At minimum reflux ratio for a given separation

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

What is the reflux ratio at total reflux?

A

Zero

B

Infinity

C

Unity

D

Data insufficient

The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

A

Increase

B

Decrease

C

Remains same

D

Depend on saturated boiling point; may increase or decrease

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

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

When a multistage tray tower uses a minimum reflux ratio, it implies

A

Infinite trays and maximum reboiler heat load

B

Infinite trays and minimum reboiler heat load

C

Minimum trays and minimum reboiler heat load

D

Minimum trays and maximum reboiler heat load

For water-ethanol system, the minimum reflux ratio

A

Is computed from the slope of the upper operating line that is tangent to the equilibrium curve

B

Is computed from the intercept of the operating line

C

Cannot be computed

D

Is the optimum reflux ratio

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

At minimum reflux ratio for a given separation

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