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7625540 |
Fluorine removal by ion exchange
A method for removing fluorine gas from a selected environment comprises contacting the fluorine gas with water to generate a solution of hydrofluoric acid and contacting the solution of...
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7560083 |
Method for removing water molecules from vacuum chamber, program for executing the method, and storage medium storing the program
A method for removing water molecules from a vacuum chamber for carrying out a process on a target object in vacuum includes the steps of introducing into the vacuum chamber a water molecule...
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7470413 |
Fluorine removal by ion exchange
A method for removing fluorine gas from a selected environment comprises contacting the fluorine gas with water to generate a solution of hydrofluoric acid and contacting the solution of...
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7413722 |
Method and apparatus for manufacturing nitrogen trifluoride
A method and apparatus for manufacture of NF 3 by gas-liquid phase reaction of fluorine and ammonia in molten ammonium acid fluoride (AAF) in a static reactor in which the reactants are conveyed...
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7371363 |
Methods of purifying hydrogen fluoride
Provided are methods of producing anhydrous hydrogen fluoride comprising: providing a mixture comprising hydrogen fluoride and at least one halogenated hydrocarbon; and extracting hydrogen fluoride...
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7361795 |
Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride
The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluorobutane (HFC-365) and hydrogen fluoride and a process for separating the azeotrope-like mixtures. The...
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7311890 |
Process for the production of fluorinated organic compounds and fluorinating agents
A process for the production of a fluorinated organic compound, characterized by fluorinating an organic compound having a hydrogen atoms using IF 5 ; and a novel fluorination process for...
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7083773 |
Method for producing nitrogen trifluoride using jet-loop reactors
Nitrogen trifluoride is produced with a high yield by the method comprising forming a fast stream of micro droplets of a fused ammonium fluoride salt by rapidly ejecting the fused ammonium fluoride...
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7063823 |
Depleted UF6 processing plant and method for processing depleted UF6
A depleted UF 6 processing plant including a first fluidized bed reactor configured to react depleted UF 6 with steam to produce UO 2 F 2 and hydrogen fluoride, a second fluidized bed reactor...
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7045107 |
Process for the production of nitrogen trifluoride
The present invention is directed to an improved reaction process that allows for the achievement of excellent NF 3 production yields, while minimizing the amount of unreacted fluorine exiting...
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7021487 |
Processing method for high pressure gas container and halogen containing gas filled in said container
A metal container to be filled with a halogen containing gas, with the inner surface processed with a polishing agent. The gas has a reduced purity decline by the increase of the water content or...
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7014824 |
Method for purifying process waste gases
The present invention relates to a method for purifying process waste gases by introducing them into a waste gas purification system that includes a reaction chamber and by post-treating the...
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6998054 |
Selective fluoride and ammonia removal by chromatographic separation of wastewater
A process for fluoride removal from wastewater streams produced during industrial operation for further industrial use or to comply with environmental regulations. The process segregates the...
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6984366 |
Method for nitrogen trifluoride production
A method for the production of nitrogen trifluoride from a fluorine reactant and an ammonium ion source that is dispersed within a liquid phase reaction mixture containing one or more...
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6863780 |
Process of separating/purifying pentafluoropropane
There is provided an azeotropic mixture having 1,1,1,3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture of...
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6858198 |
Method for regulating water concentration in a process stream
Provided is a method for regulating the concentration of water in the acid feed stream in a process for the production of HF by the reaction with a fluorine containing material, the method...
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6841140 |
Method and apparatus for producing hydrogen fluoride
As to a reactor which is used in a process for producing hydrogen fluoride through a reaction of fluorite with sulfuric acid, and which comprises means for applying a shearing force to a content...
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6821351 |
Hydrofluoric acid generating composition and method of treating surfaces
The present invention relates to compositions, kits and processes for the brightening of metal surfaces by the application of the chemical compositions. These compositions act to release...
