Ammonium dinitramide

Lore & Background

Ammonium dinitramide was invented in 1971 at the Zelinsky Institute of Organic Chemistry in the USSR. Initially all information related to this compound was classified because of its use as a rocket propellant, particularly in Topol-M intercontinental ballistic missiles. In 1989 ammonium dinitramide was independently synthesized at SRI International, which obtained US and international patents for ADN in the mid-1990s, at which time scientists from the former Soviet Union revealed that they had discovered ADN 18 years earlier.

Reader's Guide

Ammonium dinitramide's significance lies in its role as a high-performance, halogen-free oxidizer for solid rocket propellants, offering a slightly higher specific impulse than ammonium perchlorate while avoiding corrosive hydrogen chloride fumes. This property is militarily valuable because halogen-free smoke is harder to detect. However, ADN is more prone to detonation under high temperatures and shock compared with perchlorate. Its development was initially classified in the USSR for use in Topol-M intercontinental ballistic missiles, and it was independently synthesized later in the US. The compound's hygroscopicity remains a challenge, prompting research into co-crystallization and mixtures to improve handling. ADN-based monopropellant FLP-106 shows improved performance and density over comparable formulations. Multiple synthesis routes exist, including nitration of sulfamic acid, the guanylurea dinitramide method, and the urethane synthesis method, with yields up to 60%.

Did You Know?

• Ammonium dinitramide decomposes under heat to leave only nitrogen, oxygen, and water.
• ADN was invented in 1971 at the Zelinsky Institute of Organic Chemistry in the USSR and independently synthesized at SRI International in 1989.
• The monopropellant FLP-106, based on ADN, has a specific impulse of 259 s and density of 1.362 g/cm³.
• ADN is more prone to detonation under high temperatures and shock compared with ammonium perchlorate.