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
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
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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)
A Less number of trays are required
B Composition of the residue remains unchanged
C More number of trays are required but the residue composition remains unchanged
D More number of trays are required and the residue composition is more dilute in methanol
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
For the same process conditions, the reflux ratio of an unlagged distillation column
A Decreases in winter
B Increases in winter
C Increases in summer
D None of these
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?
A 0
B 1
C ∞
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

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