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6517793 |
Method of reducing Nox compounds in flue gases of recovery boiler
A method of reducing NO X compounds in the odor gases of a recovery boiler. In the method, ammonia in the odor gases is separated before the odor gases are combusted, the ammonia being then...
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6517801 |
Treatment of gas streams containing hydrogen sulphide
A feed gas stream containing hydrogen sulphide is subjected in a furnace 6 to reactions in which part of the hydrogen sulphide is burned to form sulphur dioxide, and is which the sulphur dioxide...
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6506357 |
Sulphur recovery
Sulphur is recovered from a first gas stream comprising hydrogen sulphide and at least 50% by volume of ammonia and from a second gas stream comprising hydrogen sulphide but essentially no ammonia,...
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6488905 |
Destruction of waste gas
A gas stream containing at least 50% by volume of ammonia but eventually no hydrogen sulphide is burned in a reaction region which is supplied with oxygen and oxygen-enriched air. Both combustion...
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6479026 |
Method of denitrating exhaust gas
The present invention provides a method of denitrating exhaust gas, which can control the NOx removal efficiency of exhaust gas at 90% or higher while suppressing the release of unreacted ammonia...
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6471926 |
Method of using aerogel honeycomb catalyst monoliths for selective catalytic reaction of gas phase chemical species
A method for utilizing ultra-thin catalytic monoliths, internal molding and high concentrations of reactive catalytic species to exploit the unique high surface area of Aerogels in order to achieve...
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6352680 |
Partial combustion of hydrogen sulphide
Sulfur vapor is formed by partial oxidation of hydrogen sulphide. A burner is operated so as to establish a flame in a furnace in or into which the burner fires. There is supplied to the flame from...
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6331281 |
Process and apparatus for cleaning exhaust gas
There are disclosed a process for cleaning ammonia-containing exhaust gas which comprises bringing the exhaust gas into contact with an ammonia decomposition catalyst (e.g. nickel, ruthenium) under...
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6301879 |
Exhaust gas purification system for denoxing exhaust gases from combustion units
An exhaust gas purification system for denoxing exhaust gases has a converter containing a substance thermolytically separable into NH 3 , a feed line connecting the converter with an exhaust gas...
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6299847 |
Ammonia catalytic abatement apparatus and method
An ammonia catalytic abatement apparatus and method having two types of catalytic converters in line, wherein the first catalytic converter preferably including platinum as the catalytic agent...
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6294097 |
Method for treating waste water containing nitrate ions
There is disclosed a method for treating waste water containing nitrate ions by subjecting the waste water to decomposition and oxidation to eliminate a harmful gas, the method including the steps...
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6290066 |
Method for removal of ammonia from fly ash
A method for removing ammonia and ammonia compounds from fly ash and other combustion by-products is provided. The method may be performed with raw or processed fly ash, or it may be performed in...
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6282880 |
Method of utilizing purge gas from ammonia synthesis
The invention provides an improved ammonium synthesis process. A synthesis gas is separated with a membrane into a hydrogen-rich gas and a hydrogen-depleted gas. The hydrogen rich gas is shifted...
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6190629 |
Organic acid scrubber and methods
A scrubber assembly for removal of water soluble and/or alkaline gases from an exhaust stream uses a scrubber mixture contained within at least one scrubber vessel. Preferably the scrubber mixture...
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6176079 |
Process and apparatus for reducing nitrogen-oxide emissions in exhaust gas
A method of cleaning an exhaust gas from a combustion system that is operated alternately in lean and rich conditions includes intermediately storing nitrogen oxides during lean operation;...
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6136283 |
Removal of nitrogen oxide from gas streams
Temperature rise during the exothermic reduction of nitrogen oxides contained in a carbon dioxide-rich gas stream to nitrogen by contacting the gas stream with ammonia in a reactor containing a...
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6113871 |
Catalytic decomposition of ammonia and hydrogen cyanide in coke-oven gas
A supported metal oxide catalyst for the decomposition of ammonia and hydrogen cyanide in coke-oven gas is free of noble metals and comprises, based on the total catalyst, from 2 to 5.5% by weight...
