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| Number | Title | Issue Date |
| 4206189 | Method of producing hydrogen fluoride and silicon dioxide from silicon tetra-fluoride The method resides in that silicon tetrafluoride is subjected to water hydrolysis in the presence of sulphuric acid, the reactants being in an aerosol state. Hydrolysis is performed at a volume ratio of silicon tetrafluoride to sulphuric acid equal to 40:... | 06/03/1980 |
| 4202867 | Process for manufacture of phosphoric acid and phosphorus pentafluoride An improved method for treating calcium phosphate sources such as bone phosphate and phosphate rock with fluorosulfonic acid in the presence of a limited amount of moisture whereby over 98.00% of the phosphorous is converted to volatile compounds that can... | 05/13/1980 |
| 4199409 | Recovery of HF from an alkylation unit acid stream containing acid soluble oil A method and apparatus for recovering HF catalyst from an alkylation unit acid stream containing acid soluble oil wherein a bottoms stream, which contains HF, acid soluble oils and a minor quantity of water, from an HF rerun column are processed. The bott... | 04/22/1980 |
| 4198384 | Multistage incineration of halogenated hydrocarbon containing waste streams A method and apparatus for disposing of waste material by means of a multi-stage reaction favoring desired reaction products. The rate at which different reactions reach equilibrium at different temperatures and the effects of reaction stoichiometry are c... | 04/15/1980 |
| 4163045 | Process for producing hydrogen fluoride from an aqueous solution of hydrogen fluoride and sulfuric acid A process for producing hydrogen fluoride from an aqueous solution of hydrogen fluoride and sulfuric acid by distillation at an elevated temperature, in order to evaporate hydrogen fluoride of a desired concentration, in which the aqueous solution of hydr... | 07/31/1979 |
| 4157376 | Process for purification of gases A process for the removal of hydrogen fluoride and/or hydrogen chloride from gases comprising passing the gas to be purified through anion-exchange sorbent composed of a textured chemisorption fiber based on carbo-chain polymers with vinylpyridine groups ... | 06/05/1979 |
| 4154804 | Novel calcium chloride scrubbing bath In accordance with the process of the present invention, substantially complete removal of hydrogen fluoride values from a hydrogen chloride gas stream containing the same is effected by a process wherein the gas stream is contacted with an aqueous medium... | 05/15/1979 |
| 4144315 | Production of hydrogen fluoride Hydrogen Fluoride is manufactured from fluorosilicic acid. The fluorosilicic acid is reacted with ammonia to produce aqueous ammonium fluoride and solid silica. The ammonium fluoride is hydrolised in the presence of a mixture of ammonium fluoride and ammo... | 03/13/1979 |
| 4133868 | Isocyanates process III A process for producing isocyanates along with hydrogen fluoride and metal carboxylates by reacting a metal salt of an N-organic carbamic acid, RNHCO2 M, and an acyl fluoride.... | 01/09/1979 |
| 4120939 | Hydrogen fluoride process Anhydrous hydrogen fluoride is manufactured by dropping small particles of a metal fluoride, e.g., calcium fluoride, through a reaction zone countercurrent to a gas stream containing sulfur trioxide, sulfuric acid and water vapor.... | 10/17/1978 |
| 4102988 | Cyano compounds as fuels for HF or DF lasers A cyano compound fuel selected from the group consisting of dicyanoacetylene (DCA), tetracyanoethylene (TCE), and tetracyanoethylene oxide (TCEO) when reacted with an oxidizer compound selected from the group consisting of fluorine (F2), nitrog... | 07/25/1978 |
| 4101640 | Production of OH3+ salts Strong Lewis acids added to wet HF protonate the water to form stable OH3+ salts.... | 07/18/1978 |
| 4089936 | Production of hydrogen fluoride Ammonium fluoride is converted into a bifluoride by reaction with KF to form KF.HF, converting the latter to NaF.HF and heating said sodium bifluoride to form a solid product comprising NaF.... | 05/16/1978 |
| 4083941 | Purification of anhydrous hydrogen fluoride A process for preparing very high purity anhydrous hydrogen fluoride by contacting anhydrous hydrogen fluoride with at least 2.3% by weight of persulfuric acid based on the anhydrous hydrogen fluoride or at least 0.7% by weight of hydrogen peroxide based ... | 04/11/1978 |
| 4082839 | Preparation of sulfur fluorides A process, which may be continuous, for preparation of sulfur fluorides by reacting a sulfur chloride component with a fluorine containing component selected from the group consisting of nitrosyl fluoride and nitrosyl fluoride-hydrogen fluoride complex.... | 04/04/1978 |
| 4065551 | Method of recovering fluorine from carbonaceous waste material Particles of solid carbonaceous waste material which contain fluorine are suspended in a stream of gas consisting of a mixture of steam and air to establish a fluidized bed in a retort. The particles are heated to a temperature of not less than 1000° C t... | 12/27/1977 |
