Evonik Degussa Gmbh

Evonik Operations Gmbh

Evonik Industries Ag

Robert Jansen

Joerg-Joachim Nitz

Axel Hengstermann

Stephan Kohlstruk

Matthias Orschel

Markus Schwarz

Martin Maier

Anja Mueller

Manfred Kreczinski

Gerda Grund

Matthias Woyciechowski

Andreas Merkel

Jan Cassens

Armin Matthias Rix

Martina Ortelt

Christian Lettmann

Jörg-Joachim Nitz

Guido Streukens

Michael Demming

Cord Knoop

Jens Doering

Anja Müller

Juergen Lippe

Stephanie Bajus

Jens Döring

Markus Galle

Jan Caßens

Matthias Mendorf

Michael D Hinton

Rolf Hirsch

Norbert Richter

Andreas Hoff

Stephan Kohlstruck

Contaminated wastewater from the preparation of isophorone, isophoronenitrile and isophoronediamine is treated by A) 1. treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by alkaline hydrolysis of isophoronenitrile to isophorone, and the salts of hydrogen cyanide within a pH range of 12.0 to 13.7 and at temperatures of 60 to 200&#xb0; C. and 2. processing the wastewater from A) 1. by an oxidation, or B) treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by an oxidation, or C) processing the wastewater from A) 1. and the wastewater from the preparation of isophorone and/or the wastewater from the preparation of isophoronediamine by an oxidation.

Method for processing contaminated wastewater from the preparation of isophorone, isophoronenitrile and isophoronediamine

Contaminated wastewater from the preparation of isophorone, isophoronenitrile and isophoronediamine is treated by A) 1. treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by alkaline hydrolysis of isophoronenitrile to isophorone, and the salts of hydrogen cyanide within a pH range of 12.0 to 13.7 and at temperatures of 60 to 200&#xb0; C., and 2. processing the wastewater from A) 1. by an oxidation, or B) treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by an oxidation, or C) processing the wastewater from A) 1. and the wastewater from the preparation of isophorone and/or the wastewater from the preparation of isophoronediamine by an oxidation.

The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (&#x3b2;-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.

Catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (&#x3b2;-isophorone) with hydrogen peroxide to afford 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone)

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 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 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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Bottrop, Germany

Robert Jansen