Tetryl activation energy

According to Farmer [32] the activation energy of the thermal decomposition of tetryl =60.0 keal and log 5=27.5. Hinshelwood [38] reports similar values. A. J. B. Robertson [41] found, however, that at higher temperatures (211-260°Q =38.0 kcal and log 5=15.4. According to Szyc-Lewanska [42] at still higher temperatures (260-300°C) the activation energy is even lower, viz. E= approximately 20.0 kcal (based on the data given above [40]). 

Merzhanov et al (Ref 3) also made an investigation of the thermal explosion of Dinitrohy-droxydiethylnitramine (mp 52.5°) and of Tetryl (mp 130°) in the liq phase under conditions where the reaction zone was free of temp distribution and the entire thermal gradient was at the walls of the container. The method exptl setup were the same as previously used by the authors (Ref 1). The activation energy, thermal effect critical temp were reported for both expls (Ref 6)... 

Differential scanning calorimetric methods are applied for the determination of heat of fusion, purity, specific heat and activation energy of decompn for undiluted, unmixed samples of TNT, TNB, Tetryl, RDX, HMX and PETN (Ref 28). The differential thermal analysis thermo-... 

If released to water, tetryl may be degraded by hydrolysis. Based on experimentally-derived pH (range of 4-9) versus rate profiles for tetryl at 40, 72, and 85 °C and a range of activation energies, the hydrolysis half-life of tetryl at 20 °C and pH 6.8 was crudely estimated to be 302 76 days. 

Hara, Kamei and Osada 86] obtained similar results.. Among the gases from the decomposition of tetryl they also found methane. They carried out the experiments at temperatures from 150 to 175 0. By differential thermal analysis they found the endothermic (negative) peak at I31 C due to the melting of the substance and exothermic decomposition occurred at 160 C. They calculated the activation energy as being 35 kcal/mol. This is in agreement with formerly obtained results (Vol. HI, p. 53). 

This expression is valid for 10 p 250 atm. The burning rate of Tetryl (as well as many other expls) is little affected by initial temp. For a temp increase of 100 the burning rate increases by a factor of less than two-fold. The apparent activation energy for this temp effect is about Tkcal/mole... 

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