Irreversible second-order reaction at constant volume

2 Irreversible second-order reaction at constant volume 

For an irreversible second-order reaction, the main parameter is the ratio between the initial concentrations  

The ratio between the CSTR and PFR volumes will be VcSTR (1 - Xa)(M - Xa) 

The influence of the reaction order on the CSTR and PFR volumes is considerable for first- and second-order reactions, M = 1 and conversion Xa = 0.80. Taking into account a second-order kinetics, the CSTR volume is about five times larger than for a first order. On the other hand, this ratio is lower in the PFR, since the PFR volume is only about 2.5 times larger for a second-order kinetics, compared to a first-order and admitting kinetic constants of same order of magnitude. 

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