Bayer Materialscience Ag

Bayer Aktiengesellschaft

Covestro Deutschland Ag

Bayer Intellectual Property Gmbh

Uhdenora S.p.a.

Covestro Intellectual Property Gmbh & Co. Kg

Solarworld Aktiengesellschaft

Thyssenkrupp Uhde Chlorine Engineers (italia) S.r.l.

Covestro Ag

Messer Group Gmbh

Covestro Duetschland Ag

Nanox Corporation

Thyssenkrupp Uhde Chlorine Engineers Gmbh

Messer Austria Gmbh

Thyssenkrupp Uhde Chlorine Engineers S.r.l.

Andreas Bulan

Rainer Weber

Fritz Gestermann

Jürgen Kintrup

Pieter Ooms

Hans-Dieter Pinter

Johann Rechner

Peter Woltering

Randolf Kiefer

Johan Vanden Eynde

Marc Buts

Norbert Schmitz

Hans-Dieter Block

Hans-Heinrich Moretto

Michael Traving

Peter Weuta

Joachim Herzig

G&uuml;nter Lailach

Gerd Speer

Walter Hansen

Walter Klesper

Michael Grossholz

Leslaw Mleczko

Juliane Meese-Marktscheffel

Wolfgang Lorenz

Berthold Keggenhoff

Gunter Lailach

Stefan Sepeur

Volker Michele

Sigurd Buchholz

Fritz Pohl

Richard Adamson

Jan Heijl

Sven Albrecht

Stefanie Eiden

Dieter Heinz

Imad Moussallem

Peter Fabian

Gregor Polcyn

Rolf Hempelmann

Michael Batz

Matthias Böhm

Harald Natter

Norbert Wagner

Gerald Frenzer

Richard Malchow

Hans-Joachim Brockhaus

Friedhelm Kämper

Michael Groβholz

Juergen Hecke

Frank Gross

Wolfgang Kern

Martin Leipnitz

Christoph Erdmann

Jens Aβmann

Juergen Kintrup

Elin Hammarberg

Manfred Marre

Torsten Sill

Yuliya Schießer

Peter Strabel

Klaus Esch

Kasper Hallenberger

Helmut Lochhaas

G&uuml;nter Buss

Gunter Buss

Michael Krancher

Zbigniew Muziol

Hartmut Schlecker

Yuliya Schiesser

Michael Großholz

Rolf Spatz

Hermann-Jens Womelsdorf

Lisa Rossrucker

Thomas Turek

Michael Marx

Armin Obrich

Bernd Henning

Walter Bachleitner

Joachim Rohovec

Mathias Weis

Ruiyong Chen

Vinh Trieu

Alexander Karpenko

Christian Six

Gerhard Moormann

Peter Schulz

Mohamed Saysay

Tobias Mohn

Thorben Muddemann

Jens Aßmann

Wolgang Lorenz

The invention relates to a method for producing isocyanates and optionally polyurethanes by at least: synthesising () phosgene () from carbon monoxide () and chlorine (); reacting () phosgene () with diamines () to form diisocyanates () and hydrogen chloride (); providing a carbon dioxide gas flow (); and cleaning () the carbon dioxide gas flow () of additional components, wherein the carbon dioxide is converted by means of an RWGS reaction () to form carbon monoxide () and hydrogen (), which are used as raw materials for the polyurethane production, as well as optionally reacting () the diisocyanates () with polyether polyol () and/or polyester polyol () to form polyurethanes ().

Method for isocyanate and polyurethane production with improved sustainability

The invention relates to a method for recycling polyurethane material waste () for producing chemical feedstock for the production of isocyanates () and then polyurethanes (), in which method, proceeding from polyurethane material waste (), carbon dioxide () and hydrocarbons () are generated by pyrolysis (), the carbon dioxide () is converted by electrolysis () into carbon monoxide () and hydrogen (), as appropriate, the carbon monoxide () obtained is converted via phosgene to isocyanate () and the isocyanate () can be further processed into new polyurethane material ().

Method for the recycling of polyurethane material waste for producing chemical feedstock for the production of isocyanates and polyurethanes

Method for the gastight and liquid-tight installation of oxygen consuming electrodes in an electrolysis apparatus, and electrolysis apparatus for use in chloralkali electrolysis, in which particular regions are covered with an additional film having a composition comparable to the oxygen-consuming electrodes.

Method for mounting oxygen-consuming electrodes in electrochemical cells and electrochemical cells

The invention relates to a method for flexibly controlling the use of hydrochloric acid having an HCl concentration of at least 10 wt %, in particular at a volume flow rate of at least 1 m/h, obtained from a continuous chemical production process (A). In the method, purified hydrochloric acid () from a hydrochloric acid store (E) is optionally fed to a dispatch station (H), an HCl electrolysis station (F) and a chloralkali electrolysis station (L), which are consumption points for the hydrochloric acid, or to a neutralisation station (G) in that if one or more of said consumption points (H, F, L) is not available or if there are bottlenecks at the consumption points (H, F, L), the hydrochloric acid () is fed to the neutralisation station (G) and neutralised with concentrated alkali solution (), in particular with concentrated sodium hydroxide solution, and the resulting salt solution () is fed either to the chloralkali process station (L) or to a disposal station (M).

Method for flexibly controlling the use of hydrochloric acid from chemical production

The invention describes a process for the manufacture of a gas diffusion electrode involving preparing a powder mixture containing at least a catalyst and a binder, applying the powder mixture to an electrically conducting support, and pressing the powder mixture with the electrically conducting support.

