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| Number | Title | Issue Date |
| 4314982 | Catalytic decomposition of H2 SO4 A two-stage process for the catalytic decomposition of H2 SO4 wherein H2 SO4 in vapor form is contacted in a first stage with a platinum group metal catalyst at temperatures between about 700° K. and 970° K. T... | 02/09/1982 |
| 4283372 | Recovery of alkali values from sodium bicarbonate-containing ore with ammonia A method for recovering alkali value from sodium bicarbonate-containing ore by utilizing an aqueous solvent containing ammonia. The aqueous ammonia solvent is contacted with the ore to solubilize the sodium bicarbonate-containing ore. The alkali values in... | 08/11/1981 |
| 4283377 | Process for the preparation of basic zirconium carbonate of high purity A method for preparing a high purity basic zirconium carbonate comprising (a) adding alkali or ammonium carbonate or alkali or ammonium hydrogen carbonate to an aqueous solution of zirconium sulfate to precipitate basic zirconium sulfate; (b) dissolving the ba... | 08/11/1981 |
| 4283270 | Process for removing sulfur from petroleum oils The present invention is directed to a process for desulfurizing petroleum oils and for improving the performance of known catalytic hydrodesulfurization processes. In accordance with the process, a narrow boiling fraction of a typical hydrodesulfurizatio... | 08/11/1981 |
| 4272498 | Process for comminuting and activating limestone by reaction with CO2 The present invention relates to a non-mechanical method of converting coarsely ground limestone to a very fine powder. A slurry of ground calcium carbonate or limestone is contacted with carbon dioxide gas at high pressure to convert the solids in the sl... | 06/09/1981 |
| 4267162 | Process and apparatus for the exploitation of the sulfur compounds contained in gases containing oxygen and a high water vapor content Sulfur compounds contained in gases containing oxygen and a high content of water vapor are exploited by removing the water vapor content by treating the gases with a glycol and then using the dried gas still containing sulfur compounds, as an oxidation g... | 05/12/1981 |
| 4265871 | Purification of boron-containing sulfuric acid Sulfuric acid contaminated with boron and fluoride values such as the waste acid of a boron trifluoride process is purified by contacting the contaminated acid with an inert gas to desorb boron trifluoride, and the inert gas is stripped by contacting with... | 05/05/1981 |
| 4264570 | Method of producing magnesium sulphate A method of producing magnesium sulphate comprises the steps of interacting ferrous sulphate with compounds including magnesium carbonates, oxides and hydroxides, with magnesium sulphate being produced. The step of interacting the starting reagents is con... | 04/28/1981 |
| 4261965 | Basic zinc compound flake-like crystalline particle and method for preparation thereof Basic zinc compound flake-like crystalline material suited for use in crystal-oriented electronic devices and method for preparation thereof comprising the steps of preparing a solution including at least zinc ions and sulfate ions, and causing precipitat... | 04/14/1981 |
| 4259310 | Process for the manufacture of titanium disulfide A process for the manufacture of titanium disulfide by the vapor phase reaction of titanium tetrachloride and a sulfur containing gas. The titanium tetrachloride and the sulfur containing gas are preheated separately and the sulfur containing gas is intro... | 03/31/1981 |
| 4256719 | Process for the combined manufacture of chlorinated hydrocarbons and sodium bicarbonate Production of sodium bicarbonate by the Solvay-soda method, employing a volatile aliphatic amine instead of ammonia, is combined with the oxychlorination of olefins in liquid phase by using the amine hydrochloride side-product of the soda plant as chlorin... | 03/17/1981 |
| 4256721 | Combustion method and apparatus In a process for thermally cracking waste sulphuric acid, a combustible material is mixed with such acid and the mixture is supplied to a burner to which a flow of atomizing air is also supplied. A flow of secondary air which is enriched to about 23-40% b... | 03/17/1981 |
| 4256718 | Sodium zirconium carbonate compound and the method of its preparation There is disclosed a sodium zirconium carbonate compound and the method of its preparation. The sodium zirconium carbonate compound is formed from a metastable aqueous solution comprising zirconium, sodium, sulfate, and carbonate ions.... | 03/17/1981 |
