Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

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

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

Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

A

Relative volatility is reasonably constant

B

Mixture (to be separated) shows negative deviation from ideality

C

Mixture (to be separated) shows positive deviation from ideality

D

Multicomponent distillation is involved

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

In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

A

Saturated feed is not used

B

An azeotrope forms

C

The latent heat of vaporisation of the more and less volatile components are greatly different

D

A total condenser is used

Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method?

A

Partial condenser

B

Total condenser

C

Reboiler

D

Both B and C

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

A

Sensible heat changes are negligible compared with latent heat changes

B

Molar latent heats of all components are equal

C

Heat of mixing is negligible

D

None of these

Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

A

Constant molal overflow

B

Total reflux

C

Constant relative volatility

D

All of the above

The minimum number of theoretical plates is required for achieving a given separation in distillation column with

A

No reflux

B

Total reflux

C

Zero reflux ratio

D

Minimum reflux ratio

At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?

A

0

B

1

C

∞

Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

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