GTU BE/B.Tech 2017 Winter Question Papers || Gujarat Technological University
Subject Name: Environmental Reaction Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION — WINTER 2017
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Subject Code: 2173509/2173514 Date: 10/11/2017Subject Name: Environmental Reaction Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| 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 t = vk1k2 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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