Patent application number | Description | Published |
20080257749 | Method For Improving The Performance of Nickel Electrodes - 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. | 10-23-2008 |
20080296153 | ELECTROCHEMICAL HALF-CELL - The present invention describes an electrochemical half-cell, comprising a gas space, an electrolyte space and a gas diffusion electrode in the form of a cathode or anode. The gas diffusion electrode separates the gas space from the electrolyte space and comprises an electrically conductive substrate and an electrochemically active coating. The gas diffusion electrode includes a coating-free edge region and is connected to a support structure in the coating-free edge region via an electrically conductive plate, which covers at least the coating-free edge region as well as a coated edge region. | 12-04-2008 |
20090166180 | PROCESS FOR PRODUCING ISOCYANATES - An isocyanate is produced by: | 07-02-2009 |
20090173636 | PROCESS FOR PRODUCTION OF DIARYL CARBONATE - The invention relates to a process for production of diaryl carbonate combined with the electrolysis of the resultant alkali metal chloride-containing process wastewater. The process according to the invention makes possible, inter alia, improved utilization in electrolysis of the alkali metal chloride-containing solution obtained in the production of diaryl carbonate. | 07-09-2009 |
20090215977 | PROCESS FOR THE PREPARATION OF POLYCARBONATE - The invention relates to a combined process for the preparation of polycarbonate by the phase boundary process and downstream electrolysis of sodium chloride-containing process wastewater. | 08-27-2009 |
20090240076 | PROCESS FOR PREPARING METHYLENEDIPHENYL DIISOCYANATES - The invention relates to a process for preparing methylenediphenyl diisocyanates which comprises at least the steps: A) reaction of aniline with formaldehyde in the presence of hydrochloric acid as catalyst to give a mixture of diamines and polyamines of the diphenylmethane series (MDA) and subsequent at least partial neutralization of the hydrochloric acid by means of alkali metal hydroxide, B) reaction of the mixture of diamines and polyamines of the diphenylmethane series obtained in step A) with phosgene to give a mixture of diisocyanates and polyisocyanates of the diphenylmethane series (MDI) and hydrogen chloride, wherein C) the hydrochloric acid which has been neutralized in step A) is separated off in the form of a solution containing alkali metal chloride and is subsequently at least partly fed to an electrochemical oxidation to form chlorine, alkali metal hydroxide and optionally hydrogen and D) at least part of the chlorine produced in step C) is used for preparing the phosgene used in step B). | 09-24-2009 |
20100010256 | PROCESSES FOR HYDROGEN CHLORIDE OXIDATION USING OXYGEN - Processes which include: (a) providing a gas phase comprising hydrogen chloride; (b) oxidizing the hydrogen chloride in a reactor to form a product gas comprising chlorine, unreacted hydrogen chloride and water, the reactor having structural parts with inner surfaces that are contacted during oxidation by one or both of the gas phase and the product gas; (c) cooling the process gas; (d) separating the unreacted hydrogen chloride and water from the product gas; (e) drying the product gas; and (f) separating the chlorine from the product gas; wherein the inner surfaces of the reactor structural parts that are contacted during oxidation by one or both of the gas phase and the product gas are comprised of a nickel material having a nickel content of at least 60 wt. %, are described. | 01-14-2010 |
20100286431 | PROCESS FOR PREPARING DIARYL CARBONATE - 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. | 11-11-2010 |
20100324256 | PROCESS FOR PRODUCING POLYCARBONATE - A process is described for producing polycarbonate and utilizing at least some of the process waste water by concentrating the sodium chloride-containing waste water phases for the electrolysis using osmotic membrane distillation, if appropriate with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the polycarbonate production process. | 12-23-2010 |
20110009592 | PROCESS FOR THE PREPARATION OF POLYCARBONATE - A combined process for the preparation of polycarbonate from bisphenols and diaryl carbonates, the monophenol liberated being reacted again for the preparation of the diaryl carbonate and the alkali metal halide forming in the preparation of the diaryl carbonate being converted by electrochemical oxidation, optionally over a gas diffusion electrode, into chlorine and alkali hydroxide solution, the chlorine being recycled into the preparation of the phosgene and the alkali hydroxide solution being recycled into the preparation of the diaryl carbonate. | 01-13-2011 |
