Class 71/40 - Sulfuric acid

Subclass of Class 71 - Chemistry: fertilizers
Definition: Processes wherein the acid used in H2SO4.
No. of patents: 34
Last issue date: 02/12/2002

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Number	Title	Issue Date
6346131	Fertilizer compositions for administering phosphates to plants A plant fertilizer composition that includes an acid whereby said acid may react with, chelate, or block any metal ions in the soil in which the plants grow during administration of the fertilizer. This reaction renders the metal ions substantially ineffe...	02/12/2002
6231767	Treatment of phosphatic wastes A process for treating thickened phosphatic clay suspensions, waste clay and phosphogypsum produced in the processing of phosphate ore by water beneficiation and chemical processing, the thickened phosphatic clay suspension having a solid content of from ...	05/15/2001
5308372	Vegetable oil processing to obtain nutrient by-products A method of processing vegetable oil in which non-toxic reagents are used, so that a waste stream is evolved suitable for use as a nutrient source and wherein the non-toxic reagents include nutrient components whereby the nutrient value of the waste strea...	05/03/1994
5275639	Recovery of phosphates from elemental phosphorus bearing wastes A process for oxidizing aqueous elemental phosphorus containing residues (sludges) to produce orthophosphate containing slurries suitable for subsequent reaction with ammonia to produce nitrogen- and phosphorus-containing fertilizer products. It comprises...	01/04/1994
5211735	Process for preparing phosphated or nitrophosphated fertilizers through solubilization of phosphate rock The invention aims at a process for preparing phosphated or nitrophosphated fertilizers through reaction of phosphate rock in aqueous pulp, with sulfuric and/or phosphoric acids, with addition, or not, of ammonia, so as to produce fertilizers of the types...	05/18/1993
4939165	Photoactive bithienyl pesticides Bithienyl compounds of the following structural formula are phototoxic insecticides and acaricides: ##STR1## wherein R1 is selected from hydrogen, halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, haloalkenoxy, phenyl, phenoxy, nitro, alkylsu...	07/03/1990
4836843	Fertilizer process A method of fertilizing soil comprising the steps of treating soapstock with an acid containing phosphorus compounds, separating the acid oil from the acid water, and using the resulting acid water as fertilizer, or fertilizer component. Such use is parti...	06/06/1989
4834787	Phosphate rock utilization A process providing solubilization of phosphate rock by contacting the rock with sulfurous acid in the presence of an oxidizing agent selected from the group consisting of hydrogen peroxide and ozone. Use of sulfurous acid in combination with a substoichi...	05/30/1989
4710364	Continuous recovery of sulfur oxide from flue gas A process for removing sulfur dioxide from flue gas is disclosed. After passing through a precipitator to remove particulate material, the flue gas is conducted continuously through a fixed bed solid-gas contacting device containing activated carbon or na...	12/01/1987
4650682	Acidifier-ammoniator Apparatus and process for chemically treating particulate solids material in free flowing condition with fluid reactants in a drum reactor having an acidifying chamber in which acid is introduced into the solids material and an ammoniation chamber in whic...	03/17/1987
4594090	High nutrient content fertilizers A method of making fertilizer comprising the steps of mixing an aqueous solution of sulfuric acid with diammonium phosphate in a weight ratio of diammonium phosphate to sulfuric acid from about 3 to about 5, and mixing the resulting reaction products with...	06/10/1986
4568374	Process for the preparation of fertilizers by the partial solubilization of phosphate rocks The object of the invention comprises a process for the preparation of fertilizers by solubilizing phosphate rocks containing impurities, which make processing thereof difficult. The process is a simple and direct one. The product thus prepared is easily ...	02/04/1986
4522638	Method and apparatus for regulating the NH₃ content in scrubbing liquid used in a gas scrubbing process A process for regulating the NH3 content in an organic liquid that acts as a physical scrubbing agent and is used in a procedure for absorbing sour gases from gaseous mixtures. To ensure undisturbed and reliable carrying out of the scrubbing pr...	06/11/1985
4469504	Process for the partial solubilization of phosphate rock and obtaining acid and phosphate fertilizers therefrom A rapid, low temperature process for solubilizing phosphate rocks having high content of foreign matter or a low phosphorus content to obtain: (a) a slow release fertilizer of the NP type; (b) phosphoric acid of high concentration plus MAP; and (c) DAP....	09/04/1984
4462972	Method for producing fertilizer-grade phosphoric acid A process for producing fertilizer-grade phosphoric acid is disclosed. In the process, a rock slurry is produced from a predetermined quantity of phosphate rock and a predetermined quantity of pond water neutralized with ammonia. A predetermined rate of s...	07/31/1984
4397675	Method of producing urea-sulfuric acid reaction products Stable, urea-sulfuric acid reaction products of predetermined composition containing mono- and/or diurea sulfates and less than 35 weight percent water are produced from concentrated, urea-sulfuric acid reaction product feeds of different compositions by ...	08/09/1983
4388101	Non-pressure nitrogen carrier fertilizer solutions and dispersions and process of manufacture A "non-pressure" liquid fertilizer containing nitrogen and sulfur can be prepared by a process comprising (a) mixing sulfuric acid in water, (b) dissolving urea into the resulting solution, and (c) adding anhydrous ammonia in an amount sufficient to bring...	06/14/1983
