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7364711 Method for removing N2O during the production of nitric acid  
N 2 O is removed in nitric acid manufacture by using catalysts comprising three-dimensional structures coated with catalytically active materials.
7258849 Method for the production of nitric acid  
The invention relates to a method for the production of nitric acid having a concentration of between 50 and 76%, from ammonia and gas containing oxygen, under pressure, according to a single...
7192566 Process for the catalytic decomposition of N2O to N2 and O2 carried out at high temperature  
The invention relates to a process for the catalytic decomposition of N 2 O to N 2 and O 2 . This process is carried out at a high temperature, generally of between 700 and 1000° C., at a high...
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...
7087550 Combination of a guard bed and a catalyst bed  
A combination comprising a bed of a particulate copper-containing catalyst bed, a guard bed in the form of shaped units formed from lead carbonate and/or basic lead carbonate particles having an...
6743404 Method for the catalytic decomposition of N2O  
A reactor for the catalytic oxidation of ammonia to form nitrogen oxides which has a noble metal gauze catalyst and a heat exchanger in that order in the direction of flow, a catalyst for the...
6649134 Method and apparatus for reducing nitrous oxide  
A process and a device for reducing the nitrous oxide which is formed during the catalytic combustion of ammonia and oxygen to form nitrogen oxides. A catalyst system including at least one first...
6534029 Method and apparatus for producing nitric oxide  
In the method of preparing nitric oxide by burning NH 3 with oxygen, over a catalyst network in which the reaction product gases contain N 2 O and are cooled, the N 2 O is eliminated by oxidation...
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...
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...
6238634 Process for the nondestructive heating and supply of hot ammonia or hot ammonia containing feed gas  
A process for nondestructive heating and supplying of ammonia feed gas wherein high quality ammonia (typically greater than 90% and as high as 99%) is preserved at temperatures well in excess of...
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...
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...
6056928 Method of removing nitrogen oxides from a gas flow  
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,...
5783382 Method for storing liquid diagnostic reagents  
Disclosed is a method for stably storing a liquid diagnostic reagent, comprising air-hermetically keeping the liquid diagnostic reagent in a closed container in the presence of a disoxidant...
5690900 Ammonia oxidation catalyst  
A catalyst composition for oxidation of ammonia in the production of nitric acid incorporates a porous ceramic structure which is at least partially coated, the coating including a layer containing...
5401483 Catalyst assembly providing high surface area for nitric acid and/or HCN synthesis  
A catalyst assembly is disclosed which comprises a plurality of foraminous wire mesh sheets disposed in intimate nested relation to each other along their broad surfaces, the wire sheets defining a...
5364609 Process for the preparation and processing of a hydroxylammonium salt solution  
A process for the preparation and processing of a hydroxylammonium salt solution involves maintaining an aqueous acid reaction medium circulation between a hydroxylammonium salt synthesis zone and...
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...
5356709 Non-PVC coextruded medical grade port tubing  
The present invention provides an improved coextruded medical grade port tubing. The medical grade port tubing provides characteristics that are desirable in the medical industry and therefore can...
5268157 Process for the production of catalytic gas permeable nets and process for oxidizing ammonia  
Wires of platinum containing 4 to 12% rhodium or 4 to 12% of palladium and rhodium (4 to 12% being in reference to the sum of palladium and rhodium and not the percent values for each individually)...
5266291 Packed bed arrangement for oxidation reaction system  
The present invention relates to processes and apparatus for mixing oxidizable reactants with oxidant and oxidizing oxidizable reactants. When ammonia is used as the reactant, nitric acid can be...
5256387 Catalyst for the production of nitric acid by oxidation of ammonia  
Reticulated ceramic or metal substrate coated with Cobalt compounds, noble metals or mixtures thereof are superior catalysts for the oxidation of ammonia to produce nitric oxide.
5217939 Catalyst for the prduction of nitric acid by oxidation of ammonia  
Reticulated ceramic or metal substrate coated with Cobalt compounds, noble metals or mixtures thereof are superior catalysts for the oxidation of ammonia to produce nitric oxide.
4973457 Method for the reduction of nitrogen oxide  
The present invention relates to a method of reduction of nitrogen oxides in gas mixtures, especially the removal/decomposition of nitrogen oxide in hot combustion gases. The hot gas mixture which...
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,...
4869890 Control of nitric acid plant stack opacity during start-up and shutdown  
The present invention is a process for the control of nitric acid plant stack opacity in the range from 0 to 10 percent during plant startup and shutdown. The process is a series of sequential...
4818494 Apparatus for manufacturing nitrogen fertilizer solutions  
To make and use nitrogeneous fertilizer on a farm, nitrogen oxides are prepared in a continuous process from air or from ammonia in a reactor, with the ammonia either being transported to the farm...
