6results about "Hydrazine" patented technology

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 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.

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.

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 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.