Selectivity of the solvent used in solvent extraction should be

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

A

Extracting solvent is cheaply & abundantly available

B

One of the liquid components is heat sensitive

C

Viscosity of liquid components is very high

D

One of the liquid components has very high affinity towards the solvent

In liquid extraction, if the selectivity is unity, then

A

Separation of the constituents is the most effective

B

No separation will occur

C

Amount of solvent required will be minimum

D

Solvent flow rate should be very low

The solvent used in liquid-liquid extraction should have __________ less than one.

A

Selectivity

B

Distribution co-efficient

C

Both A & B

D

Neither A nor B

The solvent used in liquid extraction should not have high latent heat of vaporisation, because

A

The pressure drop and hence the pumping cost will be very high

B

It cannot be recovered by distillation

C

Its recovery cost by distillation may be prohibitatively high

D

It will decompose while recovering by distillation

Extraction of pencillin employs a __________ extraction coloumn.

A

Centrifugal

B

Packed

C

Plate

D

None of these

With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)

A

Increases

B

Decreases

C

Remains unaffected

D

Increases Linearly

If a high degree of selectivity is desired, then double-tuned circuit should have ___________ coupling

A

Loose

B

Tight

C

Critical

D

None of the above

Solvent used for extraction of oil is

A

Hexane

B

Methyl ethyl ketone

C

Furfurol

D

None of these

Furfural solvent extraction is used for upgrading (by dissolving aromatics)

A

Naphtha

B

Lubricating oils

C

Wax

D

Cracking feedstock

The commonly used solvent in supercritical extraction is

A

Methyl ethyl ketone

B

Water

C

Carbon tetrachloride

D

Carbon dioxide

Selectivity of the solvent used in solvent extraction should be

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