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| Number | Title | Issue Date |
| 7517514 | Process for treating residue of organic material A process for treating organic material, separating calcium and recovering phosphorus and to utilization of the obtained products and their use as a soil conditioner and a fertilizer as well as for providing carbon dioxide traps in gas cleaning. In the process, orga... | 04/14/2009 |
| 7470414 | High purity phosphoric acid and process of producing the same High purity phosphoric acid having an Sb content of 200 ppb or less and a sulfide ion content of 200 ppb or less as impurity contents on a 85 weight percent H3PO4 basis. The high purity phosphoric acid is useful as an etching solution for semic... | 12/30/2008 |
| 7378070 | Phosphorous pentoxide producing methods A phosphorous pentoxide producing method includes forming a kiln bed using feed agglomerates with a calcium-to-silica mole ratio of less than 1.0 and maintaining a bed temperature at or above 1180° C. along at least 50% of the bed length without exceeding 1380° C.... | 05/27/2008 |
| 7166264 | Processes for purifying phosphoric acid and for preparing phosphoric acid A process for purifying phosphoric acid includes removing volatile components from phosphoric acid rich in impurities to form a crude phosphoric acid liquid substantially free of volatile components; heating the crude phosphoric acid liquid to a temperature above 25... | 01/23/2007 |
| 7083768 | Processes for purifying phosphoric acid and for preparing phosphoric acid A process for purifying phosphoric acid includes removing volatile components from phosphoric acid rich in impurities to form a crude phosphoric acid liquid substantially free of volatile components; heating the crude phosphoric acid liquid to a temperature above 25... | 08/01/2006 |
| 7070747 | Process of eluting and recovering phosphorus from sludge In a process of eluting phosphorus from sludge into a liquid phase and recovering the phosphorus efficiently, cell walls of microorganisms in the sludge are ruptured by a process selected from crushing sludge (for example, treating with an ultrasonic wave homogenize... | 07/04/2006 |
| 6925812 | Rotary injector A radially-extending arm is adapted to rotate within a stream of first fluid flowing thereacross. In one embodiment, the arm comprises a plurality of lands located at different radial distances from the axis of rotation, and a port located on each land is operativel... | 08/09/2005 |
| 6921520 | Process for upgrading raw phosphate ore The present invention is a process for upgrading feedstock prepared from raw phosphate ore. Phosphorus sludge is burned to produce impure phosphoric acid and the acid is combined with beneficiated phosphate ore to prepare anhydrous monocalcium phosphate. Feedstock p... | 07/26/2005 |
| 6861039 | Method for purification of phosphoric acid high purity polyphosphoric acid The present invention provides a purification method of phosphoric acid, which includes bringing phosphoric acid containing arsenic into contact with hydrogen halide, thereby to remove the arsenic from the phosphoric acid, and a purification method of phosphoric aci... | 03/01/2005 |
| 6814949 | Process for production of phosphoric acid by crystallization of phosphoric acid hemihydrate The invention relates to a process for producing simultaneously food-grade and fodder-grade phosphoric acid by crystallizing phosphoric acid hemihydrate, H3PO4×0.5H2O, from a prepurified feed acid, which is purified and crystallized... | 11/09/2004 |
| 6540969 | Preparation of hexafluorophosphoric acid The present invention provides a process for preparing hexafluorophosphoric acid complexed with about 1 to 3.3 molecules of water which are stable at temperatures below 20° C. and the compositions prepared thereby.... | 04/01/2003 |
| 6391149 | Method and apparatus for concentrating a solute in solution with a solvent The present invention provides a method, and an apparatus, for forming a prescribed concentration of a substance in a mixture with a fluid, from a comparatively dilute mixture. The mixture is most preferably a solution of a solute in a solvent. The follow... | 05/21/2002 |
| 6153552 | Methods for making catalysts Catalysts that are useful for hydrocarbon conversions and oxygenate conversions, and a method for making such catalysts. The method for making the catalysts comprises forming a mixture comprising molecular sieves comprising pores having a diameter smaller... | 11/28/2000 |
| 6002065 | Kits for preparing calcium phosphate minerals Setting times of calcium phosphate cement compositions are enhanced by the addition of phosphate or carbonate lubricant compositions. Methods for preparing the cement compositions are provided.... | 12/14/1999 |
| 5820632 | Prepared calcium phosphate composition and method Setting times of calcium phosphate cement compositions are enhanced by the addition of phosphate or carbonate lubricant compositions. Methods for preparing the cement compositions are provided.... | 10/13/1998 |
| 5580623 | Storage stable partially neutralized acid compositions and uses Methods and compositions are provided for preparing storage stable partially neutralized acid compositions. The partially neutralized acid compositions are amenable to prolonged periods of storage. Following storage, the acids can be neutralized with a ca... | 12/03/1996 |
| 5368741 | Treatment of aqueous phosphorus wastes Aqueous phosphorus wastes from the electric furnace production of phosphors and containing heavy metal bearing particulates are treated with lime whereby the phosphorus is converted into useful phosphorus compounds and the heavy metals rendered sufficient... | 11/29/1994 |
| 5368832 | Zero discharge process for manufacturing of phosphorous acid and hypophosphorous acid Disclosed is a method of making phosphorous acid or hypophosphorous acid by reacting hydrogen chloride with a sodium phosphite or a sodium hypophosphite, respectively, in the presence of water to precipitate sodium chloride crystals and form the acid. The... | 11/29/1994 |
