59results about "Hydrazoic-acids/azides/halogen-azides" patented technology

Disclosed are compositions and methods for inactivating one or more enzymes in a biological sample.

The invention relates to a preparation method of a high-density metal azide with arbitrarily regulated filling density, and belongs to the field of initiating explosive devices. The preparation methodmixes hollow microspheres with different diameters constructed by nanoporous metal/metal oxide and fills a restraint shell with the hollow microspheres to prepare hollow microspheres constructed by the nanoporous metal/metal oxide with a little filling density in the restraint shell, and then places the restraint shell filled with the hollow microspheres constructed by the nanoporous metal/metaloxide in a reactor to be subjected to gas-solid in-situ chemical reaction with hydrazoic acid gas to prepare the metal azide with high filling density. The preparation method of the invention can prepare the high-density metal azide having a filling density of 50%-92% of theoretical density in the restraint shell. The prepared high-density metal azide (for example, the copper azide dose is more than or equal to 0.4 mg) in a single restraint shell can detonate HNS-IV, CL-20, PETN, RDX and other explosives with a filling density being 75%-92% of the theoretical density and a diameter being morethan or equal to 0.5 mm or ignite B/KNO3 and other ignition powder.

The invention discloses a high-performance copper azide composite initiating explosive and a preparation method thereof, and belongs to the crossing field of nano-chemistry and energetic materials. Firstly, a novel copper-sulfur cluster-based porous coordination polymer (Cu12bpy for short) is prepared, and the chemical formula of the compound is [Cu12(StBu)9(CF3COO)3(bpy)4]n. Then, Cu12bpy is usedas a precursor to prepare a copper azide-heteroatom co-doped porous carbon material (CA-HPCH for short); and the CA-HPCH has a high copper azide content (89.43%), excellent ignition capacity (H50>=60cm) and low electrostatic sensitivity (E50=1.1 mJ), and is superior to common copper azide in performance. The micro initiating device made of CA-HPCH has short ignition time (7.0[mu]s) and low ignition energy (0.106 mJ), the performance of the composite initiating explosive exceeds that of most reported initiating explosives, and a basis is provided for further designing and synthesizing a high-performance initiating explosive.

The invention discloses a method for preparing nickel hydrazine azide. The method comprises: taking soluble nickel salts as base solution; using acetic acid to adjust the pH of the formed base solution; using graphite as modified additives of medicaments; adding sodium nitride solution and hydrazine hydrate solution to the base solution dropwise to perform chemical combination; preserving heat, cooling, leaching, washing, dehydrating and drying; and obtaining a finished product of nickel hydrazine azide. The method is simple in pH control, and buffer solution consisting of weak acid and weak-acid salts ensures stable pH, longer effectiveness and the unicity of medicament composition, and significantly improves explosion initiation capacity, so the buffer solution is more suitable to be used as a primary explosive. By adopting nickel acetate as raw material, a small quantity of nickel hydrazine nitrate substances which are formed by use of nitrates and result in worse or unstable pharmaceutical performance can be avoided. Dropping and time difference ensure the complete reaction of sodium nitride and high yield of nickel hydrazine azide.

The invention provides a foam graphene-based metal azide compound and a preparation method thereof. Soluble metal salt, nano metal powder or nano metal oxide is used as a raw material, graphene is used as a conductive carbon material carrier, and the foam graphene-based metal azide compound is prepared. The azide is a metal azide initiating explosive material based on foamed graphene, which is prepared by uniformly dispersing nano metal/metal oxide in a graphene oxide solution and carrying out high-temperature hydrothermal reduction reaction, freeze drying and in-situ azide reaction. Comparedwith the traditional azide, the foam graphene-based azide initiating explosive has the advantages that the particle size can reach hundreds of nanometers, the electrostatic sensitivity of the foam graphene-based azide initiating explosive can be greatly reduced due to the existence of the graphene conductive material, and the safety of the foam graphene-based azide initiating explosive is greatlyimproved.

The invention relates to a preparation method for high-density copper azide with a constrained shell, and belongs to the field of initiating explosive devices. Nanoporous copper or nanoporous copper oxide fills the constraining shell and then is stored, and then the high-density copper azide is prepared by a gas-solid in-situ chemical reaction with hydrazoic acid gas before use; and risks of production, transportation and post-explosive pressing of the traditional primary explosives are avoided during the operation. The prepared copper azide with the constrained shell has high loading density,no dangers during the loading process, safe transportation and storage, and strong detonation power. The explosive quantity of single-shot copper azide in the constrained shell belongs to the submilligram class, and the preparation process is green and pollution-free. The high-density copper azide of which the loading density is 1.4 to 3.2g/cm<3> can be prepared by the method disclosed by the invention, and the prepared high-density copper azide in the constraining shell can initiate explosives such as HNS-IV, CL-20, PETN and RDX of which the loading density is 75% to 92% of the theoretical density and the diameters are not smaller than 0.5mm and ignite igniters of B/KNO3 and the like when the explosive quantity of the high-density copper azide is not smaller than 0.4mg.

