83 results about "Dinitrogen tetroxide" patented technology

The invention discloses a method for preparing a nitro compound from a low-valent nitric oxide. The method comprises that a low-valent nitric oxide such as nitric oxide, nitrogen dioxide, nitrous oxide, nitrogen trioxide, dinitrogen tetroxide and the like react with an alicyclic compound, an aromatic compound or a heterocyclic compound through promoting effects of molecular oxygen and effects of catalysts comprising a transition metal oxide, a triphenylphosphine metal organic complex, transition metal ion clay and heteropoly acid salts such as aluminosilicate, silicoaluminophosphate, sodium phosphomolybdate and the like. The method can replace the traditional industrial method for preparing a nitro compound from a high-valent (V-valent) nitrogen compound such as nitrogen pentoxide, hydrogen nitrate, nitric acid salts, nitric acid esters and the like. The method improves an atom utilization rate of a reaction in industrial nitration preparation of a nitro compound, and has atom economic characteristics of industrial preparation of a nitro compound.

The invention relates to the fields of photovoltaic or semiconductors, in particular to a method for inhibiting yellow smog during pickling of silicon materials. The main chemical components of the yellow smog are nitrogen oxides, such as nitric oxide, nitrogen monoxide, nitrogen dioxide and nitrogen tetroxide gas. The invention adopts the technical scheme that silicon material to be pickled is put in a mixed solution of mixed acid and strong oxidizer, wherein the mixed acid comprises hydrofluoric acid and nitric acid, or other inorganic acids or organic acids, and the strong oxidizer is a standard oxidant of which the electrode potential is higher than that of the nitric acid and can be hydrogen peroxide, potassium permanganate, manganese dioxide or ozone. By adopting the technical scheme, the quality for cleaning the silicon material cannot be influenced while the yellow smog is inhibited.

The invention discloses a manufacture method of a suede structure of crystalline silicon solar cells. The manufacture method comprises the following steps of (1) corroding a silicon wafer to be processed through acid liquor or alkali liquor and forming a micron-scale suede structure on the surface of the silicon wafer; and (2) conducting gaseous corrosion on the silicon wafer obtained in the step (1), further forming a nano-scale suede structure on the micron-scale suede structure. Gass for gaseous corrosion comprises nitric oxide gas, steam and hydrogen fluoride, and the nitric oxide gas is one or a plurality of nitric oxide, nitrogen dioxide and nitrogen tetroxide. The nano-scale suede structure is further formed on the micron-scale suede structure through the gaseous corrosion on the basis of the existing micron-scale suede structure, and surface reflectivity is further reduced.

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.

The invention relates to an oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer. The method comprises the following steps of oxidizing and absorbing the dinitrogen tetroixde waste gas with the molar content of 20 to 70 percent collectively through two levels of dilute nitric acid HNO3 and hydrogen peroxide H2O2 to obtain nitric acid, and then converting the nitric acid into potassium fertilizer by utilizing potassium hydroxide KOH alkali liquid. The method can be applied to the working condition that the waste gas pressure, concentration and flow rate are continuously varied, the absorption heat can be radiated in time by adopting large liquid spraying quantity and a kettle liquid cooling method, and a purpose of controlling the temperature can be realized. By adopting the oxidation absorption method, the technical bottle necks of rapidly oxidizing NO, reducing the contents of nitrous acid and nitrite and absorbing and radiating the heat can be broken through. The high-concentration dinitrogen tetroxide waste gas can be absorbed, the emission of toxic acid gas can be reduced, the air pollution can be prevented, and the environmental protection benefit is remarkable. The dinitrogen tetroxide waste gas is converted into the potassium fertilizer, so that waste is changed into treasure, the economic benefit is increased, the processing cost can be offset, and a novel way is provided for processing the tail gas of the nitric acid industry.

The invention provides a nitrogen tetroxide tail gas recycling system which comprises a receiver for receiving and conveying nitrogen tetroxide, wherein an exhaust end at the top end of the receiver is connected with a gas inlet end of a blender through an exhaust pipe, an air pipe and a nitrogen tetroxide tail gas pipe used for conveying the tail gas in nitrogen tetroxide production equipment are respectively connected on the blender, a gas outlet end of the blender is connected with a gas inlet end at the bottom of an absorption tower, a spraying water pipe is connected at the top end of the absorption tower, and a liquid outlet end at the bottom end of the absorption tower is connected with an acid storage tank. The nitrogen tetroxide tail gas recycling system fully uses a N2O4 production device and the N2O4 tail gas not completely utilized during loading and unloading and transferring, water and air are added to react sufficiently to produce dilute nitric acids the concentration of which is smaller than 68% and which meet different concentration requirements, in addition, the content of NO2 in the air is lower than 200PPM and reaches the emission standard, the purposes of saving energies and protecting environments are fulfilled, and the production cost is saved.

