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Posted By: Sra1 Member Level: Diamond Posted Date: 27 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Chemical engineering CHEMICAL REACTION ENGINEERING-I (Supplimentary Examinations, Aug/Sep 2007) Question paper
Set No 2
----------------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) For the reaction 2A+1
2 B ! C write the relation between the rate of formation
and disappearance of the three components of the reaction. [6]
(b) A reaction has the stoichiometric equation 2A ! R+ S what is the order of the reaction. [2]
(c) The reaction with the following stoichiometric equation A+ 12 B !R has the
rate expression ?rA =kCACB
0.5. What is the rate expression for the reaction
written as 2A + B ! 2R [2]
(d) A certain reaction has a rate given by ?rA =0.005CA
2, mol/cm3.min. If the
concentration is to be expressed in mol/lit and time in hours, what would be
the value and units of the reaction rate constant? [6]
2. Pure gaseous A decomposes to completion according to the reaction A!R + S in a
then walled capillary tube which acts as a batch reactor. The required temperature
is maintained in the tube by placing it into a bath of boiling water. The following
data are obtained.
Time (min.) 0.5 1 1.5 2 3 4 6 10
Length of Capillary
occupied by 6.1 6.8 7.2 7.5 7.85 8.1 8.4 8.7 9.4
reactions mixture(mm),
Find a rate equation in units of moles, liters and minutes for the decomposition.
Pressure in the capillary measures 1000mm Hg guage. [16]
3. Experiment shows that the homogeneous decomposition of ozone proceed with a
rate -r03 = K[O3]2[O2]-1. Suggest a two step mechanism to explain this rate and
explain how would you further test this mechanism? [16]
4. (a) Assuming a stoichiometry A ! R, for a first order gas reaction, the size of
plug flow reactor to get 99% conversion is 32 liters. If the stoichiometry is A
! 3 R. What is the required reactor volume?
(b) The first order reaction A ! B is carried out in a tubular reactor in which
volumetric flow rate is constant. Develop an equation relating the reactor
volume to the entering and existing concentration A, the rate constant k, and
the volumetric flow rate ? . Determine the reactor volume necessary to reduce
the existing concentration to 10% of the entering concentration, when the
volumetric flow rate is 10 liters/min. and specific reaction rate k is 0.23/ min.
[8+8]
5. Substance A reacts according to second order kinetics and conversion is 95% from
a single flow reactor. We buy a second unit identical to the first. For the same
conversion, by how much is the capacity increased if we operate these two units in
parallel or in series?
(a) The reactors are both plug flow.
(b) The reactors are both mixed flow. [8+8]
6. (a) Describe the different types of catalysts with examples.
(b) Explain the three mechanisms by which a reactant adsorbed onto the catalyst
surface is capable of reacting to form the product. [10+6]
7. Derive the energy balance equation for an adiabatically operated CSTR. [16]
8. Write brief notes on
(a) Isothermal and non isothermal reactions
(b) Semi batch reactors. [8+8]
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