11-02-2013, 04:27 PM
M.TECH I SEMESTER REGULAR EXAMINATIONS MARCH 2010 ADVANCED DOWNSTREAM PROCESSING
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1. (a) What is the role of process engineer in Bio-separation Process? Explain in detail with
suitable examples.
(b)Write in detail about the selecting of various unit operations in relation to their separation
factor and the molecular size of the material to be recovered in DSP.
2. (a) Write short notes on classification of cell disruption methods and explain them?
(b) Write briefly about settling flux, transport flux and total flux pertaining to Continuous
Thickener.
3. (a) Write in detail about principles of Centrifugal filtration? Draw a neat figure that shows cake
and liquid radii from the axis of a Centrifugal filter.
(b) Explain rotary drum vacuum filtration equipment with neat sketch.
4. (a) Write short on the fields of applications of liquid-liquid extraction.
(b) solute is recovered from an aqueous solution containing 20% of the solute by weight using
kerosene as the solvent. The distribution of the solute in water and kerosene may be described
by x’=6045y’ where x’ is the kg of solute per kg of water and y' is the kg of solute per kg of
kerosene. Calculate the final concentration in the final raffinate if the extractions done in 3
simple equilibrium contacts using 5kg solvent per kg of initial solution in each stage.
5. (a) Explain briefly the classification of membrane separation processes.
(b)What do you understand by liquid membranes and explain how they differ from
dynamically formed membranes. Name the widely used liquid membrane for desalination.
6. (a) Do the crystals of a substance of size 1 mm have the same solubility in a solvent like the 1
m particles? Can you give a qualitative explanation of any difference?
(b) Describe the construction and working of vacuum crystallizer with neat sketch.
7. (a) A batch of solids is dried from 25 to 6% moisture under conditions identical to those for
which the following applies. The initial weight of the wet solid is 160 kg and the drying
surface is 1 m2/40 kg dry weight. Determine the time for constant rate period. Critical moisture
content is given as 20% and critical rate is 0.3 x 10-3 kg/m2s. All the weights are on dry basis.
(b) Differentiate between wet bulb temperature and adiabatic saturation temperature.