GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER - VIII(OLD) EXAMINATION - WINTER 2017
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Subject Code: 180505 Date: 15-11-2017
Subject Name: Multicomponent Distillation
Time: 02:30 pm to 05:00 pm
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Total Marks: 70
Q.1 (a) Define following:
Light key component, Heavy key component, Split key, Adjacent key, Non distributed component, Non key component and Optimum reflux ratio.
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(b) Explain the fixing of operating pressure in distillation column.
Q.2 (a) What are the selection criteria between packed column and tray column?
(b) Write the steps for distillation column design.
OR
(b) A distillation column is to separate 4750 mol/h of feed composed of 37% n-butane, 32% iso-pentane, 21% n-pentane and 10% n-hexane. The column operates at an average pressure of 2 atm a and will produce a distillate product containing 95% n-butane and 5% iso-pentane. The bottom product is allowed to contain no more than 570 mol/h of n-butane. The minimum reflux ratio is 1.45. The average relative volatility of light key component is 2.567.
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(a) Complete the material balance over still.
(b) Calculate number of theoretical stages required for desired separation by FUG method.
Q.3 (a) Explain Jet flooding, Down comer flooding in detail
(b) What are the parameters on the basis of which various types of trays selected explain in detail?
OR
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Q.3 (a) Explain the working principle of Azeotropic Distillation with flow sheet of one industrial application.
(b) Discuss Equation-Tearing Procedure using Tridiagonal matrix algorithm for multicomponent distillation.
Q.4 (a) What is sequencing of distillation column? Explain it with industrial examples.
(b) Explain Lewis Matheson method in detail.
OR
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Q.4 (a) A saturated liquid, consisting of phenol and cresols with some xylenols, is fractioned to give a top product of 95.3 mole % phenol. Metacresol is heavy key and phenol is light key component. Total condenser is used. The compositions of the top product and of the phenols in the bottoms are given.
| Component | Average Feed, mole % | Distillate, mole % | Residue, mole % | Relative Volatility |
|---|---|---|---|---|
| Phenol | 35 | 95.3 | 5.24 | 1.98 |
| O-cresol | 15 | 4.55 | ? | 1.59 |
| m- cresol | 30 | 0.15 | ? | 1.00 |
| Xylenols | 20 | -- | ? | 0.59 |
(a) Complete the material balance over still for the feed rate of 1000 kmol/h.
(b) Calculate minimum reflux ratio by Underwood’s method.
Q.5 (a) Explain energy saving in thermally coupled distillation column.
(b) Explain Theile- Geddes method in detail.
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OR
Q.5 (a) Discuss batch distillation with rectification.
(b) Discuss energy saving in distillation column by heat integration.
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