112 results about "Unsymmetrical dimethylhydrazine" patented technology

The invention relates to precious metal-doped ZnO nanoscale particles and a use thereof. The precious metal-doped ZnO nanoscale particles are ZnO/Ag and ZnO/Pd nanoscale particles which are prepared from zinc acetate, sodium hydroxide, silver nitrate and palladium chloride by an ethanol auxiliary hydrothermal method, wherein the diffraction peak of ZnO belongs to a hexagonal wurtzite structure; a space crystal group of ZnO belongs to P63mc(186); a point lattice constant a of ZnO is equal to a point lattice constant b of ZnO and is equal to 0.3249nm; a point lattice constant c of ZnO is equal to 0.5205nm; the diffraction peak of Ag is in accordance with a standard map JCPDF:87-0717; a space crystal group of Ag belongs to Fm-3m(225); a point lattice constant a of Ag is equal to a point lattice constant b of Ag, is equal to a point lattice constant c of Ag and is equal to 4.086nm; the diffraction peak of Pd is in accordance with a standard map JCPDF:88-2335; a space crystal group of Pd belongs to Fm-3m(225); and a point lattice constant a of Pd is equal to a point lattice constant b of Pd, is equal to a point lattice constant c of Pd and is equal to 3.900nm. The use of the precious metal-doped ZnO nanoscale particles comprises that the precious metal-doped ZnO nanoscale particles are utilized as a photocatalyst for unsymmetrical dimethylhydrazine wastewater degradation. Compared with the prior art, the precious metal-doped ZnO nanoscale particles have good morphology and a high degree of crystallization; a preparation method of the precious metal-doped ZnO nanoscale particles is simple and has good repeatability; a result of a test shows that the precious metal-doped ZnO nanoscale particles can be degraded faster and more thoroughly under sunlight; and the precious metal-doped ZnO nanoscale particles have a lower production cost, better energy-saving effects and a certain referential meaning for industrial application.

The invention discloses a method for treating organic wastewater by a photoelectric combined technique. A photocatalyst and three-dimensional electrodes are synergically utilized to treat organic wastewater, wherein the main anode is a boron-doped diamond film electrode, the main cathode is stainless steel, and the filled particle electrode material is composed of carbon nano fibers and calcium alginate microspheres. The catalyst generates holes with strong oxidizing property under the light irradiation; the high-catalytic-activity three-dimensional electrode materials are combined to generate higher oxygen overpotential and generate active oxygen substances (such as hydroxy free radical -OH, H2O2, -OOH, -O and the like); C-N, N-N, N=O and other bonds in toxic and nondegradable wastewater containing unsymmetrical dimethylhydrazine, nitrosodimethylamine and the like are ruptured and efficiently degraded into carbon dioxide, water, ammonium salt NH4<+> and the like; and COD (chemical oxygen demand) in the wastewater is greatly removed under neutral room-temperature conditions. The method has the advantages of high efficiency of combined oxidation treatment and no secondary pollution, and is an efficient method for treating nondegradable wastewater.

The invention discloses a treatment method for unsymmetrical dimethylhydrazine-containing wastewater. The treatment method comprises the following steps: (1) adding hydrogen peroxide and a solid catalyst into the unsymmetrical dimethylhydrazine-containing wastewater, feeding air or oxygen, reacting, and performing solid-liquid separation; (2) adjusting the pH of the wastewater to be 5 to 9, and adding chlorine-containing oxidant into the wastewater for reacting for 5 to 30 minutes, wherein the hydrogen peroxide and the unsymmetrical dimethylhydrazine are in the molar ratio of (0.2-11):1, and the chlorine-containing oxidant and the unsymmetrical dimethylhydrazine are in the molar ratio of (11-0.2):1. Compared with a pure chlorine-containing oxidant oxidation method or a pure hydrogen peroxide oxidation method, the method disclosed by the invention has a good treatment effect, the treatment is thorough, the time is short, the using amount of the chorine-containing oxidant is greatly reduced, and the secondary pollution of a water body is reduced.

