On July 7th, 1973, an explosion and a fire occurred at an acetylene hydrogenation section of T factory ethylene plant of I petrochemical company. Because of a restart error after an emergency shutdown, there was an error in hydrogen feed control. As excessive hydrogen was injected and it hydrogenated ethylene, the reactor reached a high temperature. In addition, there was an exothermic ethylene decomposition reaction. A large fireball (60 m in diameter, duration time 5 seconds) was produced by an explosion of 1200 kg of ethylene.
Read about the incident in this link
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