Basf Aktiengesellschaft

Basf Se Corporation

Ströfer, Eckhard

Matthias Eiermann

Klaus Ebel

Eckhard Stroefer

Heiner Schelling

Kai Thiele

Ulrich Penzel

Thomas Narbeshuber

Jon S Speier

Thomas Papkalla

Rolf Pinkos

Hans-Josef Sterzel

Klemens Flick

Andreas Ansmann

Klaus Halbritter

Eugen Gehrer

Michael Bock

Gerd-Dieter Tebben

Andrea Haunert

Eckhard Ströfer

Daniel Breuninger

Christian Tragut

Michael Zoellinger

Johannes Jacobs

Markus Kraemer

Thomas A Grzanka

Johannes Adam

Eva Freudenthaler

William Portwood

Uwe Storck

Dave Beckwith

Dirk Hablawetz

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 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 invention relates to a method of measuring entry of water and resulting corrosion in plants for producing isocyanates by reacting phosgene with one or more primary amines in a solvent. The invention further relates to an apparatus for producing such isocyanates, in the work-up section of which probes for monitoring corrosion are arranged in defined places.

Method of measuring entry of water into phosgene-conducting plants

Method of producing alkanesulfonic acid

Method for producing alkanesulfonic acids

Method for producing lactams using oligophosphate catalysts

Aromatic hydrocarbons are nitrated by a process in which the aromatic hydrocarbon is reacted in the liquid phase with an oxide of nitrogen selected from NO, N O , NO and N O and with an oxygen-containing gas stream in the presence of a heterogeneous oxidic catalyst, wherein at least 0.1 mol %, based on the aromatic hydrocarbon, of water is present at the beginning of the reaction.

Nitration of aromatic hydrocarbons

The invention relates to a process for preparing lactams by cyclizing hydrolysis of amino nitriles with water in the gas phase on catalysts which comprise oxides or mixed oxides of the metals of groups 3, 4, 5, 13 and/or 14 of the Periodic Table, where appropriate in addition a metal oxide of groups 6, 7, 8, 9 and/or 10, and further comprise a phosphate, carbonate, silicate, arsenite, arsenate, antimonite, antimonate and/or nitrate of said metals and/or, if metal oxides of groups 6, 7, 8, 9 or 10 are present, a sulfate of the abovementioned metals.

Method for producing lactams

A process for preparing methanesulfonic acid by irradiating a mixture comprising acetic acid, sulfur dioxide and oxygen with light, wherein the reaction mixture is irradiated with an average cumulative irradiance in the range from 240 to 320 mm of from 0.05 to 50 mmol quanta/cm,h at the light entry area.

Preparation of methane sulfonic acid

The present invention relates to a process for preparing 2-cyclo-alkenones of the formula I ##STR1## which comprises subjecting a 2-alkoxycycloalkanone and/or a 2-hydroxyalkanone ketal, in which n is an integer from 0 to 20, m is 0, 1, 2 or 3 and R is alkyl, alkylaryl, aryl, arylalkyl, alkenyl or alkynyl, to an elimination reaction in the gas phase on an acidic heterogeneous catalyst.

Process for preparing 2-cycloalkenones

In a process for preparing N-alkenylcarboxamides by dehydration of N-(2-hydroxyalkyl)carboxamides and/or diethers thereof in the presence of a catalyst, molecular sieves, in particular zeolites, are used as catalyst.

Preparation of N-alkenylcarboxamides

Alkyl bromides are prepared from mixtures comprising aqueous hydrobromic acid and olefins in a process in which there is concentration of the aqueous hydrobromic acid present during the reaction.

Preparation of alkyl bromides from aqueous hydrobromic acid and olefins

A process for preparing alkyl 5-oxo-6-heptenoates of the formula I ##STR1## where X and Y are hydrogen or methyl, and R.sup.1 is C.sub.1 -C.sub.8 -alkyl, by

Preparation of alkyl 5-oxo-6-heptenoates, and novel intermediate for the

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Limburgerhof, Germany

Matthias Eiermann