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Mass Transfer

Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D1.5
K ∝ D2
K ∝ √D
K ∝ D

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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
10
6.89
8.25

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Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Total
Operating
Minimum
Maximum permissible

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Mass Transfer
__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

Furfural
Hexane
Benzol
Butyl acetate

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

94 min
15 min
71 min
51 min

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Mass Transfer
Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.

None of these
Baffle
Packed
Plate

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