GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VI (NEW) EXAMINATION - WINTER 2020
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Subject Code:2160506 Date:03/02/2021
Subject Name:Chemical Reaction Engineering - I
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
- (a) Discuss the classification of Chemical Reaction based on Thermodynamics and Stoichiometry with suitable examples of each. (03)
- (b) Define Rate of Reaction based on various component and also gives comparison of its. (04)
- (c) Derive an expression showing effects of temperature on heat of reaction from thermodynamics. (07)
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- (a) What is rate equation? Also mention unit of rate of reaction and rate constant for first, second and third order elementary chemical reactions. (03)
- (b) Milk is pasteurized if it is heated to 63°C for 30 min, but if it is heated to 74°C it only needs 15 sec for the same result. Find the activation energy of this sterilization process. (04)
- (c) Discuss the Activation energy and Temperature dependency of rate constant. (07)
- (a) Define zero order reaction with suitable example. (03)
- (b) Discuss the method for rate equation interpretation of irreversible unimolecular first order elementary reaction by integral method of analysis. (04)
- (c) Experimental studies of a specific decomposition of A in a batch reactor using pressure units show exactly the same rate at two different temperatures: (07)
At 400K -1, = 2.3 P?
At 500K —1, = 2.3 P?
Where unit of —ra is mol/m3.sec and unit of P4 is atm.--- Content provided by FirstRanker.com ---
(a) Evaluate the activation using these units
(b) Transform the rate expression into concentration units and then evaluate the activation energy.
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- (a) Discuss the chemical reaction classification based on molecularity with suitable examples of each. (03)
- (b) Discuss the differential method for interpretation of rate equation of n' order unimolecular chemical reaction. (04)
- (c) The first order reversible liquid reaction (07)
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takes place in a batch reactor. After 8 minutes, conversion of A is 33.3% while equilibrium conversion is 66.7%. Find the rate equation for this reaction.
- (a) Compare batch reactor and steady state flow reactors. (03)
- (b) Discuss the space velocity and space time for steady state flow reactors. (04)
- (c) An aqueous feed of A and B (44 liter/min, 100mmol A/liter, 200mmol B/liter) is to be converted to product in a plug flow reactor. The kinetics of the reaction is represented by (07)
A+B—R, —14 =200 C;Cp--- Content provided by FirstRanker.com ---
Find the volume of reactor needed for 99.9% conversion of A to product.
- (a) Compare between space time of mixed flow reactor and time constant in mixing process without chemical reaction. (03)
- (b) Compare ideal batch reactor performance of constant and variable density reaction. (07)
- (c) At 650 °C phosphine vapor decomposes as follows: (03)
4PH3 — P4(g) +6Ha, —Tphos = (10 hr_l)(,'ph,,S--- Content provided by FirstRanker.com ---
What size of plug flow reactor operating at 649°C and 11.4 atm is needed for 75% conversion of 10 mol/hr of phosphine in a 2/3 phosphine and 1/3 inert feed?
- (a) Discuss autocatalytic reactor. (04)
- (b) Prove that N number of plug flow reactor connected in series and its total volume V gives the same conversion as a single plug flow reactor of volume V. (07)
- (c) Derive the performance equation for steady state mixed flow reactor for constant and variable-density system and compare its graphical representation. (03)
- (a) Differentiate between homogeneous reaction and heterogeneous reaction. (04)
- (b) Discuss the effect of temperature and composition on single homogeneous reaction. (07)
- (c) Derive the performance equation of recycle reactor and discuss tis graphical representation for constant and variable density. (03)
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