Class 423/243.02 - And addition of gaseous reactant

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Process wherein a reactant is added that is in a gaseous
No. of patents: 32
Last issue date: 08/26/2008

Number	Title	Issue Date
7416716	Purification of carbon dioxide SO2 and/or NOx are removed from gaseous CO2 at elevated pressure(s) in the presence of molecular oxygen and water and, when SO2 is to be removed, NOx, to convert SO2 to sulfuric acid and/or NOx	08/26/2008
6863875	Flue gas treating system and process In a flue gas treating system, an absorption tower (21), a reheating section (22) and a fan (23) are arranged in line on a vertical axis so as to function as at least a part of a stack for emitting the treated flue gas into the atmosphere. Moreo...	03/08/2005
6773555	Method for treating exhaust gas The present invention relates to a flue gas treatment method and apparatus for removing sulfur oxides by injecting ammonia into flue gas containing sulfur oxides. In the flue gas treatment method for removing sulfur oxides contained in the flue gas using ammonia, th...	08/10/2004
6503471	Process for malodorous gas treatment Malodorous gases such as amines, organosulfur compounds, hydrogen sulfide, styrene and aldehydes are economically and efficiently treated at ambient temperature and pressure by a catalytic absorption and oxidation process comprising: (a) bringing the malo...	01/07/2003
6447740	Mercury removal from flue gas The invention is directed to a process for oxidizing gaseous pollutants in a flue gas stream composed of flue gases, water vapour and one or more gaseous pollutants selected from the group consisting of SO2, NO, NO2, H2 S,...	09/10/2002
6033576	Chemical waste treatment A method for accelerating the treatment of chemical wastes, particularly recalcitrant wastes such as spent caustic, from the oil, gas, chemical, and petrochemical industries, in which normally slow physical mass transfer of different fluid phases, as well...	03/07/2000
5958335	Method and apparatus for preventing corrosion of exhaust gas treatment systems A corrosion preventive method and an apparatus for preventing corrosion of stainless steel components in an exhaust gas desulfurizing apparatus of an exhaust gas treatment system comprising the exhaust gas desulfurizing apparatus for removing at least sul...	09/28/1999
5674464	Desulphurization of waste gases The present invention relates to a process for the removal of sulphur dioxide from waste gases which process comprises contacting a waste gas containing sulphur dioxide with an aqueous solution containing sulphuric acid, hydrogen bromide and bromide to fo...	10/07/1997
5443805	Reduction of combustion effluent pollutants Injection of additive such as ammonia or calcium compounds along with a small amount of hydrocarbon, preferably methane or natural gas, in a relatively high temperature region of the effluent stream for effectively reducing pollutants such as NOx	08/22/1995
5244643	Treatment of oxygen containing gaseous hydrocarbons for mercaptan removal Fuel gas streams containing oxygen are treated by a process that performs simultaneous sweetening and absorption of mercaptan compounds. The mercaptan oxidation catalyst and an aqueous alkaline solution and a low vapor pressure liquid hydrocarbon stream c...	09/14/1993
5206002	Process for removing NO_x and SO_x from exhaust gas Exhaust gases containing oxides of nitrogen and sulfur from a fired process heater, a fossil fuel fired boiler, or a chemical process are diverted from a stack prior to admission to the atmosphere through a duct system containing heat exchangers that redu...	04/27/1993
5169610	Method for the purification of rare earth oxysulfide An efficient method is proposed for decolorizing a rare earth oxysulfide, which is usually slightly colored in grey as prepared by the sulfiding reaction of a rare earth oxide with hydrogen sulfide, by removing sulfur impurity. The method comprises two st...	12/08/1992
5053210	Method for the purification of flue gases A process and an apparatus for the purification of gases, particularly for the desulphurization of and NOx -elimination from flue gas by multistage adsorption and catalytic reaction in gravity-flow moving beds of granular, carbon-bearing materi...	10/01/1991
4883647	Use of manganese nodules or deep-sea ores containing manganese for the reduction of nitrogen oxides in exhaust gases The invention relates to the use of manganese nodules or deep-sea ores containing manganese of more recent or older crustal layers as catalysts or for the manufacture of catalysts for the reduction of NOx components in exhaust gases or for the ...	11/28/1989
4851202	Process for the simultaneous removal of nitrogen oxides and sulfur dioxide from an oxygen-containing exhaust gas Disclosed is a process of simultaneously removing nitrogen oxides and sulfur dioxide from an oxygen-containing exhaust gas. An exhaust gas containing NOx and SO2 is mixed with NH3 and is then introduced as a fluidizing gas into...	07/25/1989
4836991	Method for controlling wet-process flue gas desulfurization Optimum overall operation of a whole plant including a combustion unit such as a boiler and a wet-process flue gas desulfurization unit comprising an absorption column for removing sulfur dioxide from a flue gas from the combustion unit by absorption usin...	06/06/1989
