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| Number | Title | Issue Date |
| 7335268 | Inorganic compound for removing polymers in semiconductor processes An inorganic compound for removing polymers after a semiconductor etching process and related methods and apparatus are disclosed. An example compound includes DIW, H2SO4, H2O2 and HF. An example method for removing polyme... | 02/26/2008 |
| 7288201 | Methods for removing moisture from hydrogen halides A composition comprising a magnesium halide coated macroporous carbonaceous substrate is provided for effecting moisture removal from a hydrogen halide fluid. Moisture removal is effected by intimately contacting the hydrogen halide fluid with the magnesium halide c... | 10/30/2007 |
| 7276284 | Carbon fiber reinforced coke from the delayed coker A number of properties of polygranular carbon bodies can be improved by small quantities of carbon fibers being incorporated in the formulations for production of such bodies. However, it has proven difficult for carbon fibers to be introduced into the green mixture... | 10/02/2007 |
| 7108737 | Method for the purification of corrosive gases The present invention relates to a novel process for the preparation of high-purity chemicals with an extremely low particle count, such as ammonia gas, hydrogen fluoride and hydrogen chloride, which are also used as aqueous solutions in semiconductor technology the... | 09/19/2006 |
| 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 salt into a reactor through a nozzle while circulating the fused amm... | 08/01/2006 |
| 7070751 | Production of gaseous chloramine The present invention provides a reactor for the gas-phase reaction of commercially available gases in the presence of an inert carrier gas to form product gas. The reactor has a streamlined, compact configuration and at least one solids collection and removal syste... | 07/04/2006 |
| 7033562 | Ammonia recovery in the preparation of silazanes and polysilazanes Silazanes and/or polysilazanes are prepared by ammonolysis reaction in liquid anhydrous ammonia by introducing at least one halosilane into the ammonia. In addition to the silazane and/or polysilazane, an ammonolysis by-product also results. A substantially more eff... | 04/25/2006 |
| 7018598 | Process for producing nitrogen trifluoride F2 gas is reacted with NH3 gas in a gaseous phase at 80° C. or less in the presence of a diluting gas to produce NF3. Thus, NF3 is produced with good safety, efficiency and profitability. ... | 03/28/2006 |
| 6540939 | Templated compositions of inorganic liquids and glasses An inorganic liquid or glass of hybrid composition including an inorganic component; and a template component, wherein the inorganic component and the template component are present in composition in a ratio that provides an intermediate range structural ... | 04/01/2003 |
| 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 into ultra-pure hydrofluoric acid. The inventive method and... | 02/26/2002 |
| 6117406 | Process for manufacturing ammonium salts A process for manufacturing ammonium salts using a reactor which includes a first tubular reaction chamber having at least one acid feed and at least on ammonia feed which are arranged in a first up-stream part of the reactor. At least one second ammonia ... | 09/12/2000 |
| 5958353 | Method for reducing atmospheric pollution The invention provides a method for reducing atmospheric pollution caused by a pollutant selected from the group consisting of CO2, SO2 and a mixture thereof, the pollutant being contained in industrial gases being emitted to the atm... | 09/28/1999 |
| 5944868 | Production of liquid fertilizers by ion exchange Ion exchange is used to make two grades of liquid fertilizer. In the first phase, ammonium thiosulfate (ATS) is contacted with a potassium-containing ion exchange resin to make the liquid fertilizer potassium thiosulfate (KTS) and an ammonium-containing r... | 08/31/1999 |
| 5885542 | Halo-zeo-type materials Disclosed herein is a novel class of halide-based framework solids based on a Znn Cl2n parentage, as zeo-types are related to Sin O2n. These materials, referred to as halo zeo-type materials, constructed from Le... | 03/23/1999 |
