of a mixture that includes at least one toxic component, the process being carried out in a column containing a structured packing, having at least one packing layer () having a lower end () and an upper end (), the packing layer having an internal geometry varying over its height, in such a manner that in the distillation or reactive distillation, in a first, lower region () of the packing layer () a bubbling layer having a predominantly disperse gas phase can be established and simultaneously in a second, upper region () of the packing layer () a film flow having a predominantly continuous gas phase can be established.

Method for carrying out the distillation or reactive distillation of a mixture containing at least one toxic constituent

A process is described for preparing diaminodiarylmethanes comprising the steps

Method for the production of diaminodiarylmethanes

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

In an aqueous formaldehyde solution comprising formaldehyde in the form of monomeric formaldehyde, methylene glycol and polyoxymethylene glycols in a total concentration x of &#x2267;65% by weight, the mean molar massof the polyoxymethylene glycols is, as a function of the formaldehyde concentration, equal to or less than the values given by equation I: where:

Highly concentrated formaldehyde solution, production and reaction thereof

Growing community of inventors

Mannheim, Germany

Martin Sohn