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Ignition of a CSTR refers to

  • A.the coolant in the jacket boiling
  • B.a jump from a low to a high conversion state
  • C.the start of a combustion in the vessel
  • D.the reaction finally reaching its equilibrium

Answer: B

Correct answer: a jump from a low to a high conversion state

As the feed temperature is raised the heat generation curve, which is sigmoidal in temperature, eventually loses its lower intersection with the straight heat removal line. The reactor then jumps to the only remaining steady state, at high temperature and high conversion, and the transition is abrupt rather than gradual. It is called ignition by analogy with combustion and has nothing to do with flame.

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