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| Number | Title | Issue Date |
| 7820125 | Phosphorus effusion cell arrangement and method for producing molecular phosphorus The phosphorus effusion cell arrangement according to the present invention comprises a first vacuum container for red phosphorus, a second vacuum container for white phosphorus, said first and second vacuum containers being interconnected, means for providing vacuu... | 10/26/2010 |
| 7182872 | Struvite crystallization The present invention provides a method and apparatus for removing phosphorus from phosphorus containing waste. In one embodiment, the method is preferably carried out by contacting the phosphorus containing waste with a non-cellular membrane and precipitating phosp... | 02/27/2007 |
| 7147780 | Process for reducing sludge derived from the treatment of wastewater by oxygenation and mechanical action A method for reducing the production of sludge derived from the treatment of wastewater. The sludge is subjected to a mechanical action in the presence of a gas containing oxygen. The mechanical action is performed in such a way as to destroy the cell walls of betwe... | 12/12/2006 |
| 6955796 | Process for total environmental remediation of a phosphorus contaminated site A process is disclosed for recovering elemental phosphorus from an aqueous sludge and converting the residue into non-hazardous waste. The sludge is separated into (1) a slurry of water containing suspended phosphorus and dirt particles and (2) coarse solids. A floc... | 10/18/2005 |
| 6680130 | High K dielectric material and method of making a high K dielectric material A dielectric material having a high dielectric constant includes a Group III metal oxide and a Group V element. The incorporation of the Group V element in the Group III metal oxide material reduces the number of structural defects in the dielectric mater... | 01/20/2004 |
| 6645625 | Stabilized red phosphorus material and a process for its preparation The invention relates to a stabilized, pulverulent red phosphorus material composed of phosphorus particles whose particle size is not more than 2 mm, and whose surface has been covered with a thin layer of an oxidation stabilizer, wherein the oxidation s... | 11/11/2003 |
| 6620396 | Method of removing phosphorus from sludge A method of recovering elementary phosphorus from an aqueous sludge containing about 1 to about 15 wt % dispersed particles of phosphorus is disclosed. To the sludge is added about 1 to about 20 wt %, based on the weight of the phosphorus present in said ... | 09/16/2003 |
| 6592831 | Vaporization and cracker cell method and apparatus A method and apparatus for vaporizing and cracking chemical elements for use in a deposition process. The apparatus includes a vaporization cell integrally connected with a thermal cracker cell. The vaporization cell has an inlet section in communication ... | 07/15/2003 |
| 6451276 | Recovery of elemental phosphorus from phosphorus sludge Disclosed is a method of recovering elemental phosphorus from a sludge that contains water, dirt, and elemental phosphorus. In the first step, the sludge is melted. A mixture is formed of the melted sludge and about 0.5 to about 5 wt % of an oxidizing age... | 09/17/2002 |
| 6277780 | Preparation of phosphorus-treated activated carbon composition Disclosed is a method for preparing a phosphorus treated activated carbon composition suitable for use as a catalyst support, a catalyst, and an adsorbent. The invention method involves treating (e., mixing or impregnating) an activated carbon material ha... | 08/21/2001 |
| 6180235 | Phosphorus-containing iron powders Phosphorus-containing iron powder is prepared by mixing carbonyl iron powder or whiskers with elemental phosphorus, heating the mixture and comminuting the product obtained to give a powder. The powder of the present invention has a particularly low conte... | 01/30/2001 |
| 6169222 | Remediation of soil polluted with phosphorus-containing wastes Elemental phosphorus was produced by the Tennessee Valley Authority (TVA) at Muscle Shoals, Ala. by smelting phosphatic material with carbon in electric furnaces. Solid wastes containing elemental phosphorus accumulated at the production facility as a res... | 01/02/2001 |
| 6146610 | Process for removal of arsenic from elemental phosphorus Arsenic is removed from elemental phosphorus by treating it with an oxidized form of iodine in a sufficient amount and for a sufficient time to obtain the amount of arsenic reduction desired. When iodine is the source of the oxidized iodine an oxidant is ... | 11/14/2000 |
