26results about "Hydrazine" patented technology

The invention relates to the field of hydrazine hydrate, in particular to an efficient and green hydrazine hydrate synthesis method. The efficient and green hydrazine hydrate synthesis method comprises the following steps: mixing chlorine, sodium hydroxide and water, and reacting to obtain a sodium hypochlorite solution; the method comprises the following steps: mixing a sodium hypochlorite solution, urea and a catalyst, and reacting to obtain hydrazine hydrate, tail gas and a byproduct; and tail gas and by-products are recovered. Through mechanism-driven process design, high efficiency, greenization and economy of hydrazine hydrate synthesis are realized, and a sustainable solution is provided for industrial application.

The invention provides hydrazine hydrate and a preparation method thereof, and relates to the technical field of synthesis processes of nitrogen-containing compounds. According to the invention, sodium hypochlorite is atomized and dispersed into fine liquid drops to form a tiny reaction unit, so that the sodium hypochlorite is instantaneously and completely reacted with excessive ammonia gas without backmixing; the two-stage condensation design is adopted, so that uniform contact and thorough separation of materials are ensured, the side reaction that the product hydrazine hydrate is oxidized by sodium hypochlorite is effectively avoided, and meanwhile, the yield of the hydrazine hydrate can reach 90% or above and is far higher than that of a traditional Raschig method by 60%-70%; the mass concentration of the generated hydrazine hydrate can reach 5%-15%, and is obviously higher than 1%-2% of a Raschig method and 2%-4% of a urea method; due to the high-concentration product, the energy consumption in the subsequent evaporation and concentration process is greatly reduced; the whole technological process of the method is high in continuity degree, operation parameters are easy to control, and the method is suitable for industrial large-scale production.

The invention provides a hydrazine hydrate separation and purification method. The hydrazine hydrate separation and purification method comprises the following steps: carrying out first pretreatment or second pretreatment on a crude hydrazine solution according to the ratio k of the mass concentration of sodium carbonate to the mass concentration of sodium chloride in the crude hydrazine solution to obtain pre-separated concentrated water and pre-separated produced water; performing nanofiltration treatment on the pre-separated produced water for M times to obtain first concentrated water and first produced water; performing F times of reverse osmosis treatment on the first produced water to obtain second concentrated water and second produced water; concentrating and rectifying the second produced water to obtain a target solution. According to the technical scheme provided by the invention, the problem that the production cost of hydrazine hydrate is relatively high when hydrazine hydrate is separated and purified by adopting the prior art can be solved.

The invention provides a preparation method of hydrazine hydrate, which comprises the following steps: in the presence of a catalyst and under reaction conditions, introducing methyl ethyl ketazine and water into a reaction section of a composite rectifying tower for contact reaction, and then continuously producing a hydrazine hydrate solution from a tower kettle. The preparation method of hydrazine hydrate provided by the invention can catalytically hydrolyze methyl ethyl ketazine under low-temperature and low-pressure reaction conditions, and meanwhile, the concentration and yield of hydrazine hydrate are improved.

The utility model discloses a recycling device for mother liquor in carbazide production, and relates to the technical field of carbazide production, an inlet of a distillation kettle is communicated with a mother liquor tank, an outlet of the distillation kettle is communicated with a crystallizing tank through a pipeline, and an outlet of the crystallizing tank is communicated with a first centrifugal machine; and a solid phase outlet of the first centrifugal machine is communicated with a hydrazine crystal tank. The mother liquor is distilled by the distillation kettle, and moisture and low-boiling-point impurities in the mother liquor are evaporated by heating, so that primary concentration and component separation of the mother liquor are realized, and a proper concentration condition is created for subsequent crystallization. And the concentrated mother liquor in the crystallizing tank is cooled and the like, and the carbazide reaches a supersaturated state so as to be crystallized and separated out. The first centrifugal machine is used for separating carbazide crystals formed in the crystallizing tank from mother liquor, and the solid phase outlet is connected with the carbazide crystal tank, so that the carbazide crystals are preliminarily recovered, the whole process is coherent, and basic operation from mother liquor to preliminary recovery of the carbazide crystals is reasonably realized.

