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11657 : Chemical Engineering Operations - II : Mass Transfer - II : 7 CH 01
Pages: 3 AW -3376
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Time : Three Hours Max. Marks : 80
Notes : Answer Three questions from Section A and Three questions from Section B.
- Due credit will be given to neatness and adequate dimensions.
- Assume suitable data wherever necessary.
- Diagrams and chemical equations should be given wherever necessary.
- Illustrate your answer necessary with the help of neat sketches.
- Discuss the reaction, mechanism wherever necessary.
- Cell phones are not permitted.
- Use of pen Blue/Black ink/refill only for writing the answer book.
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SECTION - A
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- a) Distinguish between distillation and liquid -liquid extraction in brief. 7
b) Explain how does the term relative volatility (a) of distillation is analogous to selectivity (ß) in liquid-liquid extraction operation? State it's significance in respective mass transfer operation. 6
OR
- a) Define the terms distribution coefficient and distribution constant in dilute solutions at equilibrium. 6
b) Describe continuous multistage cross current extraction system for immiscible solvents with the help of schematic diagram. How would you determine number of stages required using graphical construction method? 7
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- a) A solution containing 5% acetaldehyde and 95% toluene is to be extracted with water (solvent) in a five (5) stage cross current extraction unit to extract acetaldehyde. Toluene and water are immiscible. If 25 kg of water each time are used per 100 kg of feed calculate the amount of acetaldehyde extracted and the final concentration of the exit (raffinate) solution. 8
The equilibrium relationship is given as Y =2.20 X
Where
Y= kg of acetaldehyde/ kg of water
X = kg of acetaldehyde/ kg toluene.--- Content provided by FirstRanker.com ---
b) Describe with the help of neat sketch the working of stage type extractor - mixer settler. 6
OR
- a) A feed containing 35% mass-trimethylamine (TMA) and 65% water is to be extracted using benzene as the solvent. A three stage cross current extraction system is suggested. The amounts of (98% benzene, 2% TMA) to be used in successive stages are 815 kg. 950 kg and 2625 kg. Determine the fraction of solute removed if the stages are ideal. The compositions of the raffinate and extract phases as well as the tie line data are given below - 14
Water - A
Benzene - B--- Content provided by FirstRanker.com ---
Trimethylamine (TMA) - C
Equilibrium data:-
(Raffinate ) water -rich
phase--- Content provided by FirstRanker.com ---
(Extract) Benzene rich
phase
Tie line data
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