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 relates to treating dimazine or/and dinitrogen tetroxide combustion furnace. It includes heat resisting steel furnace body, burner, and chimney. The front of the furnace body is set burner joint and lighting up tuyere. The burner is fixed on the burner joint. Its middle is set secondary combustion nozzle joint. Its outer is set jacket. The front end jacket is set secondary air inlet. The secondary air inlet can reach the inner of the furnace. Its tail is set temperature measurement opening. The chimney is connected to the tail. Its upper and lower part is respectively connected to sensing hole and fire watching hole. The invention has the advantages of simple technique, convenient operation, safe and reliable, no secondary pollution, and the discharged tail gas is according with the country standard.

This invention discloses one nodularizer rare earth content testing method, which comprises the following steps: making test liquid and silicon, and the specimen liquid process steps are composed of aqua fortis and fluohydric acid specimen resolving, using boracic acid resolving over fluohydric acid to resolve the generated dinitrogen tetroxide by to process weak acid specimen liquid; the silicon process steps comprises the following steps: forming blue complex compound with azophosphon and rare earth element with largest absorption wavelength as 680nm with iron, titanium and calcium as mask with oxalic acid and with other metal element independent to measure the rare earth content by spectrophotometer.

Etch assisting agents for focused ion beam (FIB) etching of copper for circuit editing of integrated circuits both prevent loss of adjacent dielectric due to sputtering by the ion beam, and render sputtered re-deposited copper on adjacent surfaces non-conductive to avoid electrical short circuits. The agents comprise hydrazine and hydrazine derivatives having an N—N(N being Nitrogen) bonding in their molecules and boiling points between about 70° and 220° C., and NitrosAmine derivatives saturated with two hydrocarbon groups selected from Methyl, Ethyl, Propyl and Butyl. Preferred agents are Hydrazine monohydrate (HMH), HydroxyEthylHydrazine (HEH), NDMA, NMEA, NDEA, NMPA, NEPA, NDPA, NMBA or NEBA, alone or in combination with Nitrogen Tetroxide. The agents are effective for etching copper in high aspect ratio (deep) holes.

A rocket propulsion oxidizer compound that is a mixture that is a homogenous and stable liquid at room temperature that includes nitrous oxide and nitrogen tetroxide.

The invention provides a system and a process for condensing and recovering a nitrogen tetroxide waste gas resource, which belong to the field of waste gas treatment. The system comprises a condensingheat exchanger, a gas-liquid separator, an electric control valve, a condensate collecting tank, a low-temperature water chilling unit, and an ethylene glycol water solution buffer and expansion tank. A pipeline of waste gas containing nitrogen tetroxide steam enters the condensing heat exchanger; a gas-liquid mixture outlet pipeline of the condensing heat exchanger is connected with the gas-liquid separator; the gas-liquid separator is connected with the condensate collecting tank through a gas communicating pipe. In the system, the low-temperature water chilling unit provides a cooling capacity for cooling the temperature of an ethylene glycol water solution to the operating temperature, the ethylene glycol water solution cools the waste gas containing the nitrogen tetroxide steam through heat exchange so as to achieve a supersaturated state, and nitrogen tetroxide is recovered through gas-liquid separation. In the process, the ethylene glycol water solution is not only an intermediate heat transfer working medium but also a cold storage working medium, so that the system is ensured to operate stably.

The invention discloses a method and a device for disinfecting and sterilizing plastic packaging containers. According to the invention, the disinfecting and sterilizing purpose is achieved by performing photochemical reaction by virtue of sequentially adding 5-10mg/m<3> ethyl acetate, a nitrogen oxide composed of nitrous oxide, nitrogen tetroxide and nitrogen dioxide, 0.1-0.3% of ferrous and 35-45% of hydrogen peroxide to generate radical ions which have a strong oxidation property. The method and the device disclosed by the invention have the beneficial effects that the plastic packaging containers are disinfected and sterilized by generating the radical ions, without secondary pollution and plastic deformation, thus avoiding ageing due to the action of ultraviolet ray and prolonging the service life and time; the plastic packaging containers after being disinfected and sterilized by the radicals are free from water stain residue and good in effect.

