41results 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 discloses a nitrogen-doped carbon-coated ternary nanoneedle array material, a preparation method thereof and application of the nitrogen-doped carbon-coated ternary nanoneedle array material in electrolysis of hydrazine hydrate, and belongs to the technical field of energy catalysis. The material comprises a substrate, a ternary nanoneedle array growing on the surface of the substrate and a nitrogen-doped carbon material loaded on the surfaces of the ternary nanoneedle array and the substrate, the ternary nanoneedle is composed of any three of iron, cobalt, copper, nickel and manganese. According to the NC-loaded ternary nanoneedle array provided by the invention, enrichment of active sites and enhancement of intrinsic activity are realized through cooperation of NC and the ternary nanoneedle array, and the conductivity of the ternary nanoneedle array can be effectively improved. For a hydrogen evolution reaction and an oxygen evolution reaction, electrons can be quickly transferred between the surface of the catalyst and a reaction intermediate, so that the reaction rate is accelerated. Meanwhile, the coating structure enables water molecules to be adsorbed and activated on the surface of the catalyst more easily by adjusting adsorption energy, so that the HzOR catalytic activity is promoted.

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.

The present application relates to the technical field of synthetic chemistry, more particularly, to a preparation method and device of hydrazine sulfate. The present application is aimed at solving the problems of low preparation efficiency and poor safety of hydrazine sulfate. The first object of the present application is to provide a preparation method of hydrazine sulfate. Hydrazine hydrate and concentrated sulfuric acid are first input into a micro-mixer under the conduction of a fluid conduction medium, then input into a spiral tube reactor connected with the micro-mixer for stabilization and reaction, and then cooled to obtain an intermediate product liquid. The intermediate product liquid is post-treated to obtain hydrazine sulfate. The second object of the present application is to provide a device for preparing hydrazine sulfate, comprising a micro-mixer, a spiral tube reactor and a cooling tube connected in sequence. The input end of the micro-mixer is connected with a first feeding pipe, a second feeding pipe and a third feeding pipe for feeding into the micro-mixer.

The invention provides a method for separating and recovering sodium carbonate and sodium chloride in crude hydrazine and concentrating hydrazine and hydrazine hydrate. The crude hydrazine comprises hydrazine hydrate, water, sodium carbonate and sodium chloride, and the method comprises the following steps: drawing a solubility phase diagram of a Na2CO3-NaCl-H6N2O ternary system, evaporating the crude hydrazine, dynamically adjusting the amount of evaporated water according to the solubility phase diagram, preventing Na2CO3 from being separated out, and reducing volatilization of hydrazine hydrate at the same time; when a liquid phase point moves to a point E, stopping evaporation to obtain a sodium chloride product, and cooling the primary mother liquor to obtain a sodium carbonate product; and mixing the secondary mother liquor with the crude hydrazine, and performing circular treatment. According to the method, the Na2CO3-NaCl-H6N2O ternary phase diagram is finely constructed, and the influence of the temperature and the hydrazine hydrate concentration on the solubility of the sodium salt is comprehensively evaluated, so that the optimal condition for precipitation of Na2CO3 and NaCl can be accurately identified, high-purity separation and recovery of Na2CO3 and NaCl are realized, and the hydrazine hydrate concentration is effectively improved.

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.

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 invention relates to the technical field of hydrazine hydrate recovery, and particularly discloses a recovery system and a recovery method for continuously recovering hydrazine hydrate. The recovery system for continuously recovering hydrazine hydrate comprises a waste liquid pipe, an alkali liquor pipe, a solvent pipe, a neutralizer, a preheater, a scraper film evaporator, a solid-liquid separation device, a rectifying tower and a hydrazine hydrate receiving container. The waste liquid pipe, the alkali liquor pipe and the solvent pipe are respectively connected with the neutralizer. And the neutralizer is connected with the preheater. And the preheater is connected with the scraper film evaporator. And the upper end of the scraper film evaporator is connected with the middle part of the rectifying tower. The lower end of the rectifying tower is connected with a hydrazine hydrate receiving container. According to the system, hydrazine hydrate can be continuously recovered, the production efficiency is high, the concentration of the obtained hydrazine hydrate solution is high, the retention time of hydrazine hydrate in the system is short, and the problem of hydrazine hydrate polymerization is basically avoided.

