Basf Se Corporation

Michael Zoellinger

Eckhard Stroefer

Kai Thiele

Heiner Schelling

Andreas Raichle

Renate Hempel

Daniel Breuninger

Holger Allardt

Ruediger Fritz

Anne-Kathrin Merten

Stefanie Haase

Reiner Reetz

Markus Kraemer

Rolf Pinkos

Ulrich Penzel

Samuel Neto

Matthias Eiermann

Joana Coelho Tsou

Jon S Speier

Steffen Oehlenschlaeger

Johannes Buettner

Peter Van Den Abeel

Holgar Braunsberg

Johannes Adam

Robert Reinhardt

Elvira Flegel

Annett Gersdorf

Sandra Mühlbeyer

Ina Homann

Doris Zschieschang

Johnny Moors

Olaf Wiedenhoff

Alexander Schocker

Dusko Kadijevic

The present invention relates to a process for workup of nitrite-comprising alkaline process wastewaters from the nitration of aromatic compounds, wherein the alkaline process wastewater is acidified by addition of acids and the offgas which comprises nitrogen oxides and escapes from the acidified process wastewater is worked up, comprising the steps of

[object Object]

A process for preparing aromatic amines by hydrogenation of nitroaromatics in the presence of catalysts, forming a fluid, amine-comprising reaction mixture in a reactor, wherein chromatographic analysis of the reaction mixture is carried out to determine the concentration of nitro and nitroso compounds in the reaction mixture.

Process for preparing aromatic amines

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 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

The invention relates to a process for the continuous preparation of toluenediamine by liquid-phase hydrogenation of dinitrotoluene by means of hydrogen in the presence of a suspended, nickel-comprising catalyst in a reactor with a product isolation unit downstream of the reactor to give a product output from the reactor comprising a liquid phase comprising toluenediamine and dinitrotoluene, in which the nickel-comprising catalyst is suspended, wherein the concentration of dinitrotoluene in the liquid phase of the product output from the reactor in the region between the reactor and the downstream product isolation unit is set to a value in the range from 1 to 200 ppm by weight, based on the total weight of the liquid phase of the product output from the reactor.

Process for preparing toluenediamine by hydrogenation of dinitrotoluene

A process for working up alkaline process wastewater from the nitration of aromatic compounds to mono-, di- and trinitroaromatics, said alkaline process wastewater having a pH of 7.5 to 13, comprising the steps of

Acidic sludge adsorption of DNT wastewaters

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Eislingen, Germany

Michael Zoellinger