67results about "Nitrogen dioxide" patented technology

Redox flow devices are described in which at least one of the positive electrode or negative electrode-active materials is a semi-solid or is a condensed ion-storing electroactive material, and in which at least one of the electrode-active materials is transported to and from an assembly at which the electrochemical reaction occurs, producing electrical energy. The electronic conductivity of the semi-solid is increased by the addition of conductive particles to suspensions and/or via the surface modification of the solid in semi-solids (e.g., by coating the solid with a more electron conductive coating material to increase the power of the device). High energy density and high power redox flow devices are disclosed. The redox flow devices described herein can also include one or more inventive design features. In addition, inventive chemistries for use in redox flow devices are also described.

The present invention includes carbon synthesis devices and systems. The invention also includes machines and instruments using those aspects of the invention. The present invention also includes methods of carbon synthesis. The present invention includes an array of carbon nanotubes, each nanotube having a longitudinal axis. The nanotubes are placed into an array such that the longitudinal axes of all nanotubes in the array are substantially parallel. The array may be a two-dimensional array or a three-dimensional array. The present invention also includes methods of preparing such carbon molecular clusters and arrays thereof.

Disclosed herein are reusable apparatus for the generation of a gas including a reactant chamber defined at least in part by a gas permeable material and a resealable opening. In certain embodiments the gas permeable material is substantially impervious to the passage of liquid and/or allows for the controlled passage of gas. Also disclosed are methods for using the apparatus, reusable reactant chambers, kits including reactants and reactant refill kits.

The invention discloses a method for recovering nitric acid by pyrolyzing nitrate. The method comprises the following steps: (1) conveying the nitrate into at least two preheaters, heating the nitrateto firstly liquefy the nitrate, and then heating the nitrate to a temperature less than decomposition temperature in order to obtain a nitrate hot fluid; (2) conveying the nitrate hot fluid into a decomposer, and heating the nitrate hot fluid with a high temperature gas to maintain the internal temperature of the decomposer at 500-800 DEG C in order to decompose the nitrate into a mixed gas and asolid powder; and (3) separating mixed gas and the solid powder, conveying a part of the mixed gas into a nitric acid recovery tank, heating the remaining mixed gas to 500-800 DEG C, and then returning the heated remaining mixed gas into the decomposer to heat the nitrate hot fluid in order to thermally decompose the nitrate hot fluid. The method for recovering nitric acid has the advantages of less corrosion damages to devices, no introduction of other impurity components and no interference in the heating process, good decomposition speed and decomposition rate of the nitrate, and high recycling rate of the nitric acid.

Nitric oxide (NO) is oxidized into nitrogen dioxide (NO2) by the high temperature decomposition of a hydrogen peroxide solution to produce the oxidative free radicals, hydroxyl and hydroperoxyl. The hydrogen peroxide solution is impinged upon a heated surface in a stream of nitric oxide where it decomposes to produce the oxidative free radicals. Because the decomposition of the hydrogen peroxide solution occurs within the stream of the nitric oxide, rapid gas-phase oxidation of nitric oxide into nitrogen dioxide occurs.

The invention relates to an improved composition for generating at least one gas comprising an energy-activated catalyst capable of being activated by electromagnetic energy, heat and/or moisture and anions capable of being oxidized or reacted to generate at least one gas, the composition, when exposed to electromagnetic energy, heat and/or moisture being capable of generating and releasing the gas after activation of the catalyst and oxidation or reaction of the anions. The process comprises: (a) metering a liquid composition comprising a source of the anions, specifically sodium chlorite, into a flow restrictor; (b) injecting a gas stream through the flow restrictor, concurrently with step (a) to create a zone of turbulence at the outlet of the flow restrictor, thereby atomizing the liquid composition; (c) heating the gas stream prior to injecting the gas stream through the flow restrictor; and (d) adding the energy-activated catalyst, specifically titanium dioxide, to the zone of turbulence concurrently with steps (a) and (b) to contact the energy-activated catalyst with the atomized liquid composition wherein the contacting at the zone of turbulence treats the energy-activated catalyst with the source of the anions. The titanium dioxide can be pigmentary or nano-sized. The composition can be useful in polymeric composition, specifically for making a body covering article.

Disclosed herein are methods and articles that include a plasmon-resonating nanostructure that employ a photo-thermal mechanism to catalyze the reduction of an oxidant. As such, the plasmon-resonating nanostructure catalyzes a redox reaction at a temperature below a predetermined activation temperature. The method can be efficiently used to catalyze the reduction of an oxidant, for example in a catalytic reactor or in a fuel cell that includes a photon source.

