Basf Se Corporation

Josef Meissner Gmbh & Co. Kg

Julia Leschinski

Eckhard Stroefer

Torsten Mattke

Samuel Neto

Sebastian Ahrens

Michael Bock

Renate Hempel

Gerrit Waters

Axel Franzke

Radwan Abdallah

Barbara Becker

Holger Allardt

Leo Denissen

Mirko Haendel

Jochem Henkelmann

Robert Baumann

Otto Machhammer

Matthias Kroner

Stephan Andreas Schunk

Horst Binder

Harald Schaefer

Stefan Bitterlich

Stephan Deuerlein

Jan-Dirk Arndt

Heinrich Hermann

Dirk Klingler

Petra Deckert

Roman Prochazka

Mirko Händel

Jürgen Pöhlmann

Ruediger Fritz

Mario Emmeluth

Kerstin Heinen

Alexander Bayer

Dieter Stützer

Rüdiger Fritz

Bart Van De Voorde

Yuan Shen Dai

Ludwig E Heck

Yuanshen Dai

Matthias Fankhaenel

Stefan Robert Deibel

Emmanouil Pantouflas

Henrich Hermann

Juergen Poehlmann

Matthias Fankhänel

Peter Gammer

Andreas Heußler

Process for scrubbing a crude mixture which is obtained in the nitration of toluene after separating off the nitrating acid and comprises dinitrotoluene, nitric acid, nitrogen oxides and sulfuric acid, which comprises two scrubbing steps (WS-I) and (WS-II), wherein i) in a first scrubbing step (WS-I), the crude mixture is extracted with a scrubbing acid I comprising nitric acid, nitrogen oxides and sulfuric acid in a scrub comprising at least one extraction stage, where the scrubbing acid discharged from the first extraction stage (WS-I-1) of the first scrubbing step (WS-I) has a total acid content of from 10 to 40% by weight and a content of from 80 to 350 ppm of hydrocyanic acid, giving a prescrubbed crude mixture, ii) in a second scrubbing step (WS-II), the prescrubbed crude mixture comprising dinitrotoluene is extracted with a scrubbing acid II in a scrub comprising at least one, preferably at least 2, extraction stage(s), where the scrubbing acid discharged from the first extraction stage (WS-II-1) of the second scrubbing step (WS-II) has a pH of less than or equal to 4, giving a dinitrotoluene-comprising mixture which is essentially free of nitric acid, sulfuric acid, nitrogen oxides and hydrocyanic acid and has a content of not more than 300 ppm of nitric acid and nitrogen oxides, not more than 3 ppm of sulfate and not more than 50 ppm of hydrocyanic acid.

Process for acidic scrubbing of dinitrotoluene in the presence of hydrocyanic acid

The invention relates to a process for scrubbing a crude mixture comprising dinitrotoluene, nitric acid, nitrogen oxides and sulfuric acid obtained in the nitration of toluene after the nitrating acid has been separated off, which comprises two scrubbing steps (SS-I) and (SS-II), wherein

Process for scrubbing dinitrotoluene

The present invention relates to a process for preparing polyisocyanates from natural raw material sources, in which a composition comprising low molecular weight aromatics which comprise at least one hydroxy group or at least one alkoxy group per molecule (oxyaromatics) is produced from a biomass material, these oxyaromatics are converted into the corresponding aromatic amines and, optionally after condensation with formaldehyde, reacted further with phosgene to give compounds comprising isocyanate groups.

Process for preparing polyisocyanates from biomass

Process for preparing aromatic isocyanates by reacting the corresponding formamides with an oxygen-comprising gas over noble metal catalysts at temperatures of from 300 to 600&#xb0; C. and a contact time of from 1 to 1000 ms, wherein:

Process for preparing isocyanates

The invention relates to a process for purifying crude aromatic nitro compounds which originate from the nitration of aromatic compounds, comprising the single or multiple performance of the following wash stage (a):

Process for purifying wastewaters from the workup of crude aromatic nitro compounds

The invention relates to a process for preparing isocyanates and/or polyisocyanates by reacting the corresponding amines with phosgene, optionally in the presence of an inert medium, in a reactor (), a first reactant stream comprising the amine being supplied to the reactor () in liquid form, and a second reactant stream comprising the phosgene being supplied to the reactor in gaseous form. The reactor is a centrifugal reactor () having a packing () which rotates about a central axis () in a housing (), the first reactant stream and the second reactant stream being supplied to the rotating packing () such that the reactant streams are mixed due to the centrifugal force in the rotating packing () and are transported outward, the mixing in the rotating packing () resulting in reaction of the phosgene with the amine to give the corresponding isocyanate or polyisocyanate.

Process for preparing isocyanates and/or polyisocyanates

The invention relates to a process for the preparation of formamides by reacting aromatic amines with a formic acid ester in the presence of a catalyst, wherein the catalyst is a phosphorus-containing acid or a Lewis-acidic metal salt.

Process for the preparation of aromatic formamides

The present invention relates to a process for preparing polyisocyanates comprising biuret groups from diisocyanates or polyisocyanates and diamines.

Process for preparing polyisocyanates comprising biuret groups

The present invention relates to a process for continuously preparing a mononitrated organic compound, especially a process for preparing mononitrobenzene. The invention relates more particularly to an improved continuous adiabatic process for preparing nitrobenzene.

Process for preparing mononitrated organic compounds

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Ixelles, Belgium

Julia Leschinski