The invention discloses a multi-metal oxygen-group catalyst for unsymmetrical dimethylhydrazine degradation and a preparation method and application thereof. The catalyst disclosed by the invention is shown as a general formula MO-MnOx-Y, wherein M represents at least two metals in transition metals and/or rare earth metals, Y represents a natural porous carrier, a weight ratio of MO to Y is (0.5-5) to 100, a weight ratio of MnOx to Y is (2-4) to 100, and x is 1-2. The catalyst has the advantages of improving the surface dispersity, activity and stability of active ingredients, being capable of catalyzing hydrogen peroxide to decompose to generate hydroxyl radicals OH and to further break chemical bonds of C-N and N-N of unsymmetrical dimethylhydrazine, being safe and efficient, and causing small secondary pollution. The catalyst provided by the invention is prepared by a precipitation oxidation method. The catalyst provided by the invention is applied to catalytic degradation of high-concentration unsymmetrical dimethylhydrazine waste water, equipment used in a degradation process is simple in structure, ingenious in design and low in operation cost and the safety in a degradation process is high.

The invention discloses a method for quickly and efficiently degrading high-concentration unsym-dimethylhydrazine (UDMH) wastewater. The method comprises the following steps: performing catalytic oxidation on H2O2 by use of a nano sandwich-structured iron-based catalyst and a hydrogen peroxide stabilizer to produce a hydroxyl free radical (.OH); quickly and efficiently degrading UDMH and derivatives thereof. The catalyst is coupled with the free radical for reaction, the practicability is high, COD in UDMH wastewater can be greatly removed at a relatively low temperature and within a relatively wide pH range, and high-toxic UDMH is oxidized into ammonium salt NH4<+>, HCHO, CO2 and the like. The method can efficiently and quickly degrade high-concentration UDMH wastewater, the hydrogen peroxide utilization efficiency can be remarkably improved after the hydrogen peroxide stabilizer is added, the adding amount of hydrogen peroxide is reduced and the treatment effect is improved.

A dipped activated carbon for preventing acidic toxic gas is prepared through proportionally mixing the solution of copper ammonium carbonate with carbonate of alkali metal, silver nitrate and ammonia water to obtain a liquid mixture, dipping activated carbon in it, and drying.

The invention provides a preparation method of a three-dimensional macroporous carbon/carbon nanotube/titanium dioxide/silver composite material capable of catalytically degrading unsymmetrical dimethylhydrazine, relating to the technical field of environment. The preparation method comprises the following steps: carrying out carbon nanotube dispersion solution and phenolic resin solution deposition and carbonization activation by using a polymer foam template to prepare a three-dimensional macroporous carbon nanotube/activated carbon composite foam material, and modifying a silver-doped titanium dioxide nanoparticle layer on the surface. The used materials are green and environment-friendly. The preparation method is simple. The structure is firm. The macropores are beneficial to multi-azimuth lighting and water body circulation; the mesopores are beneficial to adsorbing unsymmetrical dimethylhydrazine; and the silver-doped titanium dioxide nanoparticles can photocatalytically degrade the unsymmetrical dimethylhydrazine. Thus, the composite material is hopeful to become a novel green water treatment material capable of photocatalytically degrading unsymmetrical dimethylhydrazine at high efficiency.

The invention relates to a hydrogen peroxide-ozone-ultraviolet joint treatment method for unsymmetrical dimethylhydrazine sewage. According to the method, the unsymmetrical dimethylhydrazine sewage and hydrogen peroxide are mixed according to the substance amount ratio of 4:1 to 6:1, after stirring pretreatment is performed for 24 hours through oxygen blowing, ozone and ultraviolet are used for performing oxidization treatment, the degradation rate of unsymmetrical dimethylhydrazine can reach 99.999% or above after oxidization treatment, and a treated product meets the requirement of the national spaceflight propellant water pollutant discharging standard. The treatment method for the unsymmetrical dimethylhydrazine sewage is high in efficiency, thorough in treatment, good in economic performance and low in energy consumption.

The invention discloses a continuous device for gasifying unsymmetrical dimethylhydrazine waste liquid with supercritical water. The device comprises an unsymmetrical dimethylhydrazine storage tank, a mixer, a water tank, a preheating system and a reactor, wherein the outlet of the unsymmetrical dimethylhydrazine storage tank is connected with the first inlet of the mixer; the outlet of the water tank is connected with the second inlet of the mixer; the outlet of the mixer is connected with the inlet of the reactor, the water in the reactor is supercritical and the supercritical water and unsymmetrical dimethylhydrazine are reacted in the reactor for recycling. Compared to a kettle-type reactor, by the continuous device for gasifying unsymmetrical dimethylhydrazine waste liquid with supercritical water, the temperature of the reaction materials can be rapidly raised to a predetermined temperature, the carbon gasification rate and COD removal rate are further increased and the concentration of ammonia nitrogen in produced liquid is reduced.

