Download GTU BE/B.Tech 2019 Summer 8th Sem New 2180505 Multi Component Distillation Question Paper

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BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
Subject Code:2180505 Date:13/05/2019
Subject Name:Multi Component Distillation
Time:10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) List various design options to decrease the energy consumption of distillation. 03
(b) Discuss about the Determination of Optimum Reflux Ratio. 04

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(c) Discuss the equation tearing procedure for multi component distillation. 07

Q.2 (a) Define following terms: Jet flooding, Down comer flooding, Liquid entrainment. 03
(b) Discuss the advantages of vacuum distillation in detail. 04
(c) Explain the method of selection of operating pressure in distillation column. 07
OR

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(c) Discuss the stepwise procedure for process design of multicomponent batch with constant overhead composition. 07

Q.3 (a) Discuss Sequencing of multi component distillation columns. 03
(b) Discuss heuristics for determining favorable sequences in distillation column. 04
(c) Write short note on selection of key components in multi component distillation. 07
OR

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(a) Discuss methods of determination of Vapour-Liquid Equilibrium data. 03
(b) Discuss criteria of selection among the different types of trays used in tray tower. 04
(c) Discuss the use of heat pump with refrigerant indistillation column for energy saving. 07

Q.4 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. Complete material balance. Feed is 25% (by mole) vapor. Assume ideal vapor-liquid-equilibrium. All compositions are mole%. Average relative volatility for n-butane, iSo-pentane, n-pentane and n-hexane is 2.567, 1, 0.762 and 0.236 respectively. For'reflux ratio R=3, Determine the number of theoretical stages required for desired separation by FUG method. 14
OR

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Discuss Lewis-Matheson method for multicomponent distillation. Also explain about how to start the second trial calculation and arrive on final solution. 14

Q.5 (a) What is application of hegstebeck and Geddes equation? Discuss the equation. 03
(b) Write a kirk bride equation with detail specifications for finding the feed stage location in multicomponent distillation column. 04
(c) Distinguish between azeotropic distillation & extractive distillation with suitable examples. 07
OR

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(a) Define following terms: Homogeneous Maximum Boiling Azeotrope, Heterogeneous Minimum Boiling, Entrainer. 03
(b) Discuss the criteria for selection of solvent for extractive distillation. 04
(c) Explain the concept of Heat integration for energy conservation in Distillation column. 07

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