Page 141 - Elements of Chemical Reaction Engineering 3rd Edition

Chap. 3 Summary 113

(S 3- 12)

Equations (S3-11) and (S3-12) also hold for gas-phase reactions car-
ried out at constant volume in batch systems.
8. When using measures other than conversion for reactor design, the
mole balances are written for each species in the reacting mixture:

The mole balances are then coupled through their relative rates of
reaction. If
-rA = k CiCi

then

Concentration can also be expressed in terms of the number of rnoles
(batch) in molar flow rates (flow).

(S3-13)

FA
Liquid: CA = - (S3-14)
VO
9. For reactions in which condensation occurs, e.g.,

A(g) + B(g) - C(g4
before condensation, with P = Po, T = To, 0, = 1,

‘A0
cc = ____
1 -0.sx
and after condensation (X > X,),

where yC,e = Pu,/Po and is the mole fraction of C at which condensa-
tion begins.