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| Number | Title | Issue Date |
| 7402547 | Systems and methods of producing a crude product Contact of a crude feed with one or more catalysts produces a total product that includes a crude product. The crude feed has a residue content of at least 0.2 grams of residue per gram of crude feed. Methods of preparing the one or more catalysts are described. The... | 07/22/2008 |
| 6921523 | Magnesium thiosulfate solution and process for preparing same An efficient process for the preparation of magnesium thiosulfate involves reaction of magnesium hydrosulfite and sulfur at elevated temperature. Magnesium hydrosulfite can be prepared from commercial magnesium oxide and sulfur. Sulfur dioxide can be used to maintai... | 07/26/2005 |
| 6862461 | Methods and apparatus for wireless operator notification in document processing systems Techniques for operator notification of exceptions affecting financial document transaction processing machines are described. A transaction processing machine affected by an exception notifies the operator by sending a wireless message by means of a low cost, weara... | 03/01/2005 |
| 5770172 | Process of forming compounds using reverse micelle or reverse microemulsion systems The present invention is directed to a process for producing a nanometer-sized metal compound. The process comprises forming a reverse micelle or reverse microemulsion system comprising a polar fluid in a non-polar or low-polarity fluid. A first reactant ... | 06/23/1998 |
| 5399323 | Method for improving reducing potential of natural gas feed A means to increase the reducing potential of natural gas used in the reduction of sulfates such as gypsum. A reducing mixture of natural gas and air (or oxygen) is heated prior to reduction of the sulfate. For gypsum reduction, heating the reducing mixtu... | 03/21/1995 |
| 5066470 | Cyclic process for the removal of sulfur dioxide and the recovery of sulfur from gases In accordance with the invention, gases containing sulfur dioxide are passed through a solution rich in ferric iron and containing barium chloride or calcium chloride. Sulfur dioxide is oxidized by the ferric ion to sulfur trioxide when then forms sulfuri... | 11/19/1991 |
| 4943411 | Process for treating molten iron with magnesium additions A process for treating molten cast iron with pure magnesium wherein a granular mixture of magnesium granules admixed with granules of refractory material is flooded with molten iron. By employing granular refractory material of controlled size in the gran... | 07/24/1990 |
| 4795625 | Method of manufacturing barium sulphide The invention relates to a method of manufacturing barium sulphide from barites or barium sulphate. The method of manufacturing barium sulphide as per this present invention involves using finely divided calcium carbide for the reduction at a temperature ... | 01/03/1989 |
| 4738207 | Non-polluting method of burning fuel for heat and CO2 A non-polluting method of, and apparatus for, burning fuel to produce heat and a CO2 -rich hot flue gas stream is described. Fuel (e.g., coal, oil, gas, wood, inter alia) is passed into a gasifier bed (12) containing particles of calcium sulfat... | 04/19/1988 |
| 4704136 | Sulfate reduction process useful in coal gasification A carbonaceous material, such as coal, is gasified through the catalytic action of an alkali metal salt. The alkali metal is provided as a sulfate which is converted to a sulfide during gasification. In one embodiment, sodium sulfate is converted to sodiu... | 11/03/1987 |
| 4547347 | Granulometric control of nickel sulfide precipitate A process wherein nickel in an aqueous stream is recovered as nickel sulfide by precipitation in an autoclave with pressurized hydrogen sulfide in the presence of a large quantity of recycled fine nickel sulfide seed material is improved when operated und... | 10/15/1985 |
| 4444736 | Process for removing SO2 and NOx from gases A process for removing SO2 and NOx from waste gas and recovering sulfur comprising scrubbing the waste gases with a water slurry of FeS in the presence of FeSO4 and Na2 SO4. SO2 is captured by ... | 04/24/1984 |
