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| Number | Title | Issue Date |
| 8017100 | Conversion of urea to reactants for NOreduction The invention provides a system for converting urea into reactants useful for removing NOX from industrial emissions. The system includes a urea inlet, a steam inlet, and a reactor in fluid communication with the urea inlet and the steam inlet. The reacto... | 09/13/2011 |
| 7371313 | On-site generation, purification, and distribution of ultra-pure anhydrous ammonia A system and method for generating, purifying, and using ultra-pure ammonia on-site, such as at a semiconductor manufacturing facility. The system includes an ammonia generation system configured to generate ammonia including carbon dioxide, water, and other impurit... | 05/13/2008 |
| 7275366 | High thermal efficiency Selective Catalytic Reduction (SCR) system An emissions control system utilizes otherwise wasted heat to efficiently reduce emissions in a main exhaust flow. Heat stored in exhaust from an auxiliary generator (i.e., auxiliary exhaust) may be used to convert urea to ammonia used by a Selective Catalytic Reduc... | 10/02/2007 |
| 7220395 | Methods for the production of ammonia from urea and/or biuret, and uses for NOand/or particulate matter removal This patent describes technology for generating ammonia from urea. The method is based on the hydrolysis of an aqueous solution of urea and/or biuret by heating under pressure to form a mixture of ammonia, carbon dioxide and water. The gas mixtures produced are usef... | 05/22/2007 |
| 7140187 | Urea based composition and system for same A method and apparatus for generating energy from a composition comprising urea and water are described. The method in one embodiment includes: (a) reacting the urea with water to form ammonia; and (b) oxidizing the ammonia formed in step (a) to form water and nitro... | 11/28/2006 |
| 7033560 | Single source mixtures of metal siloxides This invention pertains to complex mixtures of the formula M is a metal having a valence of from 2–6, L1 is an anionic ligand and L2 is a siloxide or silyl amide ligand suited for producing stable thin-film metal silicates, v is equal to the valence of the metal, ... | 04/25/2006 |
| 7008603 | Process and apparatus for quantitatively converting urea to ammonia on demand Processes and apparatus for quantitatively converting urea to ammonia on demand are disclosed. One process includes the steps of: receiving a demand rate signal for ammonia; feeding reactants including urea and water into a reactor to provide a reaction mixture; and... | 03/07/2006 |
| 6896772 | Method for separating ammonia from solutions containing caprolactam and ammonia A process for distillative removal of ammonia from solutions (I) which include a lactam and ammonia comprises effecting said removal in a distillation apparatus (a) at an absolute pressure of less than 10 bar. ... | 05/24/2005 |
| 6887449 | Method of quantitatively producing ammonia from urea Methods and apparatus for continuously, quantitatively producing gaseous ammonia from urea, including the steps of: dissolving urea in water to form concentrated aqueous urea comprising at least 77 wt. % urea; continuously feeding the concentrated aqueous urea into ... | 05/03/2005 |
| 6761868 | Process for quantitatively converting urea to ammonia on demand Processes and apparatus for quantitatively converting urea to ammonia on demand are disclosed. One process includes the steps of: receiving a demand rate signal for ammonia; feeding reactants including urea and water into a reactor to provide a reaction mixture; and... | 07/13/2004 |
| 6759021 | Method and device for introducing a gaseous reducing agent of a nitrogen oxide into a gas mixture A method for introducing at least one gaseous reducing agent for a nitrogen oxide into a gas mixture, and a device for carrying out the method. Thermal energy is supplied to a body made from a starting material of the reducing agent, so as to form the reducing agent... | 07/06/2004 |
| 6730280 | Methods for the production of ammonia from urea and/or biuret, and uses for NOx and/or particulate matter removal This patent describes technology for generating ammonia from urea. The method is based on the hydrolysis of an aqueous solution of urea and/or biuret by heating under pressure to form a mixture of ammonia, carbon dioxide and water. The gas mixtures produced are usef... | 05/04/2004 |
| 6511644 | Method for removing contaminants in reactors The invention provides a method and apparatus for maintaining the operation of reactors by removing contaminant matter arising from the solid reactant(s) used as a feedstock in such systems, by either intermittent or continuous means.... | 01/28/2003 |
