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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ D2
K ∝ D
K ∝ D1.5
K ∝ √D

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Mass Transfer
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas

Decreases
Decreases linearly
Increases
Remains same

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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)

8.25
8.89
6.89
10

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Mass Transfer
The minimum number of theoretical plates is required for achieving a given separation in distillation column with

Zero reflux ratio
Minimum reflux ratio
Total reflux
No reflux

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Mass Transfer
In stripping section of continuous distillation column, the

None of these
Liquid is stripped of high boiler
Liquid is enriched with high boiler
Vapour is stripped of low boiler

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

8
9
10
1

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