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Mass Transfer

Mass Transfer
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

T
T²
√T
1/T

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Mass Transfer
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

Lowering the total pressure
Both A & B
Raising the temperature
Neither A nor B

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Mass Transfer
Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in

Decreased solute solubility
All of these
Large number of trays
Large minimum liquid to gas (L/G) ratio

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Mass Transfer
With increase in the concentration of the adsorbate, the integral heat of adsorption

May increase or decrease ; depends on the type of adsorbate
Remains unchanged
Increases
Decreases

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Mass Transfer
Solvent used in extractive distillation

Forms a high boiling azeotrope
Forms a low boiling azeotrope
Does not alter the relative volatility of the original components
Is of low volatility

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Mass Transfer
Absorption factor is defined as (where, S₁ = slope of the operating line S₂ = slope of the equilibrium curve)

S₂/S₁
S₁ - S₂
S₁/S₂
S₁ x S₂

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