Maximum pressure after decomposition

Maximum pressure after decomposition the maximum pressure obtainable in a closed vessel this pressure is a function of the adiabatic temperature rise and the specific gas production. 

Dartnell, R. C. et al., Loss Prev., 1971, 5, 53-56 MCA Case History No. 1649 A batch of 8 t of material accumulated in storage at 154°C during 72 h decomposed explosively. Stability tests showed that thermal instability developed when 3-methyl-4-nitrophenol is stored molten at temperatures above 140°C. Decomposition set in after 14 h at 185° or 45 h at 165°, with peak temperatures of 593 and 521°C, respectively. In a closed vessel, a peak pressure of 750 bar was attained, with a maximum rate of increase of 40 kbar/s. Thermal degradation involves an initially slow exothermic free radical polymerisation process, followed by a rapid and violently exothermic decomposition at take-off. 

The inhibition of the ethane decomposition by NO has been studied by a number of workers.There seems to be a maximum inhibition of the reaction somewhere in the range 2 to 10 per cent (NO). The effect is least at higher temperatures and also at higher total pressures. In addition the effect seems to be greatest on the initial rate, the inhibited reaction appearing to follow the normal reaction after several per cent decomposition. 

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