Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem New 2170501 Chemical Reaction Engineering Ii Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2170501 Date:10/05/2019
Subject Name:Chemical Reaction Engineering - II
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.
MARKS
Q.1 (a) Mention the procedure for tracer experiment for step response. 03
(b) Estimate the vessel E curve equation. We suspect that the tanks-in series
model reasonably represents the flow in the vessel. tin = 220 s and ?
2
in =
100 s
2
; tout = 280 s and ?
2
in = 1000 s
2
04
(c) Describe construction and working of fixed bed reactor with neat diagram. 07
Q.2 (a) Define: 1) Accelerator 2) Promoter 3) Inhibitor 03
(b) Write brief about Micro fluid and Macro fluid. 04
(c) Discuss segregation model with equation of conversion. 07
OR
(c) A sample of tracer is injected to get pulse response of closed vessel. The
effluent concentration is measured with respect to time as per following
table.
Time,
min
0 1 2 3 4 5 6 7 8 9 10 12 14
Conc,
gm/cc
0 1 1 5 8 10 8 6 4 3 2.2 1.5 0.6
Estimate the E curve.
07
Q.3 (a) Draw the sketches for Various ways of studying the flow pattern in vessels. 03
(b) Dilute A diffuses through a stagnant liquid film onto a plane surface
consisting of B, reacts there to produce R which diffuses back into the
mainstream. Derive the overall rate expression for the L/S reaction. A(l) +
B(s) R(l).
04
(c) The concentration of undesirable impurity in air (at 1 bar = 10
5
Pa) is to be
reduced from 0.1% (or 100 Pa) to 0.02% (or 20 Pa) by absorption in pure
water. Find the height of tower required for counter-current operations.
Data
For consistency let us use SI units throughout.
For Packings
k Aga = 0.32 mol/hr. m
3
. Pa
kAla = 0.1 /hr
The solubility of A in water is given by Henry's law constant
HA = p Ai/C Ai = 12.5 Pa. m
3
/mol
The flow rates per meter squared cross section of tower are
Fg/Acs = 1 x 10
5
mol/hr m
2
Fl/Acs = 7 X 10
5
mol/hr. m
2
The molar density of liquid under all conditions is
CT = 56,000 mol/m
3
07
OR
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2170501 Date:10/05/2019
Subject Name:Chemical Reaction Engineering - II
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.
MARKS
Q.1 (a) Mention the procedure for tracer experiment for step response. 03
(b) Estimate the vessel E curve equation. We suspect that the tanks-in series
model reasonably represents the flow in the vessel. tin = 220 s and ?
2
in =
100 s
2
; tout = 280 s and ?
2
in = 1000 s
2
04
(c) Describe construction and working of fixed bed reactor with neat diagram. 07
Q.2 (a) Define: 1) Accelerator 2) Promoter 3) Inhibitor 03
(b) Write brief about Micro fluid and Macro fluid. 04
(c) Discuss segregation model with equation of conversion. 07
OR
(c) A sample of tracer is injected to get pulse response of closed vessel. The
effluent concentration is measured with respect to time as per following
table.
Time,
min
0 1 2 3 4 5 6 7 8 9 10 12 14
Conc,
gm/cc
0 1 1 5 8 10 8 6 4 3 2.2 1.5 0.6
Estimate the E curve.
07
Q.3 (a) Draw the sketches for Various ways of studying the flow pattern in vessels. 03
(b) Dilute A diffuses through a stagnant liquid film onto a plane surface
consisting of B, reacts there to produce R which diffuses back into the
mainstream. Derive the overall rate expression for the L/S reaction. A(l) +
B(s) R(l).
04
(c) The concentration of undesirable impurity in air (at 1 bar = 10
5
Pa) is to be
reduced from 0.1% (or 100 Pa) to 0.02% (or 20 Pa) by absorption in pure
water. Find the height of tower required for counter-current operations.
Data
For consistency let us use SI units throughout.
For Packings
k Aga = 0.32 mol/hr. m
3
. Pa
kAla = 0.1 /hr
The solubility of A in water is given by Henry's law constant
HA = p Ai/C Ai = 12.5 Pa. m
3
/mol
The flow rates per meter squared cross section of tower are
Fg/Acs = 1 x 10
5
mol/hr m
2
Fl/Acs = 7 X 10
5
mol/hr. m
2
The molar density of liquid under all conditions is
CT = 56,000 mol/m
3
07
OR
2
Q.3 (a) Write in brief about trickle bed reactor. 03
(b) Give significance of film conversion parameter. 04
(c) Discuss slurry reactor kinetics in series. 07
Q.4 (a) Give examples for fluid fluid reactions. 03
(b)
Discuss various non ideality that can occur in real reactor.
04
(c) For diffusion through chemical reaction control, derive relation for time
required for unreacted core model for spherical particles of unchanging size;
deduce relation for complete conversion also.
07
OR
Q.4 (a) Discuss the various types of tower and tank contactors for gas ? liquid
reaction.
03
(b) Explain Shrinking core model for spherical particles of unchanging size. 04
(c) Discuss various regimes for fluid fluid reaction for mass transfer and
chemical reaction both having effect on the rate.
07
Q.5 (a) Discuss the effect of Henry?s constant value on the solubility of gas in
liquid.
03
(b) From the first principle prove that for a back mix reactor
(i) E? = e
-?
04
(c) State and explain the steps in heterogeneous catalytic reaction with
schematic diagram.
07
OR
Q.5 (a) Discuss the effectiveness factor for solid catalyzed reaction. 03
(b) Explain the mechanism of solid catalysed reactions. 04
(c) Discuss various method for preparation of catalysts. 07
*************
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This post was last modified on 20 February 2020