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| Number | Title | Issue Date |
| 7175749 | Method and device for detecting anode effects of an electrolytic cell for aluminum production Process for early detection of an anode effect in an aluminum production cell based on molten salt electrolysis. The cell comprises at least one anode, at least one cathode and cathode connecting conductors and anode connecting conductors. The process comprises: | 02/13/2007 |
| 7045484 | Method of making a catalyst A method of making a catalyst. The method comprises the step of leaching alloy particles. Preferably, the alloy particles are hydrogen storage alloy particles. ... | 05/16/2006 |
| 7001497 | Process and apparatus for positioning replacement anodes in electrolytic cells A spent anode is replaced with a new anode in an electrolysis cell having an anode bus bar and an anode rod contacting the bus bar. A desired distance (D4) from the bus bar to a reference point on or adjacent to an anode rod for the new anode is calculated, t... | 02/21/2006 |
| 6936229 | Recovery of lithium compounds from brines Methods and apparatus for the production of low sodium lithium carbonate and lithium chloride from a brine concentrated to about 6.0 wt % lithium are disclosed. Methods and apparatus for direct recovery of technical grade lithium chloride from the concentrated brine... | 08/30/2005 |
| 6296745 | Method of operating chlor-alkali electrolytic cells A method of operating a chlor-alkali electrolytic cell comprising a catholyte compartment containing a cathode, an anolyte compartment containing an anode, and a liquid-permeable diaphragm partitioning the catholyte and anolyte compartments, is described.... | 10/02/2001 |
| 6217733 | Bipolar membrane and method for fabricating such bipolar membrane A bipolar membrane, usable for electrodialysis of aqueous electrolytes, comprises two ion exchange membranes, respectively anionic and cationic, juxtaposed along a common surface, wherein, along said common surface, a gel based on hydrated metal sulpate a... | 04/17/2001 |
| 6193872 | Process and plant for treating an aqueous waste stream containing at least one alkali metal carboxylate The invention proposes a process and waste treatment plant for regenerating alkali metal hydroxide (3) from an alkaline aqueous waste stream (5) that contains alkali metal C3+ carboxylate byproduct. The waste stream (5) is acidified and the resulting liqu... | 02/27/2001 |
| 6123826 | Method for removal of nickel and iron from alkali metal hydroxide streams without requiring the use of sodium borohydride The present invention relates to a method to control of the presence of nickel and/or iron in a caustic solution using at least two magnets to remove about one third of the nickel and/or iron present in a caustic solution. The method involves passing cell... | 09/26/2000 |
| 5919348 | Modification of the flow resistance of diaphragms The flow resistance of a diaphragm based on a fiber material is modified by treating the diaphragm during or after preparation thereof with a dispersion comprising a fluorine-containing component and optionally with a solution comprising a precursor of Zr... | 07/06/1999 |
| 5888368 | Process for manufacturing an aqueous sodium hydroxide solution Process for manufacturing sodium hydroxide by the electrodialysis of sodium carbonate in an electrodialysis cell having three compartments, in which an aqueous sodium carbonate solution is introduced into a compartment of the cell which is bounded between... | 03/30/1999 |
| 5716504 | Cation exchange membrane for electrolysis and process for producing potassium hydroxide of high purity A cation exchange membrane for electrolysis, which comprises at least 2 layers of fluorine-containing polymer films having sulfonic acid groups, wherein a first layer facing a cathode is made of a three component polymer of the following monomers (A), (B)... | 02/10/1998 |
| 5512143 | Electrolysis method using polymer additive for membrane cell operation where the polymer additive is ionomeric and added to the catholyte The operation of electrolytic cells employing ion exchange membranes is improved by addition to the catholyte of a fluorinated ionomer resin resulting in a long-term reduction in the operating voltage of the electrolytic cell.... | 04/30/1996 |
| 5482696 | Method for the purification and/or electrolysis of an aqueous potassium chloride solution The present invention concerns a method for the purification and/or electrolysis of an aqueous potassium chloride solution, in which the sulphate ions are removed from the aqueous potassium chloride solution by precipitation as potassium sulphate and/or a... | 01/09/1996 |