The invention provides a method for removing dimethylamine in the unsymmetrical dimethylhydrazine wastewater treatment process, and belongs to the technical field of wastewater treatment. The method for removing dimethylamine in the unsymmetrical dimethylhydrazine wastewater treatment process comprises the following steps: mixing a Fenton reagent with unsymmetrical dimethylhydrazine wastewater, adjusting the pH value to 2.5-6, and carrying out first Fenton treatment to obtain a treated crude solution; and adjusting the pH value of the treated crude liquid to 6-8, then mixing the treated crudeliquid with a hydrogen peroxide solution, carrying out second Fenton treatment on the obtained treated crude liquid-hydrogen peroxide mixed solution, and discharging the obtained second Fenton treatment solution after the concentration of dimethylamine in the obtained second Fenton treatment solution is lower than 5.0 mg/L. According to the removal method provided by the invention, unsymmetrical dimethylhydrazine and nitrosodimethylamine and unsymmetrical hydrazone generated in the treatment process can be thoroughly removed through first Fenton treatment, the concentration of dimethylamine can be reduced to less than 5.0 mg/L through the second Fenton treatment, the risk of converting dimethylamine into a high carcinogen nitrosodimethylamine is reduced, and the process is simple.

The invention provides a copper-based three-dimensional graphene material and a method for treating unsymmetrical dimethylhydrazine wastewater by using the same, so as to solve the environmental pollution problem caused by unsymmetrical dimethylhydrazine wastewater. The copper-based three-dimensional graphene material includes: preparing a graphene oxide stock solution; adding copper salt to the graphene oxide stock solution; ultrasonically treating the mixed solution; heating the mixed solution at a constant temperature; dehydrating to form a copper-based three-dimensional graphene material . The present invention utilizes the copper-based three-dimensional graphene composite material to treat unsymmetrical dimethylhydrazine wastewater, not only because of the hydrophobic environment inside the three-dimensional graphene and the huge specific surface area, there is a very large adsorption capacity, more importantly, it can be combined with metal ions Composite, the synergistic effect of the two can be brought into play, and at the same time of adsorption, it can also catalyze and decompose unsymmetrical dimethylhydrazine under light conditions, so that the purpose of completely eliminating its pollution can be achieved.

The invention provides a preparation method of an anti-yellowing agent HN-150. The preparation method comprises the following steps: respectively dissolving unsymmetrical dimethylhydrazine and diphenyl methane diisocyanate in an organic solvent while stirring, mixing, filtering, washing, drying and the like to obtain a final product. The preparation method provided by the invention has the advantages that the operation is simple, raw materials are low in price, a process is simple and convenient, the environmental pressure is small, the product is high in yield and purity, and the like.

A process for effectively treating the sewage containing the propellant of spacercraft includes such steps as using high-pressure metering pump to raise the pressure of said sewage to 28-30 MPa, preheating it to 350-370 deg.c, mixing it with O2 under 28-30 MPa in a high-pressure reactor, quickly heating the mixture to 500-550 deg.C and decomposing reaction for 95 seconds to decompose the toxic C2N2H8 by more than 99.99%. Its advantages are high efficiency and effect, less energy consumption and low cost.

The invention discloses an unsymmetrical dimethylhydrazine wastewater treatment method which comprises the following steps: (1) adding one or more condensation agents into unsymmetrical dimethylhydrazine wastewater for a hybrid reaction, wherein the condensation agents comprise an aldehyde, a ketone and/or a saccharide; (2) after the hybrid reaction in the step (1) is finished, adding an adsorption agent into the unsymmetrical dimethylhydrazine wastewater for adsorption treatment. Compared with the conventional method for adsorbing unsymmetrical dimethylhydrazine by use of activated carbon, the unsymmetrical dimethylhydrazine wastewater treatment method has the advantages that after the aldehyde, the ketone and/or the saccharide is/are added into the unsymmetrical dimethylhydrazine wastewater, not only can the unsymmetrical dimethylhydrazine adsorption capability of the adsorption agent be remarkably improved to achieve more thorough treatment of unsymmetrical dimethylhydrazine in wastewater, but also extraction and filtration methods can be properly utilized for reducing the usage amount of the adsorption agent.

