McCabe-Thiele method of binary distillation does not assume that the

Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

A

Sorel-Lewis method

B

McCabe-Thiele's method

C

Ponchon-Savarit method

D

None of these

Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

A

Sensible heat changes for vapour & liquid are negligibly small

B

Reflux is not a saturated liquid

C

Molar latent heat of the two components are equal

D

Heat of mixing of normal liquid is assumed to be zero

Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?

A

Cost

B

Availability

C

Toxicity

D

Selectivity

If the amount of the steam used in steam distillation is increased, the temperature of distillation

A

Increases

B

Decreases

C

Remains unchanged

D

Depends on relative volatility

Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).

A

5-10

B

30-80

C

150-250

D

350-400

In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of

A

Area between operating line and 45° diagonal x-y diagram

B

Condenser and reboiler surfaces

C

Tower cross-section

D

None of these

Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

A

Unidirectional diffusion from liquid to gas phase

B

Unidirectional diffusion from gas to liquid phase

C

Either A or B

D

A counter diffusion at an almost equal molar rate

The-relative volatility for separation of a non-ideal binary mixture by distillation should be

A

0

B

1

C

> 1

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

Flash distillation is suitable for separating the constituents of a binary system, which

A

Form minimum boiling azeotrope

B

Have very wide boiling points

C

Have very close boiling points

D

Form constant boiling azeotrope

McCabe-Thiele method of binary distillation does not assume that the

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