Crystallization is a process where a solid forms from a liquid solution as atoms or molecules organize into a crystal structure. Crystals can form through precipitation, freezing, or deposition from a gas. The attributes of the resulting crystal depend on factors like temperature, pressure, and fluid evaporation time. Crystallization separates solutes from a solution by forming solid particles. It involves mass transfer from the liquid phase to the crystal surface. Continuous crystallizers like the Swenson-Walker crystallizer operate on a cooling and super saturation principle to continuously form crystals of uniform size and free of inclusions from the liquid feed.

1. CRYSTALLIZATION
INDUSTRIAL CHEMICAL PROCESS
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2. CRYSTALLIZATION
 Crystallization is the (natural or artificial)
process by which a solid forms, where the
atoms or molecules are highly organized into
a structure known as a crystal.
 Some of the ways by which crystals form
are precipitating from a solution, freezing, or
more rarely deposition directly from a gas.
 Attributes of the resulting crystal depend
largely on factors such as temperature, air
pressure, and in the case of liquid crystals,
time of fluid evaporation.
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3. Contd,..
 Crystallization is an operation in which solid
particles are formed from a liquid solution.
 It is a solid liquid operation used to seperates
solutes from solution in the form of crystals.
 In this operation mass tranferred from the
liquid phase