Bayer Aktiengesellschaft

Bayer Materialscience Ag

Gerhard Wegener

Markus Weisbeck

Christoph Schild

Hartmut Knofel

Ernst-Ulrich Dorf

Georg Wiessmeier

Markus Dugal

Marie-Therese Heinen

Stephan Klein

Daniel Koch

Joachim Zechlin

Peter Vogtel

Ulrich Sch&uuml;lke

Hans Warlimont

Bernhard L&uuml;cke

Bodo Temme

Herbert Dilcher

Michael Brockelt

Theodor Engbert

Dietmar Wastian

Hans-Georg Pirkl

Christine Mendoza-Frohn

Hartmut Hetzel

Andreas Hoffmann

Gunther Ellendt

Dieter Grenner

Christian Steinlein

Marcel Petinaux

Hans-Peter Schal

Matthias Brandt

Eckart Waldau

Rudolf Uchdorf

Spotswood Miller

Dirk Grotjohann

Jorg Schmitt

Ricardo Serra

Jürgen Kirsch

Heinz-Herbert M&uuml;ller

Lothar Duda

Uta K&uuml;hn

Bernd Pennemann

Jörg Schmitt

R&uuml;diger Drope

J&ouml;rg Schmitt

Martin St&uuml;rmann

Frank Zbrozek

Ernst Ulrich Dorf

A two-stage process for the preparation of organic isocyanates by reacting primary amines with phosgene in which: a) in a first stage, amine and phosgene are reacted in an adiabatically managed reaction, in which the temperature of reaction is restricted to values between 100 and 220&#xb0; C. by actively adjusting the absolute pressure in the reactor to values between 8 and 50 bar by decompression, and the temperature is held at values between 100 and 220&#xb0; C. until the stoichiometric conversion of phosgene has reached at least 80%; and then b) in a second stage, the reaction mixture from a) is decompressed to an absolute pressure of 1 to 15 bar and the reaction mixture is reacted further at temperatures between 90 and 240&#xb0; C., optionally with the introduction of heat.

Process for preparing polyisocyanates by the adiabatic phosgenation of primary amines

The invention relates to a process for the production of Raney nickel catalysts. In this process, the melt of an alloy comprising from 40 to 95 wt. % aluminum, from 5 to 50 wt. % nickel, 0 to 20 wt. % iron, from 0 to 15 wt. % of one or more transition metals selected from the group consisting of cerium, cerium mixed metal, vanadium, niobium, tantalum, chromium, molybdenum and manganese, and, optionally, additional glass-forming elements, is brought into contact with one or more rotating cooling rollers or cooling plates and is allowed to cool and solidify thereon. The cooling rollers have a surface structured by means of transverse grooves, and the cooling plates have a surface structured by means of grooves extending outwards from the axis of rotation. The rapidly solidified alloy on the cooling rollers or the cooling plates is then subjected to treatment with one or more organic or inorganic bases.

Process for the production of Raney nickel catalysts and their use in the hydrogenation of organic compounds

The present invention provides a catalyst containing titanium in bonded form, non-crystalline silicon dioxide and at least one crystalline silicate phase which has a zeolite structure, wherein the non-crystalline silicon dioxide is applied to at least one of the crystalline silicate phases which have a zeolite structure and wherein at least one of the crystalline silicate phases which have a zeolite structure contains silicon-carbon bonds with which non-hydrolytically separable organic groups R are bonded to silicon. Furthermore, the present invention provides a process for preparing this catalyst and a process for producing an epoxide from a compound which contains a carbon-carbon double bond (preferably from propene) comprising reacting the compound which contains a carbon-carbon double bond with hydrogen peroxide in the presence of the catalyst according to the invention.

Catalyst

The present invention relates to noble metal-containing catalysts which are composed of at least one organic/inorganic hybrid material which is composed of at least one titanium component and at least one Si&#x2014;H group. The catalysts of the present invention have increased activity compared to known catalysts.

Catalysts which are based on organic-inorganic hybrid materials containing noble metals and titanium and which are used for selectively oxidizing hydrocarbons

The present invention provides hydro-oxidation catalysts for the oxidation of hydrocarbons, containing an organic-inorganic hybrid material as well as gold particles and/or silver particles, a process for the production thereof, and the use thereof as a catalyst.

The present invention relates to a process for preparing a composition containing gold and/or silver particles and an amorphous, organic/inorganic titanium/silicon mixed oxide, the compositions which can be prepared by this process and their use as catalysts for the selective oxidation of hydrocarbons.

Sol-gel hybrid materials containing precious metals as catalysts for partial oxidation of hydrocarbons

The present invention relates to a process for the production of a dinitronaphthalene isomer mixture, in which naphthalene and/or 1-nitronaphthalene is reacted with nitric acid in the presence of a zeolite.

Process for the production of a dinitronaphthalene isomer mixture with a high proportion of 1,5-dinitronaphthalene

This invention relates to a process for the production of a composition containing gold and/or silver particles, mixed oxides containing titanium and silicon which have been surface-modified, to the compositions producible in this process and to the use thereof in processes for the selective oxidation of hydrocarbons in the presence of oxygen and a reducing agent. The catalytically active compositions exhibit constantly high selectivities and productivities.

Surface-modified mixed oxides containing precious metal and titanium, for the selective oxidation of hydrocarbons

The present invention relates to the continuous production of nano-scale precious metal particles on SiH-containing support materials, the compositions themselves, and the use of these precious metal-containing compositions as catalyst. The continuous process according to the invention includes impregnating support materials and, after thermal activation, drying the support materials by spraying or by fluidized bed technology leads to form precious metal-containing support compositions that are active in the catalysis of oxidation reactions. The catalytically active precious metal-containing support compositions exhibit high selectivities and productivities and have very long catalyst service lives without deactivation. The invention also relates to a process for the oxidation of hydrocarbons in the presence of oxygen, a reducing agent and the precious-metal containing support compositions of the present invention.

Continuous process for the synthesis of nano-scale precious metal particles

The present invention concerns a process for the production of methylenedianiline (MDA) having a high monomer content.

Method for production of diaminodiphenylmethanes

The invention relates to a method for oxidizing hydrocarbons with a hydrogen/oxygen mixture in the presence of a catalyst. The catalyst contains a) a support material which contains titanium and b) silver particles having an average particle size ranging from 0.3 to 100 nm.

Method for oxidizing hydrocarbons

A supported catalyst coated with gold particles is produced. This supported catalyst is used to oxidize unsaturated hydrocarbons in the gas phase with a hydrogen/oxygen mixture.

Method for the direct catalytic oxidation of unsaturated hydrocarbons in gaseous phase

1,4-diaminonaphthalene and/or 1,5-diaminonaphthalene are produced by (a) reacting naphthalene with a halogen, (b) optionally, separating 1,4-dihalogen naphthalene or 1,5-dihalogen naphthalene from the mixture from step (a), and (c) reacting the mixture from step (a) or the 1,4-dihalogen naphthalene or the 1,5-dihalogen naphthalene from step (b) with ammonia and/or an organic amine in the presence of a catalyst.

Process for preparing 1,4-diaminonaphthalene and/or 1,5-diaminoNaphthalene

The invention relates to an integrated process for the preparation of epoxidised olefins. In the first stage, dilute hydrogen peroxide solutions are prepared from the elements hydrogen and oxygen and are reacted in a subsequent liquid-phase epoxidation with olefin in the presence of titanium silicalite to form epoxidised olefins, and the solvents are returned to the H O process again.

Integrated method for producing epoxides from olefins

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Mettmann, Germany

Gerhard Wegener