Patent ID: 7122676

Claim:
A process for the preparation of 5,5′-bi-1H-tetrazolediammonium salts, wherein oxalimidic acid dihydrazide is reacted with sodium nitrite in the presence of an acidic substance while maintaining the pH of the reaction solution in a range of from 4 to 6 to form 5,5′-bi-1H-tetrazole through the formation of an azide thereof, and the 5,5′-bi-1H-tetrazole is converted into 5,5′-bi-1H-tetrazoledisodium salt by the addition of sodium hydroxide, the 5,5′-bi-1H-tetrazoledisodium salt is further reacted with ammonium chloride or an aqueous solution thereof, and a formed ammonium salt is recovered as sparingly soluble crystals.