Combustion of unsymmetrical dimethyl hydrazine: Spontaneous ignition in decomposition and oxidation

✍ Scribed by P. Gray; M. Spencer

• Publisher: Elsevier Science
• Year: 1962
• Tongue: English
• Weight: 651 KB
• Volume: 6
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(62)90111-6

✦ Synopsis

The combustion o [ l,, abbreviated here to UDMH) has been investigated in the gaseous phase. It is an endothermic compound and will undergo spontaneous ignition in both decomposition and oxidation. The critical conditions o] pressure and temperature and composition (critical limits) necessary ]or explosion have been measured and the effects on them o[ vessel sur]ace, vessel diameter and inert diluents investigated. The spontaneous ignition limit ]ound [or decomposition of pure Me,oNNH2 is simple and satisfies criteria o] thermal explosion.

The overall activation energy E----28+1 hcal mole -1 derived ]tom the measured (P versus T) limit by application o] thermal explosmn theory agrees with that derived ]tom hinetic investigations of the slow decomposition. By contrast, spontaneous ignition in oxidative combustion is extremely complex and differs qualitatively as well as quantitatively ]rom the superficially analogous combustion mono-, di-and tri-methylamines.

There are [our distinct oxidation rdgimes: slow reaetzon, chemiluminescent oxidation, weah ignition and strong explosion; in addition, multiple ignitions have been observed. The chemical characteristics o] the different modes, the conditions ]or their occurrence, and the part played by sel] heating are investigated.