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
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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
What is the reflux ratio at total reflux?
A Zero
B Infinity
C Unity
D Data insufficient
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
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
As the reflux ratio in a distillation coloumn is increased from the minimum, the
A Slope of the operating line in stripping section decreases
B Number of plates decreases very slowly first and then more and more rapidly
C Total cost first decreases and then increases
D Liquid flow increases while the vapor flow decreases for a system
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 McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.
A Total
B Minimum
C Operating
D Maximum permissible

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