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5205911 |
Cathode restoration
Chlor-alkali electrolytic cells can have separators used with metal cathodes. These cells may often be subject to frequent current interruptions. Particularly where the cathode and separator...
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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...
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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...
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4940518 |
Combination seal member and membrane holder for a filter press type electrolytic cell
A combination electrolysis cell gasket member and membrane holding member suitable for use in an electrolytic cells of the filter press type including a solid structure in a picture frame type...
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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...
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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...
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4729819 |
Method for restoring the current efficiency
In the electrolysis of sodium chloride by means of a perfluoro cation exchange membrane for the production of sodium hydroxide having a concentration of from 32 to 40% by weight, a method for...
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4687558 |
High current density cell
A filter press membrane electrolytic cell having at least one cathode and one anode sandwiched about a permselective ion exchange membrane which employs a cathode having a first layer and a second...
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4661218 |
Ion exchange membrane cell and electrolysis with use thereof
An ion exchange membrane cell which comprises an anode, a cathode, and an anode compartment and a cathode compartment partitioned by an ion exchange membrane. The ion exchange membrane is a cation...
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4655887 |
Process for electrolyzing aqueous solution of alkali metal chloride
An aqueous solution of an alkali metal chloride is electrolyzed by feeding said aqueous solution of an alkali metal chloride into an anode compartment and feeding an oxygen-containing gas in a...
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4652356 |
Ion exchange membrane and electrolytic cell using thereof
A cation exchange membrane comprising a gas and liquid permeable porous non-electrode layer on at least one surface of said membrane and an electrolytic cell using thereof, wherein said porous...
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4648949 |
Process for electrolysis of silica-containing brine
In an improved process for the electrolysis of silica-containing brine in a membrane cell, the thickness of the membrane, the concentration of silica, aluminum and calcium in the brine and the...
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4561946 |
Electrolytic cell for the electrolysis of an alkali metal chloride and process of using said cell
An electrolytic cell for the electrolysis of an alkali metal chloride, wherein an ion-exchange membrane provided at least on one side thereof with a gas and liquid permeable non-electrocatalytic...
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4537673 |
Electrolytic cell
An electrolytic cell comprises intercalated finger-shaped electrodes each disposed through a cation exchange membrane, in which said cation exchange membrane constitutes a cylinder or envelope...
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4486276 |
Method for suppressing hydrogen formation in an electrolytic cell
A method of operating an electrolytic cell in which cathodic hydrogen formation is suppressed by contacting the catalytic cathode with air or other oxygen-containing gas. The cells are of two...
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4477321 |
Sacrificial reinforcements in cation exchange membrane
A fluorocarbon cation exchange membrane containing a sacrificial reinforcement for tear resistance which, in use as a cation exchange membrane for alkali metal chloride electrolysis, degrades to...
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4465568 |
Electrochemical production of KNO.sub.3 /NaNO.sub.3 salt mixture
A process for the electrolytic production of a chloride-free mixture consisting essentially of sodium and potassium nitrates is disclosed. In this process, an anolyte brine comprised of a mixture...
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4445986 |
Electrochemical cell having a separator-gas electrode combination
The invention is an electrochemical cell containing a separator-gas electrode combination comprising a separator having a first and a second face adapted to permit the flow of fluids or ions...
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4411749 |
Process for electrolyzing aqueous solution of alkali metal chloride
A process for electrolyzing an aqueous solution of an alkali metal chloride by feeding said aqueous solution of an alkali metal chloride into the central space of a hollow quadrilateral frame...
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4410404 |
Membrane cell at increased caustic concentration
An improved process for producing high purity caustic in a chlor/alkali cell utilizing a sulfonamide membrane allowing for improved current efficiency with approximately constant voltage by...
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4367126 |
Process for producing alkali metal hydroxide
An alkali metal hydroxide is produced by electrolyzing an aqueous solution of an alkali metal chloride fed into an anode compartment in a cell having an anode compartment and a cathode compartment...