This invention discloses a nitrogen-doped carbon-coated ternary nanoneedle array material, its preparation method, and its application in the electrolysis of hydrazine hydrate, belonging to the field of energy catalysis technology. The material comprises a substrate, a ternary nanoneedle array grown on the substrate surface, and a nitrogen-doped carbon material supported on the ternary nanoneedle array and the substrate surface; the ternary nanoneedles are composed of any three of iron, cobalt, copper, nickel, and manganese. This invention proposes an NC-supported ternary nanoneedle array, where NC and the ternary nanoneedle array synergistically achieve enrichment of active sites and enhancement of intrinsic activity, effectively improving the conductivity of the ternary nanoneedle array. For hydrogen evolution reaction and oxygen evolution reaction, electrons can be rapidly transferred between the catalyst surface and reaction intermediates, thereby accelerating the reaction rate. Simultaneously, this coating structure, by adjusting the adsorption energy, makes it easier for water molecules to be adsorbed and activated on the catalyst surface, thus promoting HzOR catalytic activity.

The present application relates to the field of hydrazine hydrate, and particularly relates to a method for efficiently and greenly synthesizing hydrazine hydrate. The method for efficiently and greenly synthesizing hydrazine hydrate comprises the following steps: mixing chlorine, sodium hydroxide and water, and performing a reaction to obtain a sodium hypochlorite solution; mixing the sodium hypochlorite solution, urea and a catalyst, and performing a reaction to obtain hydrazine hydrate, tail gas and by-products; and recycling the tail gas and the by-products. Through mechanism-driven process design, the method realizes the efficiency, greenness and economy of hydrazine hydrate synthesis, and provides a sustainable solution for industrial application.

The application discloses a method for recycling fine-crystal medicaments generated in a nickel hydrazine nitrate combination process, and belongs to the field of initiating explosive devices and explosive medicaments, and comprises collection of the fine-crystal medicaments and granulation of the fine-crystal medicaments; under the premise that the combination process and device of the nickel hydrazine nitrate are not changed, the fine-crystal nickel hydrazine nitrate is recycled through the crystallization collection technology and the secondary granulation technology, the yield of the nickel hydrazine nitrate is improved, the waste gas produced in the waste medicament destruction process is eliminated, and the environmental protection is improved; the obtained granulated nickel hydrazine nitrate is detected by using a particle size analyzer, and the particle size distribution of the granulated nickel hydrazine nitrate is as follows: 20 mesh to 40 mesh particles account for about 30% of the product, 40 mesh to 60 mesh particles account for about 35%, and 60 mesh to 100 mesh particles account for about 35%, so that the particle size distribution is relatively uniform.

The invention provides a method for realizing photoelectrocatalytic synthesis of hydrazine hydrate by using trace copper ions. According to the method, under the synergistic effect of trace copper ions and imine molecules, the photoelectric property of the photo-anode is remarkably improved, so that an efficient N-N bond coupling reaction is driven, and a corresponding azo compound is generated; and performing hydrolysis reaction to obtain hydrazine hydrate. According to the invention, photo-generated holes are used as a green oxidizing agent, so that expensive hydrogen peroxide or sodium hypochlorite which is high in environmental harm in the traditional process is avoided, and the reagent cost and environmental pollution are remarkably reduced. Meanwhile, the method has the advantages of normal-temperature and normal-pressure operation, strong reaction controllability, high safety and the like, and effectively overcomes the problems of harsh reaction conditions, more side reactions, low product selectivity and the like in the prior art. The system has excellent photoelectric performance and good amplification performance, light current output as high as 409 mA is achieved in an amplification experiment, the hydrazine hydrate generation rate reaches 6069 micromoles h <-1 >, and the high current efficiency of 93% is kept.

