Related Questions

In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.
A 1
B 8
C 80
D 180
Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
A Less than
B More than
C Same as
D Very much less
A claming section before the liquid flows into the downcomer is privided to
A Permit release of entrained vapour in the liquid
B Reduce the discharge fluctuation
C Ensure better vapour-liquid contact
D Cool the liquid before it flows down
Packed column distillation is limited to the column __________ metres.
A [

A. Height

B. Diameter

B Both A & B
C Neither A nor B
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,
A Composition of vapors and that of liquid do not vary throughout the column
B Reboiler load and condenser load are minimum
C The top and bottom compositions are unchanged with and without total reflux
D The top and bottom compositions correspond to the maximum enrichment available
A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they gain meet at the starting point altogether?
A 26 minutes and 18 seconds
B 42 minutes and 36 seconds
C 45 minutes and 38 seconds
D 46 minutes and 12 seconds
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.
A 1.1 to 1.5
B 1.6 to 2
C 2.2 to 2.6
D 2.7 to 3
In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.
A 2.5
B 7.5
C 15
D 20
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
Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).
A 5-10
B 30-80
C 150-250
D 350-400

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