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Posted By: sunil Member Level: Diamond Posted Date: 04 Sep 2008
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2006 Jawaharlal Nehru Technological University Biotechnology III B.Tech I Semester Regular Examinations, November 2006 MASS TRANSFER AND SEPARATION Question paper
Code No: RR312301 Set No. 2
III B.Tech I Semester Regular Examinations, November 2006
MASS TRANSFER AND SEPARATION
(Bio-Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Obtain an expression for the steady state Equimolal counter diffusion of two gases
starting from fundamentals? [16]
2. (a) Distinguish between Eddy and Molecular Diffusion?
(b) Explain Penetration Theory versus Two Film Theory? [8+8]
3. A liquid mixture containing 50 mole percent n-heptane and 50 mole percent n-
octane is subjected to a differential distillation at atmospheric pressure until the
residual liquid contains 35 mole percent n-heptane. Using the equilibriums data
determine the percentage of feed that is left over as residue.
X 0.50 0.46 0.42 0.38 0.34 0.32
Y 0.689 0.648 0.608 0.567 0.523 0.49
Where x = mole fraction n-heptane in liquid.
Y = mole fraction n-heptane in vapour. [16]
4. Discuss the steps involved in the determination of theoretical number of plates by
Panchon Savarit method? What is Reflux? Explain the method for determining
minimum Reflux by using the above method? [8+8=16]
5. Describe the solubility characteristics of a ternary liquid system with one pair
partially soluble. Indicate the tie lines if the system forms solutrope. [16]
6. (a) Write a short notes on types of adsorption and distinguish between physical
adsorption and chemisorption?
(b) Explain the different industrial adsorbents used and enumerate their applica-
tions? [8+8]
7. Write on:
(a) Adsorption wave and break through curve and
(b) Pressure solving and thermal solving methods. BET Isotherm. [8+8]
8. A liquid containing solute A at a concentration C1 = 3 ×10-2 kg mol/m3 is flowing
rapidly by a membrane of thickness L=3.0×10-5 m. The distribution coefficient
K'=1.5 and DAB = 7.0×10-11m2/s in the membrane. The solute diffuses through
the membrane and its concentration on the other side is C2 = 0.50×10-2kgmol/m3.
The mass transfer coefficient KC1 is large and can be considered as infinite and
KC2=2.02 ×10-5 kmol/m2s mol fraction. Calculate the flux and the concentrations
at the membrane interfaces?
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