| 4255398 | Novel ettringite whiskers, production and uses This disclosure deals with ettringite whiskers, methods of synthesizing such whiskers and ettringite whisker composites. The ettringite whiskers, having a new crystal form, are 1-2 μm in diameter, 50-100 μm in length and approximately 30-50 of aspect ra... | 03/10/1981 |
| 4254093 | Solar energy grade cadmium sulfide A composition consisting essentially of discrete particles of cadmium sulfide that are relatively free of anionic, cationic and volatile impurities has an average particle size of from about 8 to about 25 micrometers and a bulk density of from about 1.7 t... | 03/03/1981 |
| 4252780 | Process for working up hydrolyzable and/or water-soluble compounds A process for working up hydrolyzable and/or water-soluble compounds by ping them in water is provided wherein the compounds are fed into the funnel of a rotating cone of water running down into the tip of the cone, with the water being constantly renewe... | 02/24/1981 |
| 4252781 | Preparation of sodium carbonate anhydride A thick suspension of sodium carbonate anhydride is obtained by countercurrent contacting of a high pressure steam and a suspension of sodium bicarbonate or sodium sesquicarbonate in a concentrated solution of sodium carbonate. The decomposition reaction ... | 02/24/1981 |
| 4251282 | Method of preparing dye pigments A water-insoluble dye pigment especially useful in the coloring of plastic articles and a method of preparing the same by hydrolyzing a water-soluble dye with an organooxysilane and drying the resultant gel.... | 02/17/1981 |
| 4250021 | Treating used hydrocarbon lubricating oils Process for removing metal(s) and water from used hydrocarbon lubricating oil characterized in that the said used oil is treated with an aqueous solution containing a surfactant and anions which form an insoluble salt or insoluble salts with at least one ... | 02/10/1981 |
| 4250160 | Production of ammonium sulfate A process for the production of ammonium sulfate in a multistage contactor (or column) inclusive of liquid cyclone recycle. A gas, or gases, which contains sulfur dioxide, e.g., a flue gas, is contacted with ammonia in an oxygen and water environment in a... | 02/10/1981 |
| 4248692 | Process for the discharge of ash concentrate from a coal deashing system A process for removing an agglomerate of accumulated materials including ash concentrate which collects within the first heavy phase withdrawal conduit of a coal deashing system employing solvent at elevated temperatures and pressures near the critical te... | 02/03/1981 |
| 4244937 | Sulfur dioxide oxidation catalyst and process A catalytic process for the oxidation of sulfur-containing gases, e.g., sulfur dioxide and simultaneous production of sulfuric acid wherein a sulfur-containing gas is reacted with an oxygen-containing gas in the presence of a catalyst comprising an iron g... | 01/13/1981 |
| 4244933 | Calcium carbonate particles and processes for preparing same The invention provides calcium carbonate particles comprising a core and projections formed thereon, and process for preparing same. The calcium carbonates of this invention are useful as fillers and pigments for rubbers, plastics, papers, etc. because of... | 01/13/1981 |
| 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 |
| 4242321 | Process for separating SO2 from a current of gas containing the same, and plant for carrying out such process A process is described for separating SO2 from a current of gas containing the same, at least intermittently, in a concentration which is impermissibly high for discharge into the ambient atmosphere, with attendant production of sulfuric acid b... | 12/30/1980 |
| 4242318 | Process for the preparation of aqueous suspensions containing at least 65% by weight of calcium carbonate Process for the preparation of an aqueous suspension containing at least 65% by weight of calcium carbonate, in which process calcium carbonate is crystallized in a dilute aqueous medium, a wet concentrate of calcium carbonate is separated from the result... | 12/30/1980 |
| 4242312 | Removal of sodium sulfate from a sulfate-containing sodium chloride solution in a process for separating zirconium and hafnium There is disclosed, in a process for separating zirconium and hafnium, an improvement for the removal of sodium sulfate from a sulfate-containing sodium chloride solution. This improvement includes adding a water-miscible organic precipitant such as metha... | 12/30/1980 |