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6790428 |
Process for the reduction or elimination of NH3/HF byproduct in the manufacture of nitrogen trifluoride
A process for reducing or eliminating NH 3 /HF/MFz liquid waste melt in the manufacture of NF 3 is provided which includes the steps of providing an NF 3 reactor for a reaction of F 2 with a...
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6673326 |
Catalytic processes for the reduction of perfluorinated compounds and hydrofluorocarbons
A process for reducing perfluorinated compounds and/or hydrofluorocarbon compounds in a sample uses a catalyst made from aluminum oxide (Al 2 O 3 ), and one or more enhancers selected from the...
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6660893 |
Hydrogen fluoride recovery process
A process for separating and recovering hydrogen fluoride from a mixture with an organic compound especially a fluorine-containing compound by extraction with a solution of an alkali metal fluoride...
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6605193 |
Recovery of HFC-32
A method for isolating 32 from a crude mixture containing HCl and an azeotropic mixture of 32 and HF is provided without the need to isolate any HF azeotrope.
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6602480 |
Method for treating waste gas containing fluorochemical
A method for decomposing a fluorine-containing compound by contacting an exhaust gas 1 containing a fluorine-containing compound, such as C 2 F 6 , with aluminum oxide 3 , such as γ-alumina,...
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6540882 |
Processes for the synthesis of pentafluorobutane and the separation of hydrogen fluoride and pentafluorobutane mixtures
The invention relates to a process of separation of mixtures containing HFC-365mfc/HF azeotropic compositions by two distillations at different pressures, as well as to a process of synthesis of...
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6521199 |
Regeneration of onium fluoride-HF adducts
Hydrogen fluoride adducts and ammonium fluorides are used for fluorinating acid chlorides and halocarbon compounds such as chloroalkanes or chloronated ethers. The used adducts can be regenerated...
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6482979 |
Perfluorinated acid fluorides and preparation thereof
A method for the preparation of a perfluorinated acid fluoride (especially 3-alkoxy propionic acid fluoride) is provided. The method results in high yields of the acid fluoride.
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6468490 |
Abatement of fluorine gas from effluent
An effluent abatement system 200 that may be used to abate F 2 gas content of effluent exhausted from a process chamber 35, such as effluent from a CVD chamber cleaning process includes a...
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6428764 |
Process for the production of calcium fluoride
A process is disclosed for producing calcium fluoride. The process comprises (a) mixing phosphate rock with aqueous H 2 SiF 6 at ambient temperature for at least one hour; (b) nucleating the...
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6423290 |
Method for recovering an organic solvent from an acidic waste stream such as in integrated chip manufacturing
An organic solvent is separated from a waste stream comprising hydrofluoric acid, an organic solvent and etchant contaminants. The process comprises separating the hydrofluoric acid by subjecting...
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6387340 |
Manufacturing method for lithium hexafluoro phosphate
A method of preparing lithium hexafluoro phosphate (LiPF 6 ) using phosphorous pentachloride (PCl 5 ), lithium chloride (LiCl), and hydrogen fluoride (HF) as raw materials. The method includes the...
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6375808 |
Process for producing difluoromethane
A process for refining difluoromethane by removing hydrogen fluoride, which is contained in difluoromethane difficult to remove. The process involves distilling a mixture of difluoromethane with...
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6365122 |
Process for manufacturing potassium sulfate fertilizer and other metal sulfates
A new process of preparing potassium sulfate fertilizer and other metal sulfates from the chlorides and other halides of these metals. The process utilizes the discovery that sulfur dioxide or...
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6355221 |
Process for removing soluble fluoride from a waste solution containing the same
The present invention relates to a process for recovery of particulate calcium fluoride from a waste solution containing soluble fluoride. More specifically, the invention relates to a process for...
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6352677 |
Process to produce commercial grade anhydrous hydrogen fluoride (AHF) and uranium oxide from the delfuorination of uranium hexafluoride (UF6)
The invention relates to a method for recovering products from the defluorination of uranium hexafluoride. Recovered are a commercial grade anhydrous hydrogen fluoride and triuranium oxide through...
