Related Questions

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
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.
A Fixed charges initially
B Running cost of cooling water for condenser
C Vapour & liquid load both
D Running cost of steam for reboiler
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
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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?
A 0
B 1
C ∞
The fixed cost of a distillation column at minimum reflux ratio is
A Minimum
B Infinite
C Optimum
D None of these
The operating cost of a distillation column at minimum reflux ratio is
A Minimum
B Maximum
C Infinite
D Zero
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
For a distillation column operating at minimum reflux, the
A Concentration of liquid and vapour leaving a plate will be same
B Reflux ratio will be maximum
C Number of plates required will be maximum
D None of these

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