Enzymes - Bioprocess Engineering: Kinetics, Biosystems, Sustainability and Reactor Design - page 365

Q, S 0

Q, S

FIGURE 8-4.2 A schematic of a CSTR.

r S
n

r P
n

From stoichiometry, ¼ . Thus

S P

QS

0

QS
V ¼ Dð

r P ¼r S ¼ S

0

S Þ (E8-4.13)

D ¼ Q=V ¼ 15=5000=min ¼ 310 3 min 1
Therefore, the mole balance Eqn (E8-4.13) is a straight line on the (S, r P ) plane with a negative
slope of 10 3 min 1 ) and intercept on the S-axis of S 0 ¼

D ( 3 60 mmol/L. Plot the mole

balance line (red line) on to the Fig. 8-4.1 yields Fig. 8-4.3 .

0.20

0.18

0.16

0.14

0.12

0.10

0.08

0.06

0.04

0.02

0.00

0 10 20 30 40 50 60

S , mmol/L

FIGURE 8-4.3