Question

Question 2 :

Consider the following gas phase reactions: (flow reactor)

Rxn 1 : A X

　 k1 = 0.004 (mol/dm3)1/2.min-1

Rxn 2 : A B - k2 = 0.3 min-1.

Rxn 3 : A Y

k3 = 0.25 dm3/mol/min

B is the desired product and X and Y are the foul pollutants that are expensive to get rid of. The

specific reaction rates are at 27 oC ( 300K).

The reaction system is to be operated at 27 oC and 4 atm.

Pure A enters the system at a volumetric flow rate of 10 dm3/min.

[a] Sketch the instantaneous selectivity ( SB/X and SB/Y and SB/(X+Y)) as a function of the

concentration in a CSTR.

The activation energy data for each reaction :-

E1 = 20000 cal/mol

E2 = 10000 cal/mol

E3 = 30000 cal/mol

[b] What temperature would you recommend for a single CSTR with a space time of 10

mints and an entering concentration of A, CAO = 0.1 mol/dm3.

Answer 1