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6107353 |
Cyanide and ammonia removal from synthesis gas
Cyanide and ammonia are removed from a gas, such as a synthesis gas, by catalytically hydrolyzing cyanide in the gas to ammonia, water scrubbing the hydrolyzed gas to dissolve ammonia and at least...
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6080376 |
Methods of denitrating exhaust gases
A method of denitrating an exhaust gas by means of removing nitrogen oxides catalytically using ammonia as a reducing agent while introducing an exhaust gas containing the nitrogen oxides into a...
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6077494 |
Method for removing ammonia from ammonia contaminated fly ash
A method for removing ammonia from coal fly ash contaminated by ammonium salts is disclosed. The method involves the addition of small amounts of water, and in some cases, small amounts of an...
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6066303 |
Apparatus and method for reducing NOx from exhaust gases produced by industrial processes
Gas-phase methods and systems for reducing NOx emissions and other contaminants in exhaust gases, and industrial processes using the same, are disclosed. In accordance with the present invention,...
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6051040 |
Method for reducing emissions of NO.sub.x and particulates from a diesel engine
A method improves the operation of a diesel engine through the use of a fuel additive, a diesel particulate trap and a NO x -reducing catalyst. The operation of the NO x -reducing catalyst is...
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6030494 |
Method of treating melodorous gases of a pulp mill
A method is provided for reducing emissions of harmful nitrogen compounds from a pulp mill (e.g. kraft mill) having malodorous gases which include ammonia and reduced sulphur compounds therein. The...
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6001223 |
On-site ammonia purification for semiconductor manufacture
Highly purified ammonia for use in semiconductor manufacturing is prepared on-site by drawing ammonia vapor from a liquid ammonia reservoir, passing the vapor through a filter capable of filtering...
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6001321 |
Exhaust gas treatment apparatus and method
An exhaust gas treatment apparatus for the removal of at least a sulfur dioxide gas and ammonia from an exhaust gas by bringing the exhaust gas into vapor-liquid contact with an absorbing liquid...
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5997829 |
Environment purifying material
The present invention is directed to a sheet-form environment purifying material comprising particles of metal and/or metal oxide consisting essentially of at least one member being selected from...
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5993763 |
Catalyst and process for decomposing HCN in gases
A catalyst based on titanium oxide, zirconium oxide or combinations thereof for decomposing HCN in gases, which additionally comprises: molybdenum, vanadium, tungsten, manganese, silicon, selenium,...
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5968232 |
Method for ammonia production
A process for the separation of ammonia dissolved in a gaseous solvent is used to recover ammonia during the production of ammonia from a synthesis gas. The process may be used to extract and...
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5968214 |
Air cleaning apparatus for vehicles
An air cleaning apparatus for vehicles includes an ozone generator, diffusing plate, and activated charcoal filter, which are disposed sequentially from the upstream side of air flow in an air...
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5925326 |
Process for the production of high purity carbon dioxide
Food grade carbon dioxide is produced from oxyfuel fired glassmaking furnace waste gas by a series of steps including quenching the waste gas with aqueous quench liquid, dry-filtering sulfur salt...
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5906803 |
Process for removing ammonia from gasification gas
The invention relates to a process for the removal of ammonia from gasification gas by selective oxidation in the presence of a solid catalyst. The oxidant used may be a mixture of oxygen and one...
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5904910 |
Method for producing sulfur and hydrogen from a gaseous stream containing hydrogen sulfide and ammonia
A method for producing hydrogen and sulfur from a first gaseous mixture containing hydrogen sulfide and ammonia by separating ammonia from the first gaseous mixture to produce a second gaseous...
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5897687 |
Ammonia adsorption apparatus
Disclosed is an ammonia adsorption apparatus for removing ammonia contained in a treated gas discharged from a denitrator for decomposing nitrogen oxides present in exhaust gas using ammonia as a...