Process for the manufacture of gas diffusion electrodes

The invention relates to an oxygen-consuming electrode, in particular for use in chloralkali electrolysis, comprising a novel catalyst coating based on carbon nanotubes and a silver-based cocatalyst, and to an electrolysis device. The invention further relates to a method for producing said oxygen-consuming electrode and to the use thereof in chloralkali electrolysis or fuel cell technology.

Oxygen-consuming electrode and method for producing same

Described is an osmotic distillation process for concentrating a liquid containing sodium chloride, and in particular a treatment process for used reaction water containing sodium chloride from the production of polymers.

Osmotic distillation process for concentrating a liquid containing sodium chloride

The present invention relates to a gas diffusion electrode that includes an electrically conductive carrier, and a porous coating based on an electrochemically active catalyst and a hydrophobic material, wherein the electrode has a first side facing an oxygen-containing gas and a second side facing an alkaline electrolyte, wherein the catalyst comprises a noble metal as a catalytically active component, wherein the hydrophobic material comprises a hydrophobic polymer, and wherein the coating comprising the catalyst has a pore volume from 10 to 500 mm/g, and a pore diameter in the range from 100 to 10,000 nm.

Gas diffusion electrode and process for production thereof

An oxygen-consuming electrode, in particular for use in chloralkali electrolysis, having a novel catalyst coating and also an electrolysis apparatus are described. Furthermore, its use in chloralkali electrolysis, fuel cell technology or metal/air batteries is described. The oxygen-consuming electrode comprises at least a support which in particular is electrically conductive, a layer containing a catalyst and a hydrophobic layer, characterized in that it contains gallium in addition to silver as catalytically active component.

A gas diffusion electrode is described, especially for use in chloralkali electrolysis, said gas diffusion electrode having finely divided components on the liquid side. The electrode is notable for a low perviosity to gases and a lower operating voltage.

Gas diffusion electrodes and process for production thereof

Electrocatalyst, electrode coating and an electrode for preparing chlorine and process for producing the electrode, the electrocatalyst comprising a noble metal oxide and/or a noble metal of transition groups VIIIa of the Periodic Table of the Elements and at least one finely divided pulverulent oxide of another metal, in which one or more components are doped and the base metal oxide powder is chemically stable in the presence of aqueous electrolytes.

Electrocatalyst, electrode coating and electrode for the preparation of chlorine

The invention relates to an electrochemical cell comprising an anode and a cathode compartments separated by a membrane, having corresponding electrodes; said anode and cathode compartments each having an external wall, flanged areas designed like frames in the contact area of the compartments, and a gas diffusion electrode comprising a liquid-permeable carrier coated with a catalyst material; said gas diffusion electrode featuring an area not coated with catalyst at its bottom edge, said area, at the bottom end of the electrochemical cell, protruding between the flanged areas of the external wall of the cathode compartment and the flanged areas of the external wall of the anode compartment in the contact area of the compartments; a porous material arranged parallel between the gas diffusion electrode and the membrane, and devices for the supply and discharge of gas and electrolyte, with a gas space separated from an electrolyte space by appropriate means.

Alternative installation of a gas diffusion electrode in an electrochemical cell having percolator technology

The invention relates to an electrochemical cell comprising an anode and a cathode compartment separated by a membrane, housing corresponding electrodes. The anode and the cathode compartments having external walls with frame-type flanged areas in the contact area of both compartments. The flanged areas having mounting bores marking an inner area and an outer area of the electrochemical cell a, gas-diffusion electrode resting on a support system, a porous material resting on the gas-diffusion electrode, and devices for the inlet and outlet of gas and electrolyte. At least one circumferential gasket frame is in the contact area of both compartments, between the frame-type flanged areas of the external walls of both compartments, said gasket resting on the membrane, with the porous material and the gas-diffusion electrode resting on the frame-type cathodic flanged area and the circumferential gasket frame overlapping in this area with the porous material and the gas-diffusion electrode.

Electrochemical cell having a frame seal for alternative sealing against marginal leakages of the electrolyte

Processes for the production of chlorine by multi-stage oxidation, for example, by thermal reaction of hydrogen chloride with oxygen using catalysts or by non-thermal activated reaction of hydrogen chloride with oxygen, in which the gas mixture formed in the reaction, comprising the target products chlorine and water, unreacted hydrogen chloride and oxygen, and possibly other secondary constituents, such as carbon dioxide and nitrogen, (a) is cooled to condense hydrochloric acid as an aqueous solution of hydrogen chloride and (b) the aqueous solution of hydrogen chloride formed is separated from the gas mixture, characterised in that (c) the separated aqueous solution of hydrogen chloride is fed at least partially to an electrochemical oxidation in which at least part of the hydrogen chloride is oxidised to chlorine, (d) the chlorine gas occurring in step d) is optionally added to the gas mixture occurring in step c), (e) the residues of water present in the gas mixture from steps c) and e), in particular by washing with sulfuric acid, are removed, (f) the chlorine-rich gas mixture forming is freed of oxygen and optionally of secondary constituents.

Processes for the production of chlorine from hydrogen chloride and oxygen

The present invention relates to a method of operating an oxygen-consuming electrode as cathode for the electrolysis of alkali metal chlorides or hydrochloric acid, in an electrochemical cell, comprising feeding an oxygen-containing process gas to the electrode, wherein the oxygen-containing process gas is at least partly heated using a heat source from the electrolysis before contact with the oxygen-consuming electrode to a temperature which corresponds to not more than the temperature of the cathode space in the cell or is less than 50&#xb0; C. below the temperature of the cathode space in the cell.

Method of operating an oxygen-consuming electrode

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Langenfeld, Germany

Andreas Bulan