Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 8th Sem New 2180505 Multi Component Distillation Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(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:
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
(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
(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
Q.3 (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 in distillation 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
Q.4 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
Q.5 (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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This post was last modified on 20 February 2020