Evonik Degussa Gmbh

Evonik Industries Ag

Evonik Operations Gmbh

Markus Schwarz

Joerg-Joachim Nitz

Gerda Grund

Matthias Orschel

Robert Jansen

Martin Maier

Robert Franke

Dirk Fridag

Katrin Marie Dyballa

Axel Hengstermann

Dieter Hess

Frank Geilen

Armin Matthias Rix

Martina Ortelt

Hans-Gerd Lueken

Matthias Seiler

Friedrich Georg Schmidt

Bart Hamers

Christian Lettmann

Stefan Bernhardt

Jörg-Joachim Nitz

Uwe Ernst

Guido Streukens

Werner Freitag

Cord Knoop

Hermann-Josef Schulte-Althoff

Andreas Merkel

Walter Sterzel

Markus Galle

Juergen Lippe

Julien Couet

Michael D Hinton

Rolf Hirsch

Norbert Richter

The production of 2-propylheptanol described here is effected via Rh-catalyzed hydroformylation of C-olefin to afford C-aldehyde, aldol condensation to afford the C-aldehyde and hydrogenation to afford the C-alcohol. The emphasis is on the hydroformylation and the ligand employed therein. The problem addressed by the invention is that of reducing the costs of 2PH production. This problem is solved when a cheaper catalyst system which simultaneously achieves a better regioselectivity is employed in the hydroformylation. This catalyst system contains rhodium as the central atom and is complexed with the ligand (1): 

Economical production of 2-propylheptanol

The invention relates to a process for preparing aldehydes having five carbon atoms, in which an input mixture containing 10% by weight to 50% by weight of linear butenes and less than 5% by weight of 1-butene is hydroformylated with synthesis gas in the presence of a catalyst system comprising rhodium and at least one bisphosphite ligand, wherein the hydroformylation is effected in a reactor from which, over an operating period, a cycle gas containing at least a portion of the products and unconverted reactants from the hydroformylation is continuously drawn off and partly condensed, and uncondensed components of the cycle gas are recycled into the reactor, and wherein, after the operating period has expired, the hydroformylation is stopped, the reactor is freed of reaction residues and the hydroformylation is restarted. It is based on the problem of making such a process more economically viable. The problem is solved by using a bisphosphite of the formula (1) and/or (2) as ligand, extending the operating period to more than 8000 h, and not separating solid reaction residues out of the reactor during the course of the operating period.

Stable long-term method for producing C5-aldehydes

The present invention refers to the preparation of 3-cyano-3,5,5-trimethylcyclohexanone (isophorone nitrile, abbreviation IPN) using a calcium alkoxide, particularly calcium ethoxide, as catalyst.

Process for preparing 3-cyano-3,5,5-trimethylcyclohexanone

The invention relates to an improved process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine, referred to hereinafter as isophoronediamine or, in abbreviated form, IPDA, by: I. preparation of isophorone by catalyzed aldol condensations with acetone as reactant; II. reaction of isophorone with HCN to form isophoronenitrile (IPN, 3-cyano-3,5,5-trimethylcyclohexanone); III. catalytic hydrogenation and/or catalytic reductive amination (also referred to as aminative hydrogenation) of 3-cyano-3,5,5-trimethylcyclohexanone, hereinafter called isophoronenitrile or, in abbreviated form, IPN, to give the isophoronediamine.

Process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine

The invention relates to a method for producing isophorone by catalyzed aldol condensation of acetone as an educt, reprocessing the reaction product, hydrolyzing the product stream, and separating into an organic and an aqueous fraction, obtaining isophorone from the organic fraction, distillatively reprocessing the aqueous fraction, and feeding the vapors from the head of the distillative reprocessing apparatus into the hydrolysis apparatus.

Method for producing isophorone

The invention relates to a process for preparing isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) in the presence of at least one defoamer in the wastewater column in the workup section.

Process for preparing isophorone in the presence of at least one defoamer in the wastewater column in the workup section

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Haltern am See, Germany

Markus Schwarz