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.

The invention discloses a quick estimation method for unsymmetrical dimethylhydrazine diffusion concentration distribution in a long-storage warehouse. The method is suitable for quick estimation of concentration distribution after propellant leakage and diffusion in a closed space. According to the quick estimation method for unsymmetrical dimethylhydrazine diffusion concentration distribution inthe long-storage warehouse, first, through a reasonable hypothesis, an established unsymmetrical dimethylhydrazine concentration distribution basic calculation formula is simple and practical; second, the influences of four situations, where leakage is most possible to occur, on the leakage rate are fully considered, wherein the four situations include gas leakage above a liquid level in a storage tank, liquid leakage below the liquid level in the storage tank, hole leakage caused by damage to a valve and a pipeline and leakage at the connection position of the valve and the pipeline or the storage tank; third, based on a large amount of numerical simulation data, an average wind speed calculation model is determined; and last, the influences of different areas in the long-storage warehouse on diffusion parameters are fully considered. Through the method, unsymmetrical dimethylhydrazine gas concentration distribution in the warehouse can be quickly estimated according to alarm data ofan unsymmetrical dimethylhydrazine gas sensor in the long-storage warehouse; and the method is simple, easy to implement and small in error.

The invention discloses a method for gasifying unsymmetrical dimethylhydrazine waste liquor through supercritical water. The method comprises the following steps of adding an unsymmetrical dimethylhydrazine water solution to a reaction kettle; heating a temperature-controlled electric furnace, and carrying out leakage detection on the reaction kettle by using high-pressure argon at the same time; after the temperature inside the temperature-controlled electric furnace reaches preset temperature and is stable, placing the reaction kettle into the temperature-controlled electric furnace for heating; controlling and regulating the heating power of the temperature-controlled electric furnace by utilizing a K-shaped armoured thermocouple inside the temperature-controlled electric furnace so as to change the heating rate inside the reaction kettle; after the temperature inside the reaction kettle reaches the preset temperature, keeping constant temperature, and reacting unsymmetrical dimethylhydrazine with supercritical water which is positioned in the reaction kettle and heated and pressurized to a supercritical state; after the reaction is finished, taking the reaction kettle out of the temperature-controlled electric furnace, and reducing to room temperature; and opening a gas collecting valve to collect a gaseous sample to complete the gasification of the unsymmetrical dimethylhydrazine waste liquor. The process can be carried out in a continuous supercritical water fixed bed device or an intermittent reaction kettle. A device is simple in structure, low in operation cost and high in COD removal rate.

The invention discloses an unsymmetrical dimethylhydrazine decontamination apparatus and an unsymmetrical dimethylhydrazine decontamination method. The apparatus comprises a powdery decontaminant storage tank and a decontaminant injection system, the decontaminant injection system is connected with the powdery decontaminant storage tank, the injection system comprises a pneumatic powder conveying device and a gas source device, one end of the pneumatic powder conveying device is connected with the material conveying opening of the powdery decontaminant storage tank, and the other end of the pneumatic powder conveying device is connected with the gas source device through a gas conveying pipeline. The gas source device and the powder conveying pump are used to inject an unsymmetrical dimethylhydrazine decontaminant in order to meet application of the powdery decontaminant and realize soft powder conveying of the pneumatic powder conveying device and increase of the decontamination efficiency; and gas pressure used as a power source is suitable for various working conditions, and overcomes the disadvantages of unable use of a liquid decontaminant in environment with the temperature being less than a freezing point in the prior art, surrounding environment pollution easily caused by pollutant flowing around in the decontamination process, enlarged pollution area, and difficulty in decontamination of charged environment and precious instrument environment.

The invention discloses an ochrobactrum anthropi M11 for degrading unsymmetrical dimethylhydrazine and a method for degrading the unsymmetrical dimethylhydrazine by using the ochrobactrum anthropi M11. The method comprises the steps of: inoculating a strain of the ochrobactrum anthropi M11 to a slant culture medium, and culturing to obtain a slant culture product; inoculating the slant culture product into a container in which a seed culture medium is arranged, and culturing to obtain a seed liquid; immobilizing the seed liquid to obtain immobilized mycelial pellets; and inoculating the immobilized mycelial pellets into a container in which a substrate solution is filled according to an inoculation amount of 10-30%, mixing, and degrading for 72 hours at a temperature of 30-37 DEG C and the oscillation rate of 120-200r/min, wherein the inoculation amount is calculated based on the volume proportion of the seed liquid to the substrate solution. According to the invention, the degrading rate for the unsymmetrical dimethylhydrazine is high up to 97.7%.

