Register Number
SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act,1956)
Course & Branch :B.Tech – CHEM
Max. Marks:80
Title of the Paper :Process Equipment Design & Drawing - II
Sub. Code :619604 (2007-08-09)
Time : 3 Hours
Date :04/05/2012
Session :FN
______________________________________________________________________________________________________________________
1.
PART - A
(10 x 2 = 20)
Answer ALL the Questions
What are the main factors to consider for designing equipment?
2.
What is drying?
3.
State Fourier’s law.
4.
Differentiate Condensers and Reboilers.
5.
State the assumptions made in calculating the number of
theoretical stages using McCabe-Thiele method.
6.
What is meant by pinch point with respect to distillation?
7.
What is meant by adsorption hysteresis?
8.
What is chemical absorption? Give an example.
9.
What are the factors to be considered for the selection of solvent
for extraction process?
10. List the equipments used in liquid-liquid extraction.
PART – B
(5 x 12 = 60)
Answer All the Questions
11. Classify different types of cooling towers and explain any two
types of cooling towers in detail with neat sketch.
(or)
12. A single effect evaporator operates at 0.15 atm absolute pressure.
What will be the heating surface necessary to concentrate
1.2kg/sec of 10% of caustic soda solution to 40%. Assuming a
value of overall heat transfer co-efficient 1500Kcal/ hr m2 0C and
using stream at 1200C. The heating surface is 1.2m below the
liquid level. Design an evaporator.
Given Data:
BPR = 300C
Feed temp. = 1800C
Specific heat of feed = 0.95Kcal/kg0C
λE = 566.2 Kcal/kg
Specific heat of product =0.8 Kcal/kg0C
λS=526.1 Kcal/kg
Temperature of evaporator = 54.2 0C
HE=620 Kcal/kg.
13. Design a1-2 shell and tube heat exchanger to supplying a hot
water for bath in winter in a hotel receiving heat from its kitchen
flue gas at 423 K. assuming all the properties of the flue gas
identical to those of air. 1000 kg /hr of water at 291K. Enters the
shell side of the exchanger 30m3/min of flue gas enters the tubes
at a linear velocity of 6m/s and leaves at 318K. Gas inlet pressure
may be takes as 1atm.
Given Data:
For flue gas at average temperature
Molecular weight = 29
Cp = 0.25Kcal/kgK
K = 0.027Kcal / hr. m.K
μ = 0.021Cp
For water at avg. temperature
K = 0.539 Kcal /hr.m.k
μ = 0.75Cp
Cp = 1Kcal/kg.k.
(or)
14. Explain the different methods of feeding multiple effect
evaporator system with suitable diagram.
15. Explain in detail the determination of minimum reflux ratio and
the number of theoretical plates using Ponchon-Savarit method.
(or)
16. A plant with an annual through out of 0.06 million tons requires a
distillation column to separate an equi molal mixture of methanol
in water available at its boiling point. Design a sieve plate
column and find the number of actual plates for operation at
atmospheric pressure to the reflux ratio of 1.5 times minimum.
Given data:
Overhead product
= 91.4 % moles % methanol
Residue
= 1.5 mole % methanol
Average liquid density
= 870kg/m3
Vapour density at top
= 2.8kg/m3
Vapour density at bottom = 3.1kg/m3
Average liq. Viscosity
= 0.3 X 10-3 kg/m.s
Top column temperature = 340.6K
Bottom column temperature
= 372.6K
Tray spacing
= 60cm
Tray efficiency
= 49%
If the vapour velocity in the column can be calculate by using
brown sowder’s equation.
Vapour velocity (m/s)
= Kv √pl-pv / pv
Kv = 0.0428
Vapour – liquid equilibrium data for methanol and water
system.
X
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Y 0 0.42 0.57 0.66 0.73 0.78 0.83 0.87 0.92 0.96 1
17. Write the fundamental principles of absorption and adsorption,
explain briefly about general design and drawing consideration
for designing an absorption column.
(or)
18. Explain with neat sketch of packed bed adsorption column and
write its merits and demerits.
19. With neat sketch explain the operation of the following extraction
columns
(a) Rotating disc Contactors
(b) Spray Columns.
(or)
20. Explain in details about drawing and design considerations of
rotary drum filter.