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| Number | Title | Issue Date |
| 7338600 | Fractional deionization process A liquid treatment process is described for sequential removal of ionic species of progressively decreasing ionic strength without precipitation or “scaling.” An aspect of the invention includes two or more electrodeionization operations within one or more elect... | 03/04/2008 |
| 7288170 | Process for producing a ready-to-use electrolyte A process is intended to allow simple and particularly reliable electrolyte generation and conditioning from metal-containing used electrolytes and/or used process solutions and/or pulverulent metal wastes. For this purpose, waste products containing metal ions from... | 10/30/2007 |
| 7255798 | Recycling of used perfluorosulfonic acid membranes A method for recovering and recycling catalyst coated fuel cell membranes includes dissolving the used membranes in water and solvent, heating the dissolved membranes under pressure and separating the components. Active membranes are produced from the recycled mater... | 08/14/2007 |
| 7214301 | Filter or filter-element for modified electro-dialysis (MED) purposes Filter or filter-element designated for Modified Electro-Dialysis (MED) purposes characterized in that the filter or filter-element comprises a porous, ceramic, mainly uniform material with functional, preferably ion selective groups grafted onto the inner, porous s... | 05/08/2007 |
| 7083772 | Aqueous solution of zinc nitrite and method for production thereof An aqueous zinc nitrite solution which contains substantially no calcium (Ca) ions is provided, in which, in terms of the aqueous zinc nitrite [Zn(NO2)2] solution having an NO2 concentration of 10% by weight, the sodium (Na) ion conc... | 08/01/2006 |
| 6984300 | Method for recovering useful components from electrolytic phosphate chemical treatment bath The present invention provides means for recovering and reusing useful component ions in electrolytic phosphate chemical treatment bath without subjecting them to waste water treatment. In the present invention, a phosphate chemical treatment bath which contains pho... | 01/10/2006 |
| 6878258 | Apparatus and method for removing contaminants from semiconductor copper electroplating baths The present invention generally provides an apparatus and method for removing contaminants from a plating solution. The apparatus generally includes a plating cell having an electrolyte inlet and an electrolyte drain, an electrolyte storage unit in fluid communicati... | 04/12/2005 |
| 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 |
| 6764584 | Process for producing lithium concentrate from brine or seawater Two concentration techniques, adsorption and electrodialysis, are combined to enrich lithium ions in brine from a level of several ppm to about 1.5%. At beginning brine is subjected to an adsorption, so that Li content is increased to 1200-1500 ppm, followed by two ... | 07/20/2004 |
| 6755951 | Electrodialysis of salts for producing acids and bases An electrodialysis cell is operated in the presence of organic compounds that binds or chelates with the multivalent metals to form a metal chelating buffer. Among other things, this binding or chelating reduces power consumption, produces a stable cell operation, a... | 06/29/2004 |
| 6712946 | Electrodialysis of multivalent metal salts A method for electrodialysis is conducted in a multi-compartment, preferably a four compartment, electrodialysis cell configuration wherein an inexpensive source of protons, preferably from a strong inorganic acid enables the conversion of multivalent metal salts in... | 03/30/2004 |
| 6569301 | Cation exchange membrane selectively permeable to monovalent cations and method for its production The present invention provides a cation exchange membrane which has excellent durability, a high limiting current density, a low direct current membrane resistance and excellent selectivity to monovalent cations. In the present invention, a cation exchang... | 05/27/2003 |
| 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 |
| 6471844 | Process for the isolation of aromatic hydroxycarboxylic acids Processes are provided for the electrodialysis of a (di)alkali metal salt of an aromatic hydroxycarboxylic acid to produce a free aromatic hydroxycarboxylic acid and the alkali metal hydroxide, in the presence of a selected alkali metal salt. These variou... | 10/29/2002 |
| 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 |
| 6391177 | High temperature continuous electrodialysis of electroless plating solutions An electrodialytic cell and process for its use in regenerating electroless plating solutions, particularly nickel-hypophosphite electroless plating solutions, are disclosed. The process is capable of operating at high temperatures and in a continuous fas... | 05/21/2002 |
| 6340420 | Methods of treating the oxidation mixture of hydrocarbons to respective dibasic acids This invention relates to methods of controlling the oxidation of hydrocarbons to respective dibasic acids, such as adipic acid for example, by removing the catalyst from the reaction mixture, outside the reaction zone, after the oxidation has taken place... | 01/22/2002 |
| 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 |
| 6214190 | Method for separating a catalyst by membrane electrodialysis The present invention relates to a process for isolating, by membrane electrodialysis, a catalyst from a solution containing it. More precisely, it relates to the isolation of a catalyst used in a homogeneous phase molecular oxidation reaction. The invent... | 04/10/2001 |
| 6200448 | Method of manufacturing nickel hypophosphite by the electro-membrane technique The method of manufacturing nickel hypophosphite from a solution of hexahydrated nickel sulfate and a solution of monohydrated sodium hypophosphite by an electro-membrane technique, consists: a) in introducing respectively the hexahydrated nickel sulfate solut... | 03/13/2001 |