| 5290410 | Electrode and its use in chlor-alkali electrolysis The invention relates to an electrode for electrolysis, whose front side comprises a plurality of substantially parallel channels defined by substantially parallel threads of electrically conducting material, which are attached to and in electric contact ... | 03/01/1994 |
| 5192401 | Diaphragm for use in chlor-alkali cells A liquid permeable diaphragm for use in an electrolytic chlor-alkali cell, the diaphragm being made of fibrous material and having particulate zirconia deposited in the interstices of the fibrous matrix, prior to installing the diaphragm in the cell. Also... | 03/09/1993 |
| 5188712 | Diaphragm for use in chlor-alkali cells A liquid permeable diaphragm for use in an electrolytic chlor-akali cell, the diaphragm being made of fibrous material and having deposited thereon and cementitiously bonded to the anode face thereof at least one topcoating of inorganic, particulate, refr... | 02/23/1993 |
| 5084149 | Electrolytic process for producing chlorine dioxide An electrochemical process and electrolytic cell for manufacturing chlorine-free chlorine dioxide from a dilute alkali metal chlorite solution in a single step is disclosed. The electrolytic cell uses a porous flow-through anode and a cathode separated by... | 01/28/1992 |
| 4919791 | Controlled operation of high current density oxygen consuming cathode cells to prevent hydrogen formation A process for the electrolysis of an alkali metal halide brine is operated in an electrolytic cell having an anode compartment containing at least one anode, a cathode compartment containing at least one cathode, and a cation exchange membrane separating ... | 04/24/1990 |
| 4909912 | Ion exchange membrane cell and electrolytic process using thereof An ion exchange membrane cell comprises an anode, a cathode, an anode compartment and a cathode compartment formed by partitioning by an ion exchange membrane. A gas and liquid permeable porous non-electrode layer is bonded at least one of surface of said... | 03/20/1990 |
| 4834847 | Electrochemical cell for the electrolysis of an alkali metal halide and the production of a halogenated hydrocarbon An electrochemical cell and process for the electrolysis of an aqueous solution of an alkali metal halide and the production of a halogenated hydrocarbon comprising an electrolytic cell having a gas depolarized anode and a cathode which can be a dimension... | 05/30/1989 |
| 4832805 | Multi-layer structure for electrode membrane-assembly and electrolysis process using same A unitary membrane-electrode assembly includes a structure with multiple layers having different overvoltages for the desired electrochemical reaction. The layer attached to the membrane has a higher overvoltage for the electrochemical reaction than the e... | 05/23/1989 |
| 4824534 | Process for electrically separating the electrolyte-bearing mains from the electrolyte spaces of an electrochemical cell pile In this process for electrically separating the electrolyte-bearing main from the electrolyte spaces of an electrochemical cell pile, the electrolyte is passed via drop sections directly from the main into the electrolyte space or directly from the electr... | 04/25/1989 |
| 4749452 | Multi-layer electrode membrane-assembly and electrolysis process using same A unitary membrane-electrode assembly includes an electrode structure with multiple layers having different overvoltages for the desired electrochemical reaction. In the preferred arrangement the layer attached to the membrane has the higher overvoltage t... | 06/07/1988 |
| 4747917 | Scale-free process for purifying concentrated alkali metal halide brines containing sulfate ions as an impurity A process for reducing sulfate ion concentrations in an alkali metal halide brine to be electrolyzed in an electrolytic cell comprises feeding the alkali metal halide brines to a reaction zone containing a slurry of gypsum crystals having a concentration ... | 05/31/1988 |
| 4670114 | Fine, uniform particles, and precipitation or depositing of particles from a solution The precipitation or deposition of particles from a solution in a cell (61) which an electric field is applied between an anode (65,67,68) and a cathode (66), typically an electrolysis cell for the co-precipitation of mixed oxides but also cells for elect... | 06/02/1987 |
| 4666573 | Synthetic diaphragm and process of use thereof A non-asbestos, electrolyte permeable diaphragm fabricated of thermoplastic organic polymer material containing ion exchange functional groups or precursor groups thereof is disclosed. The diaphragm can be prepared by providing a slurry of the organic pol... | 05/19/1987 |
| 4647351 | Process for generating chlorine and caustic soda using a membrane electrolysis cell coupled to a membrane alkaline fuel cell A process for making chlorine gas and concentrating caustic soda comprising: (1) feeding a brine to the anolyte compartment solution and a dilute NaOH solution to the catholyte compartment of an electrolysis cell comprising a cation-transporting membrane,... | 03/03/1987 |
