# Concepts of Gas Absorption Relating to Mass Transfer

This quiz contains multiple-choice problems on absorption concepts for operating lines, gas absorption principle and absorption tower design.

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

Rate Concentration Time No existence of equilibrium characteristics

Which of the following is not an example of ideal solution?

Solution of benzene in toluene Solution of ethyl and propyl alcohol Paraffin hydrocarbon gas in paraffin oil Solution of isobutane and olefins

Solubility of a gas increases with increase in temperature.

True False

Spray tower is a __ process.

Co-current

Countercurrent

Continuous

Batch

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

2 4.5 moles/h

200 moles/h

18.18 moles/h

37.7 moles/h

Lower density materials are sent through the bottom, and higher density materials are sent through the top in an absorber. True or false?

True

False

If the operating line touches the equilibrium line, separation is possible in an absorber. True or false?

True

False

Which of the following is a false condition for the ideal absorbent choice?

Gas solubility should be high

Vapour pressure should be low

Viscosity should be high

Low freezing point

Which of the following equations indicate Hendry’s law?

Y = (p/P)

Y = (p*P)

p = (Y/P)

p = (Y*P)

For the absorber design, plotting with mole ratio helps to find the

Slope of operating line

Slope of equilibrium curve

Minimum number of trays

Maximum number of trays

Gas absorption is transferring solute components from liquid solvent to gas mixture. True or false?

True

False

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

Total pressure

Vapour pressure

Atmospheric pressure

Mole fraction of respective phase

Find the improper characteristic of the ideal solution out of the following.

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 minimum non-diffusing liquid flow rate is 20 moles/hr, and for an absorber, the non-diffusing gas flow rate is 30 moles/hr. As the actual liquid flow rate is 2.5 times the minimum, find the slope of the operating line.

4.25

3.75

2.67

1.67

What is the value of X if stripper = (1/X)?

Condenser

Reboiler

Absorber

Sprayer

Quiz/Test Summary
Title: Concepts of Gas Absorption Relating to Mass Transfer
Questions: 15
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