Bayer Materialscience Ag

Covestro Deutschland Ag

Bayer Materialscience, LLC

Jeffrey Bolton

Hans-Georg Pirkl

Jochen Mahrenholtz

James W Rosthauser

Stefan Wershofen

Thomas Knauf

Walter Meckel

Friedhelm Steffens

Berthold Keggenhoff

Andreas Karl Rausch

Torsten Hagen

Matthias Wintermantel

Udo Wolf

Christian Steffens

Thomas Runowski

Alexandre Racoes

Heinz-Herbert Müller

Ulrich Wolf

Gerhard Ruffert

Martin Schiffhauer

James T Garrett

Martin Gerlach

Marc Seekamp

Andrea Wimschneider

Stefan Dresely

Jürgen Kern

Johannes Schweer

One or more fluid streams are uniformly divided into two or more partial fluid streams in chemical apparatuses in a manner such that there is a reduced tendency to form deposits. Division of such stream(s) is achieved by using a distributor device that includes at least one plate having two or more openings which openings are rounded or chamfered on at least one side.

Method for dividing fluid streams

This invention relates to a process for the continuous preparation of nitrobenzene. This process comprises the adiabatic nitration of benzene with a mixture of sulfuric acid and nitric acid, in which the sum of the concentrations in the reaction zone of the metal ions which form sparingly soluble metal sulfates is less than 900 mg/l, based on the volume of the aqueous phase which contains sulfuric acid.

Process for the preparation of nitrobenzene by adiabatic nitration

The invention relates to a method for determining the isomer composition in an isocyanate isomer mixture, wherein a spectrum of the isomer mixture is recorded and the spectrum is entered into a chemometric calibration model.

Method and device for determining the isomer composition in isocyanate production processes

The present invention relates to a process for the production of MDI fractions containing 2,4'-MDI, and in which the 2,2&#x2032;-MDI component from the MDA production is largely removed from the isomer mixture. Highly reactive monomeric MDI products can be produced in this way. These MDI products are characterised in their processing by significantly reduced emissions of MDI monomers.

Process for the production of very pure 2,4'-methylenediphenyl diisocyanate

The invention relates to an improved process for the production of isocyanates by the reaction of an amine or a mixture of two or more amines with phosgene, the improvement involving the phosgene containing less than about 100 ppm of sulfur in elemental or bound form. The inventive process yields light-colored isocyanates that are suitable for the production of polyurethanes or their precursors (e.g. prepolymers) without the treatment processes heretofore required.

Process for the production of light-colored isocyanates

The present invention relates to an improved process for the production of carbodiimide modified organic isocyanate, preferably a polymethylene polyphenylisocyanate, and most preferably diphenylmethane diisocyanate. This process includes (1) neutralizing acidic impurities in an organic isocyanate, (2) partially carbodiimidizing isocyanate groups of the neutralized organic isocyanate, and (3) terminating the carbodiimidization reaction.

Process for the production of carbodiimide modified organic isocyanates

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Baytown, TX, United States of America

Jeffrey Bolton