The invention provides an optical detector for multi-component gas in a closed or semi-closed space, the quality of the ambient air in the closed or semi-closed space is detected in real time by adopting a spectral analysis method, so that the optical detector has higher technical advancement and scientificity compared with the conventional measurement by adopting an electrochemical method. The problems of low measurement precision, short service life, long recovery time, poor poison and overload resistance, inconvenience in maintenance and the like of the conventional instrument are solved. Multiple technologies such as an infrared spectrum technology, an ultraviolet spectrum technology and an array sensing technology are fused, complemented with one another and complemented with one another, so that the detection resolution is improved, the detection types and capabilities of the detector are expanded, and the detection sensitivity of the detector is improved. Carbon monoxide, nitric oxide, carbon dioxide, oxygen, methane, sulfur dioxide, unsymmetrical dimethylhydrazine, hydrogen sulfide and volatile organic compound gas can be qualitatively, quantitatively and accurately detected on line at the same time.

The invention discloses a preparation method of mildronate, belonging to the technical field of chemical synthesis. The preparation method is characterized by comprising the following steps: adding benzyl acrylate in a flask, cooling to 0-20 DEG C; dropping excessive 5-50% of unsymmetrical dimethyl hydrazine, performing reduced pressure distillation to obtain 3-(2,2-dimethylhydrazine)benzylpropionate; dissolving the product of distillation with ethanol; passing through or dropping excessive 5-30% of methylating agent, washing with cold ethanol to obtain 3-(2,2,2-trimethylhydrazine)benzylpropionate; dissolving the benzyl ester salt in water, pouring the solution in an autoclave, adding hydrogenation catalyst to stand for 2-5 hours; filtering the catalyst, reducing pressure to remove the solvent water; adding solvent and organic amine in the residue, filtering, and recrystallizing the solid with 95% ethanol to obtain the target product. The preparation method of the invention adopt the hydrogenolysis to replace the alkaline hydrolysis in the prior art so that alkali is not needed to use and the method does not have residual metal ions; and a small amount of alkali is used for neutralization and the solvent is easy to remove after neutralization, thus the obtained product has high purity.

The catalyst for treating waste unsym-dimethylhydrazine includes one or several of Pd, Pt and Rh as active component; one or several of IA, IIA, IIIB, VIII and RE elements as assistant; and Al2O3 or SiO2 as carrier. The preparation process includes the main steps of: soaking the carrier with solution containing the active component and assistant; drying and roasting the soaked carrier. The soaking step may be one of carrying active component before carrying assistant or one of carrying active component after carrying assistant. The catalyst may be used in the innocuous treatment of catalytically burning waste unsym-dimethylhydrazine or other hydrazine propellant. The addition of the assistant can improve the reaction and stabilizing performance of the catalyst effectively, and the carrier in the catalyst can raise the utilization of noble metal material effectively.

The invention relates to a synthetic process for a yellow inhibitor HN-130. The synthetic process comprises the following steps: 1) preparation of reaction raw materials and dissolving of the materials, wherein the raw materials comprise HDI, unsymmetrical dimethylhydrazine and a polar solvent, a mass ratio of HDI to unsymmetrical dimethylhydrazine is 100: 70-76, mass percent of a solvent in the polar solvent is no less than 97%, and mass percent of water in the solvent is no more than 1%; 2) synthesis; 3) discharging: a step of separating reactants with a separator and collecting a solid so as to obtain a yellow inhibitor HN-130 containing a trace amount of the solvent; and 4) oven-drying: a step of drying the yellow inhibitor HN-130 containing a trace amount of the solvent obtained in step 3) with a vacuum drying device at a temperature below 60 to 110 DEG C for 4 to 8 h so as to obtain the yellow inhibitor HN-130. The synthetic process provided by the invention overcomes the problem of incapability of stable production of the yellow inhibitor HN-130 in the prior art; the polar solvent is used as a solvent in the invention to substitute toluene in the prior art, so the risks of burning and explosion caused by static electricity during centrifugal discharging are reduced.