Evonik Degussa Gmbh

Evonik Operations Gmbh

Daniel Demicoli

Martin Roos

Ralf Meier

Thomas Haas

Thomas Tacke

Jan Christoph Pfeffer

Luca Cameretti

Frank Erhardt

Andreas Pfennig

Anja Schubert

Marie-Dominique Przybylski-Freund

Franz-Erich Baumann

Harald Haeger

Axel Hengstermann

Markus Poetter

Horst Beyer

Florian Hermes

Markus Hartmann

Bernd Guenzel

Harald Häger

Hermann Van Laak

Rainer Göring

Markus Pötter

Alexander Richter

Lan De Gans Li

Frank Huebner

Norbert Kern

Fábio Gosi De Aquino

Christian Nörnberg

Marie-Dominique Przybylski

Markus Potter

Harald Hager

An improved process can be used for the acid hydrolysis of polylaurolactam with sulfuric acid. An especially suitable starting material is polylaurolactam which is intended for recycling and which is characterized by a low laurolactam content.

Process for acid hydrolysis of pure polylaurolactam

A pipe, the inner surface of which is lined with a thermoplastic layer, is produced by a process comprising the following steps: Relative movements between the metal pipe and inliner are thereby prevented; the inliner also has high safety against collapse. The pipe is used to produce a routed pipeline.

Method for producing a pipe lined with an inner liner

The present application relates to a process for removing an organic compound having one or more positive charges from an aqueous solution, comprising the steps a) provision of the aqueous solution comprising the organic compound and of a hydrophobic organic solution which comprises a liquid cation exchanger, where the liquid cation exchanger is hydrophobic, and where the liquid cation exchanger has one or more negative charges and an overall negative charge, b) contacting the aqueous solution and the organic solution, and c) separating off the organic solution from the aqueous solution.

Liquid cation exchanger

A process for removing a cyclododecanone-rich target fraction (A) from a dehydrogenation mixture (O) comprising low boilers (LB), cyclododecanone (CDON), medium boilers (MB), cyclododecanol (CDOL) and high boilers (HB) is provided. According to the process, substantially pure CDON is obtained via a distillative sequence of two side draw columns connected in series, wherein the sidestream of the primary side draw column is fed into the secondary side draw column. From the top of each of the two side draw columns, a CDON-rich fraction is drawn off, and these are combined to form a target fraction, which is essentially pure CDON.

Workup of a cyclododecanone cyclododecanol mixture in a sequence of side draw columns

The invention relates to a method for removing an organic compound having one or more positive charges from an aqueous solution. Said method consists of the following steps a) the aqueous solution containing the organic compound, and a hydrophobic organic solution which contains a hydrophobic liquid cation exchanger having one or more negative charges and a negative total charge, are provided, b) the aqueous solution and the organic solution are brought into contact with each other and c) the organic solution is separated from the aqueous solution.

A process for removing a cyclododecanone-rich fraction from a dehydrogenation mixture containing low boilers, cyclododecanone, medium boilers, cyclododecanol and high boilers is provided. According to the process, the cyclododecanone is separated from the cyclododecanol in a dividing wall column. The apparatus which is the dividing wall column is also provided within this invention.

Workup of a cyclododecanone cyclododecanol mixture in a dividing wall column

A process for purifying laurolactam by means of integrated connection of distillation and crystallization is provided. The crystallization is performed as a solution or melt crystallization. The process reduces thermal stress applied to the laurolactam stream and improved yields are obtained. Raw materials are recovered and recycled in the production sequence.

Method for isolation of laurolactam from a laurolactam synthesis process stream

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Essen, Germany

Daniel Demicoli