Evonik Degussa Gmbh

Evonik Industries Ag

Joerg-Joachim Nitz

Robert Jansen

Axel Hengstermann

Gerda Grund

Matthias Orschel

Markus Schwarz

Stephan Kohlstruk

Martin Maier

Andreas Merkel

Anja Mueller

Jan Cassens

Armin Matthias Rix

Martina Ortelt

Christian Lettmann

Guido Streukens

Michael Demming

Franz Ulrich Becker

Cord Knoop

Jens Doering

Matthias Mendorf

Juergen Lippe

Markus Galle

Michael D Hinton

Rolf Hirsch

Norbert Richter

Andreas Hoff

Patrick Stier

The present invention relates to the fine purification of isophoronenitrile (IPN) by melt crystallization.

Fine purification of isophoronenitrile by melt crystallization

Cations are removed from a substance stream that is produced during the production of isophoronenitrile with the help of a cation exchanger.

Process for removing cations from an isophoronenitrile product mixture

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

A process for preparing isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) is provided wherein distillation vapors from the work-up of product fractions are recycled to earlier stages of operation of the process.

Hydrolysis of the residues obtained in the production of isophorone to recover isophorone and acetone

The invention relates to a method for producing a low-molecular-weight organic compound, such as acetone, butanol, and ethanol, in a fermentation process. The method contains a step of introducing a gas flow into an aqueous solution containing microorganisms producing the low-molecular-weight organic compound; a step of recovering the gas flow through a compound comprising isophoron; and optionally a step of separating the low-molecular-weight organic compound from the composition comprising isophoron.

Fermentation process for production of acetone, butanol and ethanol using isophoron as absorbent

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

Growing community of inventors

Essen, Germany

Joerg-Joachim Nitz