GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V (New) EXAMINATION - WINTER 2019
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Subject Code: 2150404
Subject Name: Principles of Process Engineering-11
Time: 10:30 AM TO 01:00 PM
Date: 21/11/2019
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Discuss local and overall mass transfer coefficients. 03
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(b) Differentiate between packed tower v/s tray tower. 04
(c) Oxygen (A) is diffusing through carbon monoxide (B) under steady state condition with the carbon monoxide non diffusing. The total pressure is 1 x 10> N/m2, and the temperature 0 °C. The partial pressure of oxygen at two planes 2 mm apart is, respectively 13000 and 6500 N/m? The diffusivity for the mixture is 1.87x10°m?/s. Calculate the rate of diffusion of oxygen in kmol/s through each square meter of the two planes. 07
OR
Q.1 (a) Define: (1) Tie-line (i1) Operating line (ii1) Raffinate 03
(b) What are different types of packing. 04
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(c) Derive Fick’s law of diffusion and explain NA and JA Also prove that For unidirectional binary diffusion JA=-JB. 07
Q.2 (a) Differentiate between direct and indirect mass transfer operations with examples. 03
(b) Discuss construction and working of sparged vessel. 04
(c) Explain the following terms with respect to tray towers: (1) Flooding (i1) Theoretical tray (iii) Coning (iv) Tray spacing 07
OR
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Q.2 (a) Explain counter current‘multiple contact, Shanks system for leaching with neat figure. 03
(b) Explain steps to determine minimum liquid to gas ratio for absorbers. 04
(c) Explain criteria of solvent selection for extraction. 07
Q.3 (a) A packed tower is designed to recover 98% CO, from a gas mixture containing 10% CO, and 90% air using water. A relation y=14x can be used for equilibrium conditions where, y=kgCO,/kg dry air and x=kg CO,/kg water. The water to gas rate is kept 30% more than the minimum value. Calculate the height of the tower if (HTU)QG is 1 meter. 03
(b) Explain preparation of solids for leaching. 04
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(c) Write short note on Bollman extractor. 07
OR
Q.3 (a) Discuss in detail about Film theory for mass transfer coefficient. 03
(b) Explain the following terms with respect to tray towers: (1) weeping (i1) dumping (ii1) tray spacing 04
(c) Write short note on gas absorption with chemical reaction. 07
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Q.4 (a) Explain fick’s law of diffusion. 03
(b) Explain criteria of solvent selection for gas absorption. 04
(c) Write short note on Rotocell extractor with neat sketch. 07
OR
Q.4 (a) Enlist industrial applications of gas absorption and leaching. 03
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(b) Explain different components of tray tower. 04
(c) Explain with a neat sketch the material balance for multi-stage liquid-liquid extraction. 07
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