Class 204/525 - With prevention of scale buildup or fouling of membrane

Subclass of Class 204 - Chemistry: electrical and wave energy
Definition: Process in which action is taken to prevent accumulation
No. of patents: 36
Last issue date: 12/15/2009

Number	Title	Issue Date
7632387	Electrodialysis operation with buffer solution A new method for improving the efficiency of electrodialysis (ED) cells and stacks, in particular those used in chemical synthesis. The process entails adding a buffer solution to the stack for subsequent depletion in the stack during electrolysis. The buffer soluti...	12/15/2009
7247222	Electrochemical processing cell Embodiments of the invention may generally provide a small volume electrochemical plating cell. The plating cell generally includes a fluid basin configured to contain a plating solution therein, the fluid basin having a substantially horizontal weir. The cell furth...	07/24/2007
7217349	Method of separating multivalent ions and lactate ions from a fermentation broth The invention pertains to a method of separating multivalent ions and lactate ions from a fermentation broth comprising a multivalent ion lactate salt by using an electrodialysis or electrolysis apparatus, comprising the steps of introducing the broth wherein the mu...	05/15/2007
7198722	Process for pre-treating and desalinating sea water Water containing dissolved salts, such as calcium sulfate, calcium chloride, magnesium sulfate, magnesium chloride, sodium carbonate, sodium chloride, sodium sulfate, calcium bicarbonate, and mixtures thereof, is treated to reduce the concentration of those salts. A...	04/03/2007
7018815	Method for producing vitamin B12 from hydrogen-metabolizing methane bacterium Mesophilic methane bacteria obtained from digested sludge are acclimatized in an H2/CO2 medium and the acclimatized methane bacteria are grown on a support inclusive of inorganic nutritional salts of trace metal elements by using an immobilized...	03/28/2006
6929748	Apparatus and method for continuous electrodeionization A method of water purification including the steps of passing source water through at least one reverse osmosis unit to produce a product water and reject water, directing the product water from a reverse osmosis unit into the dilution stream of a continuous electro...	08/16/2005
6824662	Electrodeionization apparatus and method An electrodeionization apparatus and method for purifying a fluid. A fluid, such as water, can be purified by removing weakly ionizable species from the fluid. Weakly ionizable species may be dissociated at different pH levels to facilitate removal from the fluid in...	11/30/2004
6565725	Method for producing deionized water A method for producing deionized water by an electro-regenerating deionization method, which comprises employing a deionized water producing apparatus comprising an electrodialyzer, and ion exchangers being accommodated in the demineralizing compartments,...	05/20/2003
6495013	Bipolar membrane electrodialysis of multivalent metal salts whose corresponding base is insoluble Bipolar membrane electrodialysis methods for salt splitting polyvalent metal salts, where the metal cation can form substantially insoluble precipitates in the presence of hydroxyl ions can now be used in recovering acid and base values from a salt stream...	12/17/2002
6461491	Method and apparatus for electrodialysis processing An electrodialysis apparatus includes a stack of alternating cation and anion semi-permeable, ion-selective membranes disposed between a positive DC potential anode electrode and a negative DC potential cathode electrode. The cation and anion selective me...	10/08/2002
6331236	Electrodialysis of salts for producing acids and bases An electrodialysis cell is operated in the presence of organic compounds that bind or chelate with the multivalent metals to form metal-chelate buffers. Among other things, this binding or chelating reduces power consumption, produces a stable cell operat...	12/18/2001
6296751	Electrodeionization apparatus with scaling control First and second stages are used in electrodeionization to purify water including calcium and carbon dioxide and its hydrates. The diluting flow channels of the first stage include only anion exchange material or cation exchange material, and thus remove ...	10/02/2001
6274019	Electrodeionization apparatus Water to be treated (feed water) flows through a series of desalination chambers filled with ion exchange resins on which impurity ions in the feed water are removed. Each desalination chamber consists of a cation-permeable membrane on one side with an an...	08/14/2001
6274018	Electrodeionization apparatus comprising sub-desalination chambers Two sub-desalination chambers d1 and d2 are defined by a cation exchange membrane 3 on one side, an anion exchange membrane 4 on the other side, and an intermediate ion exchange membrane 5 in between and are filled with ion exchange ...	08/14/2001
6221225	Apparatus and process for electrodialysis of salts An apparatus and process produces salts by an electrodialysis operation. The basic electrodialysis apparatus is a cell having a number of compartments separated by ion exchange membranes. A DC source is connected to drive a current through a feed stream p...	04/24/2001
6187162	Electrodeionization apparatus with scaling control First and second stages are used in electrodeionization to purify water including calcium and carbon dioxide and its hydrates. The diluting flow channels of the first stage include only anion exchange material or cation exchange material, and thus remove ...	02/13/2001
6149788	Method and apparatus for preventing scaling in electrodeionization units A method and apparatus is provided for inhibiting scaling in an electrodeionization system and, more particularly, for increasing tolerance to hardness in the feed water to an electrodeionization unit by inhibiting precipitation of scale-forming metallic ...	11/21/2000
6056878	Method and apparatus for reducing scaling in electrodeionization systems and for improving efficiency thereof A method and apparatus for inhibiting scaling in an electrodeionization system or in a combined reverse osmosis/electrodeionization system for water treatment and, more particularly, for increasing tolerance to hardness in the feed water to an electrodeio...	05/02/2000
