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| Number | Title | Issue Date |
| 7390386 | Aqueous stream purifier and method of use An electrolytic method is provided for purifying an aqueous stream, including at least one contaminant ion. In one embodiment, the eluent stream flows through a purifying flow channel, including ion exchange bed, an electric field is applied through the flowing elue... | 06/24/2008 |
| 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 |
| 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 |
| 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 |
| 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 |
| 6627061 | 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 membranes. A DC source is connected to drive a current through a feed stream passing throug... | 09/30/2003 |
| 6444107 | Method and device for the simultaneous production of acid and base of high purity An electrodialytic method and device for the simultaneous production of acids and bases of high purity and higher concentration operates by splitting corresponding salts in aqueous solution using an electrolysis cell. The electrolysis cell includes a cath... | 09/03/2002 |
| 6444108 | Process for isolation of dicarboxylic acids and hydroxycarboxlic acids A first process involves the partial electrodialysis of a dialkali metal salt of an aromatic hydroxycarboxylic acid or a dicarboxylic acid to produce the approximate monoalkali metal salt and the alkali metal hydroxide. The monoalkali metal salt is then t... | 09/03/2002 |
| 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 |
| 6319382 | Fermentative production and isolation of lactic acid A method for fermentation of lactic acid from a sugar-containing fermentation liquid in a fermentor by means of lactic acid-forming bacteria, in which whey protein is present or is added as a nutrient substrate for the lactic acid-forming bacteria, wherei... | 11/20/2001 |
| 6224731 | 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 membranes. A DC source is connected to drive a current through a feed stream passing throug... | 05/01/2001 |
| 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 |
| 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 |
| 6110342 | Process for production of amino acid hydrochloride and caustic via electrodialysis water splitting The invention uses a stack of three compartment electrodialysis cells in a process for the production amino acid hydrochloride and an alkali. The electrodialysis cell contains bipolar, cation and anion membranes which are arranged to form acid, base and s... | 08/29/2000 |
| 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 |
| 5928488 | Electrolytic sodium sulfate salt splitter comprising a polymeric ion conductor The invention relates to an electrochemical process for the production of sodium hydroxide and sulfuric acid from aqueous sodium sulfate solutions, said process comprising the feeding of an aqueous sodium sulfate solution into a salt splitter device compr... | 07/27/1999 |
| 5849984 | Method and system for treating waste nitrocellulose A method for treating waste nitrocellulose, the method comprising the steps f treating nitrocellulose with acid in a hydrolysis process to break the nitrocellulose down to glucose, recovering a majority of the acid by electrodialysis, neutralizing a remain... | 12/15/1998 |
| 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 |
| 5725748 | Process and installation for treating cellulose waste lye In a process for an electrochemical treatment of cellulose waste lye, mass transport takes place through a diaphragm or membrane between a cathode chamber and an anode chamber, and optionally through a middle chamber. Cationogenic components are removed f... | 03/10/1998 |
| 5578182 | Electrolytic production of hypophosphorous acid Methods for preparing hypophosphorous acid are disclosed comprising contacting an insoluble anode with an aqueous solution of hypophosphite anions and applying a current through the insoluble anode to a cathode in electrical contact with the aqueous solut... | 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 |
| 5466352 | Method and apparatus for processing waste sulfuric acid A method for processing waste sulfuric acid which is contaminated with halides and has an acid content up to 40% which comprises subjecting the waste sulfuric acid to an electrodialysis in which the electric field causes the univalent halides to permeate ... | 11/14/1995 |
| 5407547 | Process for production of acidified process streams A process for producing chloric acid, which involves introducing a metal chlorate solution and an acid into separate compartments of an electrodialysis cell to produce a chloric acid solution.... | 04/18/1995 |
| 5268079 | Process for the isolation and purification of free acids, starting from their salts, by electrodialysis Process for the isolation and purification of free acids, starting from their salts, by electrodialysis which involves the use of: i) an electrolytic cell of four compartments, in which the two compartments adjacent to the two electrodes are separated from the... | 12/07/1993 |
| 5207879 | Bipolar membrane stack and method for production of low chloride sodium hydroxide A method and bipolar membrane stack for the generation of acid and base solutions from a salt by electrodialysis. The unit cells of the stack comprise a novel arrangement of membranes which provide four liquid flow channels. One of the channels has circul... | 05/04/1993 |
| 4740281 | Recovery of acids from materials comprising acid and salt We have discovered an improved, energy efficient method for recovering and regenerating acid from a solution comprising acid and salt. The process comprises of the steps of supplying a solution comprising salt and a first concentration of acid to a first ... | 04/26/1988 |
| 4253928 | Process for sour water treatment A process for sour water treatment in which the sour components are removed from a sour water stream in an electrodialysis step in which the sour water stream becomes the dilute stream. A resulting concentrate stream, richer in the sour components than th... | 03/03/1981 |
| 4238306 | Electrodialysis process for the separation of non-essential amino acids from derivatives thereof The invention provides a process for the separation, by electrodialysis, of a mixed aqueous solution containing a non-essential amino acid and a derivative of that acid in ionic form, into at least two separate product solutions of acid and derivative res... | 12/09/1980 |
| 4144158 | Process for manufacture of anhydrous hydrogen fluoride and finely divided silica from fluosilicic acid An improved process is described for converting aqueous fluosilicic acid waste product into anhydrous hydrogen fluoride and finely divided silica in which aqueous fluosilicic acid is pyrolyzed to produce silica and a dilute aqueous solution of hydrogen fl... | 03/13/1979 |
| 3935086 | Electrodialysis process A specific class of anionic ion-exchange membranes, comprising a crosslinked vinyl imidazole polymer or copolymer film, is suitable for use in electrodialysis process by use of ion-exchange membranes of an aqueous solution containing organic contaminating... | 01/27/1976 |