This invention provides a method for separating sodium carbonate and sodium chloride from crude hydrazine. The method includes the following steps: treating the crude hydrazine solution by electrodialysis, reverse osmosis, and / or nanofiltration to separate sodium carbonate and sodium chloride from the crude hydrazine. The method of this invention is simple, has a short process flow, introduces no impurities, is easy to operate, allows for easy control of operating parameters, and has low energy consumption. Multiple separations of sodium carbonate and sodium chloride from hydrazine hydrate improve the separation efficiency of impurity salts and the purity of hydrazine hydrate, yielding a pure hydrazine hydrate solution and high-purity sodium carbonate and sodium chloride. Furthermore, the process uses a full membrane system, eliminating the need for added reagents and avoiding environmental pollution and equipment corrosion.

The invention relates to a process for preparing hydrazine hydrate, comprising the following successive steps:a) preparation by means of an absorption column of an aqueous solution comprising dissolved ammonia and comprising at least one activator, by introduction into the absorption column of an aqueous solution comprising at least one activator and of fresh ammonia, thenb) reaction within at least one reactor of the aqueous ammonia solution comprising at least one activator obtained in the preceding step with hydrogen peroxide and a ketone, thenc) separation of the organic phase containing the azine from the aqueous phase from the stream formed on conclusion of the preceding step, thend) hydrolysis of the organic phase obtained in the preceding step to obtain hydrazine hydrate.

A biological material complex is described herein. In some embodiments, the biological material complex includes a solid surface having a terminal hydrazine that is available to bind to a functional group of a biological material. Applications, uses, and variations of the disclosed complex include, but are not limited to, separating, purifying, and labeling biological materials.

The present application relates to the process of impurity decomposition and recycling of hydrazine hydrate, in particular to a method for removing impurities of hydrazine hydrate by hydrogen peroxide method. The dilute hydrazine hydrate produced by the hydrogen peroxide method is concentrated, and the feed is added from the feed position of the catalytic reaction rectifying tower with hydrolysis catalyst, and the impurities are hydrolyzed to remove the impurities in the preparation of hydrazine hydrate by the hydrogen peroxide method. The present application is simple to operate, and has good process stability. The removal rate of 2,3-butanedione dihydrazone reaches more than 98%, and the hydrazine hydrate is generated by hydrolysis of 2,3-butanedione dihydrazone. The yield of hydrazine hydrate is 100.5%, and good economic benefits are obtained.

The invention relates to a method for preparing hydrazine hydrate, which comprises the following successive steps: a) preparing, by means of an absorption column, an aqueous solution containing solubilised ammonia and containing at least one activator, by introducing an aqueous solution comprising at least one activator and fresh ammonia into the absorption column; then b) reacting, inside at least one reactor, the aqueous ammonia solution containing at least one activator obtained in the preceding step with hydrogen peroxide and a ketone; then c) separating the azine-containing organic phase of the aqueous phase from the stream formed as a result of the preceding step; and then d) hydrolysing the organic phase obtained in the previous step to obtain hydrazine hydrate.

The utility model relates to a device for separating liquid containing methanol, water, hydrazine hydrate and toluene. The device comprises a first rectifying tower, a water washing tower, a second rectifying tower, an evaporator and a third rectifying tower, wherein the top of the first rectifying tower is connected with the bottom of the washing tower; the first rectifying tower kettle is connected into the second rectifying tower, the second rectifying tower kettle is connected with the evaporator, and an outlet of the evaporator is connected with an inlet of the third rectifying tower; a bottom discharge hole of the water washing tower is connected with an inlet of the first rectifying tower. The tops of the first rectifying tower, the second rectifying tower and the third rectifying tower are respectively provided with a condenser, a return tank and a delivery pump which are sequentially connected. The evaporator is used for reduced pressure evaporation, high-boiling-point impurities (o-chlorotoluene and other high-boiling-point impurities) in the mother liquor are discharged through residual liquid due to difficulty in vaporization, and hydrazine hydrate and the high-boiling-point impurities are separated from the evaporated and refined materials. The device has the characteristics of simplicity in operation, no introduction of a third component, high separation efficiency, good safety, equipment stability and the like.

