Reaction engineering

1. POLYMER REACTION
ENGINEERING
Dr. Santoshi Mohanta

2. If we compare size among the MFR and the PFR, mixed flow reactor and the plug flow reactor.
So for a first order and second order reactions we will see the comparison between these two.
So for a given duty the ratio of the sizes MFR and PFR will depend on the following factor is the extent of
reaction, then the stoichiometry and the form of rate equation.
Now if we consider the general rate expression say for a single reaction. For nth order reactions we can
write
−𝑟𝐴=
−1 𝑑𝑁𝐴
𝑉.𝑑𝑡
= 𝐾𝐶𝑛
That is for nth order reaction as we have discussed earlier in last few lectures and here n varies from 0 to 3
Size Comparison of MFR and PFR

4. Now, if we consider the constant density system that means εA would be 0 and the expression can be integrated and
we would obtain