The invention discloses a method for preparing nitrocompounds from nitrogen suboxides. Under the acceleration of molecular oxygen, nitrogen suboxides, such as nitrogen monoxide, nitrogen dioxide, nitrous oxide, nitrogen trioxide, nitrogen tetroxide and the like, reacts with alicyclic compounds, aromatic compounds and heterocyclics under the actions of heteropoly acid salts (such as aluminosilicate, phosphate aluminosilicate, sodium phosphomolybdate and the like), transition metal oxides, triphenylphosphine metal organic complexes and transition metal ion clay catalysts to obtain the nitrocompounds. The method disclosed by the invention is used for substituting the traditional industrial preparation method for preparing nitrocompounds from nitrogen pentoxide, nitric acid, nitrate, nitrate ester and other high-valence nitrogen (V) compounds; and the invention enhances the atom utilization ratio of the industrial nitrocompound preparation reaction by nitrification, and has the characteristic of atom economy in industrial preparation of nitrocompounds.

The invention belongs to the field of building and particularly relates to a high-rise building aviation warning light based on a reversible reaction principle. The warning light comprises a mountingbase which is fixedly mounted on the top of a high-rise building, wherein two supporting plates are fixedly connected with the upper surface of the mounting base; a shell is set above the mounting base; the shell is made of a transparent material; an LED light source is set in the shell; two sealing plates are in sealed slide connection with the inner side wall of the shell; an equilibrium state mixed gas of nitrogen dioxide and dinitrogen tetroxide is filled between the two sealing plates; and a threaded rod is rotationally connected with mutually distant ends of the two sealing plates. According to the warning light, light transmittance of the equilibrium state mixed gas of the nitrogen dioxide and the dinitrogen tetroxide in the shell is controlled according to the day and the night; eyesight of a pedestrian is prevented from being influenced by harsh glare which is emitted by the aviation warning light; moreover, a position of a solar panel can be adjusted; and maintenance frequency of the solar panel is effectively reduced.

The invention belongs to the field of new energy, and particularly relates to a scale-free heat collecting pipe for a solar water heater. The heat collecting pipe comprises a heat collecting pipe bodyfixedly communicating with a water storage tank, wherein a transparent cover pipe is arranged outside the heat collecting pipe body in a sleeving mode, the upper end of the transparent cover pipe isfixedly connected with the water storage tank, mixed gas of nitrogen dioxide and nitrogen tetroxide fills the transparent cover pipe, a movable plate is hermetically and slidably connected on the inner side wall of the transparent cover pipe, a rotating rod is arranged on the central axis of the heat collecting pipe body, one end of the rotating rod sequentially penetrates through the heat collecting pipe body and the movable plate, the rotating rod is rotationally and hermetically connected with the heat collecting pipe body, threads are arranged outside the rotating rod, the rotating rod isin threaded connection with the movable plate, a screw impeller is fixedly connected with the outside of the rotating rod in a sleeving mode, and two scrapers are fixedly connected with the side wallof the screw impeller. According to the heat collecting pipe, the formation of scale can be inhibited by controlling the temperature of a water body in the heat collecting pipe body, and the scale canbe scraped off through the scrapers, so that the influence from the scale on the heat exchange efficiency of the heat collecting pipe is effectively reduced.

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.

he invention discloses a method for preparing nitrocompounds from nitrogen suboxides. Under the acceleration of molecular oxygen, nitrogen suboxides, such as nitrogen monoxide, nitrogen dioxide, nitrous oxide, nitrogen trioxide, nitrogen tetroxide and the like, reacts with heterocyclics under the actions of heteropoly acid salts (such as aluminosilicate, phosphate aluminosilicate, sodium phosphomolybdate and the like), transition metal oxides, triphenylphosphine metal organic complexes and transition metal ion clay catalysts to obtain the nitrocompounds. The method disclosed by the invention is used for substituting the traditional industrial preparation method for preparing nitrocompounds from nitrogen pentoxide, nitric acid, nitrate, nitrate ester and other high-valence nitrogen (V) compounds; and the invention enhances the atom utilization ratio of the industrial nitrocompound preparation reaction by nitrification, and has the characteristic of atom economy in industrial preparation of nitrocompounds.

The invention relates to a chemical test method for a bipropellant thruster after thermal standard cleaning. The chemical test method of a burning path comprises the following steps: firstly, steady state and pulse mixed flushing and blowing are performed to methylhydrazine (fuel) difficult to clean away in a small flowing channel through isopropyl alcohol; sampling is performed on the isopropyl alcohol cleaning solution and the blowing gas to form gaseous sample and liquid sample of the burning path; the concentrations of the gaseous sample and the liquid sample are obtained through a standard solution concentration curve, so as to judge whether the burning path is cleaned out or not. An oxygen path adopts the same chemical test method. The chemical test method of he oxygen path comprises the following steps: cleaning and blowing are performed on nitrogen tetroxide (the oxygen path) through freon; then sampling is performed on the freon cleaning solution and the blowing gas; the concentrations of the freon cleaning solution and the blowing gas are measured through the same method (the standard solution concentration curve), so as to judge whether the oxygen path is cleaned out or not. According to the chemical test method, a chemical test can be performed on the engine of the bipropellant attitude and orbit control liquid-propellant rocket after thermal standard cleaning. Besides, the chemical test method can be taken as reference for the cleaning test methods of other chemical propulsion engines.

