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| Number | Title | Issue Date |
| 8062532 | Process for electrolytic production of chlorine products and byproducts An integrated process separates salts from salty waters and electrolyzes the salts to produce chlorine products such as chlorine, hypochlorites, chlorates and/or caustic soda. ... | 11/22/2011 |
| 7972493 | Filter wash for chloralkali process Filter wash methods and apparatuses for chloralkali processes are provided. The filter wash uses in-process fluids from the chloralkali process to wash filters. The in-process fluids may be drawn from a point in the chloralkali process where the in-process fluids co... | 07/05/2011 |
| 7252767 | Hydrous zirconium oxide, hydrous hafnium oxide and method of making same The present invention features a method of making hydrous zirconium oxide having desirable properties, including resistance to moisture content, predetermined particle size, and developed porosity and surface area. The inventive material is suitable for use as an io... | 08/07/2007 |
| 7186394 | Retarding agents for preparing purified brine The invention relates to a process to produce brine of improved purity wherein a salt source, contaminated with sulphate ions and alkaline (earth) metal ions, is dissolved in water in the presence of an effective amount of a retarding agent comprising at least one l... | 03/06/2007 |
| 7128824 | Method for electrolysis of aqueous solutions of hydrogen chloride A method for the electrolysis of aqueous solutions of hydrogen chloride in order to produce chlorine, characterized in that the following process parameters are maintained for initial operation: the anode half-element is filled wit... | 10/31/2006 |
| 7077968 | Method for continuously filtering raw brine for use in chlor-alkali electrolysis The method of continuously processing raw brine with a solids content to obtain substantially solids-free pure brine (E) for use in chlor-alkali electrolysis. In this method the raw brine (A) is separated, by means of a decanter (1), into a clear brine (B) wi... | 07/18/2006 |
| 6957743 | Microbiological water filter A method and device for the filtration and/or purification of fluids water or other solutions containing microbiological contaminants, such as fluids containing including bacteria and/or viruses, where the fluid water is passed through a purification material compos... | 10/25/2005 |
| 6949226 | Sodium-based dechlorinating agent and waste treatment equipment A sodium-based dechlorinating agent is added to a flue gas; hydrogen chloride contained in this flue gas is removed as residue of dechlorination; the thus removed residue of dechlorination is dissolved by adding water; water-insoluble constituents are separated from... | 09/27/2005 |
| 6919364 | Microbiological control in animal processing Fecal bacterial contamination in an animal is reduced by providing it with drinking water containing a microbiocidally-effective amount of halogen-based microbiocide resulting from mixing with water (A) a product formed in water from (i) bromine, chlorine, or bromin... | 07/19/2005 |
| 6913742 | Process for the purification of inorganic salt containing organic material and purified salt for electrolysis of sodium chloride An object of the present invention is to provide an effective and efficient process for the treatment of an inorganic salt containing an organic material which can solve various problems with the prior art, i.e., process for purifying an inorganic salt containing an... | 07/05/2005 |
| 6884337 | Production of basic hydrogen peroxide for chemical oxygen-iodine laser devices A method of generating basic hydrogen peroxide (BHP) fuel for a chemical oxygen-iodine laser (COIL) using stored alkali chloride, typically potassium chloride, and water. The alkali chloride and water are mixed to form a saturated or nearly saturated aqueous salt so... | 04/26/2005 |
| 6746592 | Process for removing aluminum species from alkali metal halide brine solutions A method for the reduction of soluble aluminum species in an evaporated salt alkali metal halide brine containing up to 500 ppb aluminum species to provide a brine feedstock suitable for use in a chlor-alkali membrane cell process, said method comprising treating sa... | 06/08/2004 |
| 6547948 | Method of increasing the concentration of dilute brine in NaCl electrolysis plants using the membrane process The present invention relates to a method of increasing the concentration of dilute brine in NaCl electrolysis plants using the membrane process, wherein the NaCl required is stored in a mass flow silo with supernatant liquid and is fed continuously from ... | 04/15/2003 |
| 6428677 | Bromide removal A chlorination system in which brine is converted to sodium hypochlorite by an electrolyser. Brine (1) fed to the electrolyser (3) is passed through a filter (2) which is capable of adsorbing bromine or hypobromous acid. Some of the sodium hypochlorite pr... | 08/06/2002 |
| 6309530 | Concentration of chlor-alkali membrane cell depleted brine This invention relates to methods, systems and installations for concentrating depleted brine produced by the electrolytic decomposition of concentrated brine in chlor-alkali membrane cells and to the efficient use of power, steam and brine. More particul... | 10/30/2001 |
| 6238544 | Method of purification of salt solutions for electrolysis In a method of removing impurities, especially iodine and/or silica ions, from a salt solution to be used for electrolysis, the salt solution and zirconium hydroxide are brought into contact with each other under acidic conditions, and the zirconium hydro... | 05/29/2001 |
| 6224740 | Electrolysis process The invention relates to a process for the electrolysis of sodium chloride-containing brine with parallel operation of amalgam electrolysis units (5) and membrane electrolysis units (4) with a common brine circuit using a mercury-resistant oxygen consumab... | 05/01/2001 |
| 6203692 | Electrochemical purification of chlorine A process for separating chlorine gas from a mixture with other gases is disclosed. In the process, chlorine gas, either as an impure gas or as dissolved gas in hydrochloric acid, is reduced at the cathode of an electrochemical cell to form chloride ions,... | 03/20/2001 |
| 6200455 | Method for reducing the plating of nickel on vessels, piping and cells in an alkali metal hydroxide manufacturing process A method to prevent cladding or plating of metals, such as nickel or iron in a continuous production of alkali metal hydroxides which involves several steps: electrolyzing an aqueous alkali metal salt solution forming hydrogen, chlorine and an at least 10... | 03/13/2001 |
