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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Toor and Marchello
Stefan
Fick
Danckwerts

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Mass Transfer
Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.

Bubble cap column
Packed tower
Agitated vessel
Sieve tray column

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P0.5
D ∝ 1/P1.5
D ∝ 1/P
D ∝ P0.5

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Mass Transfer
In the constant rate period of the rate of drying curve for batch drying,

Surface evaporation of unbound moisture occurs
None of these
Cracks develop on the surface of the solid
Rate of drying decreases abruptly

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 + Ri) = Ro/Ri
(1 + Ro) = Ro/Ri
(1 - Ri) = Ro/Ri
(1 - Ro) = Ro/Ri

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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)

10
8.25
8.89
6.89

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