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You need to login to ask any Questions from chapter Interphase-Mass-Transfer of Mass-Transfer

Chapter:

Interphase-Mass-Transfer

1. According to Raoult’s law, for a pure component solution partial pressure is equals to

Total pressure Vapour pressure Atmospheric pressure Mole fraction of respective phase

Vapour pressure

Generally, Raoult?s law states that equilibrium partial pressure of a component at certain conditions equals product of mole fraction and vapour pressure. For a pure component (i.e.) mole fraction equals one.
Therefore, partial pressure equals vapour pressure.

Hint Answer

2. Have a look on below diagram

$Have a look on below diagram\r\n \r\n Here, DE and DP are operating line. Also Y and X are concentrations in mole ratio for gas and liquid phase.\r\nIt’s clearly a representation of an absorber. For operating line DE minimum liquid is required$

Here, DE and DP are operating line. Also Y and X are concentrations in mole ratio for gas and liquid phase.
It’s clearly a representation of an absorber. For operating line DE minimum liquid is required

True False

False

DP line requires minimum liquid because composition is increased to X2.

Hint Answer

3. The equilibrium characteristics of solubility of a gas in liquid helps to determine

Rate Concentration Time No existence of equilibrium characteristics

Rate

The equilibrium diagram helps to determine flux with help of mass transfer co-efficient and concentration gradient.

Hint Answer

4. Find improper characteristic of ideal solution.

The average intermolecular force of attraction and repulsion are unchanged on mixing Volume varies linearly with compositions No evolution of heat The total partial pressure varies linearly with compositions

The total partial pressure varies linearly with compositions

Because vapour pressure only varies linearly with compositions.

Hint Answer

5. Find slope of operating line

$Find slope of operating line\r\n \r\nHere, concentrations are represented in mole ratio. The value of (Y1-Y2)/(X1-X2) =2. Find slope of operating line.$

Here, concentrations are represented in mole ratio. The value of (Y1-Y2)/(X1-X2) =2. Find slope of operating line.

1 2 3 Infinity

2

For a counter current process, Y1- Y2 = Ls/Gs(X1-X2)
Ls/Gs= slope of operating line = 2.

Hint Answer

6. Find rate of non-diffusing solute, if mole fraction of gas phase is 0.65 and diffusing rate is 70 moles/hr.

2 4.5 moles/hr 200 moles/hr 18.18 moles/hr 37.7 moles/hr

2 4.5 moles/hr

Gs= G(1-y)
=70 x(1-0.65)
=24.5 moles/hr.

Hint Answer

7. Match following
1) Hendry’s law – a)Ideal solution
2) Dalton’s law – b)Non- Ideal solution
3) Raoult’s law -c)Sum of partial pressure

1- ( b ), 2-( c ),3-( a ) 1-( a ),2-( b ),3-( c ) 1-( c ),2-( b ),3-( a ) 1-( a ),2-( c ),3-( b )

1- ( b ), 2-( c ),3-( a )

Dalton proved a generalized equation states that total pressure is equals to sum of partial pressure of components. Raoult?s law is applicable for only ideal solution since partial pressure is equals to product of mole fraction and vapour pressure.

Hint Answer

8. For Absorber design, plotting with mole ratio helps to find

Slope of operating line Slope of equilibrium curve Minimum number of trays Maximum number of trays

Slope of operating line

The plot with mole fraction will give an operating line as a curve; it will be very difficult to find slope of operating line. Therefore use of mole ratio plot will give us a liner operating line.

Hint Answer

9. Find false statement for better choice of absorbent.

Gas solubility should be high Vapour pressure should be low Viscosity should be high Low freezing point

Vapour pressure should be low

For a better choice of absorbent, viscosity should be low to get rapid absorption rates, low pressure drops in absorption tower.

Hint Answer

10. Stripper= (1/X)
Find X?

Condenser Reboiler Absorber Sprayer

Absorber

Stripper is liquid to gas transfer but absorber is gas to liquid transfer.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Mass-Transfer

Modes and Diffusion

Modes and Diffusion

Interphase Mass Transfer

Interphase Mass Transfer

Equipment for Gas-Liquid Operations

Equipment for Gas-Liquid Operations

Humidification Operations

Humidification Operations

Gas Absorption

Distillation

Liquid Extraction

Liquid Extraction

Drying

Leaching and Mass Transfer Co-efficients

Leaching and Mass Transfer Co-efficients

Diffusion in Solids and Molecular Diffusion in Fluids

Diffusion in Solids and Molecular Diffusion in Fluids

Topics

This Chapter Interphase-Mass-Transfer consists of the following topics

Gas Absorption

According to Raoult’s law, for a pure component solution partial pressure is equals to

Have a look on below diagram

$Have a look on below diagram\r\n \r\n Here, DE and DP are operating line. Also Y and X are concentrations in mole ratio for gas and liquid phase.\r\nIt’s clearly a representation of an absorber. For operating line DE minimum liquid is required$

Here, DE and DP are operating line. Also Y and X are concentrations in mole ratio for gas and liquid phase.
It’s clearly a representation of an absorber. For operating line DE minimum liquid is required

;

The equilibrium characteristics of solubility of a gas in liquid helps to determine

Find improper characteristic of ideal solution.

Find slope of operating line

$Find slope of operating line\r\n \r\nHere, concentrations are represented in mole ratio. The value of (Y1-Y2)/(X1-X2) =2. Find slope of operating line.$

Here, concentrations are represented in mole ratio. The value of (Y1-Y2)/(X1-X2) =2. Find slope of operating line.

;

Find rate of non-diffusing solute, if mole fraction of gas phase is 0.65 and diffusing rate is 70 moles/hr.

Match following
1) Hendry’s law – a)Ideal solution
2) Dalton’s law – b)Non- Ideal solution
3) Raoult’s law -c)Sum of partial pressure

For Absorber design, plotting with mole ratio helps to find

Find false statement for better choice of absorbent.

Stripper= (1/X)
Find X?

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