Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2160506 Chemical Reaction Engineering I Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2160506 Date:07/12/2018
Subject Name:Chemical Reaction Engineering - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Classify reactions giving example of each 03
(b) Differentiate elementary and non elementary reactions. 04
(c) List various theories of temperature dependency on rate of reaction and
discuss any one in detail.
07
Q.2 (a) Write a short note on ?Variable volume batch reactor? 03
(b) The rate constant k at 27?C is 1.3?10
-3
sec
-1
and its frequency factor is
2.785*10
-6
sec
-1
. Determine its Entropy of activation and Enthalpy of
activation.
04
(c) Derive integrated rate expression for a liquid phase reaction
2A? Products.
07
OR
(c) At certain temperature, the half-life period and initial concentration for a
reaction are,
t1/2 = 420 sec; C A0 = 0.405 mole/lit
t1/2 = 275 sec; C A0 = 0.640 mole/lit
Calculate the order of reaction and rate constant of the reaction.
07
Q.3 (a) Define space time and space velocity. 03
(b) Derive performance equation for a ideal batch reactor 04
(c) The reaction A?B, r = k C A0
2
, occurs in CSTR with 90% Conversion, if k=
0.5 liter/mole min, C A0 = 2 mole/liter and ? = 4 liter/ min, what residence
time and reactor volume will be required?
07
OR
Q.3 (a) Explain the method for searching the mechanism of chemical reaction.
03
(b)
Compare and contrast Integral method of analysis with differential method
of analysis of kinetic data.
04
(c) In a batch reactor, assuming first order kinetics, the conversion of a liquid
reactant A is 70% in 13 min. Find the space time required to effect this
conversion in a plug flow reactor and a mixed flow reactor.
07
Q.4 (a) Discuss equal sized mixed flow reactors in series 03
(b) Derive performance equation for a CSTR. 04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2160506 Date:07/12/2018
Subject Name:Chemical Reaction Engineering - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Classify reactions giving example of each 03
(b) Differentiate elementary and non elementary reactions. 04
(c) List various theories of temperature dependency on rate of reaction and
discuss any one in detail.
07
Q.2 (a) Write a short note on ?Variable volume batch reactor? 03
(b) The rate constant k at 27?C is 1.3?10
-3
sec
-1
and its frequency factor is
2.785*10
-6
sec
-1
. Determine its Entropy of activation and Enthalpy of
activation.
04
(c) Derive integrated rate expression for a liquid phase reaction
2A? Products.
07
OR
(c) At certain temperature, the half-life period and initial concentration for a
reaction are,
t1/2 = 420 sec; C A0 = 0.405 mole/lit
t1/2 = 275 sec; C A0 = 0.640 mole/lit
Calculate the order of reaction and rate constant of the reaction.
07
Q.3 (a) Define space time and space velocity. 03
(b) Derive performance equation for a ideal batch reactor 04
(c) The reaction A?B, r = k C A0
2
, occurs in CSTR with 90% Conversion, if k=
0.5 liter/mole min, C A0 = 2 mole/liter and ? = 4 liter/ min, what residence
time and reactor volume will be required?
07
OR
Q.3 (a) Explain the method for searching the mechanism of chemical reaction.
03
(b)
Compare and contrast Integral method of analysis with differential method
of analysis of kinetic data.
04
(c) In a batch reactor, assuming first order kinetics, the conversion of a liquid
reactant A is 70% in 13 min. Find the space time required to effect this
conversion in a plug flow reactor and a mixed flow reactor.
07
Q.4 (a) Discuss equal sized mixed flow reactors in series 03
(b) Derive performance equation for a CSTR. 04
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2
(c) The thermal cracking of ethane is carried out in a tubular reactor for large
scale production of ethylene. The reaction is
C2H6? C2H4+ H2
The ethane fed at the rate of 10 tons/hr, is diluted with steam (0.5 mole of
steam: 1 mole of Ethane) before entering the reactor to reduce amount of
undesired products. The reaction is maintained at 900 ?C and 1.4 atm total
pressures. Reaction is first order irreversible and rate constant is 12.8 sec
-1
at 900?C. Calculate the volume of reactor required for 60% conversion of
ethane per pass.
07
OR
Q.4 (a)
Show how fractional conversion X, is related to temperature for any
exothermic reaction being carried out in an adiabatic batch reactor.
03
(b) Write a short note on Recycle reactor. 04
(c)
Derive the equation in terms of concentration for irreversible reactions in
series for uni-molecular type first-order reaction such as
S
k
R
k
A ? ?
2 1
07
Q.5 (a) Discuss the effect of pressure on equilibrium conversion as predicted by
thermodynamics keeping temperature fixed
03
(b) Discuss the method of maximization of rectangles applied to find the
optimum intermediate conversion and optimum sizes of two mixed reactors
in series
04
(c) For the parallel decomposition of A where R is desired and C A0= 1
What is the maximum CR, we may expect in an isothermal operation in
Batch Reactor , where the value of rR = 1, rS = 2CA, rT = CA
2
07
OR
Q.5 (a) Discuss the effect of inert on equilibrium conversion as predicted by
thermodynamics keeping temperature fixed
03
(b) Explain optimum temperature progression in brief. 04
(c) Describe quantitative discussion about product distribution for reactions in
parallel.
07
*************
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This post was last modified on 20 February 2020