The utility model discloses a device of recycling hydrazine hydrate, with the system device of the pressure -reducing rectification mechanism, condensation water separation mechanism and cyclic collection mechanism composition carries out the process of feeding distillation, condensation water separation, cyclic collection. The utility model discloses through low -temperature pressure -reducing rectification avoids the decomposition explosion of hydrazine hydrate under high temperature, and the process safety is significantly promoted. By introducing the rectifying column after the stratification toluene, the entrainment of hydrazine hydrate in the steam-out liquid is reduced, the hydrazine hydrate residual quantity in the stratified wastewater is further reduced, more than 80% of the traditional method is reduced, and the hydrazine hydrate recovery rate is significantly improved. The water separation mechanism automatically separates toluene and wastewater, and the degree of automation is high. The stratified toluene is recycled, the raw material cost is reduced, the wastewater is directly discharged after reaching the standard, the subsequent sewage treatment cost is reduced, and it is more economic and environmental protection.

The application specifically discloses a method for recycling hydrazine hydrate, which comprises the steps of primary neutralization, hydrazine removal, secondary neutralization and separation and purification, etc. The hydrazine hydrate mother liquor containing impurities such as hydrazinium chloride and organic matters is first neutralized by sodium hydroxide, and the hydrazinium chloride is converted into hydrazine hydrate. After the hydrazine hydrate in the waste water is dissociated into gaseous hydrazine and then penetrates through a hydrazine removal module into sulfuric acid absorbing solution, the hydrazine hydrate is converted into hydrazinium sulfate. The hydrazinium sulfate is precipitated after cooling, and then is filtered and subjected to secondary neutralization with a sodium hydroxide solution, so as to be reconverted into a high-concentration hydrazine hydrate mixture. The hydrazine hydrate mixture is subjected to evaporation and condensation to obtain a hydrazine hydrate product. The hydrazine hydrate product has high purity and high yield, and has a relatively broad industrialization prospect.

This invention provides a method for producing hydrazine that uses simple equipment, offers high safety, and enables the production of low-moisture hydrazine in high yield without the need for a moisture removal process. [Solution] The method for producing hydrazine according to the present invention comprises: a first step of supplying a first ammonia gas and a chlorine gas; a second step of mixing the first ammonia gas and the chlorine gas to obtain a mixed gas; a third step of reacting the first ammonia gas and the chlorine gas in the mixed gas to produce chloramine gas; a fourth step of supplying the chloramine gas and the second ammonia gas to an alcohol-based solvent and dissolving them to obtain a solution; and a fifth step of heating the solution to react the ammonia and chloramine in the solution to synthesize hydrazine.

This method involves reacting a mixture of hydrazine hydrate and hydroxyethylhydrazine with a nitrate to produce a product mixture containing hydrazine hydrate, hydrazinium nitrate, hydroxyethylhydrazine, and hydroxyethylhydrazinium nitrate, and then distilling the product mixture to produce a final mixture containing hydrazine, hydroxyethylhydrazinium nitrate, and hydrazinium nitrate.

A method includes reacting a mixture of hydrazine hydrate and hydroxyethylhydrazine with a nitrate to produce a product mixture that includes hydrazine hydrate, hydrazinium nitrate, hydroxyethylhydrazine, and hydroxyethylhydrazinium nitrate, and distilling the product mixture to produce a final mixture that includes hydrazine, hydroxyethylhydrazinium nitrate, and hydrazinium nitrate.

