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| Number | Title | Issue Date |
| 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 |
| 7144735 | Electrodialysis method and apparatus for trace metal analysis An electrodialysis method and apparatus are provided for treating a sample including trace metals in a matrix. Advantageously, the present invention allows for highly accurate detection of trace contaminants in a solution sample, in particular trace metals, substant... | 12/05/2006 |
| 6830671 | Ion-exchange membrane An ion-exchange membrane having excellent resistance against organic fouling by high molecular weight organic ions etc. and showing low electric resistance is provided. Said ion-exchange membrane is characterized by that a polyether compound containing polyalkylene ... | 12/14/2004 |
| 6800185 | Method for producing basic amino acid solution Herein are disclosed a method for producing a basic amino acid solution which comprises subjecting a solution of a basic amino acid salt to electrodialysis with the use of an electrodialyser equipped with cation exchange membranes and anion exchange membranes in com... | 10/05/2004 |
| 5993629 | Regenerating of acids, particularly of strong organic acids, using bipolar membranes An electrodialysis method using a bipolar membrane (BP) for regenerating acids, wherein a series of base (B), acid (A) and salt (S) compartments are provided between a positive electrode (anode) and a negative electrode (cathode), said compartments being ... | 11/30/1999 |
| 5980724 | Method of electrochemically producing epoxides Described is a method of electrochemically converting -halohydrins, e.g., 1-chloro-2-hydroxypropane and 1,3-dichloro-2-hydroxypropane, to epoxides, e.g., propylene oxide and epichlorohydrin. An electrolytic cell is provided having (1) a catholyte c... | 11/09/1999 |
| 5906722 | Method of converting amine hydrohalide into free amine Describes a method of electrochemically converting amine hydrohalide, e.g., ethyleneamine hydrochloride, into free amine, e.g., free ethyleneamine. A three compartment electrolytic cell is provided having (1) a catholyte compartment containing a cathode a... | 05/25/1999 |
| 5904829 | Method of converting amine hydrohalide into free amine Describes a method of electreochemically converting amine hydrohalide, e.g., amine hydrochloride, into free amine, e.g., free ethyleneamine. An electrolytic cell is provided having (1) a catholyte compartment containing a cathode assembly comprising a cat... | 05/18/1999 |
| 5900133 | Method of converting amine hydrohalide into free amine Describes a method of electrochemically converting amine hydrohalide, e.g., ethyleneamine hydrochloride, into free amine, e.g., free ethyleneamine. A three compartment electrolytic cell is provided having (1) a catholyte compartment containing a cathode a... | 05/04/1999 |
| 5882501 | Method of converting amine hydrohalide into free amine Describes a method of electrochemically converting amine hydrohalide, e.g., ethyleneamine hydrochloride, into free amine, e.g., free ethyleneamine, by charging an aqueous solution of amine hydrohalide to the catholyte compartment of an electrolytic cell, ... | 03/16/1999 |
| 5772013 | Method and apparatus for producing di- and more highly oxidized carboxylic acids A method is disclosed for producing di- and more highly oxidized carboxylic acids from a compound selected from a first group consisting of carbohydrates, carbohydrate derivatives and carbohydrate derivatives having more than one primary alcohol group, co... | 06/30/1998 |
| 5709789 | Electrochemical conversion of nitrogen containing gas to hydroxylamine and hydroxylammonium salts The present invention relates to a method of preparing hydroxylamine in an electrochemical cell, comprising the steps of: providing an electrochemical cell comprising an anode, a cathode, a bipolar membrane positioned between the anode and the cathode, th... | 01/20/1998 |
| 5609742 | Electrolytic process and apparatus for the controlled reduction of inorganic and organic species in aqueous solutions An electrolytic process and apparatus is disclosed for oxidizing or reducing inorganic and organic species, especially in dilute aqueous solutions. The electrolytic reactor includes an anode and cathode in contact with a packed bed of particulate ion exch... | 03/11/1997 |
| 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 |
| 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 |
| 5264097 | Electrodialytic conversion of complexes and salts of metal cations Complexes and salts of metal cations in aqueous solutions are electrodialytically converted into a solution of acids substantially free of metal cations and insoluble metal hydroxides. Metal cations are insolubilized by hydroxyl ions formed in a catholyte... | 11/23/1993 |
| 5194130 | Method to produce sodium citrate using electrodialysis The present invention relates to a method and an apparatus of electodialytically treating an acid such as citric acid to produce a desired salt of the anion of the acid, such as sodium citrate. A cation can be introduced into a solution via a cheap donor ... | 03/16/1993 |
| 5135622 | Electrochemical synthesis of palladium hydroxide compounds This invention embodies a process for synthesizing electrodialythically palladium ammine hydroxide for use in palladium plating baths. The electrodialysis takes place in a cell with a catholyte, a product and an anolyte compartments which are divided by a... | 08/04/1992 |
| 5114554 | Removal of acid from cathodic electrocoating baths by electrodialysis Acid is removed from cathodic electrocoating baths in which electroconductive substrates are being coated with cationic resins present in the form of aqueous dispersions, at least a portion of the coating bath being subjected to an ultrafiltration where t... | 05/19/1992 |
| 5094732 | Process and apparatus for removing nitrates from a water stream during the treatment of process water Process and apparatus for removing nitrates during the treatment of process water, based on an electrodialysis process where, through the use of suitable membranes (3, 4), a preferential migration of nitrate ions NO3-, and thus selec... | 03/10/1992 |
| 5091071 | Removal of acid from cathodic electrocoating baths by electrodialysis Acid is removed from cathodic electrocoating baths by a process in which electroconductive sub-strates are coated with cationic resins present in the form of aqueous dispersions, at least a portion of the coating bath being subjected to an ultrafiltration... | 02/25/1992 |
