CMBR vs. CMFR (CSTR) Similarities

o Contents in the tank completely uniformo Density and temperature are uniform throughouto Any chemical added is instantly and uniformly distributed

Differenceso In CMBR all reactants in reactor for same residence time and in CMFR

reactants in reactor for variety of residence timeso In CMBR concentration of reactants changes with time and in CMFR

concentration of reactants is the same throughout the reactor all the time

For a first order irreversible reaction in solution in which contaminant A is‐ converted: rA = kC‐ A

A batch reactor is to be designed for a first‐order reaction, and the required

removal or conversion of A is 90%. If the rate constant, k, is 0.35 hr‐1, what is the required residence time in hours for the batch reactor?

A CSTR is to be designed for a first‐order reaction, and the required conversion of A is 90%. If the rate constant (k) is 0.35 hr‐1, what is the required residence time in hours?

Compare the reactor volume required to achieve 95% efficiency for a CMFR and a PFR for the following conditions; steady-state, first-order reaction, flow rate = 14 m3/d, and reaction rate coefficient = 0.05 day-1