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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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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....
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...
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,...
4379035 Method of operating an electrolytic cell  
Discloses a method of operating a chlor-alkali cell having a low hydrogen overvoltage cathode and exposed high hydrogen overvoltage metal structure within the cathode compartment, where a...
4356068 Permionic membrane  
Disclosed is an electrolytic cell having an anode and cathode separated by and in contact with a permionic membrane. The cathodic surface of the permionic membrane is characterized by microporous...
4339314 Solid polymer electrolyte and method of electrolyzing brine  
Disclosed is a solid polymer electrolyte electrolytic cell having a fluorinated carboxylic acid permionic membrane with anodic catalyst embedded in a hydrophobic film on the permionic membrane. The...
4339313 Method of operating an electrolytic cell  
Disclosed is a method of preparing a cathode-diaphragm assembly for an electrolytic cell, where the diaphragm is adherent, e.g., to itself and to the cathode. The cathode-diaphragm unit is prepared...
4333804 Method of preventing deterioration of palladium oxide anode  
The deterioration of a palladium oxide type anode caused by stopping the operation of a diaphragm type electrolytic cell in the electrolysis of an alkali metal chloride is prevented by increasing...
4329209 Process using an oxidant depolarized solid polymer electrolyte chlor-alkali cell  
Disclosed is the ultrasonic treatment of a solid polymer electrolyte to dislodge reaction products. Also disclosed is the use of an amide anodic surface to provide a hydrophobic surface. Disclosed...
4323436 Purification of aqueous solution of potassium chloride  
A purification of an aqueous solution of potassium chloride which is used for producing potassium hydroxide by an electrolysisin an electrolytic cell using a cation exchange membrane is carried out...
4323435 Method of operating a solid polymer electrolyte chlor-alkali cell  
Disclosed is a method of operating a solid polymer electrolyte chlor-alkali cell by imposing a pulsative current, e.g., pulsed direct current, half wave alternating current, or rectified...
4311567 Treatment of permionic membrane  
Disclosed is a method of electrolyzing alkali metal chloride brine in permionic membrane cell where the permionic membrane is hydrolyzed in situ. The membrane is hydrolyzed by electrodialytically...
4311566 Electrolyte permeable diaphragm  
Disclosed is an electrolyte permeable, non-asbestos diaphragm for chlor-alkali electrolytic cells. The diaphragm is a cohesive matrix of a non-asbestos structural component and a binder, and is...
4297182 Production of alkali metal hydroxide  
A gas and liquid permeable cathode is bonded on an ion-exchange membrane and the composite electrode is used in an electrolytic cell for a production of sodium hydroxide by an electrolysis of an...
4285786 Apparatus and method of monitoring temperature in a multi-cell electrolyzer  
An apparatus and method of monitoring temperature in a multicell electrolyzer used to produce a gaseous product from a liquid phase electrolyte by placing a single temperature sensing means in the...
4282074 Electrolytic process utilizing a transition metal-graphite intercalation compound cathode  
Disclosed is a method of electrolyzing an alkali metal chloride brine where the cathode is an intercalation compound of graphite and a transition metal. Also disclosed is a solid polymer...
4274928 Process for electrolyzing brine in a permionic membrane electrolytic cell  
Disclosed is an electrolytic cell having an anode unit, a cathode unit substantially parallel to and spaced from the anode unit with individual cathodic elements therein, and a permionic membrane...
4272338 Process for the treatment of anolyte brine  
A process for removing dissolved halogen gas and oxyhalide ions from an aqueous alkali metal halide solution containing them which comprises reacting said aqueous alkali metal halide solution with...
Matches 1 - 50 out of 85 1 2 >