| 5336264 | Situ prepared calcium phosphate composition and method Setting times of calcium phosphate cement compositions are enhanced by the addition of phosphate or carbonate lubricant compositions. Methods for preparing the cement compositions are provided.... | 08/09/1994 |
| 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 |
| 5208000 | Hydrolysis of phosphorus trichloride There is disclosed a process for the controlled hydrolysis of phosphorus trichloride which avoids the formation of lower oxides of phosphorus, phophines and diphosphines wherein phosphorus pentachloride is added to the phosphorus trichloride from about 20... | 05/04/1993 |
| 5106601 | Process for the removal of acid forming gases from exhaust gases and production of phosphoric acid Exhaust gases are treated to remove NO or NOx and SO2 by contacting the gases with an aqueous emulsion or suspension of yellow phosphorous preferably in a wet scrubber. The addition of yellow phosphorous in the system induces the pro... | 04/21/1992 |
| 4980142 | Preparation of phosphorous acid Phosphorous acid is formed by gaseous phase oxidation of phosphorus with water vapour to form predominantly P2 O3 and dissolving the P2 O3 so-formed in water. The P2 O3 also can be recovere... | 12/25/1990 |
| 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 |
| 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 |
| 4874593 | Conversion of pyrophoric P4 -containing material to P2 O5 material A process for treating a pyrophoric P4 -containing material to convert it to a substantially non-pyrophoric P2 O5 material is described. The process comprises supplying streams of fluid P4 -containing material a... | 10/17/1989 |
| 4834960 | Process for purifying phosphorous acid The purification of phosphorous acid which is formed in halogenations of hydrocarbon derivatives using phosphorus trihalides is carried out in the context of preparing phosphorous acid in a reaction zone by reacting a mixture of phosphorus trichloride and... | 05/30/1989 |
| 4780294 | Process for making crude phosphoric acid Crude phosphoric acid is made by subjecting crude phosphate ore containing sulfide to processing treatment with a mineral acid in a closed system comprised of a processing reactor, a filtering zone and an off-gas scrubbing zone. To this end, a soluble com... | 10/25/1988 |
| 4713228 | Heat recovery in the manufacture of phosphorus acids Heat is recovered from the phosphorus combustion chamber of a furnace phosphoric acid plant by placing in the combustion chamber a heat exchange surface having a protective meta acid coating thereon. Pressurized water can be used as a heat exchange fluid.... | 12/15/1987 |
| 4698216 | Production of an aqueous phosphoric acid solution Aqueous phorphoric acid solutions are produced by contacting an elemental phosphorus-containing material with an oxygen-containing gas, while both are finely divided and well mixed together in a reactor vessel, while the phosphorus-containing material is ... | 10/06/1987 |
| 4692323 | Process for separation of magnesium-based, and possibly fluorine-and aluminum-based impurities from a wet-produced phosphoric acid The invention concerns a process for separating magnesium-based impurities contained in a wet-process produced phosphoric acid. This process comprises adding an ammonium compound R(NH4) soluble in the said phosphoric acid, and, where called for... | 09/08/1987 |
| 4686094 | Treatment of pyrophoric elemental phosphorus-containing material Pyrophoric elemental phosphorus-containing material, e.g., solid waste containing high levels of elemental phosphorus (P4), is treated by contact with an oxygen-containing gas, such as air, to reduce the amount of elemental phosphorus contained... | 08/11/1987 |
| 4684512 | Phosphate recovery from wet phosphoric acid purification process The invention is a process for recovering phosphorus value from magnesium pyrophosphate containing filter media in the wet superphosphoric acid purification process. The invention comprises treating the filter cake with a salt to remove the adhering phosp... | 08/04/1987 |
| 4649035 | Production of phosphorus and phosphoric acid Processes are disclosed for recovering solid wastes containing elemental phosphorus. The wastes may cause serious environmental problems at phosphorus furnaces because elemental phosphorus is toxic to marine animals. Recovery of the wastes was considered ... | 03/10/1987 |
| 4639359 | Process of removing cationic impurities from wet process phosphoric acid A method of removing aluminum, magnesium, iron and other impurities from wet process phosphoric acid is provided. The method comprises partially ammoniating the acid and reacting the acid with a fluoride ion donating compound to precipitate aluminum- and ... | 01/27/1987 |
| 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 |
| 4632814 | Process for stabilizing phosphoric acid An improved process for stabilizing wet process phosphoric acid is described in which the acid is treated with pressurized carbon dioxide and then is aged so as to enhance the rate of post-precipitation.... | 12/30/1986 |
| 4619819 | Phosphoric acid composition 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... | 10/28/1986 |
| 4603039 | Process for making phosphorus pentoxide and optionally phosphoric acid with utilization of the reaction heat The disclosure relates to a process for making phosphorus pentoxide by subjecting elemental yellow phosphorus to combustion with dried air inside a steel-made combustion chamber with utilization of the reaction heat for the production of energy. To this e... | 07/29/1986 |
| 4554144 | Removal of magnesium and/or aluminum values from impure aqueous phosphoric acid Magnesium and aluminum impurities are removed from aqueous phosphoric acid by treatment with a fluorine material and an alkali metal containing material in such a manner that the atomic ratio of fluorine to aluminum is adjusted so that it is greater than ... | 11/19/1985 |
