Crystallization

Question 1

process whereby a solution becomes super saturated so as to cause the formation of crystals.

Answer 1

Crystallization

Question 2

Supersaturation by cooling

Answer 2

Swenson-Walker Crystallizer

Question 3

Supersaturation by evaporation of solvent

Answer 3

Salting-out” Evaporator, Oslo
Crystallizer

Question 4

Adiabatic evaporation with cooling

Answer 4

Vacuum Crystallizer

Question 5

Adding a third component where the solubility of the solute is simply reduced;

Answer 5

by seeding

Question 6

Addition of a third component to form __________

Answer 6

precipitates

Question 7

Methods of Supersaturating a Solution

Answer 7

1. Supersaturation by cooling– Swenson-Walker Crystallizer
2. Supersaturation by evaporation of solvent Salting-out” Evaporator, Oslo
   Crystallizer
3. Adiabatic evaporation with cooling - Vacuum Crystallizer
4. Adding a third component where the solubility of the solute is simply reduced;
   by seeding
5. Addition of a third component to form precipitates

Question 8

In tie substance method, the tie substance if anhydrous is

Answer 8

water

Question 9

In tie substance method, the tie substance if hydrates is

Answer 9

free or excess water

Question 10

heat balance in crystallizer consists of

Answer 10

specific heat, heat of solution and heat of crystallization

Question 11

Mechanism of crystallization by seeding

Answer 11

1. nucleation
2. crystal growth

Question 12

Mechanism of crystallizations

Answer 12

(a) Nucleation and (b) Crystal Growth

Question 13

Assumptions in the use of seed crystals

Answer 13

a. no new nucleation Occurs
b. uniform linear growth, i.e., the △L or △D law applies

Question 14

the rate of linear growth is independent of size

Answer 14

△L or △D law