Vinayaka Missions University 2007 B.E Chemical Engineering DISTILLATION COLUMN CONTROL:2008 - Question Paper

B.E. DEGREE exam JULY 08
B.E. (PETROCHEMICAL ENGINEERING)
DISTILLATION COLUMN CONTROL
Time: three Hrs. Max. Marks: 75
part – A
ans all the questions: 10 x two = 20
1. describe Adoptive control
2. describe Feed forward
3. Write a short notes on XB for upsets in F and XF
4. State the different thermodynamic properties of a binary mixture
5. When do you use steam distillation?
6. discuss briefly the use of vapor-liquid equilibrium data.
7. describe the term 'relative volatility' and indicate its importance in
the design of distillation columns.
8. State the assumptions made in McCabe-Thiele method of
estimating the number of stages in a distillation column.
9. describe the term 'number of transfer units' and 'height of transfer
units' in a packed column absorber.
10. Name the methods used for the determination of number of plates
for multicomponent systems.
part – B
ans any 5 Questions: five x five = 25
11. explain about Inferential control schemes for distillation
operation
12. Write a note on Relative Gain Analysis.
13. explain about the classification of control schemes for
distillation operations.
14. elaborate the various equations available for calculating
VLE data? discuss.
15. Write a note on parallel cascade control for distillation
columns.
16. discuss in detail about Thiele Diagram
17. discuss the classification of control schemes for distillation
18. discuss in detail about options of temperature and
measurement to infer composition
part – C
ans any 2 Questions: two x 15 = 30
19. A continuous fractionators is to be designed for separating a
feed mixture containing equivocal amounts of CCl4 and
CS2 to get a top product containing 95% CS2 and bottom
product containing 6% CS2 at one atm pressure. The feed is
saturated vapor and fed at the rate of 5000 kg/hr. A total
condenser is used and reflux is returned to the top plate as a
saturated liquid. The equilibrium data is provided below:
x
0.0
6
0.1
1
0.2
6
0.3
9
0.5
3
0.6
6
0.7
6
0.8
6
1
y
0.1
6
0.2
7
0.5
0
0.6
3
0.7
5
0.8
3
0.8
8
0.9
3
1
(i) Determine the flow rate of top and bottom product
(ii) compute the theoretical number of trays needed if a reflux
ratio of two times Rm is used.
(iii) Locate the feed tray.
20. discuss in detail, the method of estimation of number of stages by
Mc Cabe - Thiele method.
21. discuss in detail about Distillation Operations

Earning:   Approval pending.