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| Number | Title | Issue Date |
| 7442352 | Flue gas purification process using a sorbent polymer composite material Process for removing sulfur oxides, mercury vapor, and fine particulate matters from industrial flue gases that contain such pollutants. Pollutants are removed by modules, which contain microporous adsorbent (i.e., sorbent) material held within a polymer matrix. The... | 10/28/2008 |
| 7416716 | Purification of carbon dioxide SO2 and/or NOx are removed from gaseous CO2 at elevated pressure(s) in the presence of molecular oxygen and water and, when SO2 is to be removed, NOx, to convert SO2 to sulfuric acid and/or NOx | 08/26/2008 |
| 7404938 | Emission control system Methods and apparatus utilizing hydrogen peroxide are useful to reduce NOx, SOx and mercury (or other heavy metal) emissions from combustion flue gas streams. Continuous concentration of hydrogen peroxide to levels approaching or exceeding propellant-grade hydrogen ... | 07/29/2008 |
| 7364711 | Method for removing NO during the production of nitric acid N2O is removed in nitric acid manufacture by using catalysts comprising three-dimensional structures coated with catalytically active materials. ... | 04/29/2008 |
| 7118723 | Method for producing nitric acid A process for producing nitric acid of a concentration in the range of 68 to 76% by weight, using the mono-pressure or the dual-pressure process in which the ammonia feedstock is combusted with the aid of compressed process air. The water vapour content of the proce... | 10/10/2006 |
| 7090744 | Process for making composition for conversion to lyocell fiber from sawdust A process for making a composition for conversion to lyocell fiber where the process comprises pulping a raw material in a digester to provide an alkaline pulp, wherein the raw material comprises sawdust in an amount greater than 0 % up to 100 %; and contacting the ... | 08/15/2006 |
| 6737034 | Nitric acid production A method process to convert inhibited red fuming nitric acid (IRFNA) and/or nitrogen tetraoxide to either dilute or concentrated (98%+) nitric acid. The method describes a process to remove all of the normal inhibitors (if required), that have been reported to been ... | 05/18/2004 |
| 6676912 | Method for removal of nitrogen oxides from stationary combustion sources A method for removing NOX from gas streams emanating from stationary combustion sources and manufacturing plants utilizes the injection of hydrogen peroxide into the gas stream for rapid gas-phase oxidation of NO to NO2 and water-sol... | 01/13/2004 |
| 6641638 | Process for nitrogen oxide waste conversion to fertilizer The present invention describes a process for converting vapor streams from sources containing at least one nitrogen-containing oxidizing agent therein to a liquid fertilizer composition comprising the steps of: a) directing a vapor stream containing at le... | 11/04/2003 |
| 6610263 | System and process for removal of pollutants from a gas stream System for removal of targeted pollutants, such as oxides of sulfur, oxides of nitrogen, mercury compounds and ash, from combustion and other industrial process gases and processes utilizing the system. Oxides of manganese are utilized as the primary sorb... | 08/26/2003 |
| 6495112 | Method and apparatus for removing oxygen from natural gas Oxygen is removed from natural gas by contacting oxygen-containing natural gas with nitric oxide under conditions sufficient to produce nitrogen dioxide.... | 12/17/2002 |
| 6395243 | Catalytic or non-catalytic processes with enriched oxygen as a reactant A method is provided for performing catalytic or non-catalytic processes which uses oxygen supplied from the permeate side of a mixed oxygen ion and electron conducting membrane by means of a sweep gas at an elevated temperature. The sweep gas is formed b... | 05/28/2002 |
| 6284212 | Method of nitric acid formation using a catalytic solution Methods for concentrating nitric acid in aqueous solution are known wherein reduction of some nitric acid initially present in the solution oxidizes nitric oxide obtained for example from exhaust vapors of heterogneously catalytically combusted ammonia, b... | 09/04/2001 |
| 6264909 | Nitric acid production and recycle An improved process for either the manufacturing of nitric acid, recycling of nitric acid, or recovering of nitric acid, comprising the steps of: providing a source of NOx ; reacting NO from the source of NOx with HNO3 in ... | 07/24/2001 |