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5891345 |
Treatment process for wastewater streams
A process for the destruction of organic compounds selected from the group consisting of nitriles, aromatics, heteroaromatics, amides, organic acids, aldehydes and alcohols from wastewater,...
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5853682 |
Process for cracking ammonia present in a gas containing hydrogen sulphide
A process is described for the catalytic cracking of ammonia present in a fluid containing hydrogen sulphide, in which the fluid is introduced into a reactor comprising a suitable catalyst and a...
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5842345 |
Heat recovery and power generation from industrial process streams
Work is recovered from a first process stream in a high temperature range by heating and vaporizing a condensate-containing mixed component working fluid, expanding the vapor in an expansion...
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5820839 |
Process for the decomposition of hydrogen cyanide, ammonia, or mixtures thereof in the gas phase
Hydrogen cyanide or ammonia present in a gaseous stream is decomposed catalytically in the presence of oxygen at relatively low temperature by contact with carbonaceous adsorbents doped with oxides...
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5792572 |
System for treatment of acid fuel cell fuel gas stream
Ammonia which is found in fuel cell fuel gases is removed therefrom by passing the fuel gas stream through a scrubber bed of porous carbon pellets containing phosphoric acid. The ammonia reacts...
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5783160 |
Method for purifying combustion exhaust gas
The method for purifying combustion exhaust gas according to the present invention utilizes a NH 3 decomposing catalyst. The NH 3 decomposing catalyst in the present invention is capable of...
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5756058 |
Process for purifying sulfur oxides-containing gas
Impurities such as halides and ammonia are efficiently removed from a gas containing Sox at a high concentration without any substantial addition of fresh water in a process for purifying a sulfur...
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5679314 |
Method for recovering ammonia adsorbent
A method for recovering an ammonia adsorbent which comprises streaming an NO x -containing gas at 300°-600° C. through an ammonia adsorbent layer which adsorbs ammonia and which is saturated...
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5679313 |
Ammonia decomposition catalysts
An ammonia decomposition catalyst wherein a first catalyst having a crystalline silicate which is represented by the formula in terms of molar ratio of oxides as dehydrated: (1±0.8)R 2 O. aM 2 ...
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5672326 |
Method of treating vapors containing ammonia and hydrogen sulfide
Ammonia and 5 to 40 volume percent hydrogen sulfide containing vapors which arise in the vaporization of process water from hydrogenation or a crude oil fraction or in gas treatment in a coking...
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5662872 |
Process for cleaning harmful gas
There is disclosed a process for cleaning a harmful gas which comprises bringing a gas containing a basic gas as a harmful component such as ammonia and amines into contact with a cleaning agent...
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5635076 |
Treatment process for acrylonitrile plant wastewater streams
A process for the destruction of organic wastes and ammonia from acrylonitrile plant wastewater, comprising contacting volatilized wastewater with a catalyst at an elevated temperature so as to...
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5632964 |
Cleaning method for exhaust gas containing ammonia and silane
A cleaning method for an exhaust gas containing ammonia, silanes, and organometallic compounds exhausted from a nitride film production step, etc., for producing compound semiconductors. After...
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5589146 |
Method for treating ammonia
A method for treating ammonia in an exhaust gas on the downstream side of a dry denitration device using ammonia as a reducing agent comprises the step of alternately carrying out ammonia...
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5587134 |
Process for decomposing ammonia in an off-gas
In a process for the catalytic low temperature oxidation of ammonia to nitrogen in an ammonia containing off-gas at a temperature of between 200° C. and 500° C. the improvement comprises, ...
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5534236 |
Removing ammonia from an ammonia-containing gas mixture
A process of removing ammonia from an ammonia-containing gas mixture including introducing a precursor of nitrogen oxides into the gas mixture at a temperature above the decomposition temperature...
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5516497 |
Staged metal-promoted zeolite catalysts and method for catalytic reduction of nitrogen oxides using the same
A zeolite catalyst composition is provided in which a first or upstream zone of the catalyst has a lower metal (e.g., iron or copper) promoter loading than the metal promoter moter loading of the...
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