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

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

1

9

8

10

1

9

8

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Mass Transfer
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

Same as

Lower than

Either same or higher than

Higher than

Same as

Lower than

Either same or higher than

Higher than

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Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Less than the sum of the vapour pressure of the components

None of these

Greater than that computed for ideality

Less than that computed for ideality

Less than the sum of the vapour pressure of the components

None of these

Greater than that computed for ideality

Less than that computed for ideality

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.33

Re0.83

Re

Re0.53

Re0.33

Re0.83

Re

Re0.53

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Mass Transfer
Lewis number (Le) is

Sh x Pr

St x Sh

Pr x St

Sc x Pr

Sh x Pr

St x Sh

Pr x St

Sc x Pr

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

> 1

< 1

1

> 1

< 1

1

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Mass Transfer

Mass Transfer Positive deviation from Raoult's law means a mixture whose total pressure is

Mass Transfer For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Mass Transfer Lewis number (Le) is

Mass Transfer If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Mass Transfer
Lewis number (Le) is

Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is