The invention discloses a spontaneous combustion liquid propellant composition. The spontaneous combustion liquid propellant composition comprises the following components which are separately stored: quadricyclane and an oxidizing agent which can be nitric acid, nitrogen tetroxide or hydrogen peroxide. The invention also discloses a spontaneous combustion liquid propellant composition comprising the following components which are separately stored: liquid hydrocarbon fuel containing quadricyclane, and oxidizing agent which can be nitric acid, nitrogen tetroxide or hydrogen peroxide. The spontaneous combustion liquid propellant disclosed by the invention uses the low-toxicity harmless quadricyclane fuel, thus being safer and more friendly to the environment than conventional hydrazine fuel and trinitride fuel.

The invention discloses a nitrogen dioxide gas standard substance in carbon dioxide. A preparation method of the nitrogen dioxide gas standard substance comprises the following steps: (1), measuring the purity of feed gas; (2), carrying out gas cylinder pretreatment; (3), diluting high-purity nitric oxide with high-purity carbon dioxide by adopting a weighing method, and then adding high-purity oxygen to prepare intermediate gas; (4), diluting the intermediate gas step by step by using high-purity carbon dioxide to prepare a nitrogen dioxide gas standard substance in the carbon dioxide; and (5), carrying out uniformity investigation and stability investigation on the prepared gas standard substance, and carrying out valuation on the gas standard substance. With the preparation method provided by the invention, formation of a nitrogen tetroxide dimer in the filling process and decomposition of nitrogen dioxide can be prevented effectively; the relative expansion uncertainty of the prepared nitrogen dioxide gas standard substance in the carbon dioxide is 2% (k=2); the uniformity and stability are good, the valid period is 12 months; and the requirements of food, medicine and other industries for detection and traceability of the nitrogen dioxide contents in carbon dioxide products can be met.

The invention belongs to the field of security monitoring, and in particular relates to a self-adjusting security camera based on a reversible reaction principle. The self-adjusting security camera comprises a base fixedly mounted on a building, a camera is mounted at the lower end of the base; a hemispherical inner transparent cover and a hemispherical outer transparent cover are arranged outsidethe camera in a surrounding mode. The outer transparent cover is arranged outside the inner transparent cover in a sleeving manner; the inner transparent cover and the outer transparent cover are both fixedly connected with the base. A plurality of conducting rings of which the diameters are gradually reduced from top to bottom are fixedly arranged between the inner transparent cover and the outer transparent cover; the conducting rings are made of indium tin oxide materials, the space between the inner transparent cover and the outer transparent cover is divided into a plurality of annular light-transmitting cavities by the conducting rings, and the annular light-transmitting cavities are filled with nitrogen dioxide and nitrogen tetroxide mixed gas. The area of a dark area of the annular light-transmitting cavities from top to bottom can be adjusted according to the illumination intensity, so that background illumination is automatically adapted, the visual field is sacrificed as little as possible, and the definition of an image area is improved.

A metallic composite inorganic source with the formula: (ZrxTiy)(NO3)4, (HfxTiy)(NO3)4, where x+y=1, x=0.1-0.9 and y=0.1-0.9, is prepared from TiCl4 and anhydrous ZrCl4 or HfCl4 through reaction between said metal chlorides and N2O4 in the cold trap of liquid N2, removing residual NOx to obtain white powder, sublimating at 100-120 deg.C to generate white crystals on the container's wall at -20-0 deg.C, and removing residual Nox.

The present invention relates to a first-aid medicine for curing nitrogen oxide poisoning-an aerosol, its application and preparation method. Its raw material comprises beta 2 receptor excitant, anticholinergic, glucocorticoid hormone and mucusal protection agent, it can be effectively used for preventing and curing the chemical injury of larynx, trachea, bronchus, pulmonary alveoli, lymphatic vessel and blood vessel due to aspiration dinitrogen tetroxide and its harmful product poisoning, and can relieve or eliminate the diseases of exudate increment of respiratory system, bronchospasm, pneumonedema and respiratory dysfunction, etc. resulted from chemical pneumonia. Said invention aerosol also can be used for curing asthma.