| 5763652 | Process for producing a carboxylic acid A nitrile compound or an amide compound is hydrolyzed in the presence of an inorganic acid or other acidic catalyst or an alkali metal hydroxide or other basic catalyst, and the by-produced ammonium salt of the acidic catalyst or the produced salt of a ca... | 06/09/1998 |
| 5679315 | Method of production of high purity silica The present invention provides a basic method for producing high purity silica and ammonium fluoride from silicon tetrafluoride-containing gas, particularly the gas generated by acidulation. The basic method comprises recovering silicon tetrafluoride-cont... | 10/21/1997 |
| 5290531 | Method of making ammonium bromide and calcium bromide A method of converting sodium bromide brine to ammonium bromide brine and optionally to calcium bromide is disclosed. The method involves introducing ammonia and carbon dioxide into the reactant brine, removing a resulting bicarbonate precipitate, driving... | 03/01/1994 |
| 5165907 | Method of production of high purity silica and ammonium fluoride A method for producing high purity silica and ammonium fluoride from silicon tetrafluoride-containing gas wherein silicon tetrafluoride-containing gas from the acidulation of phosphorus-containing rock is recovered and the liquid entrainment is separated ... | 11/24/1992 |
| 4981664 | Method of production of high purity silica and ammonium fluoride A method for producing high purity silica and ammonium fluoride from silicon tetrafluoride-containing gas wherein silicon tetrafluoride-containing gas from the acidulation of phosphorus-containing rock is recovered and the liquid entrainment is separated ... | 01/01/1991 |
| 4965061 | Process for removing fluoride from a wastewater and producing hydrofluoric acid therefrom A process for producing hydrofluoric acid from SiF62- in a wastewater is disclosed. The process is carried out by (i) combining (NH4)2 SO4, at a pH high enough such that the sulfate is in its divalent sta... | 10/23/1990 |
| 4935219 | Process for obtaining ferric oxide and ammonium salts The process of the invention is carried out in gaseous phase by the action of ammonia on the aqueous solutions of iron salts in an appropriate reacting vessels.... | 06/19/1990 |
| 4919906 | Processes and equipment for production of elemental phosphorus and thermal phosphoric acid New processes and equipment are disclosed for producing elemental phosphorus and thermal phosphoric acid. Benefits are listed below. 1. Phosphorus-containing solids are recycled to smelting furnaces thus eliminating hazardous waste generation. 2. Phosphorus fu... | 04/24/1990 |
| 4915705 | Production of silica and fluorine-containing coproducts from fluosilicic acid A process for producing high grade silica and fluorine-containing coproducts from fluosilicic acid is described. To produce silica, the fluosilicic acid is reacted with aqueous ammonia to produce a solid silica product and a solution of ammonium fluoride.... | 04/10/1990 |
| 4859443 | Preparation of silicon nitride powder Silicon nitride powder is prepared in a gas-phase reaction by reacting silicon tetrachloride with ammonia at above 500° C. in a fluidized bed of silicon nitride particles. An amorphous silicon nitride having a BET specific surface area of greater than 50... | 08/22/1989 |
| 4741893 | Process for producing fluorides of metals Process for producing fluorides of Mo, W, Nb, Ta, V, Re, Ti, Zr, Hf, Co, Ni, Cr, Sb, Sn, Zn, Pb, Al and rare earth metals comprising heating fluorine-containing ammonium salts of corresponding metals in a stream of an inert or reducing gas to convert them... | 05/03/1988 |
| 4720375 | Process for producing magnesium oxide High purity magnesium oxide is obtained from a magnesite-containing ore, the impurities of which include calcium compounds. The ore is first calcined and the resulting magnesium oxide is converted to magnesium chloride by leaching with an ammonium chlorid... | 01/19/1988 |
| 4613494 | Recovery of fluorine from waste gases Fluorine in phosphate ores is present as the mineral fluorapatite. When the ores are digested with sulfuric acid a slurry is formed which can be filtered to make wet-process phosphoric acid. But fluorine compounds are discharged into the surrounding air d... | 09/23/1986 |