4336053	Fertilizer solutions stabilized with inorganic acids A stable liquid fertilizer solution containing nitrogen, phosphorus, iron and optionally sulfur is prepared by mixing a water-soluble iron compound with ammonium polyphosphate and water to produce an iron phosphate slurry having a molar ratio of polyphosp...	06/22/1982
4321077	Method of preparation of multicomponent fertilizers The subject of the invention is the method of preparation of multicomponent fertilizers based upon the decomposition process of mineral phosphate material by ammonium sulphate and sulphuric acid. This method has application in chemical industry. The inven...	03/23/1982
4308049	Process for the absorption of ammonia in acid solutions or slurries A process is disclosed for the absorption of gaseous or liquid ammonia in acid solutions or slurries, including an ammonia absorption zone separated from a water vapor generation zone disposed at a higher level. A pressure difference is created between th...	12/29/1981
4252553	Process for production of fertilizers A process for the production of fertilizer by reacting sulfur oxide containing gas and water in a multiple state reactor to form sulfur containing acid and reacting the sulfur containing acid with a basic salt which may be solubilized as a result of the a...	02/24/1981
4231780	Treatment of phosphate rock on soil in situ with sulfuric acid A layer of bare, untreated phosphate rock granules is applied to the soil, and concentrated sulfuric acid is supplied thereto. The sulfuric acid is sufficiently concentrated so as to be containable by cold-rolled carbon steel, and sufficiently viscous to ...	11/04/1980
4177053	Method for the production of phosphoric acid with high contents of fertilizer-nutrients Phosphoric acid with a high fertilizer-nutrient content is produced by decomposing phosphate rock with nitric acid followed by precipitation of calcium ions with sulfate. The steps of the process are as follows: A. Decomposing phosphate rock with (7-2x) to (17...	12/04/1979
4175944	Removal of fluorine during production of fertilizer The invention provides a novel process for the removal of fluorine during the production of fertilizer by precipitating the ion during the ammoniation step and recovering same by pyrolysis. To recover the fluorine the fertilizer is first separated out as a fil...	11/27/1979
4168150	Process for production of fertilizers A process for the production of fertilizer by reacting sulfur oxide containing gas and water in a multiple state reactor to form sulfur containing acid and reacting the sulfur containing acid with a basic salt which may be solubilized as a result of the a...	09/18/1979
4077794	Method for the manufacture of soil modifiers from waste materials of the manufacture of titanium dioxide A soil modifier comprising from 80 to 95% by weight of a mixture of ferric oxide and ferric sulphate in an oxide/sulphate weight ratio of from 0.25:1 to 1:1, is prepared by calcining at 500°-600° C in an oxidizing atmosphere a blend of by-product obtain...	03/07/1978
4073635	Process for producing a slurry suitable for the manufacture of a mixed fertilizer containing nitrogen plus phosphorus Crude phosphate is leached with nitric acid to produce an acid slurry, which is thereafter neutralized with ammonia in two successive stages while simultaneously cooling it and adding acid, part of the crude phosphate phosphorus being replaced with phosph...	02/14/1978
4073634	Process for production of fertilizers A process for the production of fertilizer comprising reacting sulfur oxide containing gas and water in a multiple state reactor to form sulfur containing acid, reacting the sulfur containing acid with a basic ion selected from the group consisting of cal...	02/14/1978
4045205	Method for the manufacture of soil modifiers from waste material of the manufacture of titanium dioxide Soil modifiers comprising from 80 to 95% by weight of a mixture of ferric oxide and ferric sulphate in an oxide/sulphate weight ratio of from 0.2:1 to 2:1 are prepared by calcining at 500°-600° C in the presence of an oxidizing gas a material consisting...	08/30/1977
4028087	Fertilizer processes incorporating scrubbed flue gas sludge byproduct A process for the production of a granular fertilizer material from sludge materials discharged from scrubbing processes that remove pollutants from boiler flue gases. Waste sludge discharged from flue gas scrubber systems often contain large amounts of c...	06/07/1977
4007030	Process for the simultaneous manufacture of phosphoric acid or the salts thereof and a complex multi-component mineral fertilizer In the process according to the invention, raw phosphate rock is decomposed with an aqueous solution of sulfuric acid and ammonium sulfate recycled from the conversion step of phosphogypsum into chalk, and then the decomposition liquor stream is divided i...	02/08/1977
3979199	Treatment of phosphate rock in soil to provide fertilizer and gypsum Pulverized phosphate rock is spread onto or mixed into soil which is to be fertilized. The soil is then treated with a solution of sulfurous acid, usually the output of a device which burns sulfur in air to form sulfur dioxide and then dissolves the sulfu...	09/07/1976
3962329	Manufacture of granular isobutylidenediurea The preparation of isobutylidenediurea from isobutyraldehyde and urea, the particle size of the product being controlled by alternate use of sulfuric acid and phosphoric acid....	06/08/1976
3947262	Method of producing phosphorus-containing fertilizers A method of producing phosphorus-containing fertilizers, wherein the phosphate raw stock is treated with a mineral acid selected from the group, consisting of phosphoric acid, sulphuric acid and a mixture of both. The thus-obtained suspension of the phosp...	03/30/1976

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Class 71/40 - Sulfuric acid