separation process

Question 1

Rose oil is extracted from rose leaves using what type of distillation

Answer 1

steam distillation

Question 2

When the solvent dissolves very little of solute then

Answer 2

large quantity of solvent is required to extract the solute

Question 3

The triangle whose one corner coincides with the enriching line and the outer corner is on the stripping line is called the

Answer 3

feed plate

Question 4

Flash distillation is suitable for the separation of components

Answer 4

having very wide boiling points.

Question 5

Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when

Answer 5

vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law.

Question 6

Leaching of coarse solid lumps is also termed as

Answer 6

percolation

Question 7

Large scale usage of flash distillation is practiced in

Answer 7

petroleum refining

Question 8

In an operating distillation column, the

Answer 8

driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column.

Question 9

In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapor, because

Answer 9

mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition.

Question 10

For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be

Answer 10

1

Question 11

A unit operation in which a soluble component is removed from
an inert solid by a solvent which preferentially dissolves the
soluble matter is known as

Answer 11

leaching

Question 12

The unit operation by which soluble components of a liquid
mixture are dissolved in a liquid immiscible with the insoluble
component is

Answer 12

solvent extraction

Question 13

Tea percolation employs

Answer 13

leaching

Question 14

Which of the following is the most commonly used leaching
solvent in vegetable oil industry?

Answer 14

hexane

Question 15

Leaching of sugar from sugar beets is done using

Answer 15

water

Question 16

In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Answer 16

decreases

Question 17

Bollman extractor

Answer 17

is used for extraction of oil from oilseed.

fig 18-85

Question 18

Radioactive nuclear waste is treated in

Answer 18

pulsed column extractor

Table 15-13

Question 19

Acetic acid will be most economically separated from a dilute solution of acetic acid in water by

Answer 19

solvent extraction

Question 20

Liquid-liquid extraction is based on the differences in

Answer 20

solubility

Question 21

A solution of solute (A) in diluent (B) is mixed with solvent (S). The component (B) is slightly soluble in (S). The resulting extract will be

Answer 21

rich in S, poor in B, rich in A

Question 22

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

Answer 22

its recovery cost by distillation may be prohibitively high.

Question 23

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

Answer 23

extracting solvent is cheaply & abundantly available.

Question 24

In a counter-current liquid extractor

Answer 24

only one of the liquids may be pumped at any desired rate.

fig 15-52

Question 25

coalescer in a mixer-settler liquid-liquid extraction column

Answer 25

• comprises of thin bed of substances of extended surface having high porosity.
• helps in increasing the bubble size entering the settler.
• helps in increasing the settling rate of the bubbles.

Question 26

Antibiotics are best handled in a

Answer 26

Podbielniak extractor

P 20-78

Question 27

Boiling point diagram is

Answer 27

affected by pressure

Question 28

The ease of difficulty of separating components by distillation is determined by the

Answer 28

relative volatility

Question 29

Strictly speaking, the relative volatility of most ideal binary solution is

Answer 29

greatly affected by temperature

Question 30

When the relative volatility of two miscible components is close to
1.00, the components can be separated by

Answer 30

extractive distillation

Question 31

The physical separation of components in a miscible mixture by
simultaneous evaporation and condensation is

Answer 31

distillation

Question 32

In a batch distillation, the boiling point of the distillate product
compared to the residue is

Answer 32

lower

Question 33

Increasing the operating pressure of a distilling column

Answer 33

makes separation difficult

Question 34

One mole feed of a binary mixture of a given composition is flash vaporized at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect

Answer 34

the fraction vaporized but not the product composition.