5851372	Process for demineralizing a liquid containing organic matter and salts in solution A process of demineralizing a liquid containing organic matter and inorganic salts in solution, in which the treatment of the liquid comprises the following steps: the liquid is percolated over a strong cationic ion exchange resin for monovalent ions; bot...	12/22/1998
5837124	Method and apparatus for preventing scale from precipitating in producing deionized water A method for preventing scale from precipitating and an apparatus for producing deionized water are disclosed. The acidic water produced by electrolysis in the electrolysis unit (30) is introduced into a concentrating compartment (19) in the continuous de...	11/17/1998
5766438	Electrolyzer and a method of operating the same In an electrolyzer provided according to this invention, the polarity of electrodes is periodically inverted at very short intervals. This has the effect of allowing gases to be generated uniformly all over the surface of each electrode in the form of ext...	06/16/1998
5736023	Polarity reversal and double reversal electrodeionization apparatus and method Electrodeionization apparatus having a novel polarity reversal protocol designed to provide continuous, high-quality product fluid is described. The protocol involves substitution of a recirculating fluid stream established in an ion-concentrating compart...	04/07/1998
5705046	Process for treating effluent from flue-gas desulfurization system and apparatus therefor A process for treating effluent from a flue-gas desulfurization system wherein the resulting gypsum is removed, comprises filtering the gypsum and fly ash free effluent by a filter, transferring the filtrate to an electrodialyzer wherein cation-exchange m...	01/06/1998
5593563	Electrodeionization process for purifying a liquid In an electrodeionization apparatus having a cathode compartment and an anode compartment for removing ions from a liquid under the influence of a voltage, the cathode compartment includes electron conductive particles such as metal particles and/or carbo...	01/14/1997
5578181	Method for treating waste water containing neutral salts comprising monovalent ions In order to reduce releasing of neutral salts comprising monovalent ions contained in industrial waste effluent to the environment, the waste effluent to be treated is supplied into a prepositive electrodialysis cell comprising ion exchange membranes whic...	11/26/1996
5536384	Separation of sulphides from pulping liquors by electrodialysis A process using an electrodialysis system employing cation-selective membranes and anion-selective membranes, particularly monovalent anion-selective membranes is used to separate kraft pulping liquors into two streams; one that is rich in sulphides (to b...	07/16/1996
5324403	Process for salt extraction from hydrogen-sulphide scrubber solution using electrodialysis This invention relates a method for the selective removal of alkali metal salts of sulphate (SO42-), and thiosulphate (S2 O32-) from hydrogen sulphide (H2 S) scrubber solutions of the liqui...	06/28/1994
5145569	Process for desalting solvent-containing electrolyte solutions by electrodialysis A process for desalting mixtures of water and water-soluble highly active organic solvents, which contain metal salts, which comprises subjecting the mixtures to electrodialysis employing commercially available ion exchanger membranes. The electrodes are ...	09/08/1992
4810340	Process for recovering organic values from aqueous solutions containing both organic values and scale-forming ions An improved process for recovering organic values from aqueous solutions containing scale-forming ions by electrodialysis and fractionation-distillation, wherein an aqueous substantially free of organics is introduced into the concentrate side of the elec...	03/07/1989
4711722	Method for preventing fouling of electrodialysis membrane A method for preventing fouling of an electrodialysis membrane when conducting desalting of an inorganic salt-containing aqueous solution containing electrodialysis membrane-fouling substances, which is characterized by adjusting the pH of the solution to...	12/08/1987
4707240	Method and apparatus for improving the life of an electrode Method and apparatus are disclosed for improving the anodic life of an electrode in an electrodialysis stack which electrode comprises at least in part an area which is anodic during at least part of the duty time of said stack, which stack also comprises...	11/17/1987
4676908	Waste water treatment Waste water streams from the steam-extraction of heavy oils are treated to remove organic contaminants, suspended solids and mineral contaminants, so as to produce a purified water stream of a quality suitable for reuse in steam production. Suspended soli...	06/30/1987
4525259	Method and apparatus for electrodialysis The method and apparatus for rinsing an electrodialysis electrode provides isolation from the fluid being electrodialyzed. The method utilizes the natural circulation of the liquid and provides an exchange between the anode and cathode liquids while maint...	06/25/1985
4311575	Method for high temperature electrodialysis In electrodialysis for desalting or concentrating an electrolyte solution in desalting chambers and concentrating chambers constituted by alternately juxtaposing a plurality of anion and cation exchange membranes between at least a pair of electrodes by s...	01/19/1982
4160713	Process for electro-dialysis In a process for electro-dialysis which comprises passing an electrolyte through dilution chambers and concentration chambers formed between a large number of alternately counterposed anion exchange membranes and cation exchange membranes, and applying an...	07/10/1979
4115225	Electrodialysis cell electrode reversal and anolyte recirculation system An electrode reversal system for an electrodialysis cell is disclosed in which acidic anolyte produced in the anode chamber is collected and simultaneously recirculated through both the anode and cathode chambers. The cathode effluent is removed from the ...	09/19/1978

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Class 204/525 - With prevention of scale buildup or fouling of membrane