Evonik Degussa Gmbh

Evonik Rohm Gmbh

Frederik Gluth

Steffen Krill

Torsten Balduf

Ralf Meier

Rudolf Burghardt

Markus Priske

Gerhard Koelbl

Kévin Micoine

Peter Kreis

Gerhard Kölbl

A homogeneous catalyst system is removed from a reaction mixture of two liquid phases by separating the two liquid phases with a membrane having at least one separation-active layer in such a way that the homogeneous catalyst system is at least partially concentrated in a membrane retentate; wherein the reaction mixture contains at least one partially epoxidized cyclic unsaturated compound having twelve carbon atoms; and wherein the membrane separation-active layer contains crosslinked a silicone acrylate and/or polydimethylsiloxane and/or polyimide.

Membrane-supported catalyst removal in the epoxidation of cyclic unsaturated C12 compounds, for example cyclododecene (CDEN)

The present invention concerns regulating the water content in a process for production of methacrolein. Methacrolein is used in chemical synthesis particularly as an intermediate for production of methacrylic acid, methyl methacrylate or else of active, aroma or flavor chemicals. The present invention is particularly concerned with regulating the water content in a process for production of methacrolein from formaldehyde and propionaldehyde via a Mannich condensation.

Method of regulating the water content in a continuous method for producing methacrolein

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Düsseldorf, Germany

Frederik Gluth