Evonik Degussa Gmbh

Evonik Industries Ag

Matthias Mendorf

Stephan Kohlstruk

Axel Hengstermann

Matthias Orschel

Anne Rittsteiger

Alexander Martin Rüfer

Jörg-Joachim Nitz

Robert Jansen

Joerg-Joachim Nitz

Guido Streukens

Michael Demming

Anja Mueller

Andreas Merkel

Jens Doering

Jens Döring

Anja Müller

Andreas Hoff

Jorn Walscharts

A process for fine purification of isophoronediamine (IPDA), including producing IPDA by aminating hydrogenation of isophorone nitrile in the presence of at least ammonia, hydrogen, a a hydrogenation catalyst and optionally further additions to obtain a crude IPDA, and subjecting the crude IPDA to a fine purification via two vacuum distillation columns, wherein in the first vacuum distillation column the removal of any remaining relatively low-boiling byproducts is effected and in the second vacuum distillation column the IPDA is obtained in pure form as tops and thus separated from the organic residues, and wherein the first vacuum distillation column has vacuum distillation column has a partial condenser fitted to it.

Coupling of distillative purification with a partial condenser for pre-purification of isophoronediamine

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

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Dortmund, Germany

Matthias Mendorf