Peroxides ignition temperature

The explosive decomposition of the solid has been studied in detail [6], The effect of moisture upon ignitibility and explosive behaviour under confinement was studied. A moisture content of 3% allowed slow burning only, and at 5% ignition did not occur [7], Thermal instability was studied using a pressure vessel test, ignition delay time, TGA and DSC, and decomposition products were identified [8], The presence of acyl chlorides renders dibenzoyl peroxide impact-sensitive [9], There is a further report of a violent explosion during purification of the peroxide by Soxhlet extraction with hot chloroform [10], Residual traces of the peroxide in a polythene feed pipe exploded when it was cut with a handsaw [11]. The heat of decomposition has been determined as 1.39 kJ/g. The recently calculated value of 69° C for critical ignition temperature coincides with that previously recorded. 

Though regarded as one of the more stable peroxides, it becomes shock-sensitive on heating, and self-accelerating decomposition sets in at 49° C [1]. One of the recently calculated values of 46 and 42°C for induction periods of 7 and 60 days, respectively, for critical ignition temperatures is closely similar to that (4577 days) previously recorded. Autocatalytic combustion of the polymerisation initiator is exhibited. Although not ordinarily shock sensitive, it responds to a detonator [2],... 

Diethyl ether is extremely flammable. Its volatility and low ignition temperature make it one of the most dangerous fire hazards in the laboratory. Ether vapor forms explosive mixtures with air due to the formation of unstable peroxides. Diethyl ether may react violently with halogens or strong oxidizing agents. 

Alcohols do not form peroxides when undergoing oxidation, oxidize at relatively high temperatures, and comprise non-knocking fuels.45 Aromatic compounds as benzene and toluene have relatively high ignition temperatures and are excellent non-knocking fuels. 

From these results it may be concluded that only oxidizable metals influence the ignition temperature and that metals forming peroxides are usually effective. The metal itself when in a state of incipient oxidation is the effective part of the organo-metallic dopes that suppress detonation in an engine, and this metallic oxide is the seat of the action on the combustion process. The most effective metals, with the exception of iron and nickel, are molten and vaporizable at the ignition temperatures. 

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