20110024289 | ELECTRODE AND ELECTRODE COATING - The invention describes an electrode and an electrode coating which are based on a catalyst containing finely divided carbon modifications and noble metal (oxide)s. | 02-03-2011 |
20110073491 | ELECTROCHEMICAL CELL - The present invention describes an electrochemical cell, comprising at least an anode half-cell with an anode, a cathode half-cell with a cathode, and an ion exchange membrane arranged between the anode half-cell and the cathode half-cell, the anode and/or the cathode is a gas diffusion electrode. And a gap is provided between the gas diffusion electrode and the ion exchange membrane, and the half-cell with the gas diffusion electrode has an electrolyte feed and an electrolyte discharge as well as a gas inlet and a gas outlet. The electrochemical cell preferably has an electrolyte feed that is hermetically connected to the gap. | 03-31-2011 |
20110147229 | PROCESS FOR PRODUCTION OF DIARYL CARBONATE - The invention relates to a process for production of diaryl carbonate combined with the electrolysis of the resultant alkali metal chloride-containing process wastewater. The process according to the invention makes possible, inter alia, improved utilization in electrolysis of the alkali metal chloride-containing solution obtained in the production of diaryl carbonate. | 06-23-2011 |
20110245527 | PROCESS FOR PREPARING DIARYL CARBONATES AND POLYCARBONATES - The present invention relates to a process for the continuous preparation of diaryl carbonates from phosgene and at least one monohydroxy compound (monophenol) in the presence of catalysts, and also the use thereof for preparing polycarbonates. The hydrogen chloride formed in the reaction is converted by thermal oxidation into chlorine, with the chlorine being recirculated to the preparation of phosgene. In particular, the process comprises utilization of the hydrogen chloride formed for the process for preparing diphenyl carbonate (DPC process). | 10-06-2011 |
20110278174 | PROCESS FOR PREPARING DIARYL CARBONATES AND POLYCARBONATES - The present invention relates to a process for the continuous preparation of diaryl carbonates from phosgene and at least one monohydroxy compound (monophenol) in the presence of catalysts, and also the use thereof for preparing polycarbonates. The hydrogen chloride formed in the reaction is converted by electrochemical oxidation into chlorine, with the chlorine being recirculated to the preparation of phosgene. In particular, the process comprises utilization of the hydrogen chloride formed for the process for preparing diphenyl carbonate (DPC process). | 11-17-2011 |
20110308939 | ELECTRODE FOR ELECTROLYTIC PRODUCTION OF CHLORINE - The present invention relates to an electrode that includes an electrically conducting substrate based on a valve metal having a main proportion of titanium, tantalum or niobium, and an electrocatalytically active coating comprising up to 50 mol % of a noble metal oxide or noble metal oxide mixture and at least 50 mol % of titanium oxide. The coating includes a minimum proportion of oxides of anatase structure determined by a ratio of the signal height of the most intensive anatase reflection in an x-ray diffractogram (Cu | 12-22-2011 |
20110311903 | GAS DIFFUSION ELECTRODE AND PROCESS FOR PRODUCTION THEREOF - 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 | 12-22-2011 |
20120021302 | OXYGEN-CONSUMING ELECTRODE - The present invention relates to an oxygen-consuming electrode comprising at least one support structure having a surface and a gas diffusion coating having a catalytically active component disposed on the surface. The coating contains at least one fluorine-containing polymer, a silver compound, selected from the group consisting of silver particles, reducible silver compounds, and mixtures thereof, and a hydrophilic caustic alkali-resistant filler which is electrically nonconductive or has a poor electrical conductivity and has an average particle diameter from 5 to 200 μm. | 01-26-2012 |
