Class 423/541.4 - Ammonium sulfate

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Processes which include the step of using sulfate of ammonium
No. of patents: 23
Last issue date: 01/21/1992

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Number	Title	Issue Date
5082645	Waste acid recovery process A process for the recovery of sulphuric acid from a waste acid stream containing ammonium sulphate comprising vaporizing the waste acid and subsequently converting the ammonia and sulphur dioxide generated to nitrogen and sulphur trioxide, respectively. T...	01/21/1992
4872887	Method for flue gas conditioning with the decomposition products of ammonium sulfate or ammonium bisulfate A method is provided for enhancing the efficiency of fly ash collection in an electrostatic precipitator by lowering the resistivity of the fly ash particles in the flue gas, comprising the steps of introducing an aqueous solution of ammonium sulfate or a...	10/10/1989
4677074	Process for reducing sulfur-containing contaminants in sulfonated hydrocarbons Processes of reducing the inorganic sulfur-containing acid and the low equivalent weight organic sulfonic acid content of an acid mass comprising organic sulfonic components and inorganic sulfonating agent contaminants are described. In general, the proce...	06/30/1987
4533364	Method for flue gas conditioning with the decomposition products of ammonium sulfate or ammonium bisulfate A method is provided for enhancing the efficiency of fly ash collection in an electrostatic precipitator by lowering the resistivity of the fly ash particles in the flue gas, comprising the steps of introducing an aqueous solution of ammonium sulfate or a...	08/06/1985
4251495	Process for purifying a hydrogen sulfide containing gas Process for purifying a gas containing hydrogen sulfide, optionally with carbon dioxide, particularly adapted to the purification of gases of relatively low hydrogen sulfide content, e.g. not in excess of 1% of H2 S by volume, comprising contac...	02/17/1981
4208390	Process for the recovery of ammonia and sulphur dioxide from a contaminated ammonium salt of sulphuric acid An improved process for the recovery of ammonia and sulphur dioxide from a by-product mixture containing an ammonium salt of sulphuric acid obtained as a by-product in the preparation of &3xb5;-caprolactam or cyclohexanone oxime. The by-product mixture is...	06/17/1980
4180550	Process for purifying a sulfur dioxide containing gas by washing with an ammonia aqueous solution Process for purifying a sulfur dioxide containing gas, by washing with an ammonia aqueous solution, comprising the following steps: (a) contacting a sulfur dioxide containing gas with ammonia and/or ammonium sulfite in the presence of water, to form a solution...	12/25/1979
4164543	Process for regenerating brines containing sodium sulfites and sulfates Process for regenerating brines containing simultaneously sodium sulfites and sulfates so as to produce sulfur dioxide and an alkaline solution usable for absorbing sulfur dioxide, comprising contacting the brine with ammonium bisulfate, sodium bisulfate ...	08/14/1979
4146579	Process for converting sulfitic solutions by means of ammonium bisulfate with SO₂ production This process avoids the disadvantages of admixing hot molten ammonium bisulfate with ammonium sulfites solutions. Overflowing hot molten ammonium bisulfate is admixed with a stream of aqueous ammonium bisulfate solution, said solution being preferably cir...	03/27/1979
4133810	Process for the recovery of &3xb5;-caprolactam from a reaction mixture of &3xb5;-caprolactam and sulfuric acid An improvement of processes for the recovery of &3xb5;-caprolactam wherein a neutralized sulfuric acid is subjected to thermal decomposition, forming a gaseous mixture of ammonia and sulfur dioxide which is thereafter converted to an aqueous solution of a...	01/09/1979
4081515	Catalytic conversion of an ammonium sulfate to sulfur dioxide and ammonia Molten ammonium sulfate is converted to ammonia and sulfur dioxide by heating in the presence of at least one molybdenum and/or tungsten compound, preferably at a temperature in the range of 350° to 500° C....	03/28/1978
4073862	Process for removing ammonia, hydrogen sulfide and hydrocyanic acid from gases A process is provided for removing ammonia, hydrogen sulfide and hydrocyanic acid from gases such as coke oven gas. In carrying out the process, the gas to be cleaned is first washed with an alkaline solution to remove the hydrogen sulfide and hydrocyanic...	02/14/1978
4062931	Process for purifying gases In purifying a gas containing at least one of hydrogen cyanide and hydrogen sulfide as a harmful component by fixing the harmful component in water as an aqueous solution of nitrogen-containing sulfur compound so as to render the gas free of the harmful c...	12/13/1977
4054562	Process for the manufacture of lactams In a process for manufacturing a lactam which includes rearranging a cycloalkanone-oxime with sulfuric acid to form the lactam, neutralizing the rearrangement mixture with ammonia to form ammonium sulfate, and separating the lactam and the ammonium sulfat...	10/18/1977
4049646	Process for the manufacture of lactams In a process for manufacturing a lactam which includes rearranging a cycloalkanone-oxime with sulfuric acid to form said lactam, neutralizing the rearrangement mixture with ammonia to form ammonium sulfate, and separating said lactam and said ammonium sul...	09/20/1977
4043822	Treatment of water-soluble metal sulfate residues Process for transforming water-soluble metal sulfate residue obtained from spent sulfuric acid containing inorganic impurities, such as pickle liquors or acid wastes from hydrometallurgical processes, into substantially water-insoluble form suitable for d...	08/23/1977
4029745	Process for reducing molten ammonium sulfates containing metallic impurities to ammonia and sulfur dioxide Molten ammonium sulfates containing iron sulfate as an impurity may be reduced with sulfur or a sulfur compound over long periods provided a fraction of these impure ammonium sulfates is withdrawn, treated for iron removal and fed back to the reduction zo...	06/14/1977
4001374	Process for removing ammonia from gases A process to remove ammonia from gases by washing the gases with an inorganic acid of ammonium bisulfite. The ammonia removed from the gas transforms the washing liquid into ammonium salt solution. This salt solution then undergoes a separate processing b...	01/04/1977
3991047	Process for preparing lactams In a process for the preparation of lactam from cycloalkanone comprising reacting said alkanone with hydroxylamine sulfate to form the corresponding cycloalkanone oxime followed by Beckman rearrangement to yield said lactam and neutralization of the sulfu...	11/09/1976
3954955	Process for working up the wash solution obtained in the washing of SO₂ -containing off-gases In a process which comprises scrubbing an SO2 -containing gas with an aqueous ammonia solution to form ammonium sulfite and ammonium bisulfite as reaction products, neutralizing said reaction products with sulfuric acid to form SO2 a...	05/04/1976
3950502	Process for working up the scrubbing solution obtained in the scrubbing of So₂ -containing waste gases Process for working up the scrubbing solution obtained during the scrubbing of SO2 -containing waste gases, which can also contain SO3, with the use of ammonia, by evaporation in direct heat exchange with hot cracked gas to a water c...	04/13/1976
3944657	Sulfur dioxide from by-product ammonium sulfate solutions In a process of concentrating an aqueous solution of ammonium sulfate and burning resultant concentrate at 850°-1250°C to form a combustion gas containing SO2, the improvement which comprises: Conducting said concentrating by passing said combusti...	03/16/1976
3943237	Production of sulfuric acid from the scrubbing solution obtained in the desulfurization of coke-oven gas Scrubbing solutions containing ammonium salts of weak acids are mixed with sufficient sulfuric acid to react with all the salts; the resultant solutions are evaporated by direct heat exchange with a hot SO2 -containing combustion gas to a 40-78...	03/09/1976

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Class 423/541.4 - Ammonium sulfate