Which one of the following combinations gives the highest conversion for second order reaction?(a) PFR followed by smaller CSTR followed by a bigger CSTR(b) PFR followed by bigger CSTR followed by a bigger CSTR(c) Smaller CSTR followed by PFR followed by a bigger CSTR(d) Bigger CSTR followed by a PFR followed by smaller CSTRThis question was addressed to me by my college professor while I was bunking the class.Question is taken from Kinetics of Homogeneous Reactions in chapter Kinetics of Homogeneous Reactions of Chemical Reaction Engineering

Which one of the following combinations gives the highest conversion f

1.	Which one of the following combinations gives the highest conversion for second order reaction?(a) PFR followed by smaller CSTR followed by a bigger CSTR(b) PFR followed by bigger CSTR followed by a bigger CSTR(c) Smaller CSTR followed by PFR followed by a bigger CSTR(d) Bigger CSTR followed by a PFR followed by smaller CSTRThis question was addressed to me by my college professor while I was bunking the class.Question is taken from Kinetics of Homogeneous Reactions in chapter Kinetics of Homogeneous Reactions of Chemical Reaction Engineering
Answer» Correct answer is (a) PFR followed by smaller CSTR followed by a bigger CSTR To explain I would say: For reactions of order greater than ONE, HIGHER conversion is achieved in a PFR. Smaller the volume of a CSTR, it tends to BEHAVE as a PFR. Hence, for higher CONVERSIONS, the reactors are arranged in the order PFR followed by smaller CSTR followed by a bigger CSTR.

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