Evonik Degussa Gmbh

Evonik Operations Gmbh

Marina Lazar

Robert Franke

Dirk Fridag

Katrin Marie Dyballa

Michael Ferenz

Guido Stochniol

Martin Roos

Georg Borchers

Roland Wursche

Hans-Jurgen Kohle

Peter Schwab

Bernd Jaeger

Holger Wiederhold

Goetz Baumgarten

Markus Priske

Jürgen Herwig

Hans-Jürgen Köhle

David Bolz

Markus Ungerank

Marc Becker

Peter Kreis

Rene Haensel

Hardi Doehler

Sebastian Imm

Jens Hildebrand

Hanna Hahn

Georg Friedrich Thiele

Brigitte Mess

Christian Schnitzer

Peter Seidensticker

Malte Fischer

Hubert MÜLLER

Andree Blesgen

Jörg RÖDER

Natalia Hinrichs-Tontrup

A process has the ability to produce polyalkenamer-containing compositions. Stages of the process include converting at least one cycloalkene by ring-opening metathetic polymerization to obtain a polyalkenamer-containing product mixture, and working up the product mixture to remove at least one of a monomer and an oligomer of the at least one cycloalkene to obtain the polyalkenamer-containing composition. The working up stage is effected by a diafiltration.

Process for preparing polyalkenamers for packaging applications

The invention relates to processes for preparing aldehydes by hydroformylation of alkenes, in which an alkene-containing feed mixture is subjected to a primary hydroformylation with synthesis gas in the presence of a homogeneous catalyst system, the primary hydroformylation being effected in a primary reaction zone from which a cycle gas containing at least some of the products and unconverted reactants of the primary hydroformylation are drawn off continuously and partly condensed, with recycling of uncondensed components of the cycle gas into the primary reaction zone, and with distillative separation of condensed components of the cycle gas in an aldehyde removal stage to give an aldehyde-rich mixture and a low-aldehyde mixture. The problem that it addresses is that of developing the process such that it achieves high conversions and affords aldehyde in good product quality even in the case of a deteriorating raw material position. More particularly, a solution is to be found for making legacy oxo process plants capable of utilizing lower-value raw material sources. This problem is solved by separating the low-aldehyde mixture into a retentate and a permeate by means of a membrane separation unit in such a way that alkenes present in the low-aldehyde mixture become enriched in the permeate, while alkanes present in the low-aldehyde mixture become enriched in the retentate. The alkene-rich permeate is then transferred into a secondary reaction zone and subjected to a secondary hydroformylation therein with synthesis gas in the presence of an SILP catalyst system. The reaction product obtained from the secondary hydroformylation is recycled into the aldehyde removal stage.

Two-stage hydroformylation process with circulating gas and SILP technology

Composite membrane having a separating membrane layer characterized in that a separating membrane layer is produced by curing laterally modified silicone acrylates of the general Formula I 

Composite silicone membranes of high separation efficiency

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Hasselroth, Germany

Marina Lazar