Totalforsvarets Forskningsinstitut

Totalfoersvarets Forskningsinstitut

Jonas Johansson

Henrik Skifs

Stefan Ek

Nikolaj Latypov

Martin Skarstind

The invention concerns a method for making ammonium dinitramide from guanylurea dinitramide in one single process step. Guanylurea dinitramide is reacted with an ammonium sulfate in a reaction solution comprising water and acetone and an ion exchange gives ammonium dinitramide. By using acetone the yield is increased compared to known processes as formed guanylurea sulfate is poorly soluable in a water-acetone solution and precipitates, while guanylurea dinitramide has higher solubility in the solution than in only water. The guanylurea sulfate precipitate formed in the reaction solution that contains acetone is less sticky than if formed in water or in a water-alcohol solution and therefore easier to filter off. The use of acetone also allows lower process temperatures to be used than in previously known methods for producing guanylurea dinitramide. Conclusively, the method gives a higher yield, demands considerable smaller amounts of solvent and allows lower process temperatures to be used than in any formerly known process.

Synthesis of ammonium dinitramide (ADN)

The invention concerns a method for making ADN from GUDN in one single process step. GUDN is reacted with an ammonium source (ammonium-sulfamate, ammonium-sulfate, ammonia) and an ion-change gives ADN from GUDN in one process stage. The advantages are that the process gives pure ADN without potassium contaminants and that a smaller amount of solvent is necessary.

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Arsta, Sweden

Jonas Johansson