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7604724 |
Method for sour gas treatment
A method for selectively removing hydrogen sulfide and carbon dioxide from sour gas by reacting the hydrogen sulfide and carbon dioxide in the sour gas with sodium hydroxide is disclosed. Also...
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7582198 |
Water treatment system and method
A method and apparatus for producing purified water. An electrochemical system can be configured to pass product water through depletion compartments as well as a cathode compartment. An...
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7544278 |
Ion exchange membranes, methods and processes for production thereof and uses in specific applications
The invention includes novel anion exchange membranes formed by in situ polymerization of at least one monomer, polymer or copolymer on a woven support membrane and their methods of formation. The...
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7501064 |
Integrated electro-pressure membrane deionization system
An integrated treatment system using electrodialysis and pressure-driven membranes for deionizing and decontaminating liquids to a near-pure quality for use or reuse in industrial or municipal...
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7459088 |
Water desalination process and apparatus
A process and system for purifying water is disclosed. For example, in one embodiment, the process may be used to remove a divalent salt, such as calcium sulfate, from a water source in order to...
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7291274 |
Method of deionising and clarifying the aqueous medium used in an electrical discharge machine and the product used in said method
Deionisation and clarification process of the aqueous medium used in an electroerosion machine and product for this process, where the electroerosion machines are comprised of a purification...
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7083730 |
Production of purified water and high value chemicals from salt water
Sodium chloride and purified water are recovered by treating salt water that contains sodium chloride with an integrated reverse osmosis and electrodialysis system, which includes an...
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7049020 |
Composites and composite membranes
The invention relates to a composite or a composite membrane consisting of an ionomer and of an inorganic optionally functionalized phyllosilicate. The isomer can be: (a) a cation exchange polymer;...
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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...
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6787021 |
Purification of onium hydroxides by electrodialysis
This invention relates to a process for improving the purity of an aqueous onium hydroxide solution. In particular, the invention relates to a process for improving the purity of aqueous onium...
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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...
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6537436 |
System for electrodialysis treatment of liquids
An electrodialysis treatment system utilizing a plurality of disparate layers of an electrodialysis cell stack for separation of components in liquid mixtures. The system for electrodialysis...
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6379517 |
Method and device for electrodialytic regeneration of an electroless metal deposition bath
A method and a device for the regeneration of an electroless metal deposition bath containing hypophosphite ions by electrodialysis is described. The method according to the invention and the...
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6328894 |
Processes of purifying a dispersion and making inkjet inks
A process to purify and classify a dispersion containing stabilized particles having counterions and ions as well as free species is disclosed. The solution may comprise an aqueous media, a solvent...
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6270672 |
Devices and methods for removing pathogens from biological fluids
A method for removing pathogens from biological liquids and an apparatus for performing such a method, said method comprising the steps of providing a biological liquid, wherein pathogens are...
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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...
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6217743 |
Process for recovering organic hydroxides from waste solutions
In one embodiment, the present invention relates to a process for recovering an onium compound from waste solutions or synthetic solutions containing the onium compound and impurities including the...
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6187570 |
Electrodialysis methods for purification and recovery of gluconic acid derivatives
A process for purifying and concentrating a gluconic acid derivative, such as 2-keto-L-gulonic acid, comprising introducing a non-viable and/or acidified fermentation medium or an in-vitro reactor...
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6120673 |
Method and device for regenerating tin-plating solutions
The invention relates to a method and a device for regenerating exhausted tin-plating solutions which contain tin and copper ions, free complexing agent and complexing agent bound to the copper...
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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....
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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...
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6024855 |
Electrosynthesis of hydroxylammonium salts and hydroxylamine using a mediator
In one embodiment, the present invention relates to a method of preparing a hydroxylammonium salt, involving the steps of: providing an electrochemical cell containing an anode, a cathode, and a...
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5968338 |
Process for recovering onium hydroxides from solutions containing onium compounds
In one embodiment, the present invention relates to a process for recovering an onium hydroxide from a solution containing an onium compound, including contacting the solution with a cation...
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5904823 |
Methods of purifying hydroxylamine solutions and converting hydroxylamine salts to hydroxylamine
In one embodiment, the present invention provides a method of preparing hydroxylamine from a hydroxylammonium salt solution, including providing an electrochemical cell containing an anode, a...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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5575901 |
Process for preparing organic and inorganic hydroxides or alkoxides or ammonia or organic amines from the corresponding salts by electrolysis
A process is described for preparing organic and inorganic hydroxides or alkoxides, or ammonia or organic amines from the corresponding salts in an electrolysis cell which comprises an anolyte...
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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...
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5437774 |
High molecular weight electrodialysis
A charged first molecular species is separated from a second molecular species by selectively passing one of the species through a separation membrane under the influence of an electrical...
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5433833 |
Process for the preparation of glycerophospholipids
A process for fractionating deacylated glycerophospholipids of the formula (I): ##STR1## wherein R is a negative charge; a hydrogen atom; a CH 2 CH 2 NR 1 R 2 residue wherein R 1 and R 2 ,...
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5419821 |
Process and equipment for reforming and maintaining electroless metal baths
Process and equipment for reforming and maintaining the chemistry of an electroless metal bath, particularly an electroless nickel bath is disclosed.
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5338420 |
Process for preparing high α-glycosyl-L-ascorbic acid, and separation system for the process
A high α-glycosyl-L-ascorbic acid content product is prepared by subjecting an aqueous solution containing α-glycosylL-ascorbic acid together with L-ascorbic acid and/or a saccharide to...
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5300204 |
Method for hydrogen ion-selective electrodialysis
A method for hydrogen ion-selective electrodialysis, wherein from an aqueous solution containing hydrogen ions on an anode side, the hydrogen ions are selectively permitted to permeate through a...
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5098532 |
Process for producing sodium hydroxide and ammonium sulfate from sodium sulfate
A process for producing sodium hydroxide and ammonium sulfate by electrolysing an aqueous solution of sodium sulfate is disclosed. The process is carried out in a three-compartment electrolytic...
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5045204 |
Method and apparatus for generating a high purity chromatography eluent
A method and apparatus has been provided for generating a high purity aqueous stream with selected ionic species--either cation (e.g. sodium) or anion (e.g. sulfate) and suitable for use as a...
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4999098 |
Modified membrane suppressor and method for use
A suppressor for use in ion chromatography including at least an effluent flow channel separated by a charged membrane from a suppressor flow channel. A screen of the same charge as the membrane is...
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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...
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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...
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4880513 |
Method and apparatus for generating acid and base regenerants and the use thereof to regenerate ion-exchange resins
A method and apparatus for generating acid and base regenerant solutions by utilization of a bipolar membrane electrodialysis stack. A mineral-containing salt solution is continuously circulated...
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4861447 |
Process for reducing corrosive impurities in sulfolane used for extracting aromatic hydrocarbons
A process is disclosed for reducing the level of corrosive impurities in sulfolane solution originating from a process for the extraction of aromatic hydrocarbons from petroleum, which process...
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4857343 |
Process for the low temperature pasteurization of liquid comestibles
Liquid comestibles are electrolytically treated to lower the pH thereof and the electrolytically treated liquid comestible is pasteurizable at temperatures lower than those normally used to effect...
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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...
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4707234 |
Method for separating an acid and an alkali from an aqueous solution of a salt
A method for separating an acid and an alkali from an aqueous solution of a salt by an ion exchange membrane electrolysis wherein anion and cation exchange membranes are used as diaphragms and...
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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...
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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...
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