| 6110438 | Method of making black phosphorus from red phosphorus The specification describes a method for producing black phosphorus from red phosphorus by thermally cycling red phosphorus in a vacuum between 360-400° C. and 200-240° C., whereupon the red phosphorous undergoes an allotropic phase change to black phos... | 08/29/2000 |
| 6051201 | Preparation of phosphatic feedstock from phosphorus-containing waste Phosphorus furnaces were operated by the Tennessee Valley Authority (TVA) to produce elemental phosphorus beginning over the period 1936-1976. Elemental phosphorus was lost in phosphorus-containing waste throughout the 40 years TVA produced the element. L... | 04/18/2000 |
| 6022514 | Method for recovering phosphorus from organic sludge A method for recovering phosphorus from organic sludge includes the steps of producing incinerated ash from organic sludge, mixing the incinerated ash with a carbon source, vaporizing phosphorus from phosphorus compounds in the incinerated ash by heating ... | 02/08/2000 |
| 5989509 | Method for extracting antimony from elemental phosphorous A process for purifying elemental phosphorus that contains antimony using an oxidizer, such as hydrogen peroxide, peroxymonosulfate, peroxydisulfate, or a hypochlorite, in a two phase system containing water and phosphorus as the two liquids. A purified e... | 11/23/1999 |
| 5670126 | Method for extracting antimony from elemental phosphorus A process for purifying elemental phosphorus, by dosing a multi-phase elemental phosphorus system, having an aqueous phase and an immiscible, elemental phosphorus phase containing antimony, with a conditioning agent selected from the group consisting of i... | 09/23/1997 |
| 5588969 | Method for supplying phosphorous vapor In accordance with the invention, phosphorous vapor is provided by in situ conversion of red phosphorous to white phosphorous and permitting the flow of vapor from said white phosphorous. The conversion is effected in a low pressure cell having a high tem... | 12/31/1996 |
| 5549878 | Processes for the disposal and recovery of phossy water Phossy water is a toxic liquid waste that is generated when elemental phosphorus is manufactured, stored, or processed into phosphorus-containing products. Elemental phosphorus may be prsent as a solution, as colloidal particles, and as settleable particl... | 08/27/1996 |
| 5543444 | Red phosphorus flame retardant and nonflammable resinous composition Disclosed is a red phosphorus flame retardant comprising a fine red phosphorus powder subjected to a surface modification treatment, said fine red phosphorus powder consisting of spherical red phosphorus particles and/or agglomerates thereof directly obta... | 08/06/1996 |
| 5538702 | Gas stream purification apparatus A method for the treatment of a stream of exhaust gases including phosphine in which the stream is heated to a sufficiently high temperature to decompose the phosphine to phosphorus vapor and the stream is then passed into a reactor containing calcium oxi... | 07/23/1996 |
| 5514352 | Apparatus for high speed air oxidation of elemental phosphorous wastes in aqueous medium Apparatus and process for high speed air dispersion (HSAD) and oxidation of elemental phosphorus in aqueous medium. The HSAD apparatus is an element used in a process designed for treating the highly toxic and hazardous phosphorus sludge wastes with oxyge... | 05/07/1996 |
| 5310530 | Method for decreasing the sulfur content of phosphorous A method for purifying phosphorus to insure a low sulfur content involves intensively mixing phosphorus and concentrated sulfuric acid to form an emulsion, breaking the emulsion by contact with water or dilute sulfuric acid, and then immediately separatin... | 05/10/1994 |
| 5296212 | Method for the removal of sulfur from phosphorus A method for purifying white phosphorus contaminated with sulfur bound thereto involves contacting contaminated white phosphorus with water, steam, aqueous solutions, or vaporized aqueous solutions, preferably alkaline, to remove bound sulfur from the pho... | 03/22/1994 |
| 5292494 | Process for production of red phosphorous powder A process for the production of a red phosphorus powder, which comprises heating a yellow phosphorus at the boiling point therof in the presence of a dispersant selected from the group of a surfactant, a sparingly in water, finely powdered inorganic compo... | 03/08/1994 |
| 5283042 | Process for the purification of white phosphorus Impure white phosphorus values are purified to such extent as to be useful, e.g., for the preparation of P4 S10 therefrom, by (a) reacting liquid, impure white phosphorus with an aqueous suspension of a purifying amount of active cha... | 02/01/1994 |
