Discussion
A cooled tubular reactor for an exothermic reaction may develop a hot spot because
Answer: C
Correct answer: generation peaks where concentration is high
Reactant concentration is highest at the inlet, so that is where heat is generated fastest, while the cooling capacity per unit length is the same all along. The temperature therefore peaks somewhere near the front, and because the rate rises with temperature the peak can reinforce itself. Diluting the feed, staging the injection or grading the catalyst activity along the tube all flatten the profile.
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