Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 8th Sem New 2180505 Multicomponent Distillation Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ? SEMESTER - VIII (NEW) EXAMINATION - WINTER 2018
Subject Code: 2180505 Date: 19/11/2018
Subject Name: Multicomponent Distillation
Time: 2:30pm to 5:00pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Write an expression to calculate the number of possible sequences. Calculate the
number of possible sequences for 6 components.
03
(b) Define. (1) Adjacent key component (2) Split key components and (3) non
distributed components. (4) Azeotropic mixture.
04
(c) A distillation column for the separation between propane and n-butane is to have
the following feeds. Data: R / Rmin =1.39.
Use Fensky equation to estimate the number
of stages that should be placed between two feeds. (Refer Chart provided)
Component flow rate (lb mol/hr)
Ethane 2.5 0.5
Propane 14 6
n-Butane 10 18
n-Pentane 5 30
n-Hexane 0.5 4.5
Upper flow Lower flow
Temperature 170 230
Pressure 245 245
07
Q.2 (a) Write a Kirk Bride equation with detail specifications for finding the feed stage
location in multicomponent distillation column.
03
(b) List out various methods used for calculating the number of theoretical stages for
multicomponent distillation.
04
(c) What do you mean by sequencing of multicomponent distillation? How it is
important? Discuss marginal vapour method to determine the best possible
sequence for multicomponent distillation?
07
OR
(c) Write a short note. "Selection criteria for the operating pressure in multicomponent
distillation column.
07
Q.3 (a) Explain in brief. "Jet flooding: 03
(b) What do you mean by optimum reflux ratio. 04
(c) A saturated liquid consisting of phenol and cresols with some xylenols is
fractionated to give a top product of 95.3 mol% phenol. Meta cresol is heavy key
component and phenol is light key component. Total condenser is used. The
composition of the top product and of the phenol is in the bottom are given.
(a) (a) Complete the material balance over the still for a feed rate of 100 kmol / hr.
(b) (b)) Calculate the minimum reflux ratio by Underwood?s method.
Components
?
avg
Feed
(mole %)
Top product
(mole %)
Bottom product
(mole %)
Phenol 1.98 35 95.3 5.24
O-Cresol 1.59 15 4.55 ?
m-Cresol 1.0 30 0.15 ?
Xylenols 0.59 20 - ?
Total 100 100
07
OR
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ? SEMESTER - VIII (NEW) EXAMINATION - WINTER 2018
Subject Code: 2180505 Date: 19/11/2018
Subject Name: Multicomponent Distillation
Time: 2:30pm to 5:00pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Write an expression to calculate the number of possible sequences. Calculate the
number of possible sequences for 6 components.
03
(b) Define. (1) Adjacent key component (2) Split key components and (3) non
distributed components. (4) Azeotropic mixture.
04
(c) A distillation column for the separation between propane and n-butane is to have
the following feeds. Data: R / Rmin =1.39.
Use Fensky equation to estimate the number
of stages that should be placed between two feeds. (Refer Chart provided)
Component flow rate (lb mol/hr)
Ethane 2.5 0.5
Propane 14 6
n-Butane 10 18
n-Pentane 5 30
n-Hexane 0.5 4.5
Upper flow Lower flow
Temperature 170 230
Pressure 245 245
07
Q.2 (a) Write a Kirk Bride equation with detail specifications for finding the feed stage
location in multicomponent distillation column.
03
(b) List out various methods used for calculating the number of theoretical stages for
multicomponent distillation.
04
(c) What do you mean by sequencing of multicomponent distillation? How it is
important? Discuss marginal vapour method to determine the best possible
sequence for multicomponent distillation?
07
OR
(c) Write a short note. "Selection criteria for the operating pressure in multicomponent
distillation column.
07
Q.3 (a) Explain in brief. "Jet flooding: 03
(b) What do you mean by optimum reflux ratio. 04
(c) A saturated liquid consisting of phenol and cresols with some xylenols is
fractionated to give a top product of 95.3 mol% phenol. Meta cresol is heavy key
component and phenol is light key component. Total condenser is used. The
composition of the top product and of the phenol is in the bottom are given.
(a) (a) Complete the material balance over the still for a feed rate of 100 kmol / hr.
(b) (b)) Calculate the minimum reflux ratio by Underwood?s method.
Components
?
avg
Feed
(mole %)
Top product
(mole %)
Bottom product
(mole %)
Phenol 1.98 35 95.3 5.24
O-Cresol 1.59 15 4.55 ?
m-Cresol 1.0 30 0.15 ?
Xylenols 0.59 20 - ?
Total 100 100
07
OR
2
Q.3 (a) Explain in brief. "Downcomer flooding" 03
(b) What do you mean by tray efficiency. List out the methods to determine the tray
efficiency.