20120082906 | PROCESS FOR PRODUCING TRANSPORT- AND STORAGE-STABLE OXYGEN-CONSUMING ELECTRODES - The present invention relates to A process for producing a transport- and storage-stable sheet-like oxygen-consuming electrode comprising providing an electrically conductive support, a gas diffusion layer, and a layer comprising a silver-based catalyst; coating the support with a silver oxide-containing intermediate; and at least partly electrochemically reducing the silver oxide-containing intermediate in an aqueous electrolyte at a pH of less than 8. | 04-05-2012 |
20120100441 | OXYGEN-CONSUMING ELECTRODE - The present invention relates to an oxygen-consuming electrode comprising a support in the form of a sheet-like structure and a coating comprising a gas diffusion layer and a catalytically active component, wherein the support is based on a material which can be at least partly removed by dissolution, decomposition, melting and/or vaporization. Furthermore, the use of this oxygen-consuming electrode in chloralkali electrolysis or fuel cell technology is described. | 04-26-2012 |
20120100442 | OXYGEN-CONSUMING ELECTRODE AND PROCESS FOR PRODUCING IT - An oxygen-consuming electrode includes a support in the form of a sheet-like structure and a coating including a gas diffusion layer and a catalytically active component, wherein the support is based on a material having a conductivity of less than 1000 S/cm, measured at 20° C. The supports are simple to produce and have a low weight and good processability in the production of the oxygen-consuming electrodes. | 04-26-2012 |
20120103828 | ELECTRODE FOR ELECTROLYTIC CHLORINE PRODUCTION - The present invention relates to an electrode comprising an electrically conductive substrate and a catalytically active layer, wherein the catalytically active layer is based on two catalytically active components and comprises iridium, ruthenium or titanium as metal oxide or mixed oxide or mixtures of the oxides, wherein the total content of ruthenium and/or iridium based on the sum of the elements iridium, ruthenium and titanium is at least 10 mol %, and wherein the electrode comprises at least one oxidic base layer which is applied to the electrically conductive substrate and is impermeable to aqueous electrolytes comprising NaCl and/or NaOH and/or HCl. | 05-03-2012 |
20120132539 | METHODS FOR ELECTROCHEMICAL DECHLORINATION OF ANOLYTE BRINE FROM NaCl ELECTROLYSIS - Methods for the reductive post-treatment of NaCl-containing solutions, wherein such methods comprise: providing a NaCl-containing solution obtained from an anode side of an NaCl electrolysis cell, the solution comprising reducible components; and subjecting the solution to cathodic electrochemical reduction. | 05-31-2012 |
20120141888 | OXYGEN-CONSUMING ELECTRODE AND PROCESS FOR THE PRODUCTION THEREOF - The present invention relates to an oxygen-consuming electrode comprising at least one support element in the form of a sheet-like structure and a coating comprising a gas diffusion layer and a catalytically active component, wherein the oxygen-consuming electrode is additionally coated with a fluoropolymer which is soluble in solvents. | 06-07-2012 |
20120145538 | METHOD OF INSTALLING OXYGEN-CONSUMING ELECTRODES IN ELECTROCHEMICAL CELLS AND ELECTROCHEMICAL CELL - A method for the installation of oxygen-consuming electrodes in electrochemical cells includes sealing one or more oxygen-consuming electrodes in an electrochemical half cell having damaged regions and/or overlap regions and applying a sealing paste. The sealing paste includes silver oxide, a hydrophobic polymer component, and a perfluorinated or partially fluorinated solvent. The method may be used, in particular, for chloralkali electrolysis. An electrochemical cell, having one or more adjoining oxygen-consuming electrodes with damaged and/or overlap regions sealed with a sealing paste having silver oxide, a hydrophobic polymer component, and a fluorinated solvent, is also disclosed. | 06-14-2012 |
20120222965 | METHOD OF OPERATING AN OXYGEN-CONSUMING ELECTRODE - 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° C. below the temperature of the cathode space in the cell. | 09-06-2012 |
20120231353 | PROCESS FOR PRODUCING OXYGEN-CONSUMING ELECTRODES - The present invention relates to a process for producing an oxygen-consuming electrode that includes the steps of (a) producing a powder mixture consisting of at least one polymer as binder and a catalytically active component, (b) applying the powder mixture to an electrically conductive sheet-like support element, and (c) compacting and consolidating the powder mixture on the support element using rollers, wherein the rollers used in the compaction step c) comprises a surface coating of tungsten carbide and wherein the roller surface has a roughness of not more than 0.5 μm. | 09-13-2012 |
