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Ome Technologies Gmbh

Markus Weber

Karl-heinz Wostbrock

Steffen Kerth

Eckhard Stroefer

Bernd Sachweh

Heinz Krueger

Joachim Thiel

Bernd Gerber

Bernd Rumpf

Andreas Woelfert

Carsten Knoesche

Torsten Mattke

Hans-Juergen Pallasch

Kai Thiele

Michael Bock

Neven Lang

Heiner Schelling

Ulrich Penzel

Martin Sohn

Hans Hasse

Wolfgang Mackenroth

Markus Siegert

Martin Sesing

Heinrich-Josef Blankertz

Matthias Kloetzer

Axel Franzke

Jon S Speier

Julia Leschinski

Jochem Henkelmann

Robert Baumann

Stefan Maixner

Filip Nevejans

Martin Fiene

Christoph Sigwart

Andreas Brodhagen

Joachim Pfeffinger

Christian Mueller

Matthias Eiermann

Andreas Johann Schmidt

Bernhard Geissler

Filip Deberdt

Michael Zoellinger

Peter Van Den Abeel

Volker Krase

Rolf Pinkos

Ulrich Steinbrenner

Achim Stammer

Andreas Daiss

Gerhard Schulz

Ralf Boehling

Andreas Wölfert

Martin Karches

Lothar Seidemann

Olga Schubert

Manfred Heilig

Christian Müller

Daniel Breuninger

Radwan Abdallah

Georg Krug

Johannes Jacobs

Tsung-Chieh Cheng

Byoung-Yeon Kim

Gunter Georgi

Rolf Hartmuth Fischer

Wolfgang Siegel

Wolfgang Rohr

Oskar Zelder

Peter Zehner

Otto Machhammer

Stephan Andreas Schunk

Klaus Harth

Edward Michael Dexheimer

Michael Ochse

Christian Walsdorff

Hartwig Voss

Thomas Ostrowski

Ortmund Lang

Stefan Bitterlich

Michael Steiniger

Gerhard Theis

Stephan Deuerlein

Stephan Freyer

Armin Diefenbacher

Laszlo Szarvas

Jan-Dirk Arndt

Michael Schönherr

Ute Lichtfers

Gerrit Waters

Hermann Ascherl

Hans Volkmar Schwarz

Dirk Klingler

Thorsten Friese

Roman Prochazka

Helmut Moehwald

Oliver Huttenloch

Regina Hendreich

Tobias Kortekamp

Franz Niklaus Windlin

Dieter Stuetzer

Stephan Scholl

Johannes Buettner

Steffen Oehlenschlaeger

Thomas Grassler

Mario Emmeluth

Process for preparing polyoxymethylene dimethyl ethers having &#x2265;3 oxymethylene units (OME), comprising the steps: (i) introduction of formaldehyde, methanol and water into a reactor R and reaction to give a reaction mixture containing formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, methylal (OME) and polyoxymethylene dimethyl ethers (OME);(ii) introduction of the reaction mixture into a reactive distillation column Kand separation into a low boiler fraction Fcontaining formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, methylal (OME) and polyoxymethylene dimethyl ethers having from 2 to 3 oxymethylene units (OME) and a high boiler fraction Fcontaining polyoxymethylene dimethyl ethers having more than two oxymethylene units (OME).

Process for preparing polyoxymethylene dimethyl ethers from formaldehyde and methanol in aqueous solutions

A process for the preparation of mononitroaromatics and dinitroaromatics, in which a hydrate melt of at least one metal nitrate M(NO)is used as a nitrating medium, it being possible for M to be the metals Fe, Cr, Y, La, Ce, Al, Bi and In, and the metal nitrate having a water content of from 4 to 9 mol of water per M(NO), leads to simplifications of the process and improved yields.

Process for the preparation of nitrated aromatics and mixtures thereof

The present invention comprises a process for purifying isocyanate-comprising residues.

Method for purifying residues containing isocyanates

The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, optionally in the presence of an inert medium, in which phosgene and amine are first evaporated and then superheated further to reaction temperature, and the superheated phosgene and amine are mixed and fed to a reactor in which the phosgene and the amine are converted to the isocyanate, wherein the residence time of the phosgene at temperatures greater than 300&#xb0; C. is not more than 5 s, and/or the temperature of heat transfer surfaces in contact with phosgene is not more than 20 K above the phosgene temperature to be established. The invention further relates to an apparatus for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase.

