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| Number | Title | Issue Date |
| 7344629 | Selectable ion concentrations with electrolytic ion exchange An apparatus to treat an influent solution comprising ions to obtain a selectable ion concentration in an effluent solution. The apparatus comprises an electrochemical cell comprising a housing comprising first and second electrodes. A water-splitting ion exchange m... | 03/18/2008 |
| 7101468 | End box of an electrodialyser, electrodialyser comprising same and electrodialysis method Electrodialysis device endbox comprising a vertical electrode (7) and a selectively ion-permeable membrane (10) which is arranged vertically, facing the electrode, and separated from the latter by a vertical passage (19) Electrodialysis d... | 09/05/2006 |
| 6952603 | Subcutaneous analyte sensor Assembly and method for measuring the concentration of an analyte in a biological matrix. The assembly includes an implantable optical-sensing element that comprises a body, and a membrane mounted on the body in a manner such that the membrane and the body define a ... | 10/04/2005 |
| 6924318 | Method for making a bipolar membrane and use of resulting bipolar membrane A process for producing a bipolar membrane is described in which a cationic membrane undergoes a treatment with a salt from a group 8 metal, an anionic membrane undergoes a treatment with a salt of a transition metal not belonging to group 8, and then the two membra... | 08/02/2005 |
| 6596137 | Bipolar membrane A bipolar membrane which exhibits a low water dissociation voltage for an extended period of time under a high current density condition, and a high current efficiency, without developing blister. The bipolar membrane comprises a cation-exchange membrane ... | 07/22/2003 |
| 6554990 | Process for the manufacture of alkali metal hydroxide Process for the manufacture of alkali metal hydroxide, according to which an electrodialysis cell containing three compartments is used, an aqueous alkali metal halide solution is circulated in a saline compartment of the cell, delimited between an anioni... | 04/29/2003 |
| 6294066 | Apparatus and process for electrodialysis of salts An apparatus and the 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 th... | 09/25/2001 |
| 6241866 | Electrodeionization apparatus with fixed ion exchange materials Electrodeionization apparatus for purifying water that includes a cathode, an anode, and a plurality of alternating anion permeable membranes and cation permeable membranes between the cathode and anode that define concentrating and diluting flow channels... | 06/05/2001 |
| 6217733 | Bipolar membrane and method for fabricating such bipolar membrane A bipolar membrane, usable for electrodialysis of aqueous electrolytes, comprises two ion exchange membranes, respectively anionic and cationic, juxtaposed along a common surface, wherein, along said common surface, a gel based on hydrated metal sulpate a... | 04/17/2001 |
| 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 |
| 5972191 | Electrodialysis apparatus A gasket for an electrodialysis cell assembly has a series flow path comprising a plurality of flow path sections joined by restrictor sections. Each of the flow path sections has a relatively wide width. The restrictor has less than the wide width so tha... | 10/26/1999 |
| 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 |
| 5849167 | Method for making a bipolar membrane Process for the manufacture of a bipolar membrane, according to which an anionic membrane is joined side by side to a cationic membrane, the membranes having been subjected beforehand to a conditioning pretreatment, the conditioning pretreatment of the an... | 12/15/1998 |
| 5788826 | Electrochemically assisted ion exchange A electrochemical cell for removing ions from a solution stream comprises a housing having first and second electrodes. At least one water-splitting ion exchange membrane is positioned between the electrodes, the water-splitting membrane comprising (i) a ... | 08/04/1998 |
| 5725749 | Process for the separation of lactulose The invention relates to a process for the separation of lactulose from a mixture of lactulose and lactose in the presence of a weak acid capable of reversibly forming a complex with lactulose, by using an electrodialysis equipment including an anode and ... | 03/10/1998 |
| 5645703 | Electrodialysis-based separation process for salt recovery and recycling from waste water A method for recovering salt from a process stream containing organic contaminants is provided, comprising directing the waste stream to a desalting electrodialysis unit so as to create a concentrated and purified salt permeate and an organic contaminants... | 07/08/1997 |
| 5401408 | Bipolar membrane A bipolar membrane comprising a cation exchange membrane, an anion exchange membrane and an inorganic ion exchanger layer having a thickness of from 0.01 to 100 μm present at the interface between the cation exchange membrane and the anion exchange membr... | 03/28/1995 |
| 5380413 | Process for the manufacture of a bipolar membrane and process for the manufacture of an aqueous alkali metal hydroxide solution Process for the manufacture of a bipolar membrane, according to which a cationic membrane is treated with a compound of a polyvalent metal and with an aqueous alkali metal hydroxide solution comprising lithium hydroxide and is then joined side by side to ... | 01/10/1995 |
| 5294316 | Process and apparatus for electrodialysis of an alkali sulfate containing aqueous solution There is disclosed a process for the electrodialysis of alkali sulfate-containing aqueous solutions in stages, by conducting these solutions through a plurality of electrodialytic cells operating in series. The electrodialytic cells include acid and base ... | 03/15/1994 |
| 5288385 | Supported, mechanically stable bipolar membrane for electrodialysis A supported, mechanically stable bipolar membrane for electrodialysis having a cation-exchange layer on one side and an anion-exchange layer on the other side of a single sheet of woven fabric. The cation exchange layer is heterogeneous, the anion exchang... | 02/22/1994 |
| 5288378 | Guard membranes for use in electrodialysis cells The present invention relates to an improved apparatus of the type containing membranes which are selectively permeable to ion transport and a related method. The apparatus comprises at least one guard membrane located adjacent to a first membrane. A cond... | 02/22/1994 |
