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Download GTU BE/B.Tech 2017 Winter 7th Sem New 21735092173514 Environmental Reaction Engineering Question Paper

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

This post was last modified on 20 February 2020

This download link is referred from the post: GTU BE/B.Tech 2017 Winter Question Papers || Gujarat Technological University


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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION — WINTER 2017

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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.
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  3. Make suitable assumptions wherever necessary.
  4. 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 k> 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 CACg 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!, and present conversion is 70%. Draw a schematic diagram. 07
Q.2 (a) Given the elementary reaction taking place in a batch reactor A—>R—>S 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 k1 k2 A—>R—>S taking place in a CSTR, show that 1 τ = √k1k2 OR 07
(b) Given the elementary reaction A—>R—>S taking place in a PFR, show that Tp.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
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
Time (t, min) Tracer Output Concentration (C, gm/liter fluid)
0 0
5 3
10 5
15 5
20 4
25 2
30 1
35 0
(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 4 (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
Time (t, min) Tracer Output Concentration (C, gm/liter fluid)
0 0
5 3
10 5
15 5
20 4
25 2
30 1
35 0
(b) Explain with the help of graphs or sketches the following with reference to RTD. 3+2+2=07
i. Fourve ii. Impulse function iii. Mean residence time

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This download link is referred from the post: GTU BE/B.Tech 2017 Winter Question Papers || Gujarat Technological University