Subject Code:2160506
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-VI(NEW) — EXAMINATION — SUMMER 2019
Subject Name:Chemical Reaction Engineering - I
Time:10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain: 1) Elementary reaction 2) Molecularity 3) Rate constant. [03]
(b) Derive the equation for half-life using overall order of irreversible reaction. [04]
(c) Derive performance equation for steady state plug flow reactor. [07]
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Q.2 (a) Derive equation for a unimolecular type first order reaction for constant volume batch reactor using integral method. [03]
(b) Evaluate quantitatively the behavior of N equal sized mixed flow reactors in series. [04]
(c) A homogeneous gas reaction A — 3R has a reported rate at 215°C -rA = 10-2CA1/2, [mol/liter sec] Find the space-time needed for 80% conversion of a 50% A, 50% inert feed to a plug flow reactor operating at 215°C and 5 atm (CAo = 0.0625 mol/liter). [07]
OR
(c) Explain recycle ratio and derive the performance equation of recycle plug flow reactors. [07]
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Q.3 (a) Explain space time, space velocity and holding time. [03]
(b) Discuss parallel reaction with example. Also discuss fractional yield, overall yield and selectivity for parallel reaction. [04]
(c) Compare the Integral and Differential method of analysis for analyzing reaction kinetics data. [07]
OR
Q.3 (a) Explain shifting order reaction. [03]
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(b) Discuss autocatalytic reaction with conversion-time and rate-concentration curves. [04]
(c) Discuss optimum temperature progression in detail. [07]
Q.4 (a) Briefly the rules for the best arrangement for the ideal reactors. [03]
(b) Discuss Activation energy and its temperature dependency from Arrhenius Law and Collision Theory. [04]
(c) Using given data in Table, calculate the reactor volume V1 and V2 for the mixed-flow sequence in series. when the intermediate conversion is 40% and the final conversion is 80%. The entering molar flow rate is the 0.867 mol/s. [07]
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X | 0 | 0.1 | 0.2 | 0.4 | 0.6 | 0.7 | 0.8
-rA | 0.0053 | 0.0052 | 0.0050 | 0.0040 | 0.0025 | 0.0018 | 0.00125
OR
Q.4 (a) 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 s for the same result. Find the activation energy of this sterilization process. [03]
(c) Derive an expression for effects of temperature on heat of reaction from thermodynamics. [07]
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Q.5 (a) State the different ways to define the reaction rate [03]
(b) Discuss batch reactor including its advantages and limitations. [04]
(c) Discuss qualitative product distribution for irreversible first order in series. [07]
OR
Q.5 (a) Discuss variable affecting the rate of reaction. [03]
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(b) Experiments show that the reaction between H2(g) and I2(g) to produce HI (g) proceeds with a rate (1/2)d[HI}/dt = k[H2] [I2] Suggest a two step mechanism which is consistent with this rate. [04]
(c) Write short note on ‘Searching for reaction mechanism’. [07]
Date:27/05/2019
Total Marks: 70
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