Related Questions

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 case of a continuous distillation column, increase in reflux ratio may result in the
A Lower fixed charges for the column
B Greater cost for the reboiler heat supply
C Greater cost for the condenser coolant
D All of the above
Optimum reflux ratio in a continuous distillation column is determined by the
A Maximum permissible vapour velocity
B Flooding limit of the column
C Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
D None of these
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams
A Increases
B Decreases
C Remains unaffected
D Passes through a maximum
The fixed cost of a distillation column at minimum reflux ratio is
A Minimum
B Infinite
C Optimum
D None of these
In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of
A Area between operating line and 45° diagonal x-y diagram
B Condenser and reboiler surfaces
C Tower cross-section
D None of these
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler
A Increases
B Decreases
C Remains unaffected
D And the heat required in reboiler decreases
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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
Minimum reflux ratio in a distillation column results in
A Optimum no. of trays
B Minimum reboiler size
C Maximum condenser size
D Minimum number of trays
The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is
A 0
B ∞
C 1
D Minimum

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