Equipment for Gas-Liquid Operations

This quiz contains multiple-choice problems on the concepts of gas-liquid equipment.

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The mass transfer by convection can take place under how many conditions?

1 2 3 4

Which of the following equipment is ideal for the multistage countercurrent gas dispersed operation?

Agitated vessel

Sparged vessel

Tray tower

Wetted wall column

During gas dispersion, if a chemical reaction between gas and liquid phase is needed, then the preferred equipment is

Agitated vessel

Sparged vessel

Tray tower

Wetted wall column

The fraction of volume occupied by the gas-liquid mixture in the equipment/vessel to the volume occupied by the gas is

Liquid holdup

Gas holdup

Gas-liquid holdup

None of the above

In a sparged vessel of area 50 cm, the gas flow rate is 2 cubic meters per second. Then the value of superficial gas velocity in meters per second is

In a sparged vessel of area 50 cm and a gas holdup of 3 cubic meters per cubic meters, the flow rate of the gas is 5 cubic meters per second. The value of true gas velocity in meters per second is

1.11

2.22

3.33

4.44

What is the diameter of an air-water system’s bubble in a sparged vessel with a gas holdup of 0.1 and a liquid flow rate of 0.15 meters per second?

7.786 x10^-3

7.786 x10^-4

9.832 x10^-3

9.832 x10^-4

If the velocity of gas is low in a bubble column, then bubble diameter is equal to

Vessel

Sparger orifice

Volume of vessel/interfacial area

None of the above

The relative velocity of gas and liquid inside the bubble column of cross sectional area 0.2 meters with gas holdup of 0.736 is 3.6 meters squared per second. The expected slip velocity is

3.6 m/s

4.89 m/s

7.2 m/s

9.78 m/s

What is the interfacial area of a bubble with a gas volume of 2.5 x10^(-3) cubic meters and diameter of 0.125 cm?

2 m^2

4 m^2

6 m^2

12 m^2

Which of the following processes require an agitated vessel?

Vegetable oil hydrogenation

Production of penicillin