Evonik Degussa Gmbh

Evonik Fibres Gmbh

Evonik Operations Gmbh

Evonik Oxenc Gmbh

Evonik Oxeno Gmbh

Goetz Baumgarten

Markus Priske

Markus Ungerank

Guido Stochniol

Alfred Kaizik

Klaus-Diether Wiese

Martin Roos

Franz-Felix Kuppinger

Roland Wursche

Hans-Gerd Lueken

Marina Lazar

Robert Franke

Dirk Fridag

Michael Ferenz

Dieter Hess

Michael Grass

Wolfgang Lortz

Wilfried Bueschken

Cornelia Borgmann

Markus Winterberg

Peter Schwab

Martin Trocha

Jürgen Herwig

Bart Hamers

Nicole Brausch

Uwe Ernst

Dagmara Ortmann

Stephan Houbrechts

Peter Kreis

Michael Kroell

Hardi Doehler

Oliver Moeller

Rene Haensel

Harald Roegl

Michael Graβ

Patrick Muhlack

Yuecel Oenal

Stephan Schaeflein

Rolf Augenstein

Peter Seidensticker

Christian Schnitzer

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 polyimide membranes and to a phase inversion method for the production thereof. The polyimide membranes can be used to separate different gas mixtures.

Polyimide membranes made of polymerization solutions

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

The invention relates to a method for producing a product mixture () by means of the technical hydroformylation of a hydrocarbon stream () that contains isobutene, and for separating the product mixture () that is obtained, as well as to a device for the claimed method and to the use of a claimed device. The problem addressed thereby is that of providing a method and an associated device that allow the amount of high-boiling substances in the product mixture () to be kept as low as possible and thus the yield of the reaction to be increased. The problem is solved by the use of a nano-filtration device (M) for separating the catalyst from the product mixture (), said device having especially high permeability to 3-methylbutanoic acid.

Method and device for the hydroformylation of isobutene and for the separation of the product mixture

The invention relates to a specific apparatus, more particularly a chain of gas separation membrane modules, for separation of gas mixtures into two fractions each of elevated purity.

Process for separation of gases

The invention relates to a method for enriching a homogenous catalyst from a process flow comprising said homogenous catalyst as a component, wherein the process flow is conducted over at least one membrane and wherein the membrane wholly or partially comprises a polymer that has planar polymer units connected to one another via a rigid link and wherein the linker is contorted, such that at least one planar polymer unit is connected to at least one second planar polymer unit via the link, in a non-co-planar arrangement. The invention furthermore relates to a method for producing tridecanal.

Method for enriching a homogeneous catalyst from a process flow

The present invention relates to a process for purifying low molecular weight hydridosilane solutions, in which a solution to be purified comprising a) at least one low molecular weight hydridosilane, b) at least one solvent and c) at least one impurity selected from the group of the compounds having at least 20 silicon atoms and/or the group of the homogeneous catalyst systems is subjected to a crossflow membrane process with at least one membrane separation step using a permeation membrane.

Process for purifying low molecular weight hydridosilanes

A method of fractionating a dispersion of oxidic nanoparticles wherein at least one step of the method is a membrane crossflow filtration step, the flow of the dispersion over the membrane being brought about by means of driven rotating parts; and dispersions of oxidic nanoparticles that are obtainable by the method.

Method of fractionating oxidic nanoparticles by crossflow membrane filtration

The invention relates to a method for producing acrolein by dehydrating an aqueous glycerin phase in an acrolein reaction region, obtaining an aqueous acrolein reaction phase; at least partially separating the aqueous acrolein reaction phase into an acrolein-rich acrolein phase and an acrolein-poor residual phase comprising glycerin, water and various other residuals; and recirculating at least part of the residual phase into the acrolein reaction region. Additionally, removing at least one of the residuals, other than glycerin or water, from either of the glycerin phase or a mixture phase obtained by mixing the glycerol phase with the low-acrolein residue phase and feeding the resulting purified glycerin or mixture phase into the acrolein reaction region. The invention furthermore relates to a method for producing acrylic acid, water-absorbing polymer formations, compounds and hygiene articles, and to devices for carrying out those methods.

Method for producing acrolein comprising the regeneration of a raw glycerin phase

Process for separating a dissolved complex catalyst of a metal of group 4, 5, 6, 7, 8, 9 or 10 of the Periodic Table of the Elements and/or any free organophosphorus ligand present from a nonaqueous hydroformylation reaction mixture which contains an aldehyde product and an organic solvent at least one membrane which is more permeable to the hydroformylation product than to the organophosphorus ligand, the separation being carried out under a carbon monoxide partial vapor pressure of more than 200 kPa.

Method for separating organic transition metal complex catalysts

The invention relates to a plant for carrying out chemical reactions, having a reactor (), the reaction space of which contains hydrogen peroxide (HO) and titanium silicalite (TS-1). The object of the invention is to improve such a plant such that continuous separation and recycling of the active catalyst to the reaction space is possible with a long filter service life. This is achieved in that the reaction space contains a solid silicon source, in that the plant comprises a water takeoff line () which is set up for drawing off water in addition to components which are dissolved and/or dispersed therein from the reaction space, in that the water takeoff line () leads to a filter () which separates off the components which are dissolved and/or dispersed in the water, and in that the plant has a return line () which is set up for recirculating to the reaction space components which are separated off by means of the filter ().

Reactor having titanium silicate recycling

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Haltern am See, Germany

Goetz Baumgarten