Concentration polarization in an electro dialysis cell. 4. Describe with a neat flow diagram, Reverse Osmosis plant for
Code No: 420802
Set No. IV-B.Tech. II Semester Examinations April, 2003
1
MEMBRANE TECHNOLOGY (Chemical Engineering)
2.a) b)
Discuss the importance and operating principle of Ultra Filtration with a neat sketch. Discuss in brief industrial applications of ultra filtration.
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1.a) b)
Max. Marks: 80 Answer any FIVE questions All questions carry equal marks --What is ultra filtration? Describe its operating principle with a neat sketch? Write some of the applications of ultra filtration.
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Time: 3 Hours
Write short notes on: a) Membrane efficiency of an ion exchange membrane b) Concentration polarization in an electro dialysis cell.
4.
Describe with a neat flow diagram, Reverse Osmosis plant for demineralisation of brackish water.
5.
What are the important features of concentration polarization in membrane separations?
6.
What are the ideal flow patterns in membrane separations for gases in the case of: a) Complete mixing model b) Cross flow model c) Counter current flow model d) Co current flow model.
7.
Explain the principles of the following: a) Osmosis b) Reverse Osmosis.
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3.
Discuss briefly the structure of electrodialysis How do you determine the required membrane surface area? How do you estimate the power consumption?
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8.a) b)
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Set No. Code No: 420802
2
IV-B.Tech. II Semester Examinations April, 2003 MEMBRANE TECHNOLOGY (Chemical Engineering) Time: 3 Hours
Answer any FIVE questions All questions carry equal marks --Discuss how you determine the current density and the limiting current density in the electro dialysis.
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1.
Max. Marks: 80
Discuss in detail the phenomena of Osmosis and reverse osmosis.
3.a) b)
What is Electro dialysis? Describe its principle of separation with a neat diagram. Write some of its important applications.
4.
Discuss salient feature of Micro Filtration and Mechanical Filtration. Compare them from various aspects.
5.
Write in detail about the following micro filtration membranes: a) Membranes from solids b) Ceramic membranes c) Track etches membranes d) Chemical phase inversion membranes.
6.a)
Explain single stage ‘feed and bleed’ and multiple stage ‘feed and bleed’ system in reverse osmosis’s along with a neat diagram.
7.
Explain the effect of diffusion in the phenomenon of concentration polarization.
8.
Derive the equations for complete mixing model for multi – component mixtures and also propose the procedure to solve the equations.
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2.
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Code No: 420802
Set No. IV-B.Tech. II Semester Examinations April, 2003
3
MEMBRANE TECHNOLOGY (Chemical Engineering)
1.
Max. Marks: 80
Answer any FIVE questions All questions carry equal marks --Explain the principles of the following: i) Osmosis ii) Reverse Osmosis.
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Time: 3 Hours
Write short notes on: a) Electro dialysis membranes. b) Applications of electro dialysis. c) Ion exchange membrane.
3.a)
How do you separate the mixture of gases using membranes? Explain its operating principle. Describe its industrial applications.
b)
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2.
Enlist various types of membranes used for separation What are the various membranes used in Reverse Osmosis and Ultra Filtration.
5.
Write short notes on the following liquid membranes a) Emulsion liquid membranes b) Supported liquid membranes
6.a) b)
Write about pretreatment of feed in Reverse osmosis and Nanofiltration Explain the process configuration with respect to osmotic pinch effect and brine staging.
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4.a) b)
Explain the consequence of polarization differ in the different membrane separation techniques.
8.
What are the process variables in gas separations by membranes ? How they effect the process?
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7.
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Set No. Code No: 420802
4
IV-B.Tech. II Semester Examinations April, 2003 MEMBRANE TECHNOLOGY (Chemical Engineering) Time: 3 Hours
Max. Marks: 80
2.
Discuss in detail the phenomena of Osmosis and reverse osmosis.
3.a) b)
Briefly describe Donnan dialysis Explain the pump energy requirements and cost of Electro dialysis.
4.
Discuss the various equilibrium governed separation process for the separation of homogeneous and heterogeneous mixture.
5.
Write short notes on the preparation of following membranes used in separation process : a) Asymmetric membranes b) Dynamically formed membranes.
6.a)
Explain how the Reverse osmosis process in applied in the carbonated beverages plant . Briefly describe the various types of membrane used in reverse osmosis plant.
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What is the effect of concentration polarization on complete mixing model for reverse osmosis?
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7.
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b)
Explain the phenomenon of hydrogen recovery from purge gas in low pressure methanol plant.
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8.
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1.
Answer any FIVE questions All questions carry equal marks --Write short notes on: a) Ion exchange membranes b) Applications of electro dialysis c) Variations of electrodialysis.