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 discloses a method and a device for recovering hydrazine hydrate, and processes of feeding distillation, condensation water separation and cyclic collection are carried out by virtue of a system device consisting of a reduced pressure rectification mechanism, a condensation water separation mechanism and a cyclic collection mechanism. The hydrazine hydrate is prevented from being decomposed and exploded at high temperature through low-temperature reduced-pressure rectification, and the process safety is remarkably improved; by introducing the layered toluene into the rectifying tower, the hydrazine hydrate entrainment in the distilled liquid is reduced, the hydrazine hydrate residual quantity in the layered wastewater is further reduced and is reduced by more than 80% compared with a traditional method, and the hydrazine hydrate recovery rate is remarkably improved; the water distribution mechanism automatically separates methylbenzene and wastewater, and the automation degree is high; the layered 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 the method is more economical and environment-friendly.

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 present invention discloses a method for preparing ketazine by imine oxidation with oxygen, which comprises the following steps: under oxygen conditions, an imine compound is contacted with a catalyst for an oxidation reaction; the catalyst comprises a composite catalytic material of metal nanoparticles and molecular sieve, and the composite catalytic material comprises a silica molecular sieve and a metal element M dispersed in the intracrystalline of the silica molecular sieve; the metal M is selected from one or more of manganese, iron, cobalt, nickel, palladium, platinum, copper and gold. This method uses a metal-containing hierarchical pore molecular sieve for the oxidative coupling of imine with oxygen to prepare ketazine, without the need to add additional base and ligand, and high conversion rate and ketazine selectivity can be obtained at a relatively low temperature.

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 invention relates to a process for preparing hydrazine hydrate, comprising the following consecutive steps: a) preparing by means of an absorption column of an aqueous solution containing dissolved ammonia and at least one activator, and introducing into said absorption column an aqueous solution containing at least one activator and fresh ammonia; then b) reacting the aqueous ammonia solution containing at least one activator obtained in the previous step with hydrogen peroxide and a ketone in at least one reactor; then c) separating the organic phase containing azine from the aqueous phase from the stream formed at the end of the previous step; then d) hydrolyzing the organic phase obtained in the previous step to obtain hydrazine hydrate.

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.

The present invention provides a tail gas treatment system and method for producing 80% hydrazine hydrate by rectification and purification, wherein the tail gas treatment system is connected to the rectification system, and the rectification system comprises an evaporation heating device, a frother, a rectification tower, a cooler and a hydrazine storage tank connected in sequence; the tail gas treatment system comprises a steam compressor and a condenser, the first outlet pipeline at the top of the rectification tower is connected to the condenser, the second outlet pipeline at the top of the rectification tower is connected to the inlet of the steam compressor, and the outlet of the steam compressor is directly connected to the heating pipeline of the evaporation heating device. The tail gas treatment system for producing 80% hydrazine hydrate by rectification and purification of the present invention can compress the tail gas of the rectification tower into high-temperature and high-pressure steam, and use it as a heating heat source for the evaporation heating device, gradually replacing the raw steam to heat the evaporation heating device, which can not only save steam, realize the recycling of heat energy, and save energy and reduce consumption; it can also avoid condensing the tail gas into wastewater, thereby reducing wastewater discharge.

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.

PROCESS FOR PREPARING HYDRAZINE HYDRATE USING CASCADE REACTORS The invention relates to a process for the continuous preparation of hydrazine hydrate, comprising a step of reacting ammonia, hydrogen peroxide and a ketone of formula R1R2CO, the groups R1 and R2 independently denoting a methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl and octyl group, in the presence of an aqueous solution comprising at least one activator to form an azine, the reaction being carried out in at least 2 reactors arranged in cascade, the stirring of the first reactor being less than the stirring of the or each of the following reactors, the reactants being injected at the level of the first reactor, the aqueous solution comprising at least one activator and comprising solubilized ammonia in a proportion of between 50% and 100% relative to the saturation of ammonia in pure water at the temperature of the aqueous solution.