| 5270370 | Red phosphorus Evolution of phosphine from red phosphorus is reduced by means of acyclic, aliphatic compounds having at least one carbon-to-carbon double bond, in the alpha-position relative to an electron-withdrawing group. A preferred example of such a compound is tra... | 12/14/1993 |
| 5122359 | Process for reprocessing sulfuric acid from phosphorous purification A process for reprocessing sulfuric acid obtained in the purification of yellow phosphorous, which comprises mixing the contaminated sulfuric acid with hydrogen peroxide and reacting this mixture in a vessel containing hot concentrated sulfuric acid at 11... | 06/16/1992 |
| 5093199 | Stabilized red phosphorus In a stabilized, pulverulent red phosphorus comprising phosphorus particles having a maximum particle size of 2 mm whose surface is covered with a thin layer of an oxidation stabilizer, the oxidation stabilizer is composed of tin oxide hydrate.... | 03/03/1992 |
| 5075088 | Production of red phosphorus Amorphous red phosphorus useful for matches, or as flame retardant is made by forming a slurry of 10-45% red phosphorus in molten white phosphorus, reducing the content of yellow phosphorus to less than 20% of the red phosphorus by separation at less than... | 12/24/1991 |
| 5041490 | Method for producing red phosphorus flame retardant and nonflammable resinous composition Red phosphorus flame retardants for synthetic resin are produced by a method comprising the steps of heating yellow phosphorus at temperatures of 250° to 600° C. to effect a partial conversion of yellow phosphorus to red phosphorus; removing unconverted... | 08/20/1991 |
| 5026757 | Red phosphorus flame retardant and nonflammable resinous composition containing the same A flame retardant comprising of spherical red phosphorus free of pulverized face which is directly produced in the form of fine powder by conversion of yellow phosphorus, without pulverizing process. The red phosphorus characterized by its surface state a... | 06/25/1991 |
| 5002745 | Method of separating and recovering phosphorus from phosphorus sludge A process is described for the separation and recovery of phosphorus from phosphorus-dirt mixtures by adding a quaternary ammonium compound to the mixture, while it is under an aqueous cover, agitating same, and separating a lower phosphorus phase from an... | 03/26/1991 |
| 4985221 | Phlegmatized red phosphorus Phlegmatized, pulverulent red phosphorus with good free-flowing properties comprises 95 to 99.95% by weight of red phosphorus having a particle size of up to 2 mm, and 0.05 to 5% by weight of polyurethane as phlegmatization agent. This red phosphorus is p... | 01/15/1991 |
| 4968499 | Conversion of precipitator dust into phosphorus furnace feedstock A process is disclosed for converting precipitator dust obtained during production of elemental phosphorus into feedstock for the submerged-arc electric furnace. Precipitator dust is agglomerated and indurated to prepare furnace feedstock. A binder is mad... | 11/06/1990 |
| 4961912 | Passivation of elemental phosphorus contained in waste ponds Elemental phosphorus contained in waste ponds can be appropriately passivated to render them substantially less pyrophoric by bringing the elemental phosphorus-containing wastes into contact with an oxygen-containing gas. Substantially pure oxygen can be ... | 10/09/1990 |
| 4902491 | Phosphate feed material for phosphorus electric furnaces and production of same Compacted shapes of phosphatic material, suitable as a charge for a phosphorus furnace, are produced by compacting a mixture of calcined phosphate fines and phosphoric acid. The compacted shapes are conveniently produced on a roll briquetting press.... | 02/20/1990 |
| 4889702 | Process for removing metallic constituents from dust obtained during the electrothermal production of yellow phosphorus Metallic constituents, especially heavy metal constituents are removed from dust electrostatically separated from a gas mixture consisting substantially of carbon monoxide and phosphorus in vapor form obtained during the electrothermal production of yello... | 12/26/1989 |
| 4879067 | Red phosphorus flame retardant and nonflammable resinous composition containing the same A flame retardant comprising of spherical red phosphorus free of pulverized face which is directly produced in the form of fine powder by conversion of yellow phosphorus, without pulverizing process. The red phosphorus characterized by its surface state a... | 11/07/1989 |
