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Name
Reg No

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
07 THRISSUR CLUSTER
SECOND SEMESTER M.TECH. DEGREE EXAMINATION APRIL 2018
CHEMICAL ENGINEERING
PROCESS CONTROL
07CH6102 ADVANCED CHEMICAL REACTION ENGINEERING
Time:3 hours Max.Marks: 60
Answer all six questions. Part of each question is compulsory.
Answer either part or part of each question
Q.no. Module 1 Marks
1a The first order reversible liquid reaction
A CA0=0.5 mol/liter, CR0=0.
takes place in a batch reactor. After 8 min, conversion of A is 33.3% while the
equilibrium conversion is 66.7%. Find the rate equation for this reaction.
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Answer b or c
b Derive the performance equation for a steady-state plug flow reactor.
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c Gaseous reactant A decomposes as follows:
min-1)CA
Find the conversion of A in a 50% inert feed (ν0=180liter/min,
CA0=300 m mol/liter) to a 1 m3 mixed flow reactor.
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Q.no. Module 2 Marks
2a Illustrate about multiple steady states of exothermic irreversible reactions.
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Answer b or c
b Between 00C 1000C, determine the equilibrium conversion for the elementary
aq. Reaction,
(ΔG
0
298 -14130 J/mol, ΔH0
298= -75300 CPA CPR constant.)
1. Present the results in the form of a plot of temperature conversion.
2. What restrictions should be placed on the reactor operating isothermally if
we want to obtain a conversion of 75% or higher.
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c Explain different non-idealities in a reactor. 5
Q.no. Module 3 Marks
3a Explain effectiveness factor and its significance in solid catalysed reactions.
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Answer b or c
b Determine the amount of catalyst needed in a packed bed reactor with a very
large recycle rate for 35% conversion of A to R for a feed rate of 2000mol/hr of
pure A at 3.2 atm and 1170C. For the reaction at this temperature
mol/kg cat.hr
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c Derive performance equation for reactions containing porous catalyst for plug flow
reactor.
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Q.no. Module 4 Marks
4a Describe the mechanism of catalyst deactivation.
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Answer b or c
b
Two catalytic packed bed reactor is to be designed to treat 100mol/s of reactant A
and produce product R. Feed gas enters ar 2.49MPa 300K, the maximum
allowable temperature is 900K unless otherwise noted, the product stream is
wanted at 300Kand thermodynamic and kinetics of the exothermic reaction are
given to us 40J/mol. for all materials and at all temperatures, ΔHr= -80000
J/mol, same value at all temperatures). Prepare a sketch showing the details of the
system you plan to use.
Type of reactor-plug,recycled or mixed
Amount of catalyst needed.
Heat duty ahead of the reactor, at the reactor itself and after the reactor.
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The temperature of all fluid streams.
Work out a good design for 85% conversion of feed consisting of pure A.
XA 0.85 0.785 0.715 0.66 0.58 0.46
-rA 0.05 0.1 0.2 0.28 0.5 1
c Illustrate different models suggested for explaining the behaviour inside bubbling
fluidised bed.
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Q.no. Module 5 Marks
5a Explain various ways of running G/L reactions catalysed by solids.
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Answer b or c
b Derive the performance equation for different flow patterns of contacting phases
for gas-liquid reaction taking place on the surface of solid catalyst in which the
liquid component is in excess.
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c Aqueous acetone (CB0=1000mol/m3l, and hydrogen atm, νg=0.04
m3g/s,HA=36845 Pa. m3 l/mol) are fed to the bottom of a long, slender column
m high,0.1 m2 cross section) packed with porous Raney nickel catalyst
m cat, ρs=4500 kg/m3cat,fs=0.6,De=8*10-10 m3l/m cat.s) and kept at 140C. At these
conditions acetone is hydrogenated to propanol according to the reaction
H2(gl)+CH3COCH3(l)CH3CHOHCH3
With rate given by

1/2CB
0 and m3l/kg.s(mol/m3l)1/2
What will be the conversion of acetone in this unit? The mass transfer rate
constants are estimated to be
(KAiai)g+l=0.02m3l/m3r.s, KACaC=0.05 m3l/m3r.s
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Q.no. Module 6 Marks
6a What are the basic assumptions made and objectives for gas liquid reactions over
other fluid-fluid reactions..
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Answer b or c
b Derive the rate expression for mass transfer along with reaction (instantaneous
reaction with low CB) of in liquid B. The reaction is given below.

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c Illustrate the design procedure and derive the expression for volume required for
plug flow plug flow L for the reaction for mass transfer
with not very slow reaction.
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