| 5057197 | Process and apparatus for the removal of undesired components from aqueous feedstocks An efficient process and system for the removal of at least one organic acid from aqueous feed streams.... | 10/15/1991 |
| 5047128 | Electrodialysis cell for removal of excess electrolytes formed during electrodeposition of photoresists coatings This invention provides a means of controlling the composition of electrodepositable photoresists emulsion. The system removes contaminants from the bath which may adversely effect the quality of the deposited coatings and allows for continuous monitoring... | 09/10/1991 |
| 5000832 | Purification of aqueous glyoxal solutions Aqueous glyoxal solutions which contain organic acids are purified by means of a membrane cell comprising two or more compartments by passing the glyoxal solution through at least one of the cell compartments separated from the neighboring compartment(s) ... | 03/19/1991 |
| 4983267 | Water deionization and contaminants removal or degradation A method and device provide for the deionization and contaminants removal or degradation of aqueous liquids, particularly drinking water. The water is caused to flow in a first direction and while flowing it is treated so as to simultaneously effect deion... | 01/08/1991 |
| 4971672 | Removal of acid from cathodic electrocoating baths by electrodialysis Acid is removed from cathodic electrocoating baths by a process in which electroconductive sub-strates are coated with cationic resins present in the form of aqueous dispersions, at least a portion of the coating bath being subjected to an ultrafiltration... | 11/20/1990 |
| 4944852 | Method for purifying a dipeptide ester A method for purifying a dipeptide ester by electrolysis in an electrolytic cell comprising an anode compartment, a cathode compartment and a central compartment partitioned by anion exchange membranes, which comprises supplying an aqueous dipeptide ester... | 07/31/1990 |
| 4938854 | Method for purifying quaternary ammonium hydroxides A process for treating solutions of quaternary ammonium hydroxide containing latent halide to lower the latent halide content of the solution comprises the steps of (A) providing an electrolytic cell comprising an anode and a cathode wherein the cathode c... | 07/03/1990 |
| 4830720 | Method for purifying a dipeptide ester A method for purifying a dipeptide ester by electrolysis in an electrolytic cell comprising an anode compartment, a cathode compartment and a central compartment partitioned by ion exchange membranes, which comprises supplying an aqueous dipeptide ester s... | 05/16/1989 |
| 4806219 | Method of double decomposition of neutral salt Disclosed is a simple and convenient method by which a salt typified by sodium chloride, generally a neutral salt, is decomposed by using a three-compartment electrodialysis cell comprising a special ion-exchange membrane to form an acid and an alkali in ... | 02/21/1989 |
| 4762601 | Copper bath for electroless plating having excess counter-cation and process using same An electroless copper plating bath is improved so as to facilitate its regeneration in an electrodialysis cell. The bath includes elevated amounts of an added salt, preferably as Na salt. The elevated sodium ion level serves as additional counter-cation t... | 08/09/1988 |
| 4758319 | Dialyzing crossflow electrofilter with improved electrode A membrane for dewatering a suspension of solids in a carrier liquid by means of either an electrically augmented vacuum filter (EAVF) or an electrically augmented crossflow device. The EAVF and crossflow devices both include an anodic structure comprisin... | 07/19/1988 |
| 4719128 | Method of and apparatus for bailout elimination and for enhancing plating bath stability in electrosynthesis/electrodialysis electroless copper purification process A forced air, ambient temperature, evaporator coupled to an electroless copper plating bath and to a purification system for replenishing and maintaining the stability of the plating bath, which bath tends to become depleted as the result of the reduction... | 01/12/1988 |
| 4717450 | Removal of chloride from process solutions A method of removing chloride ions in preference to oxidized sulfur ions, in particular sulfate or thiosulphate ions from a process solution containing either or both, or sulfide ions which are first oxidized to sulfate or thiosulphate ions. The method ut... | 01/05/1988 |
| 4702810 | Process and device for adding ions to liquids, particularly aqueous solutions Process and apparatus adds counterions into the aqueous solution of an electrode chamber of an electrolytic desalination or demineralization unit. In the demineralization unit, oppositely charged ions are electrolytically generated within electrode chambe... | 10/27/1987 |
| 4693802 | Electrically augmented vacuum filtration apparatus for producing a dialyzed cake product An electrically augmented vacuum filtration apparatus for dewatering a suspension of solids wherein the transport of ions into the cake product is controlled by provision of a suitable anionic solid polymeric electrolyte arranged to isolate at least one e... | 09/15/1987 |
| 4680098 | Aqueous recovery of cobalt or cobalt and manganese from solution also containing oxygenated aromatic compounds Cobalt and manganese oxidation catalyst metals are recovered from trimellitic anhydride process residue by extracting the residue with water and using the extract solution as a diluting solution in an electrodialyzer the separation stack of which comprise... | 07/14/1987 |
| 4671861 | Measurement and control of net caustic production during electrodialysis A method of and apparatus having utility in an electrodialysis and electrosynthesis process energized by direct eletrical current for the purification and replenishment of an electroless copper plating solution comprises indirectly measuring the hydroxide... | 06/09/1987 |
| 4668361 | Dialyzing electrofilter with improved electrode A system and apparatus for dewatering a suspension of solids in a carrier liquid by means of an electrically augmented vacuum filter (EAVF). The EAVF including an anodic structure comprising an anode, anolyte and a filter membrane for depositing solids fr... | 05/26/1987 |
| 4645579 | Preparation of aqueous hydroxylamine solutions Aqueous solutions of hydroxylamine are prepared from aqueous hydroxylammonium salt solutions by electrodialysis by a method in which the aqueous hydroxylammonium salt solution is fed into the middle zone of an electrolysis cell, which is divided into a ca... | 02/24/1987 |
