Question

State true or false.

For exothermic reactions with large temperature drop, PFR is used.

(a) For exothermic reactions with large temperature drop, PFR is used.

(b) True

(c) False

I got this question in a national level competition.

This interesting question is from RTD for Chemical Reactors in portion Distribution of Residence Time for Chemical Reactors of Chemical Reaction Engineering

Answer 1

The correct answer is (b) True

To explain I would say: The rate rises from low value to a maximum at some value of conversion. After rising, the curve of conversion versus temperature falls. This is a characteristic of autocatalytic reactions. Hence, CSTR is used for exothermic reactions with large temperature drop.