Evonik Degussa Gmbh

Degussa Aktiengesellschaft

Bernd Günzel

Martin Roos

Georg Oenbrink

Ralf Meier

Axel Hengstermann

Jürgen Herwig

Alexander Richter

Jörg Lohmar

Vera Schiemann

Wilfried Uhlich

Stephan Schäflein

Bernd-Holger Modrow

Boris Jilg

The present invention provides a method for purifying laurolactam from a crude lactam mixture. In the method of the present invention, laurolactam is selectively crystallized by melt crystallization with controlled cooling of the crude lactam mixture.

Purification of a crude lactam mixture by means of melt crystallization

A process for preparing a polyarylene ether ketone, comprising:

Process for preparing polyarylene ether ketone

The epoxidation of cyclic, at least monounsaturated alkenes is conducted by a process, which comprises conducting the epoxidation of a cyclic, at least monounsaturated alkene in the presence of an oxidant in a reaction medium that contains at least 1% by weight of the saturated cyclic alkane corresponding to the cyclic, at least monounsaturated alkene. In a preferred embodiment the reaction medium contains at least 2.5% by weight of the saturated cyclic alkane corresponding to the cyclic, at least monounsaturated alkene.

Process for the epoxidation of cyclic alkenes

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Haltern am See, Germany

Bernd Günzel