| 4405570 | Removal of dissolved cadmium and copper from sulphate solution with hydrogen sulfide A process for selectively removing ions of copper and/or cadmium from a sulphate solution containing nickel and/or cobalt values. The solution is treated at a temperature in the range of from about 85° to about 95° C. and at a pH in the range of from ab... | 09/20/1983 |
| 4396594 | Sulfur dioxide reduction process Sulfur dioxide is converted to elemental surfur by reduction with a carbonaceous material in a reaction zone containing a molten salt. Heat is provided by reacting a portion of the carbonaceous material with oxygen. In a preferred embodiment alkali metal ... | 08/02/1983 |
| 4325811 | Catalytic cracking with reduced emission of noxious gas A process for the control of sulfur oxide emissions from the regenerator of a fluid catalytic cracking unit which involves circulating solid particles through the process cycle which comprise cracking catalyst and a regenerable sulfur oxide absorbent, abs... | 04/20/1982 |
| 4324776 | Mid-temperature H2 S removal process H2 S is removed from a stream of gas such as coal gas at a relatively elevated temperature (300°-400° F.) in a process which employs sulfates or hydroxides of nickel, iron, or zinc as sulfur absorbents. The absorbents are converted to metal s... | 04/13/1982 |
| 4322266 | Process for catalyzing reduction in a Kraft recovery boiler A Kraft pulping process by which spent pulping liquor is burned in a recovery furnace 12 to reduce inactive alkali sulfates therein to active alkali sulfides while producing molten smelt that when added to water forms green liquor and residual dregs beari... | 03/30/1982 |
| 4316947 | Cadmium sulfide for electrophotography Cadium sulfide for electrophotography is produced by reacting hydrogen sulfide with a solution containing cadmium sulfate, sulfuric acid and hydrochloric acid of a low concentration, and then firing the resulting cadmium sulfide without adding a donor imp... | 02/23/1982 |
| 4309398 | Conversion of alkali metal sulfate to the carbonate A process for converting potassium sulfate to potassium carbonate in which a mixture of potassium sulfate and calcium oxide are reacted at a temperature in the range of between about 700° C. and about 800° C. with a gaseous mixture having a minor amount... | 01/05/1982 |
| 4303623 | Separation of trace molybdenum from tungstate solutions Dissolved molybdenum is removed from sodium tungstate solutions by adding sulfuric acid to lower the pH value of the solution to between about 8 and about 5, adding to the sodium tungstate solution a water-soluble sulfide in an amount of at least 0.5 gram... | 12/01/1981 |
| 4298584 | Removing carbon oxysulfide from gas streams Process for removing carbon oxysulfide from a gas stream including contacting the gas stream with a scrubbing solution containing copper sulfate buffered to an acidic pH and removing at least some of the copper sulfides produced.... | 11/03/1981 |
| 4272397 | Method of preparing flake-like ceramic particle of zinc sulfide phosphor Flake-like ceramic particles of zinc sulfide phosphor and method of preparing the same including the steps of preparing flake-like particles of basic zinc sulfate crystal doped with activator, sulfurizing in the particles carbon disulfide, and heating the... | 06/09/1981 |
| 4260590 | Recovery of salts of anthraquinone disulfonic acid in the Stretford process In the Stretford process wherein hydrogen sulfide, obtained for example, in the catalytic conversion of sulfur compounds, is absorbed into an alkaline solution of the sodium salt of anthraquinone disulfonic acid (ADA) and sodium vanadate and eventually co... | 04/07/1981 |
| 4243645 | All dry solid potassium seed regeneration system for magnetohydrodynamic power generation plant In a magnetohydrodynamic power plant where calcium carbonate seed is used to increase conductivity and scavenge sulfur, forming potassium sulfate, an improved process is disclosed for converting the potassium sulfate back into potassium carbonate for reus... | 01/06/1981 |
| 4202864 | Process for controlling environmental pollution from steam containing hydrogen sulfide Certain impure steams, especially those from geothermal sources, are polluted with hydrogen sulfide, ammonia, carbon dioxide, other gases, and finely divided particulate solid matter in a form resembling dust or smoke. These contaminants reduce the effici... | 05/13/1980 |