4810476	Process and apparatus for catalytically reducing noxious substances in flue gas An apparatus and process for catalytically reducing noxious substances in flue gas wherein a heat exchanger is traversed from a top section to a bottom section by a plurality of heat storage elements which are separately movable and are charged by the flu...	03/07/1989
4780290	Method for purifying flue gas A tower type reactor has two treatment stages through which a stream of granular bulk material passes downwardly to cool an upwardly flowing flue gas to the dew point temperature of the gas. In addition, a treatment agent is contacted with the flue gas so...	10/25/1988
4649033	Process to eliminate air pollutants which result from the combustion of fuels containing sulphur Process to eliminate air pollutants which result from the combustion of fuels containing sulphur, permitting the transformation of substantially all the existing SO2 and SO3 produced by the combustion of fuels to ammonium sulphate....	03/10/1987
4588567	Recovery of concentrated H₂ S from SO₂ contained in flue gas This invention is a regenerable process for producing gaseous hydrogen sulfide in concentrated form from sulfur dioxide obtained from a dilute gas source by (1) reacting the SO2 with a concentrated solution of Na2 SO3 to f...	05/13/1986
4557912	Air pollution reduction The method of reducing air pollution comprises treating air-polluting waste industrial flue gases containing sulfur dioxide in a manner effective to substantially reduce the content of sulfur dioxide therein and remove it in the form of a sulfuric acid by...	12/10/1985
4366133	Process for limiting chloride buildup in SO₂ scrubber slurry In the process of scrubbing flue gas to remove pollutants therefrom by contacting the flue gas with an aqueous reactant mixture of water and pollutant absorbent, water soluble chloride impurities present in the flue gas and make-up water tend to build-up ...	12/28/1982
4322393	Process for drying calcium chloride generated in high chloride flue gas desulfurization systems Some flue gas desulfurization processes applied to fuels containing high chloride concentrations are utilizing, or plan to utilize, by-product gypsum from the process stream. The utilization of such a process results in a calcium chloride buildup in the f...	03/30/1982
4321241	Process for the purging of flue gases containing acidic components Flue gas containing sulfur dioxide, carbon dioxide and other acidic components is desulfurized by washing it with an aqueous washing solution to which ammonia has been added in the stoichiometrically necessary amount for reaction with the sulfuroxides. Th...	03/23/1982
4231996	Method for producing ammonia and hydrogen sulfide A method for producing ammonia and hydrogen sulfide in a molar ratio (NH3 /H2 S) from about 2.8 to about 3.7 from an aqueous ammonium thiosulfate solution by a method consisting essentially of: (a) contacting the aqueous ammonium thi...	11/04/1980
4201754	Method for the conversion of calcium sulfoxy compounds into calcium carbonate compounds in sulfur oxide treatment processes A method for converting calcium sulfoxy compounds selected from the group consisting of CaSOx and Ca(HSOx)2 and their hydrates wherein x is 3 or 4 into calcium carbonate, the method consisting essentially of; converting th...	05/06/1980
4187282	Process for treating a waste gas containing sulfur oxides A waste gas containing sulfur oxides is contacted with an adsorbent comprising an intimate mixture of an iron oxide and/or a copper oxide and a titanium oxide at a temperature of 250°-500° C. The sulfur oxides thus adsorbed are desorbed with a reducing ...	02/05/1980
4064219	Method of injecting ammonia into a flue for waste gases The method is characterized by bringing a mixture of ammonia and air to a temperature substantially equal to the temperature of the waste flue gas in the flue at the exit of an air heater, and then injecting the mixture into the flue from a number of nozz...	12/20/1977
4061715	Process for conversion of alkaline earth sulfites and bisulfites into oxides and carbonates There is disclosed a process for converting an alkaline earth metal sulfite or bisulfite selected from the group consisting of the sulfites or bisulfites of calcium and magnesium into an oxide form by reaction with hydrogen and water vapor at elevated tem...	12/06/1977
3987147	Process to desulfurize gas and recover sulfur A continuous cyclic process for removing sulfur dioxide from gases produced in the combustion of fossil fuels or in chemical and metallurgical operations by means of an aqueous solution including the carbonate of an alkali metal to absorb said oxide out o...	10/19/1976
3974257	Process for removing sulfur dioxide contained in a gas A SO2 containing gas, for example a stack gas, is purified according to a multi-step process, which comprises washing said gas with an aqueous ammonia solution, treating the resulting solution with hydrochloric acid, whereby SO2 and ...	08/10/1976
3937787	Treatment of gases containing sulfur dioxide An improvement in regenerative SO2 scrubbing systems which use sodium, potassium or ammonium carbonate to react with the SO2 to form sulfite, wherein a thiosulfate-rich aqueous solution of the carbonate is used to prevent oxidation o...	02/10/1976

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Class 423/243.02 - And addition of gaseous reactant