| 6187201 | System for producing ultra-pure water A system for producing ultra-pure water having an electrodialysis unit 1, which has a membrane selectively permeable to monovalent cations and a membrane selectively permeable to monovalent anions, and a reverse osmosis unit 5 which is connected after the... | 02/13/2001 |
| 6045684 | Process and apparatus for the production of an aqueous solution of hydrogen peroxide An on-site process and apparatus for producing hydrogen peroxide at a high efficiency substantially from brine and oxygen-containing gas alone as raw materials while removing alkaline earth metals. Sea water concentrated by an electrodialytic apparatus 2 ... | 04/04/2000 |
| 6036830 | Desalination of aqueous sulphonamide solutions In order to remove the salts (in particular NH4 Cl) present in an aqueous sulphonamide solution (in particular CH3 SO2 NH2), the solution is subjected to a two-compartment electrodialysis. By maintaining the pH ... | 03/14/2000 |
| 6030844 | Method and apparatus for pre-analyzing treatment for subsequent analysis of metal components in volatile alkali solution and non-volatile anion in volatine acid solution and method and apparatus for the subsequent analysis Method of pre-treating a sample for metal analysis, the sample including a volatile alkali, by permeating the volatile alkali through a gas permeable membrane, dissolving the volatile alkali in an absorbent, passing ions through a first cation exchange me... | 02/29/2000 |
| 6017433 | Desalting aqueous streams via filled cell electrodialysis The invention is a process for desalting aqueous solutions, which are initially acidified to a pH of about 3 or less. Then, the acidified solution is fed into a desalting compartment of an electrodeionization cell which contains a suitable ion exchange ma... | 01/25/2000 |
| 5961805 | Method and apparatus for producing deionized water An apparatus for producing deionized water consisting essentially of an electrodialyzer having cation exchange membranes and anion exchange membranes alternately arranged between a cathode and an anode to form demineralizing compartments and concentrating... | 10/05/1999 |
| 5961803 | Leaching process An increasing problem with the pulping chemical recovery system, is the presence of chloride and potassium in the recovery boiler. Chloride and potassium increase inter alia the stickiness of carryover deposits and dust particles to the recovery boiler tu... | 10/05/1999 |
| 5948230 | Electrodialysis including filled cell electrodialysis (Electrodeionization) Improved electrodialysis (ED) stacks are disclosed having one or more components selected from the group: a) cation exchange membranes having ion exchange groups predominantly sulfonic acid groups and a minor amount of weakly acidic and/or weakly basic gr... | 09/07/1999 |
| 5858191 | Electrodeionization apparatus and method An improved electrodeionization apparatus and method are provided. The electrodeionization apparatus includes an ion-concentrating compartment, an ion-depleting compartment, and electrolyte compartments, wherein alternating layers of anion exchange resins... | 01/12/1999 |
| 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 |
| 5792315 | Purifying aqueous effluent from a pulp mill using electro chemical membrane device This invention is related to a process for producing pulp from a cellulosic starting material, wherein an aqueous process effluent is purified from metal impurity cations. This process comprises that the effluent is purified by an electro-chemical membran... | 08/11/1998 |
| 5762774 | Apparatus for the purification of liquids and a method of manufacturing and of operating same A method of manufacturing an apparatus for the electrodeionization of a fluid includes determining the flow rate of the fluid to be deionized, its initial concentration of ionic impurities, a desired post-processing concentration of ionic impurities and a... | 06/09/1998 |
| 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 |
| 5702579 | Process for making ascorbic acid A process for the preparation of ascorbic acid starting from an ascorbate is characterized in that an ascorbate, e.g. sodium ascorbate, dissolved in water is decomposed under the influence of an electric field by means of ion-selective membranes into asco... | 12/30/1997 |
| 5679229 | Electrodialysis including filled cell electrodialysis (electrodeionization) Improved electrodialysis (ED) stacks are disclosed having one or more components selected from the group: a) cation exchange membranes having ion exchange groups predominantly sulfonic acid groups and a minor amount of weakly acidic and/or weakly basic gr... | 10/21/1997 |
| 5626733 | Process for the preparation of keto compounds A process for the preparation of keto compounds from the associated alkali metal salts, in which process protonation is carried out by electrodialysis in a nonaqueous medium without the addition of acid which is foreign to the system, and the keto compoun... | 05/06/1997 |
| 5597466 | Preparation of substantially salt-free aqueous solutions of bisaminoxyalkanes Salt-free aqueous solutions of bisaminoxyalkanes (I) are prepared by a process in which a) a dihaloalkane (II) is converted with a ketoxime (III) in an aqueous solution of a strong mineral base into the alkylene bisoxime ether (IV), b) the alkylene bisoxime et... | 01/28/1997 |
| 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 |
| 5567293 | Electromembrane processes for the treatment of kraft mill electrostatic precipitator catch A process for the recovery of alkali metal hydroxide and acid from the alkali metal salts of monovalent anions which are mixed with the alkali metal salts of multivalent anions employs a water-splitting system composed of bipolar membranes in conjunction ... | 10/22/1996 |
| 5523201 | Method for desalting silver halide emulsion and silver halide emulsion prepared thereby A desalting method of a silver halide emulsion is disclosed, comprising removing soluble salts from the silver halide emulsion by electrodialysis, wherein said electrodialysis is carried out at a pH within a range of &#b1;0.5 of an isoelectric point of a ... | 06/04/1996 |
