Bayer Aktiengesellschaft

Bayer Materialscience Ag

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Solarworld Aktiengesellschaft

Uhdenora S.p.a.

Ge Bayer Silicones Gmbh & Co. Kg

Covestro Ag

Thyssenkrupp Uhde Chlorine Engineers S.r.l.

Rainer Weber

Andreas Bulan

Hans-Dieter Block

Norbert Lonhoff

Hans-Heinrich Moretto

Helmut Klotz

Johann Rechner

Klaus Pohmer

Pieter Ooms

Jürgen Kintrup

Hans D Pinter

Bernhard Spreckelmeyer

Leslaw Mleczko

Johan Vanden Eynde

Peter Woltering

Randolf Kiefer

Marc Buts

Michael Batz

Michael Traving

Rainer Bellinghausen

Uwe Arndt

Bernd Rosenow

Heinrich Helker

Hans Rinkes

Ludwig Schmidt

Aurel Wolf

Heike Heckroth

Ottfried Schlak

Juliane Meese-Marktscheffel

Fritz Gestermann

Wolfgang Lorenz

Siegfried R Waldvogel

Berthold Keggenhoff

Bruno Degen

Volker Michele

Sigurd Buchholz

Gebhard Wagner

Fritz Pohl

Hans-Dieter Pinter

Richard Adamson

Jan Heijl

Jost Halstenberg

Sven Albrecht

Knud Werner

Johannes-Peter Schäfer

Rolf Hempelmann

Wolfgang Ohlendorf

Hans-Joachim Leimkühler

Matthias Böhm

Harald Natter

Matthias-Sven Steiner

Christoph Herwig

Gerd Speer

Sebastian Hasenstab-Riedel

Bernd Makowka

Jens Assmann

Hans-Georg Nieder-Vahrenholz

Frank Rauscher

Simon Steinhauer

Elmar Bramer-Weger

Hans-Joachim Brockhaus

Karlheinz Stachulla

Friedhelm Kämper

Cornelia Dorzbach-Lange

Juergen Hecke

Richard Malchow

Wolfgang Kern

Michael Grossholz

Martin Leipnitz

Nicole Mahler

Bernd Henning

Helmut Lochhaas

Rolf Spatz

Hermann-Jens Womelsdorf

Zbigniew Muziol

Armin Obrich

Hartmut Schlecker

Cornelia Dorzhach-Lange

Yuliya Schießer

Matthias Weis

Ruiyong Chen

Reinhard Haida

Vinh Trieu

Wolfgang Schneider

Manfred Wienand

Cornelia Do/ rzbach-Lange

Paul Strehlow

Christian Six

Yuliya Schiesser

Gerhard Langstein

Maxime Paven

Gerhard Moormann

Nico Schwarze

Michael Lumm

Roland-Luiz Roth

Dawie Van Der Merre

Dietmar Schwanke

Torsten Sill

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

The invention relates to a storage medium and to a method for using a storage medium based on ionic compounds, which can reversibly absorb and store chlorine and chlorine from process gases, and which can release the same again by changing the ambient conditions, wherein the storage medium can be reused for this task after discharge.

Storage medium and method for separating, storing and transporting chlorine from chlorine-containing gases

The present invention relates to an aqueous composition comprising cells of at least one strain of a halophilic microorganism, and alkali sulfate in a concentration of at least 30 g/l based on the total volume of the aqueous composition. The present invention further relates to a method for treating a waste water, comprising obtaining or providing a waste water, contacting said waste water with cells of at least one strain of a halophilic microorganism, and thereby generating an aqueous composition comprising alkali sulfate in a concentration of at least 30 g/l, and incubating said aqueous composition under conditions which allow for the treatment of the waste water.

Recycling of alkali sulfate rich waste water by biological pre-treatment with an extreme halophilic organism

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

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

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 invention relates to a method for improving the performance of nickel electrodes in alkali chloride electrolysis by adding water-soluble platinum compounds to the catolyte.

Method for improving the performance of nickel electrodes

Processes for electrolysis of alkali metal chlorides with oxygen-consuming electrodes having startup and shutdown conditions which prevent damage to the constituents of the electrolysis cell.

Process for electrolysis of alkali metal chlorides with oxygen-consuming electrodes

An oxygen-consuming electrode is described, more particularly for use in chloralkali electrolysis, comprising a novel catalyst coating based on silver and a finely divided silver oxide, as is an electrolysis apparatus. Also described is a production process for the oxygen-consuming electrode and the use thereof in chloralkali electrolysis or fuel cell technology.

Oxygen-consuming electrode and process for the production thereof

Electrolyzer comprising at least one single electrolyzer element which comprises at least one anode compartment with an anode, one cathode compartment with a cathode and one ion exchange membrane arranged between the anode and the cathode compartments, with the anode and/or cathode being a gas diffusion electrode. A gap is provided between the gas diffusion electrode and the ion exchange membrane, with an electrolyte inlet arranged at the upper end of the gap and an electrolyte outlet at the lower end of the gap and a gas inlet and a gas outlet. The electrolyte outlet extending into a discharge header, and the electrolyte inlet connected to an electrolyte feed tank and having an overflow, the overflow connected to the discharge header, with a coiled hose connecting the electrolyte feed tank with the electrolyte inlet and with a coiled hose connecting the overflow with the discharge header.

Electrolyser with coiled inlet hose

A process for preparing diaryl carbonate and utilizing at least part of the process wastewater by increasing the concentration of the wastewater phases containing sodium chloride for the electrolysis by means of osmotic membrane distillation with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the diaryl carbonate production process (diphenyl carbonate process) is described.

Process for preparing diaryl carbonate

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Odenthal, Germany

Rainer Weber