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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 |
| 7204968 | Method of producing heat energy Energy in the form of heat is recoverable and controllable in a process that reacts an acid and a base in the presence of steam. The recovered heat energy can be used to vaporize water to form steam which when used in conjunction with a turbine will produce electric... | 04/17/2007 |
| 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 |
| 7094384 | Combined methane decomposition and ammonia formation cell An ammonia synthesis process and apparatus are provided which are energy efficient and minimize greenhouse-gas-emission during the processing of natural gas and air. In the process a stream of natural gas is divided into two streams, one of which is mixed with air a... | 08/22/2006 |
| 6939521 | Fluoropolymer reactor with heat exchange jacket A reactor for fluorinating an organic compound comprising (a) an outer vessel; (b) a reactor vessel being disposed within said outer vessel to define an annular space, said reactor vessel at least partially comprising a fluoropolymer, said annular space being adapte... | 09/06/2005 |
| 6893494 | Stable metal zirconium phosphates for color applications The invention provides a stable metal zirconium phosphates having formula (I), in which X is a metal or a combination of metals selected from Co, Mn, Ni, Cu, Cd, Fe, Cr, Al, Sn, V, Zn, Sc, Na, Mg, Ca and Si; and n has a molar value in the range of 1.25 to 22. These ... | 05/17/2005 |
| 6565756 | Method for the conditioning of phosphoric acid A method for the conditioning of phosphoric acid containing solutions is described, wherein the solution is converted to a solid material by adding an aluminum compound. This solid material can readily be stored in disposal sites because it is not water-s... | 05/20/2003 |
| 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 |
| 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 |
| 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 |
| 5814292 | Comprehensive energy producing methods for aqueous phase oxidation An aqueous phase oxidization process for the oxidization of any nonoxidized feed material using a mixture of a feed material, an oxidizing acid, such as nitric acid; oxygen gas, water and preferably a stabilizing acid, such as sulfuric acid. The mixture i... | 09/29/1998 |
| 5443808 | Method of producing alkali metal phosphate The invention relates to a method for producing alkali metal phosphate, in particular monopotassium phosphate or its aqueous solution, by reacting fertilizer-grade phosphoric acid with alkali metal chloride at 350° . . . 700° C. to produce alkali metal ... | 08/22/1995 |
| 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 |
| 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 |
| 5124137 | Process for the preparation of alkali metal phosphate solutions Alkali metal phosphate solutions having a fluorine content of less than 20 ppm, based on P2 O5, are prepared by first digesting crude phosphate using sulfuric acid, and separating the calcium sulfate from the crude phosphoric acid. A... | 06/23/1992 |
| 5114460 | Production of low-chloride alkali metal phosphates Potassium phosphate useful as a low-chloride content fertilizer is prepared by reacting phosphoric acid, commercial or technical grade, with fertilizer-grade potassium chloride (Muriate of Potash, 60-63% K2 O) at a reaction temperature of about... | 05/19/1992 |
| 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 |
| 4904459 | Process for working up dusts which are produced in the electrothermal production of phosphorus A process is provided for working up dusts which have been precipitated electrostatically from the gas mixture composed essentially of carbon monoxide and phosphorus vapor produced in the electrothermal production of yellow phosphorus, which process compr... | 02/27/1990 |
| 4853200 | Continuous process for preparing sodium orthophosphate slurries from natural soda ash orthophosphoric acid Unmilled commercially available granular "natural" soda ash is reacted with orthophosphoric acid to produce a highly concentrated slurry at a molar Na:P ratio of about 1.5 in a continuous process. Problems associated with incomplete reaction are solved an... | 08/01/1989 |
| 4836995 | Process for the manufacture of monopotassium phosphate The present invention relates to a process for the manufacture of monopotassium phosphate using solvent extraction technique. According to the invention, the reaction occurs between phosphoric acid and potassium chloride at a temperature between 0 and 100... | 06/06/1989 |
| 4751066 | Process for preparing alkali metal phosphate Alkali metal phosphates are recovered from a water immiscible solvent solution of aqueous wet process phosphoric acid by neutralizing the acid with a basic alkali metal salt in a ratio of alkali metal to phosphorus of 1 to 3.5 to form at least the mono al... | 06/14/1988 |
| 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 |
| 4720598 | Process for preparing a basic lithium phosphate catalyst for the isomerization of alkene oxides Process for preparing a basic lithium phosphate catalyst suitable for the gas phase isomerization of an alkene oxide to the corresponding alcohol, in which process an aqueous solution of a lithium compound is mixed in the presence of an alkali metal hydro... | 01/19/1988 |
| 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 |
| 4676963 | Manufacture of sodium tripolyphosphate from wet acid A process is described for converting wet acid into sodium tripolyphosphate by pretreating the wet acid in a pretreatment stage with a sodium source and SiO2 to precipitate fluoride values from the wet acid, solvent extracting the pretreated we... | 06/30/1987 |
| 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 |
| 4661331 | Continuous process for preparing sodium orthophosphate slurries from natural soda ash and orthophosphoric acid Unmilled commercially available granular "natural" soda ash is reacted with orthophosphoric acid to produce a highly concentrated slurry at a molar Na:P ratio of about 1.5 in a continuous process. Problems associated with incomplete reaction are solved an... | 04/28/1987 |
| 4640824 | Process for making alkali metal phosphate solutions containing little fluorine The disclosure relates to a process for making alkali metal phosphate solutions containing little fluorine from pre-purified alkali metal phosphate solutions obtained from crude phosphoric acid by extracting the acid with an organic solvent being immiscib... | 02/03/1987 |
| 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 |
| 4632812 | Process for making alkali metal phosphate solutions containing little vanadium Alkali metal phosphate solutions containing little vanadium are made from phosphoric acid containing vanadium. To this end, a negative redox potential is established in the phosphoric acid by addition of a reductant, the acid is partially neutralized and ... | 12/30/1986 |
| 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 |
| 4596703 | Process for purifying wet-processed phosphoric acid The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides: (a) for the organic solvent to be mixed with the starting product in a ratio by volume of more than 4:1 to effect the ext... | 06/24/1986 |
| 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 |
| 4556548 | Process for purifying wet-processed phosphoric acid The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides: (a) for the organic solvent to be mixed with the starting product in a ratio by volume of more than 4:1 to effect in a si... | 12/03/1985 |
| 4540557 | Process for reducing the fluorine content in wet-processed phosphoric acid The disclosure relates to a process for reducing the fluorine content in wet-processed phosphoric acid. To this end, the disclosure provides for an acid extract in an organic solvent to be treated with an at least 45 weight % suspension of aluminum hydrox... | 09/10/1985 |
| 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 |
| 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 |