The invention relates to a method for preparing active carbon loaded with manganese oxide by a hydrothermal method and a device thereof. The method comprises the following steps: firstly carrying out equivalent-volume impregnation on vacuumdryingactive carbon and potassium permanganate solution, then putting the active carbon, the potassium permanganate solution and mixed solution of manganese nitrate and nitric acid together into a hydrothermal crystallization device for reaction, cooling and separating obtained solid-liquid mixture, washing and drying solid-phase products, calcining in inertial gas to obtain modified active carbon powder loaded with the manganese oxide; and the modified active carbon powder has good property in low-temperature NO catalytic oxidation, and the conversion rate is 48.5%-58.3%. The invention also discloses the device for implementing the method for preparing the active carbon loaded with the manganese oxide by the hydrothermal method. The equipment is high in automation degree, clean in production process, simple in process and low in cost.

The invention discloses a nitrogen tetroxide leakage collection device and method. The nitrogen tetroxide leakage collection device comprises a collection pipe, a collection container connected to thecollection pipe, an exhaust gas treatment module, a high negative pressure suction device and an electronic control module. The collection container and the exhaust gas treatment module are providedwith cooling systems. The upper part of the collection container is provided with a gas outlet. The gas outlet is connected to the negative pressure suction device through a gas suction pipe. The gassuction pipe between the collection container and the negative pressure suction device is provided with an absorption device for removing exhaust gas. Through being driven by the negative pressure suction device, the leaked nitrogen tetroxide liquid/gas and nitrogen dioxide are sucked into the inner collection container through the collection pipe, the gas-liquid mixture is subjected to gas-liquidseparation and cooling liquidation, the nitrogen tetroxide liquid is collected, and the tail gas is subjected to adsorption filtration so that toxic and hazardous substances in the tail gas are removed and thus collection efficiency is high and the environmental protection and conservation of resources are realized.

A process for decomposing nitrogen oxides includes the following steps: providing a catalyst, passing a gaseous nitrogen oxide over the catalyst and exposing the catalyst to microwave energy. The gaseous nitrogen oxide is broken down into nitrogen and oxygen molecules.

A method for reprocessing spent nuclear fuel from a light water reactor includes the step of reacting spent nuclear fuel in a voloxidation vessel with an oxidizing gas having nitrogen dioxide and oxygen for a period sufficient to generate a solid oxidation product of the spent nuclear fuel. The reacting step includes the step of reacting, in a first zone of the voloxidation vessel, spent nuclear fuel with the oxidizing gas at a temperature ranging from 200-450° C. to form an oxidized reaction product, and regenerating nitrogen dioxide, in a second zone of the voloxidation vessel, by reacting oxidizing gas comprising nitrogen monoxide and oxygen at a temperature ranging from 0-80° C. The first zone and the second zone can be separate. A voloxidation system is also disclosed.

The invention belongs to the technical field of gas recycling in flue gas, and particularly relates to a method and system for adsorbing, purifying, enriching and recycling nitrogen oxides in flue gas. The method comprises the steps that firstly, the flue gas is desulfurated, cooled, dehydrated and re-cooled on the premise of ensuring that the flue gas does not form acid or dew in the transportation process, and the content of NOX components is not reduced; then sulfur-free and anhydrous flue gas at normal temperature is introduced into an adsorber to adsorb the NOX for desorption; after adsorption is saturated, an adsorbent is desorbed and regenerated in a heating and negative pressure mode to obtain mixed desorbed gas with high concentrations of NO2 and NO; finally, a rectification method is adopted for liquefying, separating and concentrating the desorbed gas to obtain high-purity NO2 liquid-state and NO gas-state products. The method overcomes the defects of existing methods for lossless enriching and recycling of NOX in the flue gas, and the NO and NO2 products with very high added values are formed while the NOX in the flue gas is efficiently desorbed; meanwhile, the waste heat resource is sufficiently utilized, and compared with the prior art, the method and system have more obvious economic benefits.

The invention discloses a method for increasing the yield and quality of greenhouse vegetables. Nitric Oxide gas is fertilized in a greenhouse once a day from three to four weeks before the harvest time of the greenhouse vegetables till the day before the harvest time according to routine estimation, the amount of fertilizer applied each time is 0.5 to 2 mL/m<3>. The invention also provides an acquisition device of NOx gas for realizing the method, which comprises a gas collection bag which is provided with an inlet and a gas extracting port. A reaction vessel is arranged on a heating device, one end of a connecting tube is connected with the outlet of the reaction vessel in a sealing way and the other end is connected with the inlet of the gas collection bag in a sealing way, and the connecting tube is provided with a regulator. The method of the invention can not only reduce the nitrate content in the vegetables but also increase the yield of the vegetables.

The invention relates to a method for producing N2O4 (nitrogen tetroxide) through combining normal pressure diluted nitric acid, pressurized diluted nitric acid and concentrated nitric acid devices. The method comprises the following steps that the normal pressure diluted nitric acid, pressurized diluted nitric acid and concentrated nitric acid devices are combined for preparing NO2 (nitrogen dioxide) gas; liquid-stage N2O4 is prepared; and the discharged tail gas is treated. The public engineering conditions of the existing device and idle equipment can be sufficiently utilized, the investment is reduced, and the building construction period is shortened. The combination of the normal pressure diluted nitric acid, pressurized diluted nitric acid and concentrated nitric acid devices is realized, and the industrial level N2O4 is produced for reaching the goals of revitalizing the existing assets, increasing the product varieties and improving the risk-resistance capability of enterprises.

