Process for forming a dinitramide salt or acid by reaction of a salt or free acid of an N(alkoxycarbonyl)N-nitroamide with a nitronium-containing compound followed by reaction of the intermediate product respectively with a base or alcohol
US5415852A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1992 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Oct 30, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C271/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method is disclosed for forming an ionically bonded dinitramide salt or acid useful as a stable oxidizer for solid fuel rocket propellant or explosive formulations is disclosed. The dinitramide salt is formed by the reaction of an N(alkoxycarbonyl)N-nitroamide and a nitronium-containing compound, at a temperature of from about +60.degree. C. to about -120.degree. C., followed by contacting the reaction mass with a base to form the dinitramide salt, or an alcohol to form the corresponding dinitramidic acid. The N(alkoxycarbonyl)N-nitroamide may be formed by first mixing the corresponding alkylcarbamate with an anhydride of one or more 1-20 carbon organic acids, then adding nitric acid to the reaction mixture. If the salt of the N(alkoxycarbonyl)N-nitroamide is to be formed, a base is then added until the pH reaches about 7-10. The nitronium-containing reactant may be a covalently bonded compound containing a NO.sub.2 -- group; a nitryl halide; or a nitronium salt having the formula (NO.sub.2.sup.+).sub.q X.sup.-q, where X is the anion of the nitronium salt and q=1-2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.