| 5227040 | High performance bipolar membranes A low electrical resistance bipolar membrane formed by the conjoining of treated anion and cation exchange membranes is disclosed. The treatment comprises contacting the membranes with an aqueous solution of at least one cation prior to conjoining and con... | 07/13/1993 |
| 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 |
| 5200046 | Apparatus and method for electrodialytic treatment of salts to produce acid and/or base of improved purity The present invention relates to a method and related apparatus useful to electrodialytically convert salt to acid and/or base of improved purity. The apparatus comprises an electrodialytic water splitting apparatus comprised of at least one unit cell. Ea... | 04/06/1993 |
| 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 |
| 5160594 | Apparatus and methods for isoelectric focusing of amphoteric substances incorporating ion selective membranes in electrode chambers The present invention includes novel isoelectric focusing cells and methods for isoelectric focusing of amphoteric substances within fluids containing carrier ampholytes which inhibit the phenomena known as spiking or acid notching. The apparatus includes... | 11/03/1992 |
| 5126026 | Guard membranes for use in electrodialysis cells The present invention relates to an improved apparatus of the type containing membranes which are selectively permeable to ion transport and a related method. The apparatus comprises at least one guard membrane located adjacent to a first membrane. The ap... | 06/30/1992 |
| 4995956 | Method and apparatus to control a salt stream to be treated in an electrodialytic water splitter The present invention is a method and apparatus of controlling a raw salt stream to be treated in an electrodialytical water splitter. An aqueous salt feed stream is fed to an electrodialysis water splitter and a dilute salt stream is withdrawn from the w... | 02/26/1991 |
| 4969983 | Apparatus and process for the removal of acidic and basic gases from fluid mixtures using bipolar membranes An apparatus containing a multiplicity of three chamber units comprising a combination of ion exchange membranes and bipolar membranes with certain of said chambers containing a fluid permeable filler of ion-exchange material. The apparatus can be used in... | 11/13/1990 |
| 4871431 | Apparatus for the removal of dissolved solids from liquids using bipolar membranes An apparatus containing a multiplicity of two or three chamber units comprising a combination of ion exchange membranes and bipolar membranes with certain of said chambers containing a filler of ion-exchange material. The apparatus can be used to remove w... | 10/03/1989 |
| 4766161 | Bipolar membranes and methods of making same Bipolar membranes are disclosed which exhibit high permselectivity, good mechanical strength, ability to operate at high current density, low potential drop and long-term stability. Essential to the production of bipolar membranes with these properties is... | 08/23/1988 |
| 4670125 | Production of bipolar membranes A bipolar membrane is produced by fastening an anion exchange membrane to a cation exchange membrane with the aid of an ion-permeable adhesive, by a process in which an aqueous solution of a polyvinylamine is used as the adhesive, and the bipolar membrane... | 06/02/1987 |
| 4661224 | Process and apparatus for electrically desorbing components selectively sorbed on an electrolytically conducting barrier Processes and apparatuses are described for recovering components dispersed in an aqueous solution comprising contacting said solution as a first solution with an electrically conducting barrier, diaphragm or membrane which has a high affinity for at leas... | 04/28/1987 |
| 4608141 | Multichamber two-compartment electrodialytic water splitter and method of using same for basification of aqueous soluble salts A basified aqueous salt solution and an aqueous acid are generated in a multichamber two-compartment electrodialytic water splitter having unit cells comprised of a bipolar membrane, a first anion permselective membrane and at least one additional substan... | 08/26/1986 |
| 4584075 | Process and apparatus for electrically desorbing components selectively sorbed on an electrolytically conducting barrier Processes and apparatuses are described for recovering components dispersed in an aqueous solution comprising contacting said solution as a first solution with an electrically conducting barrier, diaphragm or membrane which has a high affinity for at leas... | 04/22/1986 |
| 4584077 | Process for recovering sodium carbonate from trona and other mixtures of sodium carbonate and sodium bicarbonate A process and a system for converting materials comprising sodium carbonate and sodium bicarbonate, such as dry-mined or subterranean deposits of trona, into a liquid comprising sodium carbonate substantially free of sodium bicarbonate. The process and th... | 04/22/1986 |
| 4549946 | Process and an electrodialytic cell for electrodialytically regenerating a spent electroless copper plating bath A process and electrodialytic cell for electrodialytically regenerating an aqueous, spent electroless copper plating bath which contains alkali metal salts as reaction products of the electroless plating process. In the process, the spent copper plating b... | 10/29/1985 |
| 4536269 | Multichamber two-compartment electrodialytic water splitter and method of using same for acidification of aqueous soluble salts An apparatus is disclosed for generating an acidified aqueous salt solution and an aqueous base in a multichamber two-compartment electrodialytic water splitter which comprises alternating bipolar and first cation permselective membranes and at least one ... | 08/20/1985 |
| 4504373 | Electrodialytic water splitting process and apparatus for conversion of alkali metal sulfate values derived from spent rayon spin baths A process and apparatus for converting alkali metal sulfate values, such as sodium or potassium sulfate values in spent rayon spin bath liquors, into alkali metal hydroxide and alkali metal sulfate/sulfuric acid by using two- or three-compartment electrod... | 03/12/1985 |
| 4284492 | Reverse osmosis electrodialysis combined means The disclosed apparatus is a combined reverse osmosis electrodialysis assembly having osmotic membranes of anionic-cationic bilaminate ion-exchange composition and having electrodes supplying electrical current which effects water-splitting at the membran... | 08/18/1981 |