| 4198385 | Reduction of sodium sulfate to sodium sulfide Methods and apparatus pertaining to reduction of sodium sulfate to sodium sulfide include the feeding of sodium sulfate into a combustion chamber in which the sodium sulfate is exposed to a reducing atmosphere while at the same time being exposed also to ... | 04/15/1980 |
| 4197122 | Process for preparing raw particles of cadmium sulfide for electrophotography A process for preparing raw particles of cadmium sulfide for electrophotography comprises reacting a solution containing cadmium ion and hydrochloric acid with hydorgen sulfide to make cadmium sulfide particles deposited from the solution.... | 04/08/1980 |
| 4192854 | Process for removing hydrogen sulfide and ammonia from gaseous streams A process is described for the simultaneous removal of H2 S and ammonia from gaseous streams containing other acid and basic gases. The process comprises closed loop scrubbing of the gaseous stream with a copper sulfate-ammonium sulfate solutio... | 03/11/1980 |
| 4177067 | Recovery of silver, copper and zinc from partially roasted pyrite concentrate by ferric sulphate leaching A process for treating a pyrite concentrate containing silver, copper and zinc to recover the metals contained therein is disclosed. The process includes the partial roasting of the concentrate to open the pyrite matrix to solution penetration followed by... | 12/04/1979 |
| 4123506 | Utilization of impure steam contaminated with hydrogen sulfide Certain impure streams, especially those from geothermal sources, are polluted with hydrogen sulfide, ammonia, carbon dioxide, other gases, and finely divided particulate solid matter in a form resembling dust or smoke. These contaminants reduce the effic... | 10/31/1978 |
| 4110400 | Selective precipitation of nickel and cobalt sulfides from acidic sulfate solution A method for efficiently precipitating nickel sulfide from an acidic nickel sulfate solution having a pH between 1.5 and 4, containing about 1 to 40 gpl nickel, optionally containing cobalt, and containing sufficient inert soluble sulfate salt to buffer t... | 08/29/1978 |
| 4101452 | Lead sulfide activation process 1. The process of photosensitizing lead sulfide comprising adding a persulfate solution to intermixed solutions of thiourea, lead acetate and sodium hydroxide whereby activated lead sulfide is precipitated therefrom.... | 07/18/1978 |
| 4070445 | Reduction of aqueous thiosulfate solutions Sodium, potassium and ammonium thiosulfates may be converted to a mixture of the corresponding carbonates and sulfides by first partially reducing the thiosulfate with CO to formate in a first reduction zone, and then using the formate so produced to effe... | 01/24/1978 |
| 4039649 | Process for removing sulfur from waste waters containing sulfuric acid Process for recovering sulfur from waste waters containing sulfuric acid, comprising reacting in a first step, the waste water with an aqueous solution of ammonium sulfite, separating the formed sulfur dioxide from the solution, reacting the resulting sol... | 08/02/1977 |
| 4021237 | Process for producing cadmium sulfide for electrophotography CdS for electrophotography is produced by contacting sulfide ion, cadmium ion and a donor impurity of Group IIIa or IIIb of the Periodic Table and firing the resulting CdS. An acceptor impurity may be added to the first step or the second step.... | 05/03/1977 |
| 3944685 | Preparation of heat barrier materials Heat barrier materials are prepared by forming an intimate admixture of alkaline earth sulfate and finely divided carbonaceous material into a shaped composition and subjecting said shaped composition to a high temperature to cause a surface reaction to p... | 03/16/1976 |
| 3941875 | Process for treating gas containing hydrogen sulfide A process for treating a hydrogen sulfide-containing gas in a closed loop system wherein said gas is passed through and absorbed by an alkaline aqueous absorbent containing an alkali carbonate and an oxidation catalyst. The solution containing the dissolv... | 03/02/1976 |