20120325674 | METHOD FOR IMPROVING THE PERFORMANCE OF NICKEL ELECTRODES - 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. | 12-27-2012 |
20130075249 | OXYGEN-CONSUMING ELECTRODE AND PROCESS FOR PRODUCTION THEREOF - An oxygen-consuming electrode is described, more particularly for use in chloralkali electrolysis, comprising a novel catalyst coating, 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. The oxygen-consuming electrode comprises at least an electrically conductive support, an electrical contact site and a gas diffusion layer comprising a catalytically active component, characterized in that the coating at least one fluorinated polymer, silver in the form of silver particles and silver oxide in the form of silver oxide particles, which is produced in a selected precipitation step. | 03-28-2013 |
20130075251 | OXYGEN-CONSUMING ELECTRODE AND PROCESS FOR THE PRODUCTION THEREOF - 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. | 03-28-2013 |
20130078536 | GAS DIFFUSION ELECTRODES AND PROCESS FOR PRODUCTION THEREOF - 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. | 03-28-2013 |
20130087461 | CATALYST COATING AND PROCESS FOR PRODUCING IT - An improved catalyst coating comprising electrocatalytically active components based on ruthenium oxide and titanium oxide, especially for use in chloralkali electrolysis, is described. A production process for the catalyst coating and a novel electrode is also described. | 04-11-2013 |
20130101499 | METHODS FOR ELECTROCHEMICAL DECHLORINATION OF ANOLYTE BRINE FROM NaCl ELECTROLYSIS - Methods for the reductive post-treatment of NaCl-containing solutions, wherein such methods comprise: providing a NaCl-containing solution obtained from an anode side of an NaCl electrolysis cell, the solution comprising reducible components; and subjecting the solution to cathodic electrochemical reduction. | 04-25-2013 |
20130213799 | ELECTRODE AND ELECTRODE COATING - The invention describes an electrode and an electrode coating which are based on a catalyst containing finely divided carbon modifications and noble metal (oxide)s. | 08-22-2013 |
20130236797 | OXYGEN-CONSUMING ELECTRODE AND METHOD FOR PRODUCING SAME - 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. | 09-12-2013 |
20130240370 | PROCESS FOR ELECTROLYSIS OF ALKALI METAL CHLORIDES WITH OXYGEN-CONSUMING 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. | 09-19-2013 |
20130240371 | PROCESS FOR ELECTROLYSIS OF ALKALI METAL CHLORIDES WITH OXYGEN-CONSUMING ELECTRODES IN MICRO-GAP ARRANGEMENT - Process for electrolysis of alkali metal chlorides with oxygen-consuming electrodes having specific operating conditions for startup and shutdown, which prevents damage to constituents of the electrolysis cell. | 09-19-2013 |
20130240372 | PROCESS FOR ELECTROLYSIS OF ALKALI METAL CHLORIDES WITH OXYGEN-CONSUMING ELECTRODES HAVING ORIFICES - An oxygen-consuming electrode for use in chloralkali electrolysis, having a novel coating, the production thereof, an electrolysis cell comprising the oxygen-consuming electrode and parameters for the startup and shutdown of the electrolysis apparatus, compliance with which prevents damage to the cell. | 09-19-2013 |
20130256151 | ELECTROLYSER WITH COILED INLET HOSE - Electrolyser comprising at least one single electrolyser 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. | 10-03-2013 |
20140014527 | METHOD FOR MOUNTING OXYGEN-CONSUMING ELECTRODES IN ELECTROCHEMICAL CELLS AND ELECTROCHEMICAL CELLS - 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 | 01-16-2014 |
20140093810 | 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 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. | 04-03-2014 |
20140093811 | ELECTROCHEMICAL CELL HAVING A FRAME SEAL FOR ALTERNATIVE SEALING AGAINST MARGINAL LEAKAGES OF THE ELECTROLYTE - 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. | 04-03-2014 |
20150017554 | PROCESS FOR PRODUCING TRANSPORT AND STORAGE-STABLE OXYGEN-CONSUMING ELECTRODE - A process for producing oxygen-consuming electrodes, in particular for use in chloralkali electrolysis, which display good transport capability and storage capability. In the process, a silver oxide-containing sheet-like structure as intermediate is electrochemically reduced. Also disclosed are methods of using these electrodes in chloralkali electrolysis or fuel cell technology or in metal-air batteries, and the fuel cells and metal-air batteries produced. | 01-15-2015 |