| 4595469 | Electrolytic process for production of gaseous hydrogen chloride and aqueous alkali metal hydroxide Disclosed is a process for the production of gaseous hydrogen chloride and aqueous alkali metal hydroxide from brine, utilizing an electrolytic cell containing a hydroxyl ion producing cathode and a gaseous hydrogen chloride producing hydrogen-consuming g... | 06/17/1986 |
| 4586992 | Process for producing potassium hydroxide A process for producing potassium hydroxide by electrolysis of potassium chloride in an electrolytic cell comprising an anode compartment and a cathode compartment partitioned by a cation exchange membrane, which process comprises supplying potassium chlo... | 05/06/1986 |
| 4586993 | Control of sulfates in membrane cell chlor-alkali process Method of addition of calcium ions to salt-depleted brine prior to resaturation, wherein the concentration of sulfate impurity is controlled. The invention relates to a process for the electrolysis of aqueous alkali metal chloride solutions to produce chl... | 05/06/1986 |
| 4540474 | Light level electrode setting gauge and method of use A method of adjusting the position of objects in relation to a datum plane, the method including the step of providing a mark on the objects at a known distance from the surface of the objects that will be positioned in predetermined relationship with the... | 09/10/1985 |
| 4512857 | Prevention of corrosion of electrolyte cell components Disclosed is a method of operating an electrolytic cell having an active, catalytic cathode and an iron structure in contact with an alkaline electrolyte. The dissolution of iron into the electrolyte is reduced by a sacrificial anode in proximity to, and ... | 04/23/1985 |
| 4502928 | Method and apparatus for producing halogen A halogen production apparatus comprising a halogen production device and a metal-halogen secondary cell which contains in its electrolyte the same halogen as is produced by the production device. Drive power is supplied to the production device from a co... | 03/05/1985 |
| 4488946 | Unitary central cell element for filter press electrolysis cell structure and use thereof in the electrolysis of sodium chloride Unitary, cast structural element for filter press electrolysis cell which incorporates into a single unit the central barrier between the peripheral boundaries for the adjacent anolyte compartment and adjacent catholyte compartment of two electrolysis cel... | 12/18/1984 |
| 4466869 | Photolytic production of hydrogen Disclosed is a photolytic device comprising a photoelectrode having a plurality of stacked, individual photoelectric or photovoltaic elements between a substrate and an electrode, a counterelectrode which may be a separate spaced counterelectrode or the s... | 08/21/1984 |
| 4437950 | Method of controlling aluminum electrolytic cells Increase or decrease in a quantity of alumina presenting in a bath or a metal in an aluminum electrolytic cell is detected and a quantity of electric power supplied to the cell is increased or decreased in accordance with the result of detection. The dete... | 03/20/1984 |
| 4434041 | Method for conditioning carboxylate/sulfonate composite membranes for producing KOH A procedure for conditioning new composite laminated membranes in chlor-alkali cells producing KOH, said membrane being comprised of a laminated composite made from individual perfluorosulfonyl and perfluorocarboxylic acid layers, so that said membrane wi... | 02/28/1984 |
| 4396473 | Cathode prepared by electro arc spray metallization, electro arc spray metallization method of preparing a cathode, and electrolysis with a cathode prepared by electro arc spray metallization Discloses a cathode having a porous surface prepared by electro arc spray metallization of two wires of a leachable metal and a catalytic metal onto a substrate, and removal of the leachable metal. Also discloses method of preparing the cathode, and an el... | 08/02/1983 |
| 4394229 | Cathode element for solid polymer electrolyte Disclosed is a solid polymer electrolyte unit, an electrolytic cell containing the unit, and an electrolytic process utilizing the unit. The solid polymer electrolyte unit has anodic and cathodic means contacting opposite surfaces thereof, and is characte... | 07/19/1983 |
| 4381230 | Operation and regeneration of permselective ion-exchange membranes in brine electrolysis cells Methods of membrane regeneration of permselective ion-exchange membranes of a brine electrolysis cell are greatly improved when the cells are fed brine which contains little or no carbon dioxide, carbonate anions or bicarbonate anions during normal electr... | 04/26/1983 |