This application provides a composite catalyst for the production of hydrazine hydrate using the urea process, comprising the following components by mass percentage: magnesium sulfate heptahydrate; aminotrimethylenephosphonic acid; and sodium hexametaphosphate. A catalytic preparation method for hydrazine hydrate using the urea process includes: preparing a mixed base solution of urea and sodium hydroxide, with a free alkali concentration of 10%–10.5% and a pH of 13.0 ± 0.2; sequentially adding aminotrimethylenephosphonic acid and sodium hexametaphosphate, stirring until homogeneous, then adding magnesium sulfate heptahydrate, and continuing stirring to form a homogeneous complex catalytic system; uniformly adding sodium hypochlorite solution, maintaining a molar ratio of urea to sodium hypochlorite of 1.1–1.2:1, and a reaction temperature ≤ 40°C; maintaining the reaction temperature for 8–12 min after the addition is complete, followed by cooling to obtain crude hydrazine hydrate solution. This application can significantly improve the main reaction rate, suppress the occurrence of side reactions, and effectively prevent Ca from accumulating in the alkali recycling process. 2+ Calcium carbonate precipitate forms, clogging the pipes.

The invention discloses a dimethyl pyridine amine copper complex, a preparation method and application of the dimethyl pyridine amine copper complex in photocatalytic ammoxidation, and belongs to the technical field of organic synthesis. The cuprous complex containing chloride ions is designed and synthesized, and the excellent photocatalytic activity of the cuprous complex is proved. Through a photocatalytic ammoxidation experiment, the final product nitrogen (N2) is successfully detected, and stable generation of a hydrazine (N2H4) intermediate is directly detected in a reaction solution. The discovery provides a powerful experimental evidence for a speculated reaction path of'bimolecular coupling of the copper-amide intermediate to generate hydrazine ', and particularly provides a key ring for understanding and perfecting the whole catalytic cycle under the photocatalytic condition. Excess renewable energy sources are stored in the form of ammonia by utilizing the dimethyl pyridine amine copper complex prepared by the method and are converted into diamine with higher energy density through a photocatalysis process, and an ammonia-light-diamine high-efficiency energy conversion chain can be constructed.

The invention discloses a ruthenium ammonia complex, a preparation method and application of the ruthenium ammonia complex in photocatalytic ammoxidation, and belongs to the technical field of organic synthesis. According to the invention, p-cymene ruthenium dichloride dimer is taken as a precursor and is subjected to mixed reaction with a bipyridine ligand, and the obtained ruthenium ammonia complex or ruthenium diamine complex can be applied to ammoxidation as a photocatalyst. Compared with hydrazine prepared by electrocatalytic ammoxidation of a ruthenium complex, the complex prepared by the invention can be used for photocatalytic ammoxidation to obtain hydrazine, so that the blank that hydrazine is obtained by photocatalytic ammoxidation of the ruthenium complex is filled up, and a cleaner and more efficient method is provided for preparation and purification of hydrazine.

The application belongs to the technical field of analytical measurement, and particularly relates to a standard gas generating device and method for hydrazine propellant of a carrier rocket. The standard gas generating device comprises an inert gas source, the inert gas source is connected with an inert gas outlet pipe, the inert gas outlet pipe is divided into two paths, one path is sequentially connected with a constant temperature module and a mixer through a first pipeline, and the other path is connected with the mixer through a second pipeline; the constant temperature module comprises a constant temperature cavity, and a gasification chamber is arranged in the constant temperature cavity; the gasification chamber comprises a liquid storage tank and a capillary tube arranged on the liquid storage tank, and the liquid storage tank is used for placing liquid hydrazine propellant of the carrier rocket. Through the standard gas generating device and method, the standard gas of the uniform and stable hydrazine propellant can be obtained, and the concentration of the gas can be adjusted and set according to requirements.

The present invention relates to a process for the preparation of hydrazine hydrate, which comprises the step of hydrolyzing an azine in a distillation column in the presence of at least one silicone of the polydialkylsiloxane, polydiarylsiloxane or polyalkyl-arylsiloxane type. The invention also relates to the use of at least one silicone of the polydialkylsiloxane type as an antifoaming agent in the process for the preparation of azine hydrates.