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4341605 |
Process for cation permeable membrane with reinforcement fabric embedded therein and product thereof
A cation permeable membrane containing areas of thin wall construction comprises a cation exchange polymer matrix having a reinforcement fabric embedded therein. A two-step lamination procedure is...
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RE30864 |
Process for electrolysis in a membrane cell employing pressure actuated uniform spacing
An electrolytic cell employing a hydraulically impermeable membrane having a spacing means interposed between the anode and the membrane, is operated by providing a positive pressure differential...
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4313805 |
Chlorine cell catholyte series flow
Improvements in electrolytic chlor-alkali membrane cells, operated with cell-to-cell catholyte series flow, are obtained by the use, as membranes, of fluoropolymers containing pendant functional...
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4293394 |
Electrolytically producing chlorine using a solid polymer electrolyte-cathode unit
Disclosed is a solid polymer electrolyte electrolytic cell where the cathodic reaction takes place at a three phase catholyte-cathode catalyst-permionic membrane interface. The structure to carry...
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4288310 |
Membrane support assembly for electrolytic cell and method of making same
Method of supporting a preformed membrane in an electrolytic cell, and apparatus therefor, which comprises casting in situ support plates about the open edges of the membrane.
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4276130 |
Process for the production of high purity aqueous alkali hydroxide solution
High purity aqueous alkali hydroxide solutions containing predetermined, low concentrations of alkali metal halide are obtained in the anode compartment of an electrolytic cell using a cationic ion...
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4268365 |
Method of electrolysis of an alkali metal chloride
Electrolysis of an alkali metal chloride solution using an ion exchange membrane is carried out by bringing the anode and the cathode into contact with the surfaces of the ion exchange membrane,...
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4169024 |
Process for electrolytically producing chlorine in a cell having a diaphragm comprising hydrophilic fluoropolymers
Certain fluoropolymers, when chemically modified by reacting them with sulfur or phosphorus containing compounds, become hydrophilic materials useful for making ion-exchange membranes, especially...
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4153520 |
Method for the electrolytic production of chlorine from brine
Certain fluoropolymers, when chemically modified by reacting them with sulfur or phosphorus containing compounds, become hydrophilic materials useful for making ion-exchange membranes, especially...
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4135996 |
Selective diaphragm for electrolysis
A selective composite diaphragm is provided comprising a ion-exchange membrane having at least one microporous layer joined to it, whereby the microporous layer is of high, homogeneous porosity and...
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4124458 |
Mass-transfer membrane and processes using same
A porous layer is provided on one or both surfaces of a mass-transfer membrane to enhance or modify the passage of ions. The membrane may be a film of any of a variety of polymeric materials, and...
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4076603 |
Caustic and chlorine production process
Alkali metal hydroxide and chlorine are produced in a membrane-equipped electrolysis cell system in a staged manner wherein at least one cell of the system is used to generate a dilute caustic...
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3905879 |
Electrolytic manufacture of dithionites
Dithionites are made by a process which begins with the production of high concentration, chloride-free sodium hydroxide solution and chlorine at a high current efficiency from a three-compartment...
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3904496 |
Electrolytic production of chlorine dioxide, chlorine, alkali metal hydroxide and hydrogen
Chlorine dioxide, chlorine, alkali metal hydroxide and hydrogen are produced from hydrogen chloride, alkali metal chlorate, alkali metal chloride and water in a three compartment electrolytic cell...
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3899403 |
Electrolytic method of making concentrated hydroxide solutions by sequential use of 3-compartment and 2-compartment electrolytic cells having separating compartment walls of particular cation-active permselective membranes
A concentrated hydroxide solution containing over 250 g./l. of sodium hydroxide is made by a two-cell aqueous sodium chloride electrolysis process wherein, in a first cell, containing at least...
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3897320 |
Electrolytic manufacture of chlorates, using a plurality of electrolytic cells
A sodium chloride solution is electrolyzed to produce a high strength caustic solution and sodium chlorate solution, using two different electrolytic cells. In the first cell, a two-compartment...
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2967807 |
Electrolytic decomposition of sodium chloride
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