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Mass Transfer

Mass Transfer
Free flowing granular materials can be best dried in a __________ drier.

Cylinder
Rotary
Freeze
Drun

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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

10
9
1
8

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Mass Transfer
NSc/NPr is called the

Lewis number
Psychrometric ratio
Stantan number
Sherwood number

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

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

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

K ∝ √D
K ∝ D2
K ∝ D1.5
K ∝ D

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Mass Transfer
Deairation (removal of O₂) of water is done by

Rectification
Adsorption
Absorption
Ion-exchange

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