Basf Aktiengesellschaft

Hans Volkmar Schwarz

Ulrich Penzel

Eckhard Str&ouml;fer

Volker Scharr

Jan Jacobs

Wilfried Seyfert

Olaf Schweers

Filip Nevejans

Andreas Otterbach

Peter Van Den Abeel

Michael Sander

Markus Maurer

Franz Merger

Ekkehard Schwab

Eckhard Stroefer

Peter Zehner

Roland Minges

Wolfgang Mackenroth

Carsten Knoesche

Stefan Maixner

Wolfgang Schwarz

Joachim Pfeffinger

Hans-Juergen Pallasch

Eckhard Ströfer

Frank Poplow

Martin Sohn

Peter Magnussen

Martin Reif

Dominic Vanoppen

Gerhard Laqua

David Agar

J&ouml;rg Therre

Gunter Georgi

Ralf B&ouml;hling

Otto Mattner

Joerg Therre

Eckhardt Brandt

J&ouml;rn M&uuml;ller

Rene Leuthold

Willy Van Pee

Dieter Starosta

Dieter St&uuml;tzer

Siegfried Richter

Burghard Hantel

J&uuml;rgen Dosch

Hilmar Boesel

Fritz N&auml;umann

Ulrich Schoner

Gerald Molz

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 preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75&#xb0; C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.

Process for preparing methylenedianiline and methylenebis (phenylisocyanate)

A process is provided for preparing light-colored isocyanates which can be used for preparing urethane compounds, in particular polyurethanes, for example polyurethane foams.

Light isocyanates, method for producing them and use thereof

Process for preparing methylenedianiline and methylenebis(phenyl isocyanate)

A process for working up distillation residues from the synthesis of tolylene diisocyanate by reaction of the distillation residues with water comprises reacting the TDI distillation residues with water in a continuous or semicontinuous process in a backmixed reactor in the presence of hydrolysate.

Work-up of distillation residues from the synthesis of toluene diisocyanate

In a process for preparing mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced content of chlorinated by-products and a reduced iodine color number by two-stage reaction of the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene in the presence of at least one inert organic solvent at elevated temperature, separation of the excess phosgene and solvent after the phosgenation is complete and thermal treatment of the reaction product, the mass ratios of phosgene to hydrogen chloride in the residence time apparatus of the second stage of the phosgenation are at the same time 10-30:1 in the liquid phase and 1-10:1 in the gas phase.

METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX

A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75&deg; C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.

Method for the production of methylenedi(phenylamine and methylenedi(phenyl isocyanate)

Organic diurethanes and/or polyurethanes are prepared by reacting organic diamines and/or polyamines (a) with urea and/or alkyl cabamates (b) and alcohols (c) in the presence of soluble zirconium compounds, preferably zirconium alkoxides, zirconium acetate or zirconium acetylacetonate, as catalyst (d). They can be used for preparing diisocyanates and/or polyisocyanates by thermal dissociation.

Method of producing organic diurethanes and/or polyurethanes and their use in the production of di and/or polyisocyanates

The invention relates to a process for the preparation of amines by hydrogenation of nitro compounds, which comprises carrying out the hydrogenation in a vertical reactor whose length is greater than its diameter, having a downward-facing jet nozzle arranged in the upper region of the reactor through which the starting materials and the reaction mixture are fed in, and having an outlet at any desired point of the reactor, through which the reaction mixture is fed back to the jet nozzle in an external circuit by means of a conveying means, and having flow reversal in the lower region of the reactor.

Method for producing amines

In a reactor for the thermal cleavage of mono- and polyfunctional carbamic esters into the corresponding isocyanates and the hydroxyl component in the liquid phase, the geometry of the reactor, defined by the degassing area in relation to the volume and the arrangement of the heating surfaces, permits cleavage in a two-phase mixture which has a volumetric gas content of more than 50%.

Thermal cleavage of carbamic esters

The invention relates to a method of reacting alkyl carboxylate chlorides and/or carboxylic dichlorides dissolved in corresponding diaikyl carboxylates with the corresponding alkanol at temperatures ranging from 60.degree. to 300.degree. C., in which the resultant hydrogen chloride remains in the reaction mixture.

Method of reacting carboxylic chlorides dissolved in carboxylates

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Waterloo, Belgium

Hans Volkmar Schwarz