Biomedical Engineering Reference
In-Depth Information
F P0
F A0 +
f A 1
f A 0 =
F P0
PFR
f A 1
f A 2
CSTR
FIGURE 5.12 A CSTR is placed in front of a PFR.
PFR
f
A1
F
P0
f
=
A0
F
A0 +
F
P0
CSTR
f
A2
FIGURE 5.13 A PFR is placed in front of a CSTR.
to those exiting the one reactor placed ahead when no heat exchanger (cause temperature
change) or separation devices (cause composition and/or flow rate to change) were placed
in between the reactors.
If you work with fractional conversion, it is then convenient to define the conversion based
on the total “unreacted reactant” in the feed, that is, converting the products back to the reac-
tants. In this way, the fractional conversion is not set to zero at any reactor inlet and thus
the fractional conversion becomes a continuous variable that can be used for all the reactors
in series.
We use a simple reaction to illustrate the steps of solution
A
/ P;
r ¼ kC A
(5.58)
F P0
F A0 + F P0
f A0 =
FIGURE 5.14 A schematic of a multiple reactors with two PFR's connected in parallel before connected with
another PFR in series.
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