Abstract
When semi-batch reactors are used for autocatalytic reaction schemes of the type A +
n
B →
k
1
(
n
+ 1) B, B →
k
2
C, the dynamic behaviour of the reactors can be important. Concise discussion of reactor stability is aided by the formulation of dimensionless rate equations. Particular attention is given to conditions which favour the production of B when
n
═ 2. This production is very sensitive to small changes in operational procedure when the concentration of B in the reactor feed stream,
C
B
0
, is small. Various types of bifurcation are observed. In some cases a rapid production of B is preceded by a relatively dormant period in the reactor. During this period, the concentration of B,
C
B
, can be predicted by assuming a pseudo-stationary state. When the non-catalytic reaction A →
k
3
B occurs also, conditions for an eventual increase in
C
B
are changed. Now, when
C
B
0
is low and
k
3
is relatively small,
C
B
can show a damped oscillation with time. Oscillatory behaviour disappears as
k
3
or
C
B
0
increases. As time increases, the concentrations of A and B in the reactor can be predicted from an approximate expression. Comparison with batch reactors shows that a semi-batch reactor can produce higher relative yields of B after the maximum value of
C
B
has been obtained.
Reference13 articles.
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3. Autocatalytic reactions in semi-batch reactors with no catalyst in the feed stream
4. Dainton F. S. 1966 Chain reactions: an introduction 2nd edn. London: Methuen.
5. Proc;Gray P.;R. Soc. Lond.,1988
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