Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2170501 Chemical Reaction Engineering Ii Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2170501 Date:19/01/2021
Subject Name:Chemical Reaction Engineering - II
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1
(a) Draw the figures for various ways of studying the flow pattern in vessels.
03
(b) Explain: 1) Residence time distribution 2) Dirac delta function 3) Early
04
mixing 4) Micro fluid
(c) Explain Step experiment to study the RTD in non- ideal reactor.
07
Q.2
(a) Discuss closed vessel boundary condition.
03
(b) Derive the equation for E for single stirred tank reactor.
04
(c) A sample of tracer was injected as a pulse to a reaction vessel and the
07
effluent concentration was measured as a function of time resulting in
following data If the reaction vessel is used to carry out liquid
decomposition reaction with rate -rA = kCA, k = 0.1 min-1 , Find the mean
conversion.
T,
0 1 2 3 4
5 6 7 8 9
10 12 14
min
C,
0 1 5 8 10 8 6 4 3 2.2 1.5 0.6 0
gm/
m3
Q.3
(a) Write about C pulse curve.
03
(b) What is Knudson equation? Explain the mechanism of solid catalyzed Gas
04
phase reactions using LHHW model.
(c) Derive BET equation for surface area of catalysts.
07
Q.4
(a) Discuss the effect of Henry's constant value on the solubility of gas in
03
liquid.
(b) Write on `Film conversion parameter'.
04
(c) Define: 1) Catalysts 2) Promoters 3) Inhibitors 4) Poisons 5) Accelerator 6)
07
Coking 7) Sintering
Q.5
(a) Give examples for various fluid fluid reactions.
03
(b) Draw diagram for various contacting pattern in two phase system
04
(c) Air with gaseous A bubbles through a tank containing aqueous Reaction
07
occurs as follows:
1
A (g l) + B (l) R (l) -rA = kCACB k = 10 m3 (mol2. hr)
For this system
kAg a = 0.1 mol/hr. m3. Pa
fl = 0.01 m3 liquid/m3 reactor
kAl a = 100 m3 liquid/m3 reactor. hr
HA = 105 Pa. m3/mol, very low solubility
DAl = DBl = 10--6 m2/hr
a = 100 m2/m3
For a point in the reactor where
pA = 100 Pa and
CB = 1 mol/m3
For MH < 0.02, we have infinitely slow reaction.
(a) calculate the rate of reaction (mol/m3 hr)
(b) Resistance offered by the main body of liquid
Q.6
(a) Write in detail about Progressive conversion model.
03
(b) Discuss the significance of Effectiveness factor for solid catalysed reaction.
04
(c) Discuss in brief about slurry reaction kinetics.
07
Q.7
(a) Write about mean time and variance.
03
(b) Write the significance of Thiele Modulus.
04
(c) For chemical reaction controls, derive expression for relation for time
07
required for unreacted core model for spherical particles of unchanging
size. Also find time required for complete conversion.
Q.8
(a) Give names for the different fluid particle contactors.
03
(b) Discuss about various types of nonideality exists in non-ideal flow reactors.
04
(c) Write in brief about catalysts deactivation.
07
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This post was last modified on 04 March 2021