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| Number | Title | Issue Date |
| 7175683 | Process for transforming sludge into NPK type granulated fertilizer A process for transforming sludge into npk type granulated fertilizer in which the energy consume is reduced a 90% thanks to the addition of a special filtration step in which the water content is reduced a 50% and the remaining water is evaporated by the exothermic... | 02/13/2007 |
| 6911191 | One-step oxidation of wet-process phosphoric acid A one-step method for production of green-colored, stabilized wet-process phosphoric acid in which black-colored, wet-process phosphoric acid containing incidental metallic impurities and a carbonaceous content of less than 1000 ppm is oxidized to produce a green-co... | 06/28/2005 |
| 6042629 | Fertilizer from brewery cleaning and rinsing solutions A process provides for the production of fertilizer solutions from brewery cleaning solutions. The process comprises the steps of combining a brewery caustic potash cleaning solution with a brewery nitrogen- or phosphorus-containing acid cleaning solution... | 03/28/2000 |
| 5824132 | Method of phosphoric acid concentration The wet process phosphoric acid evaporation, its clarifying, fertilizer production and fertilizer efficiency is improved in the presence of multi-component mixture of anionic surfactants and ammonium compound.... | 10/20/1998 |
| 5385596 | Treating of agricultural soil Agricultural soil is acidified by applying fertilizer, especially in the form of a clear solution, having an undesirably low pH value. The invention provides for applying a liquid neutralizing reagent in the vicinity of the fertilizer, and in the same ope... | 01/31/1995 |
| 5378258 | Method and an installation for producing granulated triple superphosphate (TSP) A method and an installation for producing granulated triple superphosphate wherein a premixer for phosphate and a phosphoric acid solution includes unclogging means comprising in combination a flexible axial sleeve of non-vulcanized elastomer for injecti... | 01/03/1995 |
| 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 |
| 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 |
| 5158594 | Granulated nitrogen-phosphorus-potassium-sulfur fertilizer from waste gypsum slurry Process for converting phospho-gypsum waste product from the wet process of manufacturing phosphoric acid from phosphate rock by ammoniating said product at a pH of 6.5 or less and adjusting the phosphorus and potassium values of said ammoniated product b... | 10/27/1992 |
| 5028252 | Method of and composition for the fertilization, detoxification and deacidification of soil A fertilizer composition and method for the detoxification and deacidification of soil threatened by acidic deposits which comprises at least one alkali-reactive component, selected from the group which consists of calcium, magnesium, potassium, sodium, a... | 07/02/1991 |
| 5022913 | Stabilized ammonium orthophosphate suspensions An improved batch process for the production, in equipment readily available at the fertilizer dealer level, of high-analysis stable ammonium orthophosphate suspension fertilizers effected by the ammoniation of solid intermediates derived from wet-process... | 06/11/1991 |
| 5019148 | Homogeneous mineral granules by acid-base reaction A stepwise method of preparing homogeneous mineral granules for agriculture by coreaction of commodity acids and bases which have properties to chemically form a transient fluid adhesive which will harden to form a strong granule binding cement. Water may... | 05/28/1991 |
| 4932993 | Batch production of suspension fertilizers using lignosulfonate In the production of suspension fertilizers the addition of an additive comprising lignosulfonate to the wet-process acid prior to the ammoniation step prevents severe thickening of the suspension during its formation, which severe thickening is normally ... | 06/12/1990 |
| 4867930 | Priller method A process for producing desired sized product granules characterized by dispensing on a flat moving horizontal bed product particulates from a heat exchange assembly, then mixing the product particulates with seed material by a mixing means for a period o... | 09/19/1989 |
| 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 |
| 4832928 | Method for producing ammonium polyphosphate A method of continuously producing ammonium polyphosphate by the reaction of urea and polyphosphoric acid, over a wide range of molecular weights, in a pre-mix slurry, under controlled temperature of about 315°+/-15° C. The slurry is reacted on a hot, c... | 05/23/1989 |
| 4792349 | Fertilizer values from galvanizer waste The present invention teaches a technique and provides for apparatus eminently useful for the econimic recovery of Fe, Zn, and S from waste galvinizer sulfuric acid and crystals of iron sulfate and zinc sulfate. The technique or method of the instant inve... | 12/20/1988 |
| 4758261 | Diammonium phosphate produced with a high-pressure pipe reactor Improved, simple, energy-efficient, and easy-to-operate process for producing granular diammonium phosphate (DAP) fertilizers from anhydrous ammonia, phosphoric acid, sulfuric acid, and water utilizing a rotating drum granulator and a pipe reactor in comb... | 07/19/1988 |
| 4744965 | Process for producing granular diammonium phosphate A process is disclosed for the manufacture of granular diammonium phosphate (DAP) by reacting anhydrous ammonia with phosphoric acid in a reactor to form reaction product consisting of a partially reacted slurry of monoammonium phosphate and diammonium ph... | 05/17/1988 |
| 4721519 | Stable ammonium polyphosphate liquid fertilizer from merchant grade phosphoric acid A stable ammonium polyphosphate liquid fertilizer is prepared from concentrated wet-process phosphoric acid of 54-62% P2 O5, which prior to concentration is treated with a cation exchange resin to remove magnesium and calcium without... | 01/26/1988 |
| 4687651 | Method for producing ammonium polyphosphate A method of continuously producing ammonium polyphosphate by the reaction of urea and polyphosphoric acid, over a wide range of molecular weights, in a pre-mix slurry, under controlled temperature of about 315°+/-15° C. The slurry is reacted on a hot, c... | 08/18/1987 |
| 4652295 | Fertilizer manufacture An improved continuous process for the production of fertilizers, wherein the reactions, mixing, sizing, and moisture removal required to produce a resultant product are carried out on a simple, flat surface that moves horizontally, and wherein, in the re... | 03/24/1987 |
| 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 |
| 4637921 | Process for producing ammonium polyphosphate An improved process of concentrating wet process phosphoric acid by continuously contacting an acid feed containing at least about 56 weight percent of P2 O5 based on the total weight of the feed with heated gases consisting of air a... | 01/20/1987 |
| 4634533 | Method of converting brines to useful products A process is provided for the recovery of one or more useful products including fertilizer, animal feed supplements, iron oxide, magnesia, salt, purified brine, and purified water from brines. The source of the brines can be oil and gas field wastes, seaw... | 01/06/1987 |
| 4619684 | Pressure reactor for producing diammonium phosphate Process for producing diammonium phosphate (DAP) fertilizer from phosphoric and sulfuric acids, anhydrous ammonia, and water in a specially designed reactor operated at high pressures to granulate diammonium phosphate at low recycle ratios and with relati... | 10/28/1986 |
| 4604126 | NP/NPK fertilizer granules comprised of ammonium phosphate Granular fertilizer solids comprising ammonium phosphate, advantageously particulate NP/NPK fertilizers, are prepared by (i) granulating a liquid/dry solids admixture of fertilizer values in a granulation zone, (ii) next transferring said admixture to, an... | 08/05/1986 |
| 4601891 | Production of granular ammonium polyphosphate from wet-process phosphoric acid An improved process for the production of granular ammonium polyphosphate fertilizer of a nominal 11-56-0 grade resulting from the pressure ammoniation of phosphoric acid without the use of a preneutralizer and using a specially designed pipe reactor to e... | 07/22/1986 |
| 4592771 | Method of producing di-ammonium phosphate fertilizer A novel method is provided to produce di-ammonium phosphate fertilizer by operating a DAP reactor and granulator in such a manner that part of the hot exhaust gases from the DAP reactor are diverted into a vaporizer where liquid ammonia is vaporized for u... | 06/03/1986 |
| 4576627 | Method of providing fertilizer from brines A process is provided for the recovery of one or more useful products including fertilizer, salt, and/or purified process water from brines. The source of the brines can be oil field wastes, seawater, or other inland brine sources. Phosphoric acid is init... | 03/18/1986 |
| 4537615 | Fertilizer from phosphorus furnace waste stream Processes and compositions of matter are disclosed for the production of liquid fertilizers wherein wastewater from a phosphorus smelting furnace is incorporated in liquid fertilizer processes. The wastewater replaces water evaporated and the wastewater d... | 08/27/1985 |
| 4536378 | Phosphate fertilizer production Processes for the preparation of phosphoric acid, such as merchant phosphoric acid, and for the provision of phosphoric acid suitable for the preparation of ammonium phosphates, are disclosed. Such processes comprise providing a source stream of phosphori... | 08/20/1985 |
| 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 |
| 4512793 | Granulation of urea phosphate from urea and merchant-grade phosphoric acid A process for direct granulation of unpurified urea phosphate from urea and merchant- or filter-grade wet-process phosphoric acid to produce a product with exceptional satisfactory physical and chemical properties for direct application to the soil or for... | 04/23/1985 |
| 4511388 | Production of high-analysis ammonium orthophosphate suspension fertilizers by a new batch-type process An improved process for the production of highly concentrated (N-P2 O5) suspension fertilizers effected by the ammoniation of wet-process or other impure orthophosphoric acids in batch-type equipment. The underlying concept which goe... | 04/16/1985 |
| 4511389 | Manufacturing and using nitrogen fertilizer solutions on a farm To make and use nitrogenous fertilizer on a farm, nitrogen dioxide is prepared in a continuous process from air or from ammonia in a reactor, with the ammonia either being transported to the farm or being prepared on the farm in a continuous process from ... | 04/16/1985 |
| 4505733 | Process for producing liquid combined fertilizers The process for producing liquid combined fertilizers according to the present invention comprises neutralization of extraction-type phosphoric acid with an excess of gaseous ammonia taken in an amount of 1-1.2 parts by weight relative to the content ther... | 03/19/1985 |
| 4500502 | Process for removing impurities from wet process of phosphoric acid A method of preparing a purified ammoniated phosphoric acid composition, comprising, reacting an aqueous wet process phosphoric acid with an ammonium ion source at a N/P2 O5 weight ratio ranging from about 0.06 to about 0.15 in the p... | 02/19/1985 |
| 4493820 | Process for partial removing of impurities from a wet process phosphoric acid A process for the partial removal of impurities present in a wet process phosphoric acid used in the production of granulated mono- or di-ammonium phosphate fertilizers in order to control the grade of the final product. All or a portion of the liquid fro... | 01/15/1985 |
