For a distillation column operating at minimum reflux, the

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

The operating cost of a distillation column at minimum reflux ratio is

A

Minimum

B

Maximum

C

Infinite

D

Zero

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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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

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

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

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

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

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

For a distillation column operating at minimum reflux, the

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