| 6264910 | Process for the production of nitric acid A process for the production of nitric acid using the dual-pressure process in which the ammonia is burnt at an initial low pressure with the aid of compressed process air and the nitrous gases formed during combustion are at least partly absorbed by wate... | 07/24/2001 |
| 6235252 | Method for recovering nitrate ions as nitric acid from nuclear industry effluents A method for recovering nitrate ions as nitric acid from nuclear industry effluents by thermally decomposing the nitrate ions in solution, and recovering the NOx vapors generated by the heat treatment in an aqueous medium. The resulting nitric ... | 05/22/2001 |
| 6231824 | Removal of nitric oxide from gas streams Nitric oxide is removed from a gas stream by contacting the gas stream with oxygen in the presence of a metal-cation exchanged zeolite, thereby oxidizing the nitric oxide to nitrogen dioxide, then contacting the resulting nitrogen dioxide-containing gas s... | 05/15/2001 |
| 6197268 | Reduction of toxic substances in waste gas emissions Nitrogen oxides are removed from a waste gas stream by contacting the waste gas stream with ammonia, thereby reducing the nitrogen oxides to nitrogen. Residual nitrogen oxides and unreacted ammonia in the waste gas stream leaving the nitrogen oxides reduc... | 03/06/2001 |
| 6165435 | Method and production of nitric acid A process is described for producing nitric acid involving oxidizing ammonia gas to form dinitrogen tetroxide gas, reacting the dinitrogen tetroxide with water in an absorption zone to form aqueous nitric acid and nitric oxide gas, removing a nitric acid/... | 12/26/2000 |
| 6162409 | Process for removing Nox and Sox from exhaust gas An exhaust gas stream containing oxides of nitrogen and sulfur from a fossil fuel fired boiler, a fired process heater, or a chemical process are diverted from a stack prior to emission to the atmosphere through a duct system to a mixer where an oxidant, ... | 12/19/2000 |
| 6132692 | Barrier discharge conversion of SO2 and NOx to acids A process for reducing particulate, Hg, NOx, and SO2 emissions from the combustion of fossil fuel while providing the capability of producing an end product that is commercially useful comprising the steps of oxidizing Hg, NOx and SO2 | 10/17/2000 |
| 6056928 | Method of removing nitrogen oxides from a gas flow The invention relates to a process for removing nitrogen oxides from a gas stream containing same, which comprises passing the gas stream (A) through a stage for absorbing the nitrogen oxides other than N2 O in an absorbent or reacting the nitrogen ... | 05/02/2000 |
| 6039783 | Process and equipment for nitrogen oxide waste conversion to fertilizer The present invention describes a process for converting vapor streams from sources containing at least one nitrogen-containing oxidizing agent therein to a liquid fertilizer composition comprising the steps of: a) directing a vapor stream containing at least ... | 03/21/2000 |
| 5985230 | Nitric acid production Provided is a process having an increased production capacity for nitric acid, which moves can be operated safely and efficiently. The process comprises forming a reaction mixtures by mixing air, ammonia, oxygen and an inert cooling fluid, preferably wate... | 11/16/1999 |
| 5980843 | Method and apparatus in catalytic reactions A catalyzer is provided for promoting chemical reactions, such as the reaction between ammonia and air to produce nitrogen monoxide which, in turn, can be used to manufacture nitric acid or the purification of flue gas from incineration plants. The cataly... | 11/09/1999 |
| 5871703 | Barrier discharge conversion of SO2 and NOx to acids A process and apparatus for reducing particulate, nitrogen oxides ("NOx"), sulfur dioxide ("SO2 "), and mercury ("Hg") emissions from the combustion exhaust of fossil fuel fired plants while producing an end product that is commercially useful,... | 02/16/1999 |
| 5366711 | Process for the oxidative purification of waste gases containing nitrogen oxides A process is described for the removal of nitrogen oxides from waste gases with the recovery of nitric acid or a nitrate solution. The waste gas is reacted with hydrogen peroxide in an amount appropriate to the desired degree of removal of nitrogen oxides... | 11/22/1994 |