4711771 Process and apparatus for cooling a gaseous stream before and/or during its compression  
The invention relates to the compression of a gaseous stream 1. The stream 1 is cooled by a liquid 15 that evaporates at least partially in the gaseous stream. The injected liquid has a composition...
4668494 Method of using solar energy in a chemical synthesis process  
A method of using solar energy in a chemical synthesis process comprising steam reforming hydrocarbons or gasifying carbonaceous fuel, converting the product of the steam reforming of hydrocarbons...
4530826 Method for recovering and utilizing waste heat  
In a process for producing chemical substances comprising steps of cooling, condensing and solvent-absorbing the reaction product gas having a high temperature formed in a reactor, an absorption...
4511539 Recovery of precious metal  
The invention relates to the recovery of precious metal lost from precious metal-containing catalysts for example the precious metal-containing catalysts which are used in the production of nitric...
4416952 Oxynitride film and its manufacturing method  
The oxynitride film according to the present invention contains Ga and/or Al and has O/N ratio of at least 0.15. This film is obtained by relying on, for example, chemical vapor deposition...
4397772 Catalyst supports and fluid treatment devices  
A device for treating a fluid, in particular a supported catalyst for motor vehicle exhaust gas purification. The device comprises one or more short helically wound lengths of wire at least a...
4389339 Process for making a cobalt oxide catalyst  
A process for preparing an improved cobalt oxide catalyst for ammonia oxidation comprising decomposing a cobalt compound such as basic cobalt carbonate by heating to form cobalt oxide, then...
4330520 Process and apparatus for preventing NO.sub.x emissions after emergency shutdowns of plants for the manufacture of nitric acid  
The process and apparatus described seeks to prevent NO x emissions after an emergency shutdown in a process for manufacturing nitric acid by catalytic combustion of ammonia, compression of the...
4305919 Process and plant equipment for the short-term propulsion of one or several turbines coupled to an air and/or nitrous gas compressor in a plant for the production of nitric acid  
A process and a plant are disclosed whereby nitric acid is produced by the catalytic combustion of ammonia with air to form nitrous gases which are contacted with water in an absorption zone to...
4296086 Monitoring process and apparatus  
In a process and apparatus for maintaining the efficiency of ammonia oxidation in a nitric acid plant, the ammonia content of the reactant mixture and the nitrogen oxide content of the reaction...
4183906 Oxygen-enrichment columnar absorption process for making nitric acid  
An improved process for the manufacture of nitric acid involving catalytic oxidation of ammonia and passage of the resulting nitric oxide through columnar absorption zones, the improvement...
4087250 Apparatus for removing nitric oxides from processing exhaust gases  
Exhaust gases containing residual nitric oxide constituents from a processing operation are maintained at an elevated pressure, heated to from 260° C. to 340° C. in a separate heat exchanger, and...
4062928 Process for the preparation of nitric acid  
A process for the preparation of nitric acid from nitrogen oxides, oxygen and water which utilizes an aqueous stripping liquid having a nitric acid content within a specified range which passes...
4031187 Process for the production of nitric acid  
Nitric acid having a concentration of at least 98% by weight is obtained from a gaseous stream resulting from catalytic oxidation of ammonia and containing nitrogen oxide and steam, by flowing said...
4018873 Processes for the preparation of concentrated nitric acid  
Nitric acid having a concentration of at least 98 wt.% is prepared by recovering in liquid state nitrogen peroxide from a gaseous flow containing the same, by absorption in nitric acid, heating of...
4018872 Process for the production of concentrated nitric acid  
Nitric acid having a concentration of at least 98 wt.% is produced from nitrogen peroxide by absorbing the latter in superazeotropic nitric acid, distilling the resulting solution so as to recover...
3977832 System for control of a nitric acid plant  
In the operation of a nitric acid plant, the rate of flow of process air to the converter in which ammonia is oxidized is controlled by injection of steam at regulated rates into the heated tail...
3962138 Cobalt-oxide-based catalytic substances for the oxidation of ammonia  
The invention concerns catalytic substances for the oxidation of ammonia, for the production of nitric acid, comprising cobalt oxide as the main component. Such substances, besides cobalt oxide,...
3927182 Process for making nitric acid by the ammonia oxidation-nitric oxide oxidation-water absorption method  
An improved process for the preparation of nitric acid by the ammonia oxidation-nitric oxide oxidation-water absorption method characterized by substantially reduced nitrogen oxide emission is...
3881877 Catalyst supporting screen  
A catalyst supporting structure comprising a layer of heat-resistant wire elements composed of knitted wire, placed in contiguous relationship with each other to provide a pad of substantially...
3881004 Ammonium nitrate plant  
An ammonium nitrate fertilizer plant is provided with an ammonia converter for producing oxides of nitrogen, a waste heat boiler and a condenser for cooling the gases, a multi-stage countercurrent...
Matches 1 - 50 out of 133 1 2 3 >