Autodecomposition temperature

However, one must remember that the accumulation of phenylhydroxy-lamines presents a serious danger because these compounds disproportionate with the liberation of much heat and may cause a runaway reaction, that is, an explosion (Fig. 2.33). This becomes especially dangerous if the reaction temperature gets close to 250°C, the autodecomposition temperature of phenylhy-droxylamine. Some of these accidents have been reported.277... 

Bmnsvold, W. Conley, D. Crockatt, and N. Iwamoto, Polyhydroxystyrene carbonate esters for high sensitivity photoresists having autodecomposition temperatures > 160°C, Proc. SPIE 1086, 357 (1989). 

The sustained decomposition of a substance without introduction of any other apparent ignition source besides thermal energy and without air or other oxidants present. Autodecomposition is the result of a thermal self-decomposition reaction for given initial conditions (temperature, pressure, volume) at which the rate of heat evolution exceeds the rate of heat loss from the reacting system, thus resulting in an increasing reaction temperature and reaction rate. 

The solution of pure compound may be stored frozen at 77°K, or in the fluid state at -35°C, without any appreciable reoxidation. The spontaneous decay of purified Fes2+—02 at higher temperatures is identical to the autodecomposition of the nonchromatographed compound (see Fig. 34). 

Finally, graphite is stirred into a mixture of Na[N03] cone H2SO4 which is cooled in an ice bath. Thereupon, K[Mn04] is added to the suspension . Caution During addition of K[Mn04] the temperature should not exceed 20°C to avoid explosive autodecomposition of MojOt. The reaction mixture is kept at 35°C for 30 min, then... 

At the temperature of liquid nitrogen, a completely colorless, crystalline substance. M.p. —70°C. The autodecomposition... 

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