Back to results
US 4,900,819 AGranted
Method in the production of crystalline explosives
AssigneeNobel Kemi AB
InventorsPer Ericsson, Leif Svensson, Nils-Ingvar Olsson, Bertil Bergstrom
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNobel Kemi AB
InventorsPer Ericsson, Leif Svensson, Nils-Ingvar Olsson, Bertil Bergstrom
Estimating the term…
The disclosure relates to a method of initiating a crystal growth prior to filtering off, from the mother liquor in which they were produced, of such crystalline explosives of the type hexogen and octogen produced by the so-called Bachmann process or variations of this process. According to the invention, the mother liquor is, after the end of the chemical reaction proper, subjected to a pressure-heat treatment which initiates the partial dissolution of the crystalline explosives obtained in the process, giving rise, after cooling of the mother liquor, to larger crystals which may more readily be filtered off. According to a further improvement of the invention a relatively pure octogen may be extracted from the mother liquor by way of a thermo-filtering of said liquor at a temperature of 60.degree.-110.degree. C.
A method of extracting octogen and hexogen crystalline explosives from the acetic acid acidic mother liquor in which they were produced by nitration of hexamine with ammonium nitrate, acetic acid anhydride and nitric acid, characterized in that the mother liquor with said crystalline explosives formed in the reaction and deposited therein is, after the end of the reaction but before the filtering-off of said explosives, heated in a closed vessel to a temperature in excess of 90.degree. C. but less than 200.degree. C. at a pressure of maximum of 5 bar and is held at said pressure and temperature for a period of time of at least 15 minutes but not exceeding 2 hours, whereafter the octogen and hexogen crystalline explosives are filtered off from the mother liquor.
Dependencies are inferred from the claim text.