Process and apparatus for preparing isocyanates

A process for coproducing di- and/or polyisocyanates and glycols, comprising process stages A, B, C and E for preparing glycols and process stages A, C, D, E, F and G for preparing di- and/or polyisocyanates, which comprises 

Process for coproducing di- and/or polyisocyanates and glycols

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

The invention relates to a multistage process for the continuous preparation of organic, distillable polyisocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic polyamines with carbonic acid derivatives and alcohols to form low molecular weight monomeric polyurethanes and thermal dissociation of the latter, in which the polyisocyanates produced and unusable residues are separated off at particular stages of the reaction and reusable by-products and intermediates are recirculated to preceding stages.

Process for preparing isocyanates

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 present invention accordingly provides a process for preparing light-colored polyphenylene-polymethylene polyisocyanates comprising the steps (a) providing an amount of chlorine, (b) separating the chlorine provided in the step (a) to obtain a first chlorine fraction having a content of free and bound bromine and iodine of &#x3c;50 ppm and a second chlorine fraction having an increased content of free and bound bromine and iodine that depends on the original amount of bromine and iodine in the chlorine provided in step (a) and the separation split, (c) reacting carbon monoxide with at least a portion of the first chlorine fraction to form a first phosgene fraction, (d) reacting carbon monoxide with at least a part of the second chlorine fraction to form a second phosgene fraction, (e) reacting at least a portion of a first phosgene fraction with at least one amine of the diphenylmethane diamine series (MDA) to form the corresponding polyphenylene-polymethylene polyisocyanate (PMDI), and (f) reacting at least a portion of the second phosgene fraction with at least one primary amine with the exception of mono- and polyphenylene-polymethylene polyamines to form an at least one isocyanate-containing reaction solution.

Process for the preparation of light-colored iocyanates of a diphenylmethanediisocyanate series

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:

The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, if appropriate in the presence of at least one inert medium, in which the amine and the phosgene are first mixed in a mixing chamber () to give a reaction mixture and the reaction mixture is fed to a reactor, the amine being added through an orifice () arranged coaxially to the mixing chamber () and the phosgene being added through feed orifices () in at least two planes () arranged at right angles to the axis () of the mixing chamber (), or the phosgene being added through the orifice () arranged coaxially to the mixing chamber and the amine through the feed orifices () in at least two planes () arranged at right angles to the axis () of the mixing chamber (). At least one plane () is arranged upstream and at least one plane () downstream of the orifice () arranged coaxially to the mixing chamber () in main flow direction of the reaction mixture. The mean residence time of the reaction mixture in the mixing chamber () is not more than 20 ms.

Process for preparing aromatic isocyanates

A process is proposed for preparing isocyanates by thermally cleaving carbamates to obtain a carbamate cleavage gas comprising the corresponding isocyanate and the corresponding alcohol, which comprises quenching the carbamate cleavage gas in the presence of an ether which functions as an inhibitor for the reverse reaction of the isocyanate with the alcohol.

Process for preparing isocyanates by thermally cleaving carbamates

Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel.

The present invention relates to a process for the production of isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), by reacting an amine with phosgene in the liquid phase or in the gas phase to form the corresponding isocyanates, subsequent removal of the solvent in at least two steps to obtain at least two solvent streams, individual treatment of the at least two solvent streams, and recirculation of at least a portion of the solvent streams.

Process for the production of isocyanates, preferably diisocyanates and polyisocyanates with solvent recirculation

The present invention relates to a process for preparing light-colored polyphenylene-polymethylene-polyisocyanate (PMDI), comprising the steps (a) providing carbon monoxide and chlorine, (b) reacting carbon monoxide with chlorine to form phosgene, (c) reacting the phosgene from step (b) with at least one primary amine with the exception of mono- and polyphenylene-polymethylene polyamines with an excess of phosgene to form an at least one isocyanate containing reaction solution, and hydrogen chloride, (d) separating excess phosgene from the isocyanate-containing reaction solution obtained in step (c), (e) providing at least one polyphenylene-polymethylene polyamine, and (f) reacting at least a portion of the phosgene separated in step (d) with the at least one polyphenylene-polymethylene polyamine to form the light-colored polyphenylene-polymethylene polyisocyanate.

Process for preparing light-coloured isocyanates of the diphenylmethane series

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Mannheim, Germany

Eckhard Stroefer