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7613561 |
Measurement of NO and NO2 for control of selective catalytic reduction
A selective catalytic reduction system includes a catalyst, a device to measure an amount of nitrogen oxide (NO), a device to measure an amount of nitrogen dioxide (NO 2 ), a device to add an...
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7591987 |
Method and apparatus for treating ammonia-containing gas
A method for treating an ammonia (NH 3 )-containing gas, which comprises causing the NH 3 -containing gas to pass through a catalyst tower ( 9 ) firstly with a pre-treatment catalyst layer ( 1 )...
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7575732 |
Process for treating a gas stream
Processes for selectively removing sulfur-containing compounds from a gas are described herein. The processes generally include contacting a first gas including carbon dioxide and hydrogen sulfide...
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7550123 |
Method and apparatus for use of reacted hydrogen peroxide compounds in industrial process waters
Methods and apparatuses are described for contacting an oxidizing solution such as an aqueous hydrogen peroxide composition of hydrogen peroxide and at least one additive that catalyzes the...
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7521483 |
Coproduction of methanol and ammonia from natural gas
The invention relates to a method for the coproduction of methanol and ammonia from natural gas involving the following steps: 1. Natural gas (flow 1 ) , steam and oxygen are mixed with one...
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7498009 |
Controlled spectrum ultraviolet radiation pollution control process
A method for reducing or substantially eliminating oxides of nitrogen from an effluent gas stream, that includes providing a source of ultraviolet radiation with a precise wavelength, adding...
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7494634 |
Reduction of nitrogen oxides using multiple split streams
Systems and methods of removing at least nitrogen oxides from an exhaust fluid generally include dividing a flow of an exhaust fluid comprising a concentration of nitric oxide into three types of...
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7494633 |
Gas abatement
Apparatus is described for treating an effluent fluid stream from a semiconductor manufacturing process tool. The apparatus comprises a combustion chamber, means for heating the combustion chamber,...
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7485275 |
Method for removing acid gases and ammonia from a fluid stream
A method is provided for removing acid gases and ammonia from a fluid stream in which a fluid stream comprising acid gases and ammonia is brought into contact with an aqueous absorption medium. The...
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7470412 |
Reduction of CO and NOx in regenerator flue gas
A hot oxygen stream is fed into a catalyst regenerator flue gas stream that contains carbon monoxide to remove carbon monoxide. NOx precursors such as NH 3 and HCN are converted into N 2 and if...
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7462235 |
System and method for decomposing ammonia from fly ash
A system and method for decomposing ammonia from fly ash contaminated with ammonia is provided which includes maintaining the temperature of a bed of ammonia-contaminated fly ash at a decomposition...
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7442353 |
Heat recirculating cooler for fluid stream pollutant removal
A process by which heat is removed from a reactant fluid to reach the operating temperature of a known pollutant removal method and said heat is recirculated to raise the temperature of the product...
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7438876 |
Multi-stage heat absorbing reactor and process for SCR of NOx and for oxidation of elemental mercury
A selective catalytic reduction apparatus has at least first and last catalyst layers in series for reducing nitrogen oxides in a flue gas, at least one interstage heat exchanger located after the...
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7393511 |
Ammonia oxidation catalyst for the coal fired utilities
A process is described that removes by oxidation the excess ammonia (NH 3 ) gas from flue gases that have been subjected to selective catalytic reduction (SCR) of oxides of nitrogen (NO x ) by...
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7390471 |
Apparatus and method for catalytic treatment of exhaust gases
An exhaust gas treatment apparatus ( 20 ) for reducing the concentration of NO x , HC and CO in an exhaust gas stream ( 18 ) such as produced by a gas turbine engine ( 12 ) of a power generating...
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7390470 |
Process for treating a gas stream
Processes for selectively removing sulfur-containing compounds from a gas are described herein. The processes generally include contacting a first gas including carbon dioxide and hydrogen sulfide...
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7381389 |
Wet gas purification method and system for practicing the same
A wet gas purification method is provided for removing ammonia from a heavy oil gasification gas, such as coal. The method principally involves a washing step during which absorbent is charged into...
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7341701 |
Method, apparatus and plant for treating culinary gaseous effluents
A method and apparatus ( 22 ) for treating culinary gaseous effluents (Eg) carried in an air extraction duct of a kitchen, the apparatus includes:
a unit ( 24 ) for storing in liquid form a...
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7326391 |
Process for recovery and recycle of ammonia from a vapor stream
A process for the recovery of unreacted ammonia from the effluent from a reaction zone used to produce acrylonitrile or methacrylonitrile comprising quenching the reactor effluent with an aqueous...
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7276366 |
Biological scrubber odor control system and method
A system and method for the purification and biodeodorizing of a gas are disclosed. The system is highly adaptable and capable of operating in a variety of modes to tailor performance of the system...
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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...
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7250149 |
Sulfur gas treatment process
The present invention comprises a method of treating an off-gas stream from a refining process to remove sulfur compounds. A portion of the off-gas stream containing hydrogen sulfide is injected at...
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7244405 |
Method for cleaning coke oven gas
A method for cleaning coke oven gas by washing the gas, whereby a washing liquid is guided into a washing liquid circuit and impurities in the washing liquid are expelled in a desorber. According...
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7204967 |
Waste water process with scrubber
An apparatus and method for treating waste products produced by chemical processing plants. Steam stripping waste sour water results in a vapor including ammonia and hydrogen sulfide. A scrubber...
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7160527 |
Method for treating amonia-containing effluent water
Disclosed are a method and an apparatus for treating an effluent containing ammonia in which method and apparatus N 2 O concentration in the gas at the outlet of a catalyst tower does not rise to a...