| 4242328 | Process and compositions Dried amorphous aluminum hydroxide gels having substantial acid reacting capability over an extended period of time are prepared by drying the gel after contacting the aqueous liquid gel with an inert organic solvent of sufficient solubility in water to r... | 12/30/1980 |
| 4241041 | Methods for the recovery of sulfur components from flue gas and recycle sodium sulfite by reduction-smelting and carbonating to strip hydrogen sulfide An improved method for recovering sulfur from flue gas which contains sulfur dioxide formed from burning sulfur containing fuels. The method first involves the reduction burning of auxilary fuel in the presence of sodium sulfite to convert it to smelt con... | 12/23/1980 |
| 4241039 | Method of removal of arsenic from a sulfuric acid solution A method of removal of arsenic from an acidic solution, in which ferrous ions contained in the solution are oxidized in the presence of high pressured oxygen and sulfuric acid to ferric ions, the solution with said ferric ions being mixed with the solutio... | 12/23/1980 |
| 4239996 | Potassium carbonate recovery A process for reacting potassium carbonate with the sulfur in an MHD gas to form potassium sulfate and for recovering the potassium carbonate for recycle as a seeding material for the MHD gas.... | 12/16/1980 |
| 4239742 | Process for improving a gas containing a minor amount of sulfur dioxide impurity and producing a hydrogen sulfide-rich gas A process is provided for adsorbing sulfur dioxide impurity from an impure gas and producing a hydrogen sulfide-rich gas. In the process, a first adsorbate containing oxidized sulfur is produced by contacting the impure gas with an adsorbent comprising a ... | 12/16/1980 |
| 4238466 | Absorption of sulfur dioxide from gases by ferrous sulfate This application is directed to the use of ferrous sulfate for absorption of sulfur from gases containing the same. The invention is predicated on the reaction of the sulfur oxides with ferrous sulfate in the presence of oxygen to form principally ferric ... | 12/09/1980 |
| 4235861 | Production of iron oxide pigments and sodium sulphate In the production of iron oxide pigments and substantially iron-free sodium sulphate from iron sulphate by passing an oxygen-containing gas through an alkalized iron sulphate-containing solution at a temperature of about 40° to 100° C., and separating i... | 11/25/1980 |
| 4234560 | Process for treating a liquid with a gas and for preventing the phase separation of unreacted gas and liquid, in a circulatory reactor A process for treating a liquid with a gas in a circulatory reactor, in which the gas is introduced by a jet of liquid into a circulating liquid, is entrained downwards in a tube, rises in an annular space surrounding the tube and--if it has not reacted c... | 11/18/1980 |
| 4222999 | Removal of selenium from sulphate solutions A process for purifying copper sulfate solution by converting contained hexavalent selenium to tetravalent selenium which is amenable to removal from solution by heating and maintaining the solution at a temperature in the range of about 135° to 220° C.... | 09/16/1980 |
| 4218431 | Removal of sulfide contaminants from carbonate waters with production of CO2 -free H2 S Carbonate waters from subterranean and other sources which are contaminated with dissolved sulfides contribute to environmental pollution. Herein the sulfides are removed without otherwise polluting the environment by conversion to insoluble metal sulfide... | 08/19/1980 |
| 4218261 | Retarder for gypsum plaster and a process for retarding the setting of gypsum plaster by the use thereof A retarder for gypsum plaster is provided which consists essentially of ଲ-hydroxy-ଲ-carboxy-isocaproic acid or a water soluble salt thereof. It has powerful retarding effect toward gypsum plaster and gives a solid product having much better me... | 08/19/1980 |
| 4214979 | Method of thermally cracking heavy petroleum oil Disclosed herein is a method of thermally cracking a heavy petroleum oil by introducing the heavy petroleum oil into a reactor and contacting the heavy petroleum oil thus introduced with a gas, which does not react with the heavy petroleum oil, at a tempe... | 07/29/1980 |
| 4215100 | Method of producing potassium sulfate A method of producing potassium sulfate consists in conversion of sodium sulfate with potassium chloride in an aqueous medium to yield glaserite and a glaserite solution. Then, the glaserite is decomposed with potassium chloride in water to obtain potassi... | 07/29/1980 |
