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Posted By: santosh kumar kanugula Member Level: Gold Posted Date: 28 Jun 2008
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2007 Jawaharlal Nehru Technological University B.Tech Chemical engineering MASS TRANSFER OPERATIONS-II Question paper
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Code No: RR320801 Set No. 4
III B.Tech II Semester Regular Examinations, Apr/May 2007
MASS TRANSFER OPERATIONS-II
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) A liquid mixture of
i. 50 mole% n-heptane
ii. and 50 mole% n-octane
were subjected to di erential distillation at atmospheric pressure with 70
mole% of the liquid distilled. Compute the composition of the composite
distillate and the residue.
“x” 1.00 0.50 0.46 0.42 0.38 0.34 0.32 0.00
“y” 1.00 0.689 0.648 0.608 0.567 0.523 0.497 0.00
(b) What is relative volatility? How is it computed? [12+4]
2. A saturated liquid feed containing 40 mole % chloroform and 60 mole % benzene is
fed to a continuous fractionating column to yield a distillate and residue product
with 95 mole % chloroform and 95 mole % benzene respectively. The VLE data
may be represented by the following relationship.
y = 1.29x + 0.25x
2 - 0.54x
3
x, y - mole fractions of chloroform in the liquid and vapor. Determine
(a) The minimum number of plates
(b) The number of plates when the reflux ratio is such as to make the operating
line slope = 1.18. [16]
3. Discuss the principles of extractive and azetropic distillation and their relative
scope. Indicate the flow diagram for typical industrial applications of either type.
What is the basis for selection of separating agents used. [16]
4. Write about the system of three liquids - two pairs partially soluble with the help
of an equilibrium diagram. Give examples. Also discuss the e ect of temperature
on the above system. [16]
5. A mixture containing 40% p-chloronitrobenzene (B) and 60% 0-chloronitrobenzene
(C) is to be separated at the rate of 100 kg/h into products containing 80 and 15%
respectively, of the para isomer after removal of solvents. The insoluble solvents to
be used are 2400 kg/h heptane (A) and 2760 kg/h aqueous methanol (D). The dis-
tribution coecients are constant and independent, yB’*/xB’ = 1.35 and yC’*/xC’
= 0.835. Determine the number of theoretical stages required. [16]
6. Explain Continuous-Countercurrent Decantation (CCD).
1 of 2
Code No: RR320801 Set No. 4
(a) with simple flow sheet
(b) flow sheet with intermediate agitation and filtration of washed solids.
[8+8]
7. (a) Explain about the theories of adsorption
(b) Discuss about the nature and characteristics of adsorbents used in industry.
List at least four industrial absorbents.
(c) What is absorption hysterisis? [4+8+8]
8. (a) Explain about gas drying equipment?
(b) What are hypersorbers? Explain in detail. [8+8]
? ? ? ? ?
2 of 2
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