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
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
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
What is the reflux ratio at total reflux?
A Zero
B Infinity
C Unity
D Data insufficient
With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux
A Increases
B Decreases
C Remains same
D May increase or decrease ; depends on system
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

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