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| Number | Title | Issue Date |
| 7258848 | Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide The present invention provides a process for removing ammonia as an aqueous salt solution from an acid gas comprising ammonia and hydrogen sulfide. A strong acid, such as sulfuric acid, is used as a scrubbing agent to convert ammonia to an ammonium salt. Control of ... | 08/21/2007 |
| 7195747 | Process for mixing and reacting two or more fluids A novel process for continuously mixing and reacting at least two fluids are disclosed. Excellent mixing and superior pressure drop characteristics are achieved using cyclone mixing where at least two supply channels feed a mixing chamber to create a vortex of the f... | 03/27/2007 |
| 7128880 | Organic recycling with a pipe-cross or tubular reactor The invention is directed to a process for enhancing the plant nutrient value of relatively low analysis organic waste material (e.g. sewage sludge) involves treating the waste material with an acid and base in a pipe-cross reactor or tubular to form a melt; sprayin... | 10/31/2006 |
| 6949236 | Aminosulfonate product-treated nitrogen-containing salt particles Addition of an aminosulfonate product to an inorganic nitrogen-containing salt provides a composition of matter with improved properties. In particular, 2-acrylamido-2-methylpropanesulfonic acid and its derivatives can be added to ammonium nitrate to provide improve... | 09/27/2005 |
| 6280494 | Method for producing fertilizer grade DAP having an increased nitrogen concentration in a spray column A process of forming a mixture of diammonium phosphate and triammonium phosphate by the reaction of phosphoric acid with gaseous ammonia in a spray column. In the process, the reaction occurs under pressure. With the appropriate selection of the ammonia p... | 08/28/2001 |
| 6241796 | Method for producing fertilizer grade DAP having an increased nitrogen concentration from recycle A process for the preparation of granular fertilizer grade DAP (a product composed of ammonium phosphates, principally diammonium phosphate, resulting from the ammoniation of phosphoric acid, as defined in Official Publication No. 52 of the Association of... | 06/05/2001 |
| 6117406 | Process for manufacturing ammonium salts A process for manufacturing ammonium salts using a reactor which includes a first tubular reaction chamber having at least one acid feed and at least on ammonia feed which are arranged in a first up-stream part of the reactor. At least one second ammonia ... | 09/12/2000 |
| 5578107 | Water soluble caking inhibitors for ammonium phosphates There is disclosed a caking inhibitor for mono-and diammonium phosphates which is water soluble and effective at small concentrations rendering the phosphates acceptable in most utilities without separation of the inhibitor. The inhibitor is sodium sulfat... | 11/26/1996 |
| 5244645 | Process for removing NH3 from a liquid stream This invention is a process for removing NH3 from a NH3 -containing liquid stream. The process contains the following steps: (a) passing a NH3 -containing first liquid stream, a heated first gaseous stream, and an ammonium... | 09/14/1993 |
| 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 |
| 4919906 | Processes and equipment for production of elemental phosphorus and thermal phosphoric acid New processes and equipment are disclosed for producing elemental phosphorus and thermal phosphoric acid. Benefits are listed below. 1. Phosphorus-containing solids are recycled to smelting furnaces thus eliminating hazardous waste generation. 2. Phosphorus fu... | 04/24/1990 |
| 4781905 | Process for producing phosphoric acid and/or phosphates from wet-process phosphoric acid and an extractant therein A process is developed for producing phosphoric acid and phosphates from wet-process phosphoric acid. The crude acid is extracted with a waterimmiscible solvent mixture consisting of mixed trialkyl phosphine oxide and a diluent, wherein about 2/3 P2 | 11/01/1988 |
| 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 |
| 4704262 | Process for production of dialkali metal phosphates by ion exchange A process for the production of dialkali metal phosphates by ion exchange is disclosed. The process is carried out by first ammoniating a water-soluble phosphate source such as phosphoric acid or monocalcium phosphate. The resulting ammoniated phosphate s... | 11/03/1987 |
| 4678650 | Process for making an alkali phosphate solution An aqueous alkali phosphate solution is made. An organic phase is countercurrently mixed with an aqueous phase, the two phases being used in a volume ratio larger than 1:1 and formed aqueous alkali phosphate solution is separated from the remaining organi... | 07/07/1987 |
| 4662929 | Method for recovering nutrients from the flue gases of a fertilizer plant The invention relates to a method of recovering nutrients from the flue gases of a fertilizer plant by exposing hot, almost water-saturated reaction gases (4) obtained from the fertilizer production process to a countercurrent scrubbing (5, 6) and by scru... | 05/05/1987 |
| 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 |
| 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 |
| 4632813 | Process for the production of water soluble ammonium phosphates A process is disclosed for the production of water soluble ammonium phosphates, comprising the following steps: (a) to react in a reaction step ammonia and untreated phosphoric acid with P2 O5 concentration comprised within the range of f... | 12/30/1986 |