| 6506350 | Method using on site generated ammonia to reduce particulates in combustion gas streams This patent describes technology for generating ammonia from urea. The method is based on the hydrolysis of an aqueous solution of urea and/or biuret by heating under pressure to form a mixture of ammonia, carbon dioxide and water. The gas mixtures produc... | 01/14/2003 |
| 6471927 | Process for converting urea into ammonia A microwave hydrolysis reactor for converting urea into ammonia has one or more reaction chambers into which a urea solution is fed via a feed device and a discharge device for discharging an ammonia-water mixture. A catalytic converter is arranged in the... | 10/29/2002 |
| 6436359 | Method for controlling the production of ammonia from urea for NOx scrubbing A process to provide a pressurized gas stream useful for removing nitrogen oxides from a combustion gas stream by hydrolyzing urea in aqueous solution in a closed reactor to evolve gaseous ammonia at a rate essentially balanced to the amount required from... | 08/20/2002 |
| 6322762 | Method using on site generated ammonia to reduce particulates This patent describes technology for generating ammonia from urea. The method is based on the hydrolysis of an aqueous solution of urea and/or biuret by heating under pressure to form a mixture of ammonia, carbon dioxide and water. The gas mixtures produc... | 11/27/2001 |
| 6117407 | Method for the generation of ammonia A method for the generation of ammonia from dinitrogen is provided including reacting a three coordinate, low oxidation state transition metal complex with dinitrogen under substantially atmospheric pressures to obtain a metal-nitrido complex, whereby the... | 09/12/2000 |
| 6093380 | Method and apparatus for pollution control in exhaust gas streams from fossil fuel burning facilities This invention relates to pollution control requirements for fossil-fuel burning facilities, such as power plants, and, more particularly, to a method for providing a safe and economical supply of ammonia, from a urea feedstock, when ammonia is desired or... | 07/25/2000 |
| 6077491 | Methods for the production of ammonia from urea and/or biuret, and uses for NOx and/or particulate matter removal This patent describes technology for generating ammonia from urea. The method is based on the hydrolysis of an aqueous solution of urea and/or biuret by heating under pressure to form a mixture of ammonia, carbon dioxide and water. The gas mixtures produc... | 06/20/2000 |
| 6071614 | Microporous fluorinated silica agglomerate and method of preparing and using same Microporous fluorinated silica agglomerates are disclosed and their method of preparation from a reaction of colloidal silica of small particle sizes with an alkylamine (or a hindered amine) and hydrofluoric acid or with alkylammonium fluoride, under conv... | 06/06/2000 |
| 5985224 | Process for ammonia production through urea hydrolysis An improved process for combustion flue gas conditioning in which ammonia is injected into a stream of said combustion flue gas, wherein urea is dissolved in water, forming a dissolved urea solution. The dissolved urea solution is heated and pressurized a... | 11/16/1999 |
| 5827490 | Method for converting urea to ammonia A method for reducing NOx in a combustion exhaust gas stream from a boiler. The method includes the steps of converting an aqueous solution of urea to ammonia by heating the urea solution to a temperature of 350°-650° F. The urea solution is ... | 10/27/1998 |
| 5616163 | Method for processing animal excrement and liquid manure Method for the processing of animal excrements and liquid manure--called liquid materials--for the purpose of utilization of the ammonia contained in the liquid materials as a chemically bound non fugitive plant fertilizer, as well as the thermal disposal... | 04/01/1997 |
| 5514358 | Method for the synthesis of chemical compounds Methods for synthesis of chemical compounds by catalytic transfer hydrogenation comprise forming a mixture of a starting material, a hydrogen donor material and a catalyst. The catalyst is selected from a catalytic form of carbon, a polyethylene glycol ph... | 05/07/1996 |
| 5399755 | Process and equipment for the hydrolysis of residual urea in the water from synthesis plants Process for the hydrolysis of urea contained in the process water from plants for the synthesis of urea consisting of the thermic treatment of the water containing urea and of the removal by stripping of the compounds from decomposition of the urea (CO | 03/21/1995 |