04
(c) How to determine vapour liquid equilibrium data? 07
Q.4 (a) Write an equation to determine the minimum reflux ratio for multicomponent
distillation.
03
(b) Explain the selection criteria among various types of trays. 04
(c) Explain in detail. "Steps for Theile- Geddes method for finding theoretical stages of
multicomponent distillation column.
07
OR
Q.4 (a) List out disadvantages of Vacuum distillation? 03
(b) Explain the selection criteria among various types of packings. 04
(c) State the algorithm or steps for Lewis Matheson method to calculate theoretical
stages in rectification section & also state feed tray identification.
07
Q.5 (a) Discuss the batch distillation with rectification. 03
(b) Discuss the applications of heat pumps in distillation column. 04
(c) Differentiate between Azeotropic distillation and extractive distillation. 07
OR
Q.5 (a) Write an expression Bogart equation with all terms. 03
(b) How will you identify feed tray location in Lewis Matheson method in
Multicomponent distillation?
04
(c) Discuss energy saving in distillation column by thermally coupled distillation.. 07
*************
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ? SEMESTER - VIII (NEW) EXAMINATION - WINTER 2018
Subject Code: 2180505 Date: 19/11/2018
Subject Name: Multicomponent Distillation
Time: 2:30pm to 5:00pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Write an expression to calculate the number of possible sequences. Calculate the
number of possible sequences for 6 components.
03
(b) Define. (1) Adjacent key component (2) Split key components and (3) non
distributed components. (4) Azeotropic mixture.
04
(c) A distillation column for the separation between propane and n-butane is to have
the following feeds. Data: R / Rmin =1.39.
Use Fensky equation to estimate the number
of stages that should be placed between two feeds. (Refer Chart provided)
Component flow rate (lb mol/hr)
Ethane 2.5 0.5
Propane 14 6
n-Butane 10 18
n-Pentane 5 30
n-Hexane 0.5 4.5
Upper flow Lower flow
Temperature 170 230
Pressure 245 245
07
Q.2 (a) Write a Kirk Bride equation with detail specifications for finding the feed stage
location in multicomponent distillation column.
03
(b) List out various methods used for calculating the number of theoretical stages for
multicomponent distillation.
04
(c) What do you mean by sequencing of multicomponent distillation? How it is
important? Discuss marginal vapour method to determine the best possible
sequence for multicomponent distillation?
07
OR
(c) Write a short note. "Selection criteria for the operating pressure in multicomponent
distillation column.
07
Q.3 (a) Explain in brief. "Jet flooding: 03
(b) What do you mean by optimum reflux ratio. 04
(c) A saturated liquid consisting of phenol and cresols with some xylenols is
fractionated to give a top product of 95.3 mol% phenol. Meta cresol is heavy key
component and phenol is light key component. Total condenser is used. The
composition of the top product and of the phenol is in the bottom are given.
(a) (a) Complete the material balance over the still for a feed rate of 100 kmol / hr.
(b) (b)) Calculate the minimum reflux ratio by Underwood?s method.
Components
?
avg
Feed
(mole %)
Top product
(mole %)
Bottom product
(mole %)
Phenol 1.98 35 95.3 5.24
O-Cresol 1.59 15 4.55 ?
m-Cresol 1.0 30 0.15 ?
Xylenols 0.59 20 - ?
Total 100 100
07
OR
2
Q.3 (a) Explain in brief. "Downcomer flooding" 03
(b) What do you mean by tray efficiency. List out the methods to determine the tray
efficiency.
04
(c) How to determine vapour liquid equilibrium data? 07
Q.4 (a) Write an equation to determine the minimum reflux ratio for multicomponent
distillation.
03
(b) Explain the selection criteria among various types of trays. 04
(c) Explain in detail. "Steps for Theile- Geddes method for finding theoretical stages of
multicomponent distillation column.
07
OR
Q.4 (a) List out disadvantages of Vacuum distillation? 03
(b) Explain the selection criteria among various types of packings. 04
(c) State the algorithm or steps for Lewis Matheson method to calculate theoretical
stages in rectification section & also state feed tray identification.
07
Q.5 (a) Discuss the batch distillation with rectification. 03
(b) Discuss the applications of heat pumps in distillation column. 04
(c) Differentiate between Azeotropic distillation and extractive distillation. 07
OR
Q.5 (a) Write an expression Bogart equation with all terms. 03
(b) How will you identify feed tray location in Lewis Matheson method in
Multicomponent distillation?
04
(c) Discuss energy saving in distillation column by thermally coupled distillation.. 07
*************
3
K - Value chart
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020