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Mass Transfer

Mass Transfer
Free flowing granular materials can be best dried in a __________ drier.

Drun
Cylinder
Freeze
Rotary

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Erosion of the tower
Thermal decomposition of bottoms
Increased relative volatility
Very efficient operation

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Mass Transfer
Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.

Rotary
Freeze
Tray
None of these

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

L/(FG.G)
(G.a)/FG
FG/(G.a)
F/(FG.a)

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

8.89
8.25
6.89
10

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Mass Transfer
For a binary mixture with low relative volatility,

An azeotrope may be formed during distillation
Use steam distillation
Use molecular distillation
Use high pressure distillation

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