Crystallization and its process.

1. Prepared
By
Md. Suzauddula
Dept of NFE
Daffodil International University

2. The method was developed
in 1916.
Jan Czochralski brought the
method.
Crystallization is the (natural or artificial) process where a solid
forms where the atoms or molecules are highly organized in a
structure known as a crystal. Some of the ways which crystals
form are through precipitating from a solution, melt or more rarely
deposited directly from a gas.

3. A crystal or crystalline solid is
a solid material whose constituents, such
as atoms, molecules or ions, are arranged
in an highly ordered microscopic structure,
forming a crystal lattice that extends in all
directions.
Most mineral crystals grow from molten rock
deep within the Earth. As a magma cools,
many crystals form simultaneously and
crowd into one another, producing irregular
shapes. In this rock slab, quartz and feldspar
crystallized to form the speckled granite.

4. Some of the important factors influencing solubility are:
Concentration
Temperature
Polarity
Ionic Strength
Now we may identify some main families of crystallization
processes:
Cooling crystallization
Evaporative crystallization
DTB Crystallization

5. Most chemical compounds, dissolved in most solvents, so-
called direct solubility that is the solubility threshold increases
with temperature. Solubility of the system Na2SO4 – H2O. So,
whenever the conditions are favorable, crystal formation results
from simply cooling the solution.
Water Solutio
n
CrystalIce

6. Most industrial crystallizers are of the evaporative type, such
as the very large sodium chloride and sucrose units, whose
production accounts for more than 50% of the total world
production of crystals. The most common type is the forced
circulation (FC) model (see evaporator). A pumping device
(a pump or an axial flow mixer) keeps the crystal slurry in
homogeneous suspension throughout the tank, including the
exchange surfaces; by controlling pump flow, control of the
contact time of the crystal mass with the supersaturated
solution is achieved, together with reasonable velocities at the
exchange surfaces.

7. Advantages of the Swenson DTB Crystallizer:
1. Can produc large singular crystals.
2. Lower operating costs.
3. Minimum space requirements.
4. Can be controlled easily.
5. Simplicity of operation, start-up and shutdown.
6. The product size varies only slightly with large changes in
production.
Associated Products
Ammonium Sulfate
Magnesium Sulfate
Potassium Chloride

8. Salt
Sugar and its dalivatibes
Drags/medicine
Ice
Ice cream
Baby Foods
And storing process

9. 1) Cane receiving and unloading
2) Cane preparation
3) Juice extraction
4) Juice clarification
5) Juice evaporation
6) Crystallization
7) Separation of the sugar crystals from the mother liquor,
most done by centrifugal machines
8) Sugar drying, Packaging and delivery

10. Salt and
Water
solution
Boild
at 100
c
Salt
801 C