| 5252308 | Transporting urea for quantitative conversion into ammonia High purity ammonia is quantitatively produced from urea by reaction with water in the presence of acid. A major advantage of the invention is that urea can be safely transported to a conversion site, then converted to ammonia. The net result is that high... | 10/12/1993 |
| 5240688 | Process for the in-line hydrolysis of urea The present invention relates to a process for the in-line hydrolysis of urea. More particularly, the process involves heating an aqueous solution of urea while flowing through a conduit to a temperature and for a time effective to hydrolyze urea to produ... | 08/31/1993 |
| 4906447 | Synthetic ammonia process The synthesis of ammonia from hydrogen and nitrogen is carried out in a process scheme in which a liquid material is provided to react with ammonia to form an ammine to either improve the method of recovery of ammonia from a product gas stream or to upset... | 03/06/1990 |
| 4652678 | Process for the recovery of valuable components from the waste streams obtained in the preparation of urea An improved process for recovering usable components from waste streams containing urea, including a dilute aqueous urea solution, which result from the preparation of particulate urea products. The dilute aqueous urea solution is used to wash a urea cont... | 03/24/1987 |
| 4468376 | Disposal process for halogenated organic material A method for disposing of a halogenated organic material includes the steps of partially oxidizing the halogenated organic material, a hydrocarbonaceous material, and a nitrogen compound with a free-oxygen containing gas and optionally with a temperature ... | 08/28/1984 |
| 4450112 | Process for converting nitriles to carboxylic esters Reaction of a nitrile, an alcohol and water in the presence of a catalyst comprising rhodium, iridium or platinum complexed with hydroxo and tertiary phosphine moieties, to produce the corresponding carboxylic ester.... | 05/22/1984 |
| 4342735 | Stripping of aqueous ammonium carbonate solution In stripping ammonia and carbon dioxide from an aqueous ammonium carbonate solution including organic ammonium salts, inorganic base is introduced into the column at a point below the point of the feed introduction and above the column bottom to liberate ... | 08/03/1982 |
| 4308385 | Process for purifying urea-containing waste water and process for preparing melamine An improved process for the removal of urea from urea-containing waste water by hydrolysis and desorption of the ammonia and carbon dioxide thus formed. Urea-containing waste water is treated in a process for the separation of ammonia and carbon dioxide f... | 12/29/1981 |
| 4220635 | Catalytic method for hydrolyzing urea A method for hydrolyzing urea in aqueous solutions such as waste-water streams which comprises heating the aqueous solution containing urea in the presence of a catalytic amount of a vanadium compound for sufficient time and at sufficient temperatures to ... | 09/02/1980 |
| 4168299 | Catalytic method for hydrolyzing urea A method for hydrolyzing urea in aqueous solutions such as waste-water streams which comprises heating the aqueous solution containing urea in the presence of a catalytic amount of vanadium pentoxide for sufficient time and at sufficient temperatures to e... | 09/18/1979 |
| 4156697 | Production of alkylphosphines Alkyl phosphines of the general formula: are made. To this end hydrogen phosphide, a primary or a secondary phosphine is reacted with an alkylamine of the general formula: in a molar ratio of 0.1 to 10 mols of the alkylamine of formula II per mol of hydrogen p... | 05/29/1979 |
| 4148614 | Process for removing sulfur from coal A process for decreasing the sulfur content of coal is provided, which includes forming a slurry of coal particles in an inert solvent, and subjecting the slurry in admixture with hydrogen to the influence of wave energy in the microwave range.... | 04/10/1979 |
| 4148865 | Treatment of cyanide byproduct in nitrile production Hydrogen cyanide, carbon dioxide and ammonia present in a nitrile production effluent are recovered as an aqueous solution containing ammonium carbonate and ammonium cyanide. The cyanide is hydrolyzed to ammonia and carbon monoxide, followed by recovery o... | 04/10/1979 |
| 4123230 | Sulfur removal from coal A process for decreasing the sulfur content of coal is provided, which includes drying coal and subjecting the dried coal in a hydrogen atmosphere to the influence of wave energy in the microwave range.... | 10/31/1978 |