| 4062930 | Method of production of anhydrous hydrogen fluoride Anhydrous hydrogen fluoride is produced from fluorosilicic acid by its decomposition with sulphuric acid in an improved process. Fluorosilicic acid of high concentration 40-50%, free of suspended silica is decomposed while being heated up to its boiling t... | 12/13/1977 |
| 4062929 | Production of hydrogen fluoride Hydrogen fluoride is produced from hydrofluosilicic acid. The hydrofluosilicic acid is reacted with ammonia. An aqueous solution of ammonium fluoride thus produced is fed with partly recycled alkali metal fluoride to a continuously operated reactor where ... | 12/13/1977 |
| 4059680 | Method of preparing fumed SiO2 Fluorosilicic acid solutions, which normally undergo decomposition when distilled, thereby creating unwanted forms of SiO2, are rendered stable during distillation by providing in the fluorosilicic acid solution an amount of HF which is at leas... | 11/22/1977 |
| 4056604 | Production of hydrogen fluoride Hydrogen fluoride is recovered from hydrofluosilicic acid by-product of phosphoric acid manufacture. The hydrofluosilicic acid effluent is reacted with ammonia to form ammonium fluoride which is converted to a bifluoride by reaction with an excess of solu... | 11/01/1977 |
| 4036938 | Production of high purity hydrogen fluoride from silicon tetrafluoride Method and apparatus for the production of high purity hydrogen fluoride by the flame hydrolysis of silicon tetrafluoride and the deliberate cooling of the silicon dioxide and hydrogen fluoride reaction products without appreciable dilution to promote agg... | 07/19/1977 |
| 4032621 | Preparation of hydrogen fluoride with low levels of arsenic, iron and sulfite A process for preparing pure anhydrous hydrogen fluoride with decreased levels of arsenic, iron and sulfite by treating anhydrous hydrogen fluoride sequentially with an oxidizing agent, and then a heavy metal free reducing agent, distilling the resulting ... | 06/28/1977 |
| 4031191 | Process for producing hydrogen fluoride There is disclosed an improvement in the process of manufacturing HF wherein sulfur accumulates in HF process equipment. The improvement comprises adding to the process equipment sufficient SO3 to remove the sulfur and emptying the equipment.... | 06/21/1977 |
| 4008130 | Method for distilling a ternary azeotrope of fluorosilicic acid, hydrogen fluoride and water Fluorosilicic acid solutions, which normally undergo decomposition when distilled, thereby creating unwanted forms of SiO2, are rendered stable during distillation by providing in the fluorosilicic acid solution an amount of HF which is at leas... | 02/15/1977 |
| 3997652 | Selective chromatographic separation This invention comprises a method for the separation of one component or more from a vapor or gas mixture which involves the step of reacting the component to form a complex or thermally decomposible molecule by reaction with a compound adsorbed or otherw... | 12/14/1976 |
| 3991108 | Carboxylate fluorination process A process for the fluorination of carboxylate compounds to the corresponding acyl fluoride or carbamoyl fluoride, the latter compounds decompose to isocyanates and hydrogen fluoride, wherein the carboxylic acid, its anhydride or metal salt is intimately m... | 11/09/1976 |
| 3988424 | Method for decomposing an aromatic aldehyde-hydrogen fluoride-boron trifluoride complex A method for decomposing an aromatic aldehyde-hydrogen fluoride-boron trifluoride complex in the presence of a decomposing agent represented by the formula ##SPC1## Wherein n is integer of 1-6, inclusive, and m is integer of 0-5, inclusive, and a tot... | 10/26/1976 |
| 3976447 | Removal of hydrogen fluoride from gaseous mixture by absorption on alkaline earth metal fluoride A gaseous mixture containing up to 20% of hydrogen fluoride and other gases inert to alkaline earth metal fluorides is passed in contact with particulate anhydrous alkaline earth metal fluoride prepared by the fluorination of anhydrous alkaline earth meta... | 08/24/1976 |
| 3971845 | Recovery of hydrofluoric acid from aqueous fluosilicic acid Recovery of hydrofluoric acid from aqueous fluosilicic acid by treating said aqueous fluosilicic acid at a temperature of from 100° to 300°C. and under a pressure of from 3 to 80 atmospheres and separating resulting hydrogen fluoride containing aqueous ... | 07/27/1976 |
| 3961030 | Production of alumina from ores An aluminum-containing ore such as a kaolin or montmorillonite clay is treated with a fluorine acid such as HF or H2 SiF6 to produce aluminum fluoride (AlF3) which is recovered from the liquid phase of the reaction mixture... | 06/01/1976 |
| 3947558 | Method of recovering HF from mixtures containing C1 -C3 halocarbon compounds Hydrogen fluoride can be separated from an organic mixture of fluorinated C1 -C3 compounds and recovered for reuse by selectively absorbing the HF in a glycol in which the HF is soluble, but the fluorinated organic compound is substa... | 03/30/1976 |