The invention relates to the technical field of confinement nanometer compound materials, particularly to a NaN3@BNNTs confinement nanometer compound material and a preparation method thereof. According to the NaN3@BNNTs confinement nanometer compound material, sodium azide is confined inside boron nitride nanotubes, and through weak interaction between the sodium azide and the boron nitride nanotubes, the sodium azide can exist stably, so that the problem of safe storage of the sodium azide can be solved.

The invention discloses a silver azide initiating explosive film and a preparation method thereof. According to the method, het silver azide initiating explosive film is integrated on the surface of a conductive substrate in situ by adopting a two-step electrochemical method. The preparation method specifically comprises the following steps: firstly, preparing a porous silver film by adopting an electrochemical cathode deposition method, and then taking the porous silver film as a precursor, and obtaining the porous silver azide primary explosive film by adopting an electrochemical anode azidation method. Compared with a traditional silver azide preparation method, the method has the advantages that use of high-risk chemical reagents is avoided, and the preparation process is simple, efficient, safe and controllable; and the in-situ growth mode does not need an additional charging process, is highly compatible with the MEMS process, and has a good application prospect in the field of micro-explosion systems.

The invention discloses a synthesis method of sodium azide. According to the synthesis method, sodium nitrite and isoamyl alcohol are taken as the initial raw materials; sodium nitrite and isoamyl carry out reactions, the reaction product is isoamyl nitrite, isoamyl nitrite is dropwise added into alkaline hydrazine hydrate to carry out reactions, and the reaction product is sodium azide crystal. In the provided synthesis method, liquid-liquid homogenous reactions are carried out, the process is easy to control, the operation is stable and safe, the yield is improved by 5% or more, the comprehensive cost is low, and the synthesis method can be applied to industrial massive production.

The invention discloses a method for preparing low-sensitivity copper azide by compounding carbon nano-tubes and copper nano-wires. The method comprises the following steps: preparing copper nano-wires by utilizing a liquid phase reduction method, mixing the copper nano-wires and single-walled carbon nano-tubes, depositing the prepared composite material on an electric-conducting substrate by utilizing an electrochemical deposition method, and preparing the copper azide/carbon nano-tube composite energetic material through a gas-solid phase azide reaction. According to the preparation method provided by the invention, the influence of external force on the reaction product can be effectively reduced so as to improve the safety and the reliability; sodium azide and stearic acid are used asthe reactants, the adopted device is simple, and the azidation efficiency is high; and the accumulation of electrostatic charges on the composite material is reduced through the carbon material, so that the electrostatic sensitivity of the copper azide is reduced while the excellent detonation performance of the copper azide is not affected.

The present invention discloses a process for the on-demand production of small quantities of lead azide. First, a metered quantity of sodium azide solution and a metered quantity of a solution of a lead salt sufficient to react with the sodium azide are introduced into a T-mixer or Y-mixer. Then, the sodium azide and lead salt solutions are conveyed into a static mixer and the azide and lead compounds are permitted to react together, forming insoluble crystals of lead azide as a slurry in an aqueous medium. The lead azide crystals are then separated from the aqueous medium. The process is carried out within an explosion-proof chamber.

The invention belongs to the technical field of environment-friendly waste gas treatment, and particularly discloses a nitromethane waste gas recycling treatment method. According to a technical scheme in the invention, the method comprises the following steps: (1) washing the nitromethane waste gas through multi-stage alkali liquor in sequence; and (2) introducing tail gas washed by the multi-stage alkali liquor into absorption liquid of a sodium hydroxide or potassium hydroxide organic solvent containing hydrazine hydrate for reaction absorption. The invention also provides a method for preparing sodium azide or potassium azide and a medical intermediate methylmercaptotetrazole by using the nitromethane tail gas. The method is different from an existing method which only uses alkali liquor for absorption treatment; and according to the method, the waste gas is purified through multi-stage alkali liquor washing, then methyl nitrite causing excessive emission of nitric oxide is subjected to reaction absorption, efficient co-production can be achieved while the waste gas is treated, the waste is turned into the wealth, and problems in treatment of nitrogen oxides in continuous large-scale production of nitromethane are solved.

The invention discloses a continuous production method of sodium azide. According to the method, a packed tower is used as a reactor such as a fixed bed, so that gas and liquid completely come into contact with each other to finish synthetic reaction within a certain time to realize continuous production, and the synthesis yield is further improved; process conditions are simple, few chemical equipment is used, a flow is short, and the method is applied to industrial production; therefore, the method has huge market space.