| 4536322 | Fluorescent corrosive fluoride solution A composition of matter including an aqueous solution of hydrofluoric acid or ammonium fluoride and a dye that fluoresces when illuminated by ultra-violet light. Spilled corrosive fluoride solutions are thereby rendered easily detectable by subjecting the... | 08/20/1985 |
| 4508690 | Method of producing very pure magnesium oxide Very pure magnesium oxide is obtained from ore containing magnesium, more particularly ore containing magnesium carbonate, by calcining the ore and leaching the resulting magnesium oxide with carbon dioxide and calcium chloride solution to produce magnesi... | 04/02/1985 |
| 4490345 | Conversion of FS smoke agent (a mixture of sulfur trioxide and chlorosulfonic acid) to sulfamic acid and ammonium chloride The process of converting FS smoke agent (a mixture of sulfur trioxide and hlorosulfonic acid) to sulfamic acid and ammonium chloride comprising the steps of dissolving the FS smoke agent in an organic solvent solution to obtain a solvation product, subjec... | 12/25/1984 |
| 4419334 | Process for cooling and separating chlorides and fluorides from gas mixtures A method for the cooling and separation of chlorides and fluorides from hot mixtures of gases generated by the gasification of solid or liquid fuels or by extracting gas from solid fuels by cooling the gas mixture in the presence of a circulating liquid o... | 12/06/1983 |
| 4385192 | Process for manufacturing DBCP A process for manufacturing 1,2-dibromo-3-chloropropane is disclosed. The process comprises the steps of reacting bromine and allyl chloride at a temperature of from 5° to 85° C. and maintaining the reaction mixture between 60° to 90° C. for a suffici... | 05/24/1983 |
| 4160811 | Production of tetrafluorammonium bifluoride and tetrafluorammonium tetrafluoroborate The compound NF4 MF6 where M is a Group V metalloid is reacted with a fluoride of sodium to yield tetrafluorammonium bifluoride in solution with hydrogen fluoride and a precipitate of the formula NaMF6. The preferred metal... | 07/10/1979 |
| 4138296 | Method for removing nitrogen trichloride from chlorine gas In a process for making chlorine electrolytically in which a build-up of nitrogen trichloride occurs in the bottoms of cooling apparatus, a method and apparatus is provided wherein the nitrogen trichloride is dissolved in an organic solvent such as carbon... | 02/06/1979 |
| 4117089 | Process for preparing sodium ammonium hydrogen-phosphate and ammonium chloride from wet process phosphoric acid Highly pure sodium ammonium hydrogenphosphate and ammonium chloride are prepared from wet process phosphoric acid. A mixture of phosphoric acid, ammonia and/or sodium chloride is added to a circulating mother liquor, to which is additionally added ammonia... | 09/26/1978 |
| 4104190 | Generation of chlorine dioxide for disinfection and sterilization Chlorine dioxide is generated from aqueous liquids container alkali metal or alkaline earth metal chlorites, and compounds which liberate chlorine in water. Dry, stable, solid compositions, in one or two parts, can be made from these and other ingredients... | 08/01/1978 |
| 4079121 | Complexes of beta platinum chloride and ammonia This invention relates to reactions of beta platinum chloride with gaseous ammonia to yield metallic platinum useful in catalysis and other operations and also complexes of beta platinum chloride and ammonia, which complexes are considered to be new compo... | 03/14/1978 |
| 4075307 | Reaction of beta platinum chloride with gaseous ammonia This invention relates to reactions of beta platinum chloride with gaseous ammonia to yield metallic platinum useful in catalysis and other operations and also complexes of beta platinum chloride and ammonia, which complexes are considered to be new compo... | 02/21/1978 |
| 4069299 | Hydroxy-aluminum chloride and sulfate polymer production Hydroxy-aluminum chloride or sulfate polymer is produced by reacting urea and aluminum chloride or aluminum sulfate in aqueous solution. The hydroxy-aluminum chloride and sulfate polymers are useful for consolidating soil in secondary oil recovery and for... | 01/17/1978 |
| 4064218 | Removal of phosgene from off-gases Process for the removal of phosgene from an off-gas in which it is present in small quantities, by washing with an aqueous solution of alkali and ammonia.... | 12/20/1977 |
