Ammonium perchlorate

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Ammonium perchlorate
IUPAC name	Ammonium perchlorate
Other names	AP
Identifiers
CAS number	7790-98-9
SMILES	O=Cl(=O)(=O)O-.[NH4+]
Properties
Molecular formula	ClH4NO4
Molar mass	117.48876 g/mol
Appearance	white granular
Density	1.95 g/cm³
Melting point	Exothermic decomposition before melting, 595 - 750 K[1]
Solubility in water	18.5 g/100 g H2O (15 °C)[1]
Structure
Crystal structure	Orthorhombic (< 513 K) Cubic (> 513 K)
Hazards
MSDS	External MSDS
EU classification	Explosive (E), Harmful (Xn)
NFPA 704	0 1 4 OX
R-phrases	R9 R20 R21 R22
S-phrases	S14 S16 S27 S36 S37
Related Compounds
Other anions	ammonium chlorate ammonium chloride
Other cations	potassium perchlorate sodium perchlorate lithium perchlorate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Ammonium perchlorate (AP) is a chemical compound with the formula NH₄ClO₄. It is the salt of ammonia and perchloric acid. Like other perchlorates, it is a powerful oxidizer.

It is produced by reaction between ammonia and perchloric acid, or by double decomposition between an ammonium salt and sodium perchlorate.

It crystallises in colorless rhombohedra with a relative density of 1.95. Like most ammonium salts, it decomposes before melting. Mild heating results in chlorine, nitrogen, oxygen and water, while strong heating may lead to explosions.

The combustion of such compound is quite complex and is widely studied in literature. Ammonium perchlorate crystals decompose before melting, even though a thin liquid layer has been observed on crystal surface during high pressure combustion processes.^[1]

The gaseous decomposition products are in general ammonia- and chlorine-based and can react together generating a thin premixed flame very close to the crystal surface. Pure crystals cannot sustain a flame below the pressure of 20 bar (2 MPa). Nevertheless, the material is considered hazardous if ground under 15 micrometres. When AP is mixed with a fuel (like a metal powder or mixed with a polymeric binder) it can generate self-sustained combustion also far under atmospheric pressure.

It is an important oxidizer used in solid rocket propellants known as Ammonium perchlorate composite propellants (APCP). Uses include the Space Shuttle Solid Rocket Boosters, as well as many other solid rockets including some fireworks, amateur and hobby high powered rockets, and larger rockets used for space launch and military purposes.

The PEPCON disaster happened at an ammonium perchlorate manufacturing plant. The resulting explosions measured 3.5 on the Richter scale some 600 miles (1000 km) away. Over 400 people were injured, but only 2 died in the monstrous blast.

References

de:Ammoniumperchloratnl:Ammoniumperchloraat ja:過塩素酸アンモニウムfi:Ammoniumperkloraatti