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| Number | Title | Issue Date |
| 7108784 | Apparatus for removal and destruction of ammonia from an aqueous medium Methods and apparatuses are provided for the removal and destruction of ammonia from an aqueous medium. The methods and apparatuses include the removal of ammonia from an aqueous medium by contact with either natural or synthetic zeolite. The spent zeolite is re-gen... | 09/19/2006 |
| 7105087 | Hexa-valent chromium removal from aqueous media using ferrous-form zeolite materials Systems and methods are provided for the removal and disposal of chromium form an aqueous medium. The systems and methods include the removal of chromium from a source by contact with either natural or synthetic zeolite that has been modified with a ferrous ion or o... | 09/12/2006 |
| 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 |
| 6551803 | Method for purification of amino acid containing solutions by electrodialysis A process is described for purifying an amino acid-containing solution by means of electrodialysis, wherein an amino acid-containing solution is employed which is obtained from the fermentation for producing at least one amino acid.... | 04/22/2003 |
| 6527932 | Methods for producing or purifying onium hydroxides by means of electrodialysis Methods of preparing or purifying onium hydroxides of the elements N, S or P by electrodialysis involve an electrodialysis apparatus comprising one or more cell units, each cell unit comprising a bipolar membrane and an anion-selective membrane, and a bip... | 03/04/2003 |
| 6517700 | Process for the removal of heat stable amine salts A process is disclosed for removing heat stable amine salts using an electrodialysis process. The process of the present invention can be used to reduce the level of heat stable salts in a lean solvent stream in an acid gas removal process. A base is adde... | 02/11/2003 |
| 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 |
| 6482305 | Electrodialysis water splitting process An electrodialysis water splitting processes incorporates a chromatographic separation step using an amphoteric ion exchange resin to remove contamination salts from a salt solution feedstream and a base product solution. When the chromatographic column i... | 11/19/2002 |
| 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 |
| 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 |
| 6284116 | Process for treating aqueous solutions comprising bases and organic acids Bases and organic acids are simultaneously separated from aqueous solutions comprising bases and organic acids by electrochemically treating aqueous solutions containing these components, particularly the aqueous waste solution obtained from an aldolizati... | 09/04/2001 |
| 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 |
| 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 |
| 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 |
| 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 |
| 5814498 | Process for the recovery of organic acids and ammonia from their salts A process recovers organic acid and ammonia from their salts preferably obtained from microbial fermentation of a saccharide in a nutrient. The fermented materials is passed through a nanofiltration or a chelating resin ion-exchange bed or a combination o... | 09/29/1998 |
| 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 |
| 5766439 | Production and recovery of organic acids A process is described for producing organic acids such as lactic acid. The process includes the steps of producing lactic acid by fermentation, resulting in an aqueous fermentation broth containing lactic acid, and adding a calcium base, such as calcium ... | 06/16/1998 |
| 5753097 | Process for purifying hydroxide compounds In one embodiment, the invention relates to a process for purifying solutions containing a hydroxide compound, including the steps of: (A) providing an electrochemical cell containing an anode, a cathode, a cation selective membrane and a bipolar membrane... | 05/19/1998 |
| 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 |
| 5709790 | Electrochemical process for purifying hydroxide compounds In one embodiment, the invention relates to a process for purifying solutions containing a hydroxide compound, including the steps of: (A) providing an electrochemical cell containing an anode, a cathode, a cation selective membrane and an anion selective... | 01/20/1998 |
| 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 |
| 5681728 | Method and apparatus for the recovery and purification of organic acids The present invention relates to methods and apparatus for reducing the fouling of ion-selective membranes used in the electrodialytic purification of organic acids. More particularly, the present invention relates to the use of nanofiltration and chelati... | 10/28/1997 |
| 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 |
| 5431792 | Method of making hypophosphorous acid Disclosed is a method of making hypophosphorous acid from sodium hypophosphite by performing electrodialytic water splitting upon an aqueous solution of sodium hypophosphite. The process can be tied into an existing process for producing sodium hypophosph... | 07/11/1995 |
| 5415751 | Method of producing acids and alkalis To reuse ashes that are left after burning components contained in a black liquor obtained by digesting wood chips in the step of producing kraft pulps. Acids and alkalis are produced by burning components contained in a black liquor obtained by digesting... | 05/16/1995 |
| 5397445 | Method for producing an acid and/or alkali metal hydroxide A method for producing an acid and/or an alkali metal hydroxide, from a neutral salt by electrodialysis employing a bipolar membrane and an anion exchange membrane and/or a cation exchange membrane, wherein as the anion exchange membrane, an anion exchang... | 03/14/1995 |
| 5352345 | Ion exchange resin regenerant waste recovery and recycling via bipolar membranes The present invention provides an improved process for the regeneration of ion exchange gels and resins. Exhausted regenerating solutions from a either a cationic or anionic exchange column are converted into fresh regenerating solutions via one or a comb... | 10/04/1994 |
| 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 |
| 5281318 | Process for processing a waste etching solution containing a fluorine component and an ammonia component to recover valuables therefrom A process for recovering valuables from a waste etching solution containing a fluorine component and ammonia component is provided comprising recovering respectively a fluorine component and ammonia component in the waste solution and recovering a potassi... | 01/25/1994 |
| 5228962 | Separation/recovery of ammonium salts via electrodialytic water splitting The present invention is an improved process for electrodialytically generating salts of volatile acids and/or bases from a salt stream. The salt of the volatile base may either be generated from a similar salt, or may be recovered from a mixed salt solut... | 07/20/1993 |
| 5221443 | Liberation of organic sulfonic acids Organic sulfonic acids are liberated from aqueous solutions of their salts by a process in which the aqueous organosulfonate solution is subjected to electrodialysis with the aid of an electrodialysis cell which consists of diluate chambers DC, acid chamb... | 06/22/1993 |
| 5211823 | Process for purifying resins utilizing bipolar interface Purified ion exchange resin particles are provided in a bifunctional electrodeionization step having anion depletion compartments containing anion exchange resin particles which are purified and cation depletion compartments containing cation exchange res... | 05/18/1993 |
| 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 |
| 5198086 | Electrodialysis of salts of weak acids and/or weak bases The present invention relates to a method and related apparatus useful to electrodialytically convert the salt of a strong base and a weak acid to base with improved purity; or the salt of a weak base and a strong acid to acid with improved purity.... | 03/30/1993 |
| 5162076 | Method for purification of acids from materials comprising acid and salt A method of separating acid from an aqueous feed stream comprising acid and salt. The method is conducted in an apparatus comprising a bipolar membrane between at least one first anion membrane and at least one second anion membrane.... | 11/10/1992 |
| 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 |
| 5139632 | Recovery of mixed acids from mixed salts A process for recovering concentrated mixed acids comprising HF from mixed salts at a high efficiency is disclosed. The process comprises the steps of providing an electrodialytic water splitter comprising at least one unit cell, each cell comprising a fi... | 08/18/1992 |
| 5135626 | Method for purification of bases from materials comprising base and salt The present invention is a method of recovery of base from material comprising base or acid and salt. The method is conducted in an apparatus comprising a cation membrane between two bipolar membranes.... | 08/04/1992 |
