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1. This question concerns the following elementary liquid-phase
reaction:
2A → B
(a) The reaction is to be carried out in a reactor network of two
identical
isothermal CSTRs positioned in series. The feed is pure A and the
conversion
at the outlet of the second reactor must be 0.95.
(i) Determine the conversion at the outlet of the first
reactor.
[9 marks]
(ii) Determine the space time required for each of the
reactors.
[2 marks]
(b) The reactor network is set up as described above and monitored
for potential
issues. Consider the following two scenarios and for each case,
suggest
reasons for the observed behaviour (with justification) and propose
possible
solutions.
(i) Steady state is achieved but the conversions in the two vessels
remain
below the values detailed in part (a). Measurements show that
the
reactor temperature varies throughout the two vessels.
[5 marks]
(ii) Steady state is achieved, and the required conversions are
achieved in
each of the two vessels. However, the conversions decrease with
time.
Measurements show that the reactor temperature is equal and
constant
throughout the two vessels.
[4 marks]
Data:
FA0 = 4 mol min−1
CA0 = 0.5 mol dm−3
k = 4.5 [mol dm−3]−1
min