The invention discloses a preparation method and device of nitrogen oxide. The preparation method includes following steps: preheating and mixing a nitric acid solution and a nitrite solution for reaction to generate nitrogen oxide gas, wherein nitrogen oxide is NOx, and x is greater than 1 and smaller than 2. The preparation method is easy-to-get in raw material, simple in process, easy in reaction, conducive to continuity of production operation and capable of ensuring continuous and stable supply and use of nitrogen oxide serving as an oxidant in a nuclear fuel aftertreatment plant.

The invention discloses an NO2 pre-reaction device system used in industrial production of ethylene glycol, which comprises an NO2 prereactor connected with an NO compressor through a pipeline, wherein an outlet of the NO2 prereactor is connected to an esterification column, the NO2 prereactor is a vertical reactor, and a cooling device is arranged inside or outside the NO2 prereactor. The original NO2 prereactor (empty barrel type reactor) is modified into a tubular NO2 prereactor, so that the NO2 pre-reaction device system has the advantages that the oxidation reaction is exothermic reaction, the adopted tubes are favorable for heat exchange, the reaction speed is accelerated by circulating water condensation, the liquid accumulation also can be avoided, the potential safety hazard is eliminated, and the reaction can be fully carried out.

The invention relates to a preparation method and apparatus of nitrogen oxides. The method includes using concentrated nitric acid and sodium nitrite as reaction liquids, and using air flow to performstripping the reaction liquids to obtain nitrogen oxides. The apparatus herein comprises a filler column, a reaction liquid storage tank, a nitrogen oxide pending tank and a receiving tank; all the reaction liquid storage tank, the nitrogen oxide pending tank and the receiving tank are connected with the filler column; the reaction liquid storage tank comprises a nitric solution storage tank anda sodium nitrite solution storage tank; the lower portion of the filler column is also provided with an intake line. The preparation method has the advantages that concentrated nitric acid and sodiumnitrite are matched to replace concentrated nitric acid, so that the corrosive effect of the concentrated nitric acid upon equipment and lines is avoided; air is utilized to perform contact strippingon the reaction flows, the blown-in air helps oxidize nitrogen monoxide in a system into nitrogen dioxide, so that oxidation effect of nitrogen oxides is improved; an insulation system helps hold theinterior temperature of the filler column to a high level, so that the nitrous acid can be carried out in nitrogen oxide form.

The invention discloses a rectification dehydration tower and a dehydration method for nitrogen dioxide. According to the rectification dehydration tower, a condensation section, a rectification section and a re-boiling section are arranged inside the rectification dehydration tower from top to bottom, wherein the re-boiling section is provided with a heat medium introduction pipeline and a heat medium eduction pipeline, the condensation section is provided with a cold medium introduction pipeline and a cold medium eduction pipeline, a nitrogen dioxide feeding pipeline is arranged on the middle portion of the rectification dehydration tower, the upper portion of the rectification dehydration tower is provided with a product outlet pipeline, the bottom of the rectification dehydration tower is provided with a raffinate outlet pipeline, and the nitrogen dioxide feeding pipeline is provided with a regulation valve. The method comprises that a nitrogen dioxide raw material enters and is subjected to rectification, wherein gas pressure on the top pf the rectification dehydration tower is 0.06-0.46 MaPG, the theoretical column plate number of the rectification dehydration tower is 3-26, and a reflux ratio is 0.46-16. With the present invention, water in the raw material dinitrogen tetroxide or nitrogen dioxide can be effectively removed, and the high purity nitrogen dioxide (or dinitrogen tetroxide) product containing a trace amount of water can be prepared.

The invention provides a method for preparing an NO2 gas oxidizing agent through metal nitrate pyrolysis. An air compressor (2) and a metal nitrate storage bin (1) are connected with a nitrate bin (3), the air compressor (2) conveys nitrate powder to the nitrate bin (3) by conveying air, the nitrate bin (3) is connected with a conveyor (5) through an air blocking valve (4), an outlet of the conveyor (5) is connected with the air blocking valve (4) on the lower side, the air blocking valve (4) is connected with an articulated chute (B), and the nitrate powder is conveyed into a tubular microwave pyrolyzer (6). The upper end of the discharging cover (C) of the tubular microwave pyrolyzer (6) is connected with a gas conveying pipe (A) and a spiral vacuum pump (7), O2 and NO2 are conveyed to an NO2 storage tank (8) for producing high-purity NO2 or nitric acid, the lower end of the discharging cover (C) is connected with the air blocking valve (4) and the conveyor (5), and metal oxide powder is conveyed to a metal oxide storage bin (9) for recycling.