In rectifying section of a continuous distillation column, the

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

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

What is the slope of the operating line in the rectifying section of a distillation coloumn?

A

0

B

∞

C

> 1

In stripping section of continuous distillation column, the

A

Liquid is stripped of high boiler

B

Liquid is enriched with high boiler

C

Vapour is stripped of low boiler

D

None of these

As the reflux ratio increases, the slope of the operating line for rectifying section

A

Increases

B

Decreases

C

Remains constant

D

Data insufficient, cannot be predicted

Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

A

Relative volatility is close to one (e.g., separation of close boiling isomers)

B

Feed is not at its bubble point

C

Number of equilibrium stages in only stripping section is to be calculated

D

Number of equilibrium stages required is likely to be very small

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

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 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

In rectifying section of a continuous distillation column, the

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