EVAPORATION

Question 1

The process of removing solvent from a solution by boiling the liquid in a vessel and withdrawing the vapor leaving a concentrated pdt is

Answer 1

Evaporation

Question 2

Drying involves the removal of water from a. ..

Answer 2

Solud

Question 3

Evaporation is the removal of water in a

Answer 3

Solution

Question 4

Drying involves removal of water at temperature….

Answer 4

Below the boiling point

Question 5

Evaporation means removal of water at … temperature

Answer 5

At a boiling point

Question 6

Evaporator are classified into three namely

Answer 6

Simple evaporator
Forced circulation evaporator
Multiple effect evaporator

Question 7

Climbing film evaporator
Horizontal evaporator are under which class of evaporator

Answer 7

Forced circulation evaporator

Question 8

Evaporating pan
Evaporating still and short tube evaporators are under … evaporator

Answer 8

Simple evaporator

Question 9

Three processes that transfer in evaporator are

Answer 9

Conduction
Radiation and
Convection

Question 10

Evaporation can be affected by

Answer 10

Temp.
Time of evaporation
Moisture content
Concentration
S.A
Vapour pressure
Type of pdt required

Question 11

Evaporating pan cannot be used for a … material

Answer 11

Thermolabile

Question 12

Cheap to construct
Easy to clean and use
Easy stirring of the evaporating liquid can be done easily by … evaporator

Answer 12

Evaporating pan

Question 13

… evaporator is easy to clean and use

Answer 13

Evaporating pan

Question 14

… evaporator is easy to clean and maintain

Answer 14

Evaporating still

Question 15

Evaporating still can use solvent other than water.T/F

Answer 15

True

Question 16

Disadvantages of evaporating still is

Answer 16

Liquor is heated all the time
Heating surface is limited

Question 17

Short tube evaporators is also known as…

Answer 17

Tube evaporators

Question 18

Tube evaporators consist of 1-2m of tube and assemblage of tube is called …

Answer 18

Calendria

Question 19

It can be used to concentrate extracts with different solvent.
Evaporators are limited to hormones, antibodies and enzyme
It is an advantage of… evaporator

Answer 19

Multiple effect evaporator

Question 20

… evaporator have a different solvent of different b.p

Answer 20

Multiple effect

Question 21

Two multiple effect evaporator are connected together with… arrangements

Answer 21

Piping