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Mass Transfer

Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

1
-1
- ve
+ ve

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Mass Transfer
Stage efficiency in a leaching process depends on the

Vapour pressure of the solution
Both A & B
Time of contact between the solid and the solution
Rate of diffusion of the solute through the solid and into the liquid

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Mass Transfer
Sand is dried in foundaries in a___drier.

Vacuum
Rotary
Fluidisedbed
Spray

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Mass Transfer
Steam distillation is used to separate

Heat sensitive materials
High boiling substances from nonvolatile impurities
Azeotropes
Mixtures of low relative volatility

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Mass Transfer
Very tall packed towers are divided into series of beds to

Avoid flooding
Avoid channelling
Reduce the overall pressure drop
Reduce liquid hold-up

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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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