Pick out the wrong statement about distillation operation

Process Equipment and Plant Design
Pick out the wrong statement about distillation operation

In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other

In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation

Distillation under vacuum is a substitute for steam distillation

Flash distillation, differential distillation & steam distillation are all continuous distillation processes

In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other

In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation

Distillation under vacuum is a substitute for steam distillation

Flash distillation, differential distillation & steam distillation are all continuous distillation processes

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Process Equipment and Plant Design
Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

20

35

5

55

20

35

5

55

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Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)2/3

(1.2)3/2

(1.2)3/5

(1.2)5/3

(1.2)2/3

(1.2)3/2

(1.2)3/5

(1.2)5/3

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Process Equipment and Plant Design
Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.

0 to 0.08

0 to 1.5

0 to 0.8

0 to 2.2

0 to 0.08

0 to 1.5

0 to 0.8

0 to 2.2

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Process Equipment and Plant Design
Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)

Η = 24.6 (Δp/μ)

Η = 1.66 - 0.25 log μ

Η = 0.25 log μ - 1.67

Η = 17 - 61.1 log μ

Η = 24.6 (Δp/μ)

Η = 1.66 - 0.25 log μ

Η = 0.25 log μ - 1.67

Η = 17 - 61.1 log μ

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Both the functions of condensation & sub cooling are carried out in a single unit

Sub cooling of condensate is desired

Only the function of condensation is to be carried out

Hydrostatic head is required for refluxing the condensate

Both the functions of condensation & sub cooling are carried out in a single unit

Sub cooling of condensate is desired

Only the function of condensation is to be carried out

Hydrostatic head is required for refluxing the condensate

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Process Equipment and Plant Design

Process Equipment and Plant Design Pick out the wrong statement about distillation operation

Process Equipment and Plant Design Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

Process Equipment and Plant Design To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

Process Equipment and Plant Design Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.

Process Equipment and Plant Design Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Process Equipment and Plant Design
Pick out the wrong statement about distillation operation

Process Equipment and Plant Design
Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

Process Equipment and Plant Design
Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.

Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when