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7153427 |
Nitrogen recovery system and method using heated air as stripping gas
A process for the recovery of nitrogen from anaerobically digested liquid waste and for the collection of the nitrogen as nitrate compounds that can be used to produce fertilizer and compost,...
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7067101 |
Water wall boiler for air and oxygen fired Claus sulfur recovery units
The thermal combustion step of the modified Claus process is carried out in a water-wall boiler instead of a refractory-lined reaction furnace. The water-wall boiler replaces the conventional...
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RE39041 |
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:
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7001490 |
Purification of ammonia by distillation
Crude ammonia is separated into a low boiler fraction, a high boiler fraction and an intermediate-boiling pure fraction by continuous fractional distillation in a distillation apparatus configured...
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6998098 |
Removal of gases from a feed
A process is presented for separating and removing acid gases or base gases from a feed gas by use of a gas permeable membrane and a permeate comprising a treatment solution. The treatment solution...
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6919059 |
Process and apparatus for recovering sulphur from a gas stream containing sulphide
Oxygen or oxygen-enriched air is employed to support combustion in furnaces ( 16 ) and ( 26 ) of part of the hydrogen sulphide content of a first feed gas stream. Sulphur vapour is extracted in...
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6902713 |
Method for partially oxidizing a gas stream comprising hydrogen sulphide and ammonia
A method for partially oxidizing, in a Claus furnace, at least one gas containing hydrogen sulfide and ammonia with at least one gas rich in oxygen. The residual ammonia content at the outlet of...
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6890498 |
Burner and method for partly oxidising a gas stream comprising hydrogen sulphide and ammonia
A gas burner for use with a Claus furnace made up of at least five concentric tubes and the spaces formed between them. The diameters of the tubes increase radially outward so that the first tube...
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6866779 |
Nitrogen recovery system and method
A process for the recovery of nitrogen from anaerobically digested liquid waste and for the collection of the nitrogen as nitrate compounds that can be used to produce fertilizer and compost,...
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6843971 |
Process and catalyst for reducing nitrogen oxides
A process for reducing the nitrogen oxides present in a lean exhaust gas from an internal combustion engine by selective catalytic reduction on a reduction catalyst using ammonia, wherein a...
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6837917 |
Process for the removal of ethylene oxide from air
A process for removal of ethylene oxide (EO) from ambient air laden with EO is passed through a zeolite-based removal media, which preferrably consists of the acid form of zeolite ZSM-5, herein...
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6790264 |
Control of ammonia emission from ammonia laden fly ash in concrete
The present invention relates to a pozzolanic admixture containing ammonia-laden fly ash, method for making the pozzolanic admixture and method for controlling ammonia gas (NH 3 ) emission from...
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6749819 |
Process for purifying ammonia
There are disclosed a process for purifying ammonia which comprises bringing crude ammonia into contact with a catalyst comprising manganese oxide as an effective ingredient to remove oxygen and/or...
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6746654 |
Dry and semi-dry methods for removal of ammonia from fly ash
A method for removing ammonia from fly ash employs water mist (a water fog) or a flowing warm humid air stream to rid the fly ash of ammonia. Ozone alone or with other co-oxidants such as hydrogen...
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6725647 |
Exhaust gas treatment units for internal combustion engines and processes for operating them
The present invention provides an exhaust gas treatment unit for an internal combustion engine. A first catalyst unit produces ammonia from corresponding constituents in a rich exhaust gas...
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6716405 |
Process for removing unreacted ammonia from an effluent in a hydrocarbon ammoxidation reaction
A process for removing unreacted ammonia from an effluent of a catalyst bed used in a hydrocarbon ammoxidation reaction is provided. The process includes a step of providing a fluidized bed...
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6713031 |
Structured catalysts for selective reduction of nitrogen oxides by ammonia using a compound that can be hydrolyzed to ammonia
A structured catalyst for selective reduction of nitrogen oxides with ammonia using an ammonia-supplying compound. The catalyst is preferably used for exhaust gas treatment of diesel vehicles...
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6706093 |
Method and apparatus for preventing iron contamination in corrosive service
A method which reduces iron contamination of a system which receives ammonia from an ammonia recovery process by one or more of the following techniques: a) Physically separating iron oxide, iron...
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6682709 |
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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6645447 |
Devices and method for chemical reactive filtration
A gas contaminant is filtered using fibers having internal cavities containing a chemically reactive oxidizing agent, an acid or base, a coordinating agent, a complexing agent, or a deliquescing...
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6623715 |
Complex shaped fiber for particle and molecular filtration
An ultra-efficient multilobal cross-sectioned fiber filter for chemical contaminant filtering applications is described. An absorptive chemically reactive reagent, preferably an acid or base and in...
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6620393 |
Method and apparatus for reducing “ammonia slip” in SCR and/or SNCR NOx removal applications
A method and apparatus for reducing the amount of unused ammonia (“ammonia slip”) in instances where ammonia is provided to SNCR and/or SCR processes for reducing NOx pollution in flue gas...
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6534030 |
Process for producing ammonium thiosulfate
A process for producing ammonium thiosulfate by contacting a feed gas containing hydrogen sulfide and ammonia with an aqueous absorbing stream containing ammonium sulfite and ammonium bisulfite to...
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6531104 |
Process for the absorption of sulfur oxides and the production of ammonium sulfate
A flue gas mixture containing sulfur oxides is scrubbed in a countercurrent spray tower absorber with a spray of ammonium sulfate liquor and the scrubbed gas stream containing ammonia aerosols,...
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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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