B.E-B.E Biotechnology 1st Sem REACTION ENGINEERING (315466)(University of Pune, Pune-2013)
UNIVERSITY OF PUNE
[4363]-276
T. E. (BIOTECHNOLOGY), Examination 2013
REACTION ENGINEERING (315466)
(2008 Pattern)
[Total No. of Questions:12] [Total No. of Printed pages :3]
Time : 3 Hours] [Max. Marks : 100]
Instructions :
(1) Answers any 3 questions from each section
(2) Answers to the two Sections should be written in separate
answer-books
(3) Neat diagram must be drawn wherever necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
SECTION I
Q1 a) Discuss about classification of chemical reactions.
b) Define molecularity and order of reaction.
c) Differentiate between elementary and non-elementary reactions with suitable examples.
OR
Q.2 a) Milk is pasteurized if it is heated to 600 C for 25 min but if it is heated [9]
to 700 C it only needs 15 sec for same process. Determine the activation energy of sterilization process.
b) Explain kinetic model for nonelementary reaction.
Q.3 a) A homogeneous gas reaction A=3R at 2000 C has the rate -rA =10-2
CA1/2 (mol/ lit.sec). Find the space time needed for 80% conversion of
50% A and 50% inert feed to a plug flow reactor operating at 2000 C
and 4 atm if the Initial concentration is 0.0625 mol/lit.
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b) Define space time and space velocity for flow reactor. [6]
OR
Q.4 a) Derive the equations relating time, initial concentration and conversion [8]
of an ideal batch reactor for constant density system.
b) For first order homogeneous gaseous reacting A= 2.5 R is carried
out in an isothermal batch reach at 2 atm with 20% (mole) inserts
present and the volume increases by 60% in 20 min. In case of constant volume reactor, determine the time required for pressure to reach 8 atm if initial pressure is 5 atm, 2 atm of which consist of inerts.
Q.5 a) Derive the expressions for residence time distribution for pulse input
method.
b) Write short note on segregated flow model.
OR
Q.6 a) Write short note on dispersion model.
b) A sample of tracer hytane at 320 k was injected as a pulse to a reactor
and the effective conversion measured as a function of time, resulting
the following data,
t(min) 0 1 2 3 4 5 6 7 8 9 10 12 14
C(g/m3) 0 1 5 8 10 8 6 4 3 2.2 1.5 06 0
The measurement represents the exact concentration at the times listed and
not average values between the various sampling tests.
a) Construct a figure shows C (t) and E(t) as a function of time.
b) Determine both the fraction of material leaving the reactor that has spent
between 3 and 6 min. in the reactor.
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SECTION II
Q.7 Write a short note on: [18]
i) Progressive Conversion Model ii) Shrinking Core Model
OR
Q.8 a) Derive overall rate equation for given system A(L) + B(S) =R(L).
Dilute A diffuses through a stagnant liquid film onto a plane surface
consisting of B, reacts to produce R which diffuses back into the
mainstream. Develop the overall rate expression for the L/S reaction. b) Explain diffusion through gas film controls in details.
Q.9 a)Discuss about mechanism of solid catalysed reaction.
b)Explain pore diffusion resistance combined with surface kinetics with
example
OR
Q10 a) Determine the amount of catalyst required in packed bed reactor
for 80% conversion of 1000 mol/min if CA0 = 8mol/m3 of feed.
b) Write short note on:
i) Trickle bed reactor ii) Slurry reactor
Q11 a) Explain different types of inhibitors encountered in enzyme kinetics.
b) Discuss about Michaelis-Menten kinetics.
OR
Q12 Write short note on:
i) Factors affecting growth kinetics
ii) Product limiting microbial fermentation
iii) Substrate limiting microbial fermentation
iv) Enzyme deactivation kinetics
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| Earning: ₹ 7.05/- |
