Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 7th Sem New 21735092173514 Environmental Reaction Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2017
Subject Code: 2173509/2173514 Date: 10/11/2017
Subject Name: Environmental 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) Make a mole balance on a batch reactor conducting a liquid phase
bimolecular reaction with a reaction rate constant k2 in units of liter,
mol, and min to estimate time required for certain conversion of a
reactant of the reaction.
03
(b) An aqueous feed of A and B (400 liter/min, 100 mmol A/liter, 200
mmol B/liter) is to be converted to product in a plug flow reactor. The
kinetics of the reaction is represented by A + B ? R,
-rA = 200 CACB mol/(liter)(min). Find the volume of reactor needed
for 99.9% conversion of A to product. Draw a schematic diagram.
04
(c) We plan to replace our present mixed flow reactor with one having
double the volume. For the same aqueous feed (10 mol A/liter) and
the same feed rate find the new conversion. The reaction kinetics are
represented by A ? R, -rA = k CA
1.5
, and present conversion is 70%.
Draw a schematic diagram.
07
Q.2 (a) Given the elementary reaction taking place in a batch reactor
and k1 > k2, derive for CA and CR as functions of time, and sketch the
concentration-time profiles of A, R, and S.
07
(b) Given the elementary reaction
taking place in a CSTR, show that
07
OR
(b) Given the elementary reaction
taking place in a PFR, show that ?p,opt = 1/k log mean
07
Q.3 (a) Give names of two industrial products produced by catalytic reactions
and the catalysts used therein.
03
(b) Give two chemical equations of catalytic reactions and the catalysts
used therein.
04
(c) List out sequentially the steps involved in gas-solid catalytic reactions
by Langmuir-Hinshelwood approach.
07
OR
Q.3 (a) What is catalyst deactivation? 03
(b) Explain adsorption and desorption in gas-solid catalytic reactions. 04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2017
Subject Code: 2173509/2173514 Date: 10/11/2017
Subject Name: Environmental 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) Make a mole balance on a batch reactor conducting a liquid phase
bimolecular reaction with a reaction rate constant k2 in units of liter,
mol, and min to estimate time required for certain conversion of a
reactant of the reaction.
03
(b) An aqueous feed of A and B (400 liter/min, 100 mmol A/liter, 200
mmol B/liter) is to be converted to product in a plug flow reactor. The
kinetics of the reaction is represented by A + B ? R,
-rA = 200 CACB mol/(liter)(min). Find the volume of reactor needed
for 99.9% conversion of A to product. Draw a schematic diagram.
04
(c) We plan to replace our present mixed flow reactor with one having
double the volume. For the same aqueous feed (10 mol A/liter) and
the same feed rate find the new conversion. The reaction kinetics are
represented by A ? R, -rA = k CA
1.5
, and present conversion is 70%.
Draw a schematic diagram.
07
Q.2 (a) Given the elementary reaction taking place in a batch reactor
and k1 > k2, derive for CA and CR as functions of time, and sketch the
concentration-time profiles of A, R, and S.
07
(b) Given the elementary reaction
taking place in a CSTR, show that
07
OR
(b) Given the elementary reaction
taking place in a PFR, show that ?p,opt = 1/k log mean
07
Q.3 (a) Give names of two industrial products produced by catalytic reactions
and the catalysts used therein.
03
(b) Give two chemical equations of catalytic reactions and the catalysts
used therein.
04
(c) List out sequentially the steps involved in gas-solid catalytic reactions
by Langmuir-Hinshelwood approach.
07
OR
Q.3 (a) What is catalyst deactivation? 03
(b) Explain adsorption and desorption in gas-solid catalytic reactions. 04
2
(c) Describe with neat sketches fixed and fluidized bed catalytic reactors. 07
Q.4 (a) Mention at least two series-parallel reactions of industrial importance.
Define selectivity and overall and instantaneous fractional yields.
07
(b) Describe with appropriate graphical representation the Jones
graphical method to determine concentration in each MFR connected
in a series of unequal sized MFRs.
07
OR
Q.4 (a) Describe the graphical method to determine the best arrangement for
given conversion of unequal sized MFRs connected in a series.
07
(b) Differentiate between physical and chemical adsorption. 07
Q.5 (a) Evaluate the variance for the following distribution.
07
(b) Write the sequence of steps according to shrinking core model for
gas-solid non-catalytic reactions. Draw a schematic figure to show
these steps when reaction A (g) + bB (s) ? products takes place on a
solid spherical particle of unchanging size.
07
OR
Q.5 (a) Plot the exit age distribution E using the following data.
07
(b) Explain with the help of graphs or sketches the following with
reference to RTD.
i. F curve
ii. Impulse function
iii. Mean residence time
3+2+2=
07
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This post was last modified on 20 February 2020