Abstract:
Disclosed is a preparation method of 2,2'-bi-1H-imidazole using glyoxal and an ammonium salt as starting materials through a safe, simple and easily controlled synthetic process with a high yield.
Abstract:
PURPOSE: Provided is a preparation method of 3-nitro- 1,2,4-triazol-5-one (NTO) which shows stability against impact or heat and has high-explosive energy. The method simplifies a process by eliminating the process for filtration, drying, crushing of NTO and reproviding it, thus increases its yield. CONSTITUTION: A preparation method of NTO is composed of the following steps of; (a) preparing 1,2,4-triazol-5-one (TO) by condensation reaction of semicarbazide·HCl and formic acid and then distillation of formic acid; (b) synthesizing NTO by adding high concentration sulfuric acid, water and nitric acid in high concentration preferably at 60 deg.C without process of filtration, drying and crush of the prepared TO.
Abstract:
The present invention provides a method for preparing 2,4-dinitroimidazole, wherein separation of 1,4-donitroimidazole in powder form is avoided so that it is possible to eliminate allergy problems in workers and simplify the process, thereby improving process economy.
Abstract:
Provided is a nitrification method of 4,6-dihydroxy-2-methylpyrimidine used as a precursor of 1,1-diamino-2,2-dinitro ethylene which is a kind of gunpowder by using an organic solvent to secure a high yield. A nitrification method of 4,6-dihydroxy-2-methylpyrimidine comprises the following steps of: melting the 4,6-dihydroxy-2-methylpyrimidine in concentrated sulfuric acid in a first step; adding dichloromethane to a solution of the first step in a second step; and adding concentrated nitric acid to the solution of the second step and stirring the obtained solution in a third step.
Abstract:
The present invention relates to a composite explosive including 4,4′-(ethane-1,2-diyl) bis (5-nitroiminotetrazol-1-id) organic salts which is a rich nitrogen material with high energy. Particularly, the present invention relates to a compression type or a casting type composite explosive including bis(ammonium)-4,4′-(ethane-1,2-diyl)bis(5-nitroiminotetrazol-1-id) or bis(guanidinium)-4,4′-(ethane-1,2-diyl)bis(5-nitroiminotetrazol-1-id).
Abstract:
PURPOSE: A manufacturing method of 1,2-bis(5-aminotetrazole-1-yl)ethane is provided to reduce the generation of harmful materials and to obtain a mass production process with low carbon, high nitrogen, and environmentally friendly nitroaminotetrazole classes. CONSTITUTION: 1,2-bis(5-aminotetrazole-1-yl)ethane is manufactured from an ethane derivative represented by chemical formula (I) and 5-aminotetrazole hydrate through a nucleophilic substitution reaction which uses water as a solvent under the presence of hydroxide of an alkali metal. The 1,2-bis(5-aminotetrazole-1-yl)ethane is manufactured from a 5-aminotetrazole derivative represented by chemical formula (II) and 5-aminotetrazole hydrate through a nucleophilic substitution reaction which uses water as a solvent under the presence of hydroxide of an alkali metal. The 1,2-bis(5-aminotetrazole-1-yl)ethane is separated by filtering at 80-100 deg. Celsius after the nucleophilic substitution reaction. The hydroxide of alkali metal is selected from NaOH(sodium hydroxide) or potassium hydroxide.