| 6132591 | Method for removal of sulfate groups and chlorate groups from brine In removal of sulfate groups and chlorate groups from brine used for electrolysis, concentrated brine used in an electrolysis process or dilute brine whose concentration is decreased by electrolysis is fed to an anode chamber divided by a cation exchange ... | 10/17/2000 |
| 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 |
| 6103092 | Method for reducing metal ion concentration in brine solution The method reduces the concentration of multivalent metal cations such as calcium, magnesium, iron, nickel, and chromium in brine solution containing a water-soluble metal chelating agent such as sodium gluconate. The method comprises subjecting the brine... | 08/15/2000 |
| 6080299 | Method for removal of nickel and iron from alkali metal hydroxide manufacturing process requiring the use of sodium borohydride The method involves the steps of: exposing a cell liquor containing metal to a first magnet, magnetically removing up to about one third of said metal present in the cell liquor, evaporating a significant amount of water out of that fluid, and raising the... | 06/27/2000 |
| 5681447 | Removal of trace metal and metalloid species from brine Process for the removal of heavy metal, metalloid and fluoride species present in trace mounts from aqueous brine of use in the production of chlorine and sodium hydroxide by electrolysis in membrane cells or in chlorate production; particularly to said r... | 10/28/1997 |
| 5628874 | Reduction of chloride in pulping chemical recovery systems The present invention relates to an environmental-friendly process for reducing the content of chloride in a liquor inventory of a chemical pulp mill. According to the invention, in a recovery system for pulping chemicals containing sulphur and an alkali ... | 05/13/1997 |
| 5534131 | Process for heavy metals electrowinning The conditions for electrowinning Zn, Ni, Co and Cd metals from baths based on chlorinated ammino complexes of Me(NH3)n Clm type are substantially improved by the addition of small levels of dissolved Br, which considerabl... | 07/09/1996 |
| 5466347 | Method for electrolyzing aqueous solution of alkali chloride The present invention is intended to prevent the formation of impurities such as chlorate in electrolysis using the ion exchange membrane method, without resorting to the addition of hydrochloric acid to counter the migration of alkali hydroxide from the ... | 11/14/1995 |
| 5324497 | Integrated procedure for high yield production of chlorine dioxide and apparatus used therefor A novel continuous process and system are provided for the production of chlorine dioxide at favorable economics and high efficiency. The process involves effecting electrolysis of an aqueous solution of alkali metal chloride, in an electrolysis zone, to ... | 06/28/1994 |
| 5308455 | Process for the manufacture of sodium hydroxide Process for the manufacture of sodium hydroxide, according to which an electrodialysis cell is used, water or an aqueous sodium hydroxide solution (10, 10') is introduced into a chamber (6, 6') of the cell, defined between a cationic membrane (2, 2') and ... | 05/03/1994 |
| 5126019 | Purification of chlor-alkali membrane cell brine This invention relates to methods and systems for purifying brine for electrolysis in chlor-alkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesireable ions s... | 06/30/1992 |
| 5028302 | Purification of chlor-alkali membrane cell brine This invention relates to methods and systems for purifying brine for electrolysis in chlor-alkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesireable ions s... | 07/02/1991 |
| 4996098 | Coated cation exchange fabric and process A coated cation exchanged fabric having as its base a fluorinated cation exchange resin, oriented at least 1x, in alkali metal salt form and as its coating an unoriented or oriented melt-fabricable precursor of the same salt-form fluorinated cation exchan... | 02/26/1991 |
| 4963235 | Process for treating electrolytic cell products An electrolytic cell of the type to which electrolyte is continuously charged and from which a product or products of electrolysis is or are continuously removed, the electrolytic cell being associated in close proximity with an item or items of apparatus... | 10/16/1990 |
| 4839003 | Process for producing alkali hydroxide, chlorine and hydrogen by the electrolysis of an aqueous alkali chloride solution in a membrane cell Alkali hydroxide, chlorine and hydrogen are produced from an aqueous alkali chloride solution by membrane electrolysis. A high-NaCl solid salt, which contains impurities, is dissolved in water in a salt dissolver. Precipitating chemicals are added to the ... | 06/13/1989 |
| 4830837 | Process for removing aluminum from concentrated alkali metal halide brines A process for purifying an alkali metal halide brine containing aluminum as an impurity which comprises adjusting the pH of the alkali metal halide brine to the range of from about 8.5 to about 9.5 and contacting the alkali metal halide brine with an ion ... | 05/16/1989 |
| 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 |
| 4747957 | Brine treatment using ethylene carboxylic acid polymers Hardness values (Ca++ and Mg++) and other polyvalent metal cations are removed from alkali metal brines (esp. NaCl) by using a high surface area ethylene/carboxylic acid polymer (esp. porous ethylene/acrylic acid copolymers).... | 05/31/1988 |
| 4683040 | Process for electrolysis of sodium chloride A process for the electrolysis of aqueous solutions of sodium chloride in an electrolytic cell separated into an anode chamber and a cathode chamber by a perfluorocarbon copolymer cation exchange membrane having pendant carboxylic acid groups. The process... | 07/28/1987 |
| 4643808 | Method for controlling chlorates A method for controlling chlorates in an aqueous alkali metal hydroxide liquor produced by an ion exchange membrane electrolysis is provided, which comprises adding a reducing agent to brine to keep the concentration of chlorates to a specified value or l... | 02/17/1987 |
| 4618403 | Method of stabilizing metal-silica complexes in alkali metal halide brines A process for electrolysis in a membrane electrolytic cell comprises feeding a concentrated alkali metal halide brine containing complex-forming elements and silica at a pH of from about 4 to about 12 to the cell. The alkali metal halide brine is electrol... | 10/21/1986 |
