Basf Aktiengesellschaft

Basf Se Corporation

Gerhard Schulz

Detlef Kratz

Johann-Peter Melder

Guido Voit

Achim Stammer

Matthias Dernbach

Wolfgang Harder

Marc Walter

Joachim Wulff-Doring

Wolfgang Siegel

Michael Hesse

Boris Breitscheidel

Eckhard Stroefer

Frank Funke

Michael Koch

Karl-Heinz Ross

Manfred Sauerwald

Frank Gutschoven

G&uuml;nther Ruider

Gutshoven Frank

Jochem Henkelmann

Andreas Kramer

Oskar Zelder

Heinz-Peter Rink

Peter Schwab

Steffen Maas

Armin Stamm

Harald Rust

Heiko Maas

Werner-Alfons Jung

Wolfgang Reif

Arthur H&ouml;hn

Stephan Freyer

Edgar Zeller

Michael R&ouml;per

Mathias Haake

Heinrich-Josef Blankertz

Gerald Meyer

Bernhard Geissler

Matthias Kloetzer

Martin Fiene

Joachim Wulff-D&ouml;ring

Jan Nouwen

Sylvia Huber

Hagen Weigl

Volker Krase

Gunter Georgi

Philip Buskens

Philipp Buskens

Heike Maier

Andreas Warzecha

The invention relates to a multistage process for the continuous preparation of organic, distillable isocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic amines with urea and alcohols to liberate ammonia and form low molecular weight monomeric urethanes and thermal dissociation of the latter, in which by-products formed are at least partly utilized.

Method for producing isocyanates

The present invention relates to a process for preparing pentamethylene 1,5-diisocyanate, to pentamethylene 1,5-diisocyanate prepared in this way and to the use thereof.

Process for preparing pentamethylene 1,5-diisocyanate

In a process for the catalytic hydrogenation of a polymethylolalkanal or a monomethylolalkanal of the formula (I) where R may be identical or different and are each a substituted or unsubstituted aliphatic hydrocarbon having from 1 to 22 carbon atoms, an aryl or arylalkyl group having from 6 to 22 carbon atoms or a methylol group, in the presence of a copper-containing catalyst, the hydrogenation feed comprising the polymethylolalkanal or monomethylolalkanal has a total content of metal ions of groups 3 to 14 of the Periodic Table of the Element of up to 5 ppm.

Method for hydrating poly-or monomethylol alkanals

Formaldehyde is removed by distillation from reaction solutions containing a methlolated alkanal which was obtained from the reaction of formaldehyde with an alkanal which has at least one acidic hydrogen atom &agr; to the carbonyl function or from the reaction of a 2-alkylacrolein or acrolein with water and formaldehyde, by a process in which this reaction was carried out in the presence of catalytic amounts of organic amine. The process permits the improved removal of formaldehyde from the reaction mixture and furthermore facilitates the hydrogenation of the alkanals thus obtained to give polyols.

Method for the separation of formaldehyde from a reaction mixture containing polyols by the addition of solvents before and/or during the distillation

Polyisocyanates as coating components for coating means rich in solids

Method for purifying trimethylolpropane, which is produced by hydrogenation, by means of continuous distillation

A process for greatly improving the color index of polyhydric alcohols, especially trimethylolpropane, by hydrogenation comprises using, in the hydrogenation, an alcohol which has already been purified by distillation. The catalysts used are those conventionally employed in hydrogenations, preferably copper, nickel, palladium or ruthenium catalysts.

Color number improvement in polyhydric alcohols by hydrogenation

A process is provided for increasing the yield in the preparation of polyhydric alcohols obtained from methylolated alkanals by hydrogenation, wherein derivatives of these alcohols are decomposed by adding 5 ppm to 1% by weight, preferably 100 to 1000 ppm, of a suitable acid to an anhydrous mixture containing these derivatives, heating the mixture to temperatures of 100 to 300&deg; C. and then separating off the polyhydric alcohol by distillation. This process makes it possible simply and efficiently to decompose compounds which boil above the polyhydric alcohol and are unwanted by-products of its synthesis.

Method for the decomposition of high boiling by-products produced in the synthesis of polyhydric alcohols

A process for the preparation of one or more ethanolamines (I), chosen from the group consisting of monoethanolamine, diethanolamine and triethanolamine, by conversion of one or more ethanolamines (II) different from the ethanolamine(s) (I), chosen from the group consisting of monoethanolamine, diethanolamine, triethanolamine. O,N,N-tris(2-hydroxyethyl) ethanol-N-(2-aminoethyl)-ethanolamine, N-(2-amine, hydroxy ethyl) piperazine, N-(2-hydroxyethyl)morpholine and N,N&prime;-bis(2-hydroxyethyl)piperazine, where the ethanolamine(s) (II), optionally in the presence of ammonia, is/are treated with a strong base.

Process for the preparation of ethanolamines

A process for the catalytic hydrogenation of a carbonyl compound or of a mixture of two or more carbonyl compounds in the presence of a catalyst which comprises an inorganic support containing TiO , and as active component copper or a mixture of copper and at least one of the metals selected from the group of zinc, aluminum, cerium, a noble metal and a group VIII metal, wherein the copper surface area does not exceed 10 m /g.

Method for hydrogenating carbonyl compounds

Preparing amines

Functionalized cyclopentene-derived oligomer mixtures, their preparation and their use

Preparation of alkanolamines having improved color quality by treating the alkanolamine with an effective amount of phosphorous acid or hypophosphorous acid or compounds thereof initially at elevated temperature over a period of at least 5 min (step a), and then distilling it in the presence of an effective amount of one of these phosphorus compounds (step b).

Process for the preparation of alkanolamines having improved color quality

Preparation of alkanolamines having improved color quality by treating the alkanolamine with hydrogen in the presence of a hydrogenation catalyst at elevated temperature, by using, as hydrogenation catalyst, a heterogeneous catalyst comprising Re, Ru, Rh, Pd, Os, Ir, Pt and/or Ag and a support material chosen from the group consisting of activated carbon, alpha-aluminum oxide, zirconium dioxide and titanium dioxide, where the catalyst, in the case of activated carbon as support material, has a cutting hardness of at least 10 N, a side crushing strength of at least 30 N or a compressive strength of at least 25 N.

A carbonyl compound or a mixture of two or more carbonyl compounds is catalytically hydrogenated in the presence of a Raney copper catalyst in the form of nuggets.

Method for the hydrogenation of carbonyl compounds

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Ludwigshafen, Germany

Gerhard Schulz