Many chemical reactions,such as oxidation, chlorination, nitration and polymerization are strongexothermic reaction. If the reaction is out of control or Tuyu power outage,water supply, resulting in accumulation of heat of reaction, a sharp increase inthe temperature inside the reactor, the pressure increases, more than itsvoltage capacity, will lead to rupture of the container. Material from thespray rupture may cause fire and explosion accidents; reactor burst causematerial vapor pressure balance is broken, the instability of the superheatedliquid will cause 2 explosions, steam explosion); ejected material is thenspread rapidly, the space around the reactor（www.fanyingfuw.com） was shrouded in combustible liquiddroplets or steam, ignition source will encounter occurred 3 explosions (mixedgas explosion).
The main reasons that leadto the runaway reaction are: the reaction heat is not removed in time, thereaction material is not evenly dispersed and operation errors, etc..
In March 16, 2007, DongtaiCity, Jiangsu Province, a chemical company in the use of the originalproduction device for the illegal production of new products in the process ofthe new product B / O / C two cyanide process, distillation tower suddenlyexploded, killing 4 people were killed and 1 people were injured. The scene ofthe accident is shown in Figure 1 to figure 3. Lead to the direct cause of theaccident is, excessive ethoxy methylene propyl dinitrile crude productdistillation, resulting in high boiling jam packed bed, pressure inside the distillationkettle, physical explosion occurred, the filler below the tower tower sectionblown, followed by materials of combustion and explosion of the chemical.