| 4610862 | Process for producing purified diammonium phosphate from wet process phosphoric acid A process for producing purified diammonium phosphate (abbreviated to DAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process phosphoric acid with NH3 at 50°~80° C. while keep... | 09/09/1986 |
| 4610853 | Process for producing purified monoammonium phosphate from wet process phosphoric acid A process for producing purified monoammonium phosphate (abbreviated to MAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process phosphoric acid with NH3 at 50°~80° C. while ke... | 09/09/1986 |
| 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 |
| 4565680 | Recovery of phosphorus and aluminum from spent acid from the bright-dip aluminum finishing process In the process of the invention spent phosphoric acid is concentrated and stripped with air to a greater than 50% P2 O5 concentration to remove nitric acid. As a result of concentrating the spent acid a portion of the aluminum precip... | 01/21/1986 |
| 4548798 | Laser synthesis of refractory oxide powders The present invention relates to a method for the production of refractory oxide powders by pyrolyzing with laser energy a metal- and oxygen-containing organic chemical species characterized by the following properties: (a) some or all of the organic frag... | 10/22/1985 |
| 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 |
| 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 |
| 4451277 | Production of fluid 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 lqiuid fertilizer processes. The wastewater replaces water evaporated and the wastewater d... | 05/29/1984 |
| 4442081 | Process for producing a stabilized phosphoric acid A wet process phosphoric acid which has been treated with aluminosilicate after the first stage of clarification can be further stabilized against precipitation of solids during storage and transport and the solids from the crystallizer more economically ... | 04/10/1984 |
| 4420321 | Process for removal of carbon black floc associated with wet-process phosphoric acid in the production of fertilizers Black carbonaceous floc in wet-process phosphoric acid is removed by contact with an oxidizing agent during the neutralization step with ammonia. In an embodiment the black floc is removed in liquid fertilizers derived from wet-process phosphoric acid by ... | 12/13/1983 |
| 4390509 | Process for manufacturing ammonium phosphate utilizing an oxalic acid acidulating process A process for the manufacture of phosphoric acid from phosphate rock is provided. The phosphate rock is digested or acidulated with an acid solution containing oxalic acid to produce phosphoric acid and calcium oxalate. Useful by-products are also formed ... | 06/28/1983 |
| 4383847 | Production of fluid fertilizer from phosphorus furnace waste stream A process and product of waste recovery at phosphorus furnaces is disclosed wherein small sized discrete particles of carbonaceous material or beneficiated phosphate ore are mixed with a mineral axis, an alkaline fluid and water, and the reacted mixture i... | 05/17/1983 |
| 4377406 | Ammonium polyphosphate sulfate fertilizers from wet-process phosphoric acid A process for the production of fluid fertilizers (suspensions and/or solution type) made from merchant-grade phosphoric acid (50-58 percent P2 O5), sulfuric acid, liquid anhydrous ammonia, and water, wherein liquid ammonia is heated... | 03/22/1983 |
| 4375980 | Production of suspension fertilizers from orthophorphoric acid An improved process for the production of concentrated, high-grade, nitrogen-phosphate (N--P2 O5) base suspension fertilizer from wet-process or other phosphoric acids and ammonia. The process involves addition of small proportions o... | 03/08/1983 |
| 4370304 | Two-phase spraying device and reaction chamber for the preparation of a product containing ammonium orthophosphate Ammonium orthophosphate products are prepared by reacting ammonia and phosphoric acid together at high speed under vigorous mixing conditions by spraying the reactants through a two-phase, dual coaxial mixer/sprayer and separately controlling the supply a... | 01/25/1983 |
| 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 |
| 4329326 | Process for preparing crystalline ammonium dihydrogen phosphate A process for preparing crystalline ammonium dihydrogen phosphate, comprises the steps of (a) adding a sequestering agent into ammonium hydrogen phosphate aqueous solution, the sequestering agent reacting with metallic ions contained in the aqueous soluti... | 05/11/1982 |
| 4325927 | Purified monoammonium phosphate process A method of producing purified monoammonium phosphate from wet process phosphoric acid and ammonia is provided. The ammoniation takes place in two stages, the acid being ammoniated in the first stage to a pH between about 1.5 and 2.5. This mixture is allo... | 04/20/1982 |
| 4313918 | Process and device for the preparation of a product containing ammonium orthophosphate, and product obtained by this process Ammonium orthophosphate products are prepared by reacting ammonia and phosphoric acid together at high speed under vigorous mixing conditions by spraying the reactants through a two-phase, dual coaxial mixer/sprayer and separately controlling the supply a... | 02/02/1982 |