| 5360603 | Packed bed arrangement useful for mixing and/or oxidation The present invention relates to processes and apparatus for mixing oxidizable reactants with oxidant and/or oxidizing oxidizable reactants. Through using particular mixing and/or oxidizing arrangements, the risk of flammable or explosive reactions can be... | 11/01/1994 |
| 5206002 | Process for removing NOx and SOx from exhaust gas Exhaust gases containing oxides of nitrogen and sulfur from a fired process heater, a fossil fuel fired boiler, or a chemical process are diverted from a stack prior to admission to the atmosphere through a duct system containing heat exchangers that redu... | 04/27/1993 |
| 5154906 | Redox-potential control for hydrogen peroxide in nitric acid A method of maintaining a given content of a substance A in an aqueous solution where it is continuously consumed and where the redox potential E, at least within the range of concentration used, approximately satisfies the equation: E=G+F(x) wherein x is... | 10/13/1992 |
| 5149515 | Process for the production or recovery of acids from metalliferous solutions of such acids During the pickling, etching, chemical shaping etc. of steels, stainless steels, special alloys and special metals and the dissolution of those metals, metalliferous solutions of the acids employed arise in the course of such processes which must either b... | 09/22/1992 |
| 5112587 | Method for the denitration of waste gases with obtention of HNO3 A method for the removal of nitrogen oxides from waste gases and for obtaining nitric acid is described. The waste gas is charged with the required amount of hydrogen peroxide, converted into the gas phase, and the gas mixture is reacted on a solid cataly... | 05/12/1992 |
| 5064625 | Method of removing nitrogen oxides from flue gases In a process for the removal of nitrogen oxides (NOx) from pretreated flue gases having a nitrogen oxide content which is low by means of a multi-stage washing process employing a nitric acid (HNO3) solution to which is added hydroge... | 11/12/1991 |
| 5017348 | Treatment of nitrogen oxides The mixture of aqueous nitric and nitrous acids which is produced by the absorption of nitrogen oxides with water in the manufacture of nitric acid is conducted to a closed vessel, where the acid mixture is reacted with oxygen, preferably under pressure, ... | 05/21/1991 |
| 4957720 | Process for the generation of mechanical energy in the ammonia oxidation step of a nitric acid production process A process for the generation of mechanical energy in the ammonia oxidation step of process for the production of nitric acid is disclosed, whereby the utilization of process heat is improved, particularly the exploitation of heat contained in NOx | 09/18/1990 |
| 4925639 | Removal of nitric oxide from waste gases and recovery as nitric acid A process is provided for removing nitric oxide from effluent vent or flue gas by subjecting the gas cyclically to scrubbing with a nitric acid stream and to electrolysis of the resulting nitric acid stream containing dissolved nitric oxide to oxidize the... | 05/15/1990 |
| 4925643 | Regeneration of nitrous acid by oxidation with direct application of heated nitric acid A method for regenerating an aqueous liquid comprising nitrous acid and/or oxides of nitrogen is characterized by feeding the liquid to a column such that the liquid descends through the column. An aqueous solution comprising nitric acid is heated to its ... | 05/15/1990 |
| 4603036 | Process for treatment of a gas stream containing nitrogen oxides An oxido-reduction process for nitrogen oxides contained in a gas stream also containing oxygen, in a countercurrent gas-liquid contact device. In this process, (a) for values of the ratio NO/NO2 greater than 1, in that section of the gas-liqui... | 07/29/1986 |
| 4562052 | Process for the removal of nitrogen oxides from nitric acid plant tail gas The present invention involves a process for removing nitrogen oxides from an off gas stream, such as nitric acid plant tail gas. The off gas is scrubbed with concentrated nitric acid to remove nitrogen oxides to a concentration below about 200 ppm. The n... | 12/31/1985 |
| 4557920 | Process for making fuming nitric acid A process for making fuming nitric acid involving the reacting of nitrogen dioxide gas with dry hydrogen chloride gas to produce the fuming nitric acid directly, and to produce as a co-product nitrosyl chloride gas; separating the formed liquid fuming nit... | 12/10/1985 |