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6350425 |
On-site generation of ultra-high-purity buffered-HF and ammonium fluoride
Provided is a novel method and system for preparing ultra-high-purity buffered-hydrofluoric acid or ammonium fluoride controlled concentration The method comprises bubbling purified ammonia vapor...
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6350426 |
Method of determining component concentrations in three-component mixture and method of continuous production of hydrogen fluoride using the method
A method of quickly and safely determining the component concentrations of a three-component mixture comprising substantially sulfuric acid, hydrogen fluoride and water, which comprises measuring...
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6346227 |
Process for preparing pure hydrofluoric acid
The novel process for preparing pure hydrofluoric acid or pure hydrogen fluoride is characterized in that, after pretreatment by distillatioil/oxidation, a two-stage scrub is carried out using...
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6294055 |
Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms
Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms, by extraction using an organic solvent.
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6224844 |
Process for the production of calcium fluoride
A process is disclosed for producing calcium fluoride comprising: (a) mixing aqueous H 3 PO 4 with aqueous H 2 SiF 6 to form a mixture such that the concentration of H 3 PO 4 is at least...
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RE37042 |
Electrochemical conversion of anhydrous hydrogen halide to halogen gas using a cation-transporting membrane
The invention relates to a process for electrochemically converting anhydrous hydrogen halide, such as hydrogen chloride, hydrogen fluoride, hydrogen bromide and hydrogen iodide, to essentially dry...
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6183623 |
Electrochemical conversion of anhydrous hydrogen halide to halogen gas using an ionically conducting membrane
The invention relates to a process for electrochemically converting anhydrous hydrogen halide, such as hydrogen chloride, hydrogen fluoride, hydrogen bromide and hydrogen iodide, to essentially dry...
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6177058 |
Hydrogen fluoride compositions
The present invention provides compositions that are intimate mixtures of hydrogen fluoride and a polymer. The compositions of the invention are less hazardous and, therefore, more conveniently...
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6123908 |
Method of treating spent potliner material from aluminum reduction cells
A process of treating spent potliner material from aluminum reduction cells and recovering useful products. In the process of the present invention, spent potliner material is introduced into an...
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6074623 |
Process for thermal destruction of spent potliners
Spent potliners from the aluminum processing industry are destroyed by gasification technology to produce an inert vitreous frit and useful gases including hydrogen fluoride, hydrogen and carbon...
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6063356 |
On-site manufacture of ultra-high-purity hydrofluoric acid for semiconductor processing
A system for purification and generation of hydrofluoric acid on-site at a semiconductor device fabrication facility. An evaporation stage (optionally with arsenic oxidation) is followed by a...
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6060031 |
Method for neutralizing acid gases from laser exhaust
The device and method of the invention provide a neutralizing compound that reacts with acid gases generated in laser exhaust to yield an insoluble non-toxic powder.
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5908606 |
Method for producing hydrogen halide and oxygen
The present invention provides a process for producing hydrogen halide and oxygen by a stable chemical reaction for a long time. In this method, hydrogen halide and oxygen are produced by reacting...
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5895639 |
Separation of hydrogen fluoride from a fluorocarbon/hydrogen fluoride azeotropic mixture by sulfuric acid
The invention provides a process for the separation of azeotropic mixtures of fluorocarbons from hydrogen fluoride. The most preferred fluorocarbon for this invention is...
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5876685 |
Separation and purification of fluoride from industrial wastes
A method for the removal and purification of substantially all of the fluoride ions contained in a solution containing greater than 10 parts per million (ppm) fluoride ion, a mixture of other...
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5853690 |
Method for decomposing water using an activated carbon catalyst
Activated carbon is effective as a catalyst for water decomposition when it is coated with a heat-resistant, oxidation-resistant film. The heat-resistant, oxidation-resistant film is formed from an...
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