Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2173612 Fundamentals Of Reaction Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2173612 Date: 03/12/2018
Subject Name: Fundamentals of Reaction Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Differentiate elementary and non-elementary reactions. 03
(b) Write a short note on various reaction intermediates used to elucidate
kinetics of non ? elementary reactions.
04
(c) Compare theories available for predicting the temperature dependency of
reaction rate.
07
Q.2 (a) On doubling concentration of reactant rate of reaction triples. Find the
order of reaction.
03
(b) Derive integrated form of rate expression for n
th
order reaction 04
(c) An aqueous solution of ethyl acetate is to be saponifed with sodium
hydroxide. The initial concentration of ethyl acetate is 5g/l and that of
caustic is 0.1N. The values of second order reaction rate constant at 0 ?C
and 20 ?C are k = 0.235 and 0.924 (l/mol min) respectively. The reaction
is reversible. Calculate the time required to saponify 95% ester at 40 ?C.
07
OR
(c) For the reaction A ? R ? S estimate the maximum concentration of R
and time at which maximum concentration of R occurs.
07
Q.3 (a) Write on (i) Space time (ii) Space velocity (iii) Residence time 03
(b) For a gaseous feed of C A0 = 100 CB0 = 200 enters an isothermal flow
reactor. For XA = 0.8. Find CA,CB and XB
04
(c) Describe differential and integral method of analysis of rate data. 07
OR
Q.3 (a) Explain correlation between fractional conversion and Damkohler
number for a first order gas phase reaction of constant volume.
03
(b) Write a short note on batch reactor systems used in process industries with
advantages and disadvantages.
04
(c) A parallel liquid phase reaction A ? R (k1); A ? S (k2) has rate constants
k1 = 5 hr
-1
and k2 = 0.8 hr
-1
. Find the moles of R produced in 15 min. Take
C A0 = 8.5 mol/l. CR0 = C S0 = 0
07
Q.4 (a)
Explain (i) standard heat of formation (ii) standard heat of combustion (iii)
standard heat of reaction
03
(b)
Establish concentration levels that needs to be maintained for a bi-molecular
reaction inorder to maximize formation of desired product.
04
(c) Prove that for reaction of first order occurring in a system of N CSTR?s
connected in series the behavior of overall system matches that of PFR.
07
OR
Q.4 (a) Differentiate overall fractional yield and selectivity. 03
(b) The standard heat of a gas phase reaction at 25 ?C
A + B ? 2R is ? ?? ?? 0
= ?HR (25?C) = - 50000 J indicating that reaction is
strongly exothermic. It is desired to run this reaction at 1000 ?C. What is
the nature and value of heat of reaction at that temperature?
04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2173612 Date: 03/12/2018
Subject Name: Fundamentals of Reaction Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Differentiate elementary and non-elementary reactions. 03
(b) Write a short note on various reaction intermediates used to elucidate
kinetics of non ? elementary reactions.
04
(c) Compare theories available for predicting the temperature dependency of
reaction rate.
07
Q.2 (a) On doubling concentration of reactant rate of reaction triples. Find the
order of reaction.
03
(b) Derive integrated form of rate expression for n
th
order reaction 04
(c) An aqueous solution of ethyl acetate is to be saponifed with sodium
hydroxide. The initial concentration of ethyl acetate is 5g/l and that of
caustic is 0.1N. The values of second order reaction rate constant at 0 ?C
and 20 ?C are k = 0.235 and 0.924 (l/mol min) respectively. The reaction
is reversible. Calculate the time required to saponify 95% ester at 40 ?C.
07
OR
(c) For the reaction A ? R ? S estimate the maximum concentration of R
and time at which maximum concentration of R occurs.
07
Q.3 (a) Write on (i) Space time (ii) Space velocity (iii) Residence time 03
(b) For a gaseous feed of C A0 = 100 CB0 = 200 enters an isothermal flow
reactor. For XA = 0.8. Find CA,CB and XB
04
(c) Describe differential and integral method of analysis of rate data. 07
OR
Q.3 (a) Explain correlation between fractional conversion and Damkohler
number for a first order gas phase reaction of constant volume.
03
(b) Write a short note on batch reactor systems used in process industries with
advantages and disadvantages.
04
(c) A parallel liquid phase reaction A ? R (k1); A ? S (k2) has rate constants
k1 = 5 hr
-1
and k2 = 0.8 hr
-1
. Find the moles of R produced in 15 min. Take
C A0 = 8.5 mol/l. CR0 = C S0 = 0
07
Q.4 (a)
Explain (i) standard heat of formation (ii) standard heat of combustion (iii)
standard heat of reaction
03
(b)
Establish concentration levels that needs to be maintained for a bi-molecular
reaction inorder to maximize formation of desired product.
04
(c) Prove that for reaction of first order occurring in a system of N CSTR?s
connected in series the behavior of overall system matches that of PFR.
07
OR
Q.4 (a) Differentiate overall fractional yield and selectivity. 03
(b) The standard heat of a gas phase reaction at 25 ?C
A + B ? 2R is ? ?? ?? 0
= ?HR (25?C) = - 50000 J indicating that reaction is
strongly exothermic. It is desired to run this reaction at 1000 ?C. What is
the nature and value of heat of reaction at that temperature?
04
2
Data: The mean/average CP values between 25 ?C and 1000 ?C for various
reaction components are
?? ? pA = 35 J/mol K ?? ? pB = 45 J/mol K ?? ? pR = 70 J/mol K
(c) An aqueous reactant stream (4 mol A/l) passes through a mixed flow
reactor followed by a plug flow reactor. Find the concentration at exit of
plug flow reactor if in mixed flow rector the concentration is 1 mol/l. The
reaction is second order with respect to A and volume of plug flow reactor
is three times volume of mixed flow reactor.
07
Q.5 (a) Write a short note on catalyst deactivation 03
(b) Discuss essential properties required for a catalyst. 04
(c) For decomposition of cumene to benzene synthesize a rate law
considering surface reaction as rate determining step.
07
OR
Q.5 (a) N2O4 decomposes according to relation
N2O4 (g) NO2 (g)
At 27 ?C and 1 atm, 20% of N2O4 is dissociated. Calculate equilibrium
constant KP. (Take basis as 1 mol of N2O4 gas)
03
(b) Differentiate modifiers and inhibitors. 04
(c) Mention the seven steps governing the rate of conversion of reactant to
product in a catalytic reaction.
07
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This post was last modified on 20 February 2020