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P 1 2 - 1 5 The first - order, irreversible, exothermic liquid - phase reaction A - > B is to be carried out

P12-15 The first-order, irreversible, exothermic liquid-phase
reaction
A -> B
is to be carried out in a jacketed CSTR. Species A and
an inert I are fed to the reactor in equimolar amounts. The
molar feed rate of A is 80 mol/min.
Additional information:
Heat capacity of the inert: 30 cal/mol C \tau =100 min
Heat capacity of A and B: 20 cal/mol C \Delta HRx =7500 cal/mol
UA: 8000 cal/min
C k =6.6\times 103min
1at 350 K
Ambient temperature, Ta
: 300 K E =40000 cal/mol K
(a) What is the reactor temperature for a feed temperature
of 450 K?
(b) Plot and then analyze the reactor temperature as a
function of the feed temperature.
(c) To what inlet temperature must the fluid be preheated
for the reactor to operate at a high conversion? What are
the corresponding temperature and conversion of the fluid
in the CSTR at this inlet temperature?
(d) Suppose that the fluid inlet temperature is now heated
5\deg C above the reactor temperature in part (c) and then
cooled 20\deg C, where it remains. What will be the
conversion?
(e) What is the inlet extinction temperature for this
reaction system? (Ans: T =87\deg C)

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