Bubble cap tray is the most commonly used tray in large distillation column, because

A Of its flexibility and nearly constant efficiency under varying conditions of operation
B It incurs less pressure drop as compared to any other try designed for the same duty
C It eliminates the foaming and entrain-ment tendency during operation
D None of these

Correct Answer: Of its flexibility and nearly constant efficiency under varying conditions of operation

Bissoy MCQ
#Chemical Engineering #Process Equipment And Plant Design

Related Questions

For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
A Allowable gas velocity through the slots
B Plate spacing
C Diameter of the column
D All of the above
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency
A Increases
B Decreases
C Remains same
D May increase or decrease ; depends on individual design
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.
A 19
B 38
C 76
D 95
In distillation columns, the number of bubble caps per tray primarily depends upon the
A Allowable liquid velocity
B Allowable gas velocity
C Allowable gas and liquid velocities
D Feed composition
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.
A Molal flow rate of vapour
B Vapour molecular weight
C Pressure and temperature
D All of the above
Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
A High evaporation losses of water
B High pressure drop of the gas
C Difficulty in its fabrication
D None of these
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the
A Liquid gradient on the tray
B Lower skirt clearance
C Lower static submergence
D Small downcomer liquid seal
Bubble cap plate column is
A A finite stage contactor
B Used only for distillation, not for absorption
C A differential stage contactor
D A continuous contactor
Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
A 2.5"
B 0.5"
C 5"
D 50% of the plate spacing
An adequate clearance between the tray and the shell wall of a distillation column is provided to
A Drain the liquid from the tray when the unit is not in operation
B Allow for thermal expansion and facilitate installation
C Avoid back-trapping
D None of these

Next steps