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| Number | Title | Issue Date |
| 4288421 | Process of treating exhaust gas containing nitrogen oxides and sulfur dioxide A process of treating an exhaust gas containing NOx and SO2 comprising bringing the gas into contact with an absorbing solution containing iron chelate salt and potassium sulfite, cooling the solution to crystallize and separate abso... | 09/08/1981 |
| 4271137 | Fixation of nitrogen A process for the fixation of nitrogen comprising, combining a gaseous nitrogen and oxygen at a total temperature of about 100 atmospheres with a solid oxide which can produce a nitrate, in the presence of a catalyst for the acceleration of a reaction bet... | 06/02/1981 |
| 4247321 | Method and apparatus for obtaining fertilizing solution from fossil fueled stationary engines A method and apparatus for obtaining fertilizing solution from fossil fueled stationary engines by adding carbon dioxide and nitrogenous compounds, derived from exhaust gases, and ozone gas derived from a generator, to water so as to produce a fertilizing... | 01/27/1981 |
| 4246019 | Method of producing a complex mineral fertilizer A method of producing a complex mineral fertilizer is disclosed, comprising the steps of decomposing polyhalite at a temperature not exceeding 110° C. in the presence of dilute nitric acid, neutralizing the obtained suspension with a substance selected f... | 01/20/1981 |
| 4236981 | Hydrometallurgical process for treating nickel mattes This invention provides a process for treating a nickel matte to recover essentially pure nickel comprising: treating an aqueous mixture of the matte with chlorine to produce a solid residue and an aqueous lixiviating solution having a pH value which is s... | 12/02/1980 |
| 4231997 | Preparation of rare earth nitrates A process for preparing a rare earth nitrate solution in which rare earth hydroxides containing quadrivalent cerium are dissolved in nitric acid with the addition of hydrogen peroxide. The change in oxidation-reduction E.M.F. may be used to control the ad... | 11/04/1980 |
| 4216191 | Method of preparing inorganic-alkali metal salts The present invention is directed to a method of preparing an inorganic-alkali metal salt of the formula: wherein Z is an alkali metal selected from the group consisting of lithium and sodium, and wherein Y is an inorganic radical selected from the group ... | 08/05/1980 |
| 4192814 | Process for catalytic conversion of thallium (I) to thallium (III) A monovalent thallium compound is converted to a trivalent thallium compound by treating the thallium (I) compound with molecular oxygen in the presence of a Group VIII noble metal catalyst in a liquid medium and in the presence of a promoter comprising a... | 03/11/1980 |
| 4164545 | Use of manganese dioxide absorbent in treating waste gases A system for treating waste gas in which the waste gas is contacted with an absorbent which contains manganese dioxide; thereafter contacting the absorbent with water to solubilize salts of manganese with an acidic ion exchange resin that retains manganes... | 08/14/1979 |
| 4159309 | Process for the catalytic reduction of reducible compounds in solution Reducible pollutants can be detoxified by reduction and metals can be recred by reduction of the corresponding metal ions by bringing into contact a catalyst with the solution which is suitable for the electrochemical reduction of the ions in question, a... | 06/26/1979 |
| 4145399 | Process for the removal of nitrogen oxide A process for removing nitrogen oxides (NOx) from a waste gas containing 300 through 20,000 ppm of NOx is disclosed. In the process, the waste gas containing NOx is adjusted to a molar ratio of NO/NO2 of approxi... | 03/20/1979 |
| 4136157 | Method of preparing purified silver nitrate A method of preparing silver nitrate of an improved purity comprising adding about 50 to about 1000 ppm of Al3+ ion to a crude silver nitrate solution resulting from dissolving metallic silver in nitric acid, adjusting the pH of the silver nitr... | 01/23/1979 |
| 4115420 | Catalytic conversion of thallium (I) to thallium (III) A monovalent thallium compound is converted to a trivalent thallium compound by treating the thallium (I) compound with molecular oxygen in the presence of a Group VIII noble metal catalyst to oxidize the thallium (I) compound to a thallium (III) compound... | 09/19/1978 |
| 4115421 | Process for converting thallium (I) to thallium (III) A monovalent thallium compound is converted to a trivalent thallium compound by treating the thallium (I) compound with an organic hydroperoxide in the presence of a Group VIII noble metal catalyst in a liquid medium to oxidize the thallium (I) compound t... | 09/19/1978 |
| 4115419 | Process for converting thallium (I) to thallium (III) A monovalent thallium compound is converted to a trivalent thallium compound by treating the thallium (I) compound with an organic hydroperoxide in the presence of a Group VIII noble metal catalyst in a liquid medium and in the presence of a promoter comp... | 09/19/1978 |
| 4113756 | Conversion of mono-valent thallium to tri-valent thallium A mono-valent thallium compound is converted to a trivalent thallium compound by treating the thallium (I) compound with molecular oxygen in the presence of a Group VIII noble metal catalyst and in the presence of a promoter comprising an alkali metal com... | 09/12/1978 |
| 4094643 | Ammonium nitrate neutralizer A thermal syphon-pressure pump neutralizer for neutralizing nitric acid with ammonia, comprising a reaction vessel for containing an aqueous reaction medium and having a gas outlet in its upper end and a product outlet spaced therebelow, a fluid imperviou... | 06/13/1978 |
| 4094958 | Process for the separation of NH3 from a gaseous mixture containing NH3 and HCN A process for the separation of ammonia from a gaseous mixture containing ammonia and hydrogen cyanide which comprises contacting said gaseous mixture in an absorption stage with an absorbent liquor comprising an acidified ammonium nitrate solution thereb... | 06/13/1978 |
| 4061743 | Exhaust gas scrubbing process Nitrogen oxides, or both sulfur oxides and nitrogen oxides are efficiently and economically removed from exhaust gas containing the same with an aqueous scrubbing suspension of alkaline earth metal compounds. The aqueous scrubbing suspension of alkaline e... | 12/06/1977 |
| 4053572 | Process for preparing essentially pure barium fluoride crystals A malleable or press-forgeable ingot of barium fluoride, for use as an optical body, may be grown from an ultra-pure precipitate of barium fluoride which contains less than 10 parts per million (ppm) of strontium or calcium. A process is disclosed for cry... | 10/11/1977 |
| 4048291 | Process for preparing hydroxylammonium salts A process for making hydroxyl ammonium salts by hydrogenation of nitric oxide in an acid medium in the presence of a platinum catalyst, wherein the catalyst contains 15 to 50 atom percent of selenium and the acid medium is at least 2N during the reaction.... | 09/13/1977 |
| 4032613 | Removal of iron from aluminum nitrate Iron is removed from concentrated aluminum nitrate solution by solvent extraction with tri-n-butyl phosphate.... | 06/28/1977 |
| 4008309 | Process for crystallizing calcium nitrate Large-sized calcium nitrate tetrahydrate particles are obtained by dissolving phosphate rock in concentrated nitric acid, cooling the resulting solution, intentionally terminating the crystallization of the calcium nitrate tetrahydrate when only 40 to at ... | 02/15/1977 |
| 3997331 | Metallized salts A process and apparatus for producing certain metal salts in very fine particulate form. The process comprises cooling a solution of metal salt until the solution freezes and thereafter evaporating the solvent under very low pressure. The process is parti... | 12/14/1976 |
| 3982930 | Method for disposal of tracer bullets A method for disposing of tracer bullets having in a steel bullet a pyrotnic material containing strontium nitrate, magnesium, strontium peroxide, polyvinyl chloride, calcium resinate, barium peroxide, oxamide, zinc stearate, polyethylene, strontium oxal... | 09/28/1976 |
| 3983221 | Production of basic aluminium nitrate solution A process for the production of basic aluminum nitrate solutions by reacting metallic aluminum with nitric acid, comprising establishing a body of metallic aluminum, supplying additional aluminum to said body, supplying to said body countercurrent to the ... | 09/28/1976 |
| 3983222 | Removing nitrates with an organic amine salt and ion exchange A continuous process for removing nitrates from nitrate containing aqueous solutions having a pH of about 0-7, which comprises: (1) extracting the nitrate containing aqueous solution with an organic amine salt dissolved in an organic solvent phase whereby... | 09/28/1976 |
| 3975498 | Process for adsorbing and removing nitrogen oxides from waste gases A process for adsorbing and removing nitrogen oxides from waste gases is disclosed, wherein nitrogen oxides are adsorbed in a layer packed with electrolytic manganese dioxide blocks and eluted with water or aqueous alkaline solution. The specific action o... | 08/17/1976 |
| 3964957 | Apparatus for processing semiconductor wafers Circular wafers of semiconductor (silicon) are chemically treated, e.g., etched, by supporting the wafers vertically by contacting their edges with annularly grooved drive rollers, immersing the supported wafers in a body of chemical medium (e.g., etchant... | 06/22/1976 |
| 3957947 | Process for continuous production of aqueous basic aluminum salt solutions An aqueous basic aluminum salt high in basicity can be continuously produced with a high conversion by passing a slurry of aluminum hydroxide, alumina-containing mineral or a mixture thereof and hydrochloric or nitric acid through a tubular reactor and th... | 05/18/1976 |
| 3947553 | Process for preparing pure barium nitrate crystals A malleable or press-forgeable ingot of barium fluoride, for use as an optical body, may be grown from an ultra-pure precipitate of barium fluoride which contains less than 10 parts per million (ppm) of strontium or calcium. A process is disclosed for cry... | 03/30/1976 |
| 3930844 | Method for disposal of pyrotechnic waste A method for disposing of tracer ammunition pyrotechnic material containing trontium nitrate, magnesium, strontium peroxide, polyvinyl chloride, calcium resinate, barium peroxide, oxamide, zinc stearate, polyethylene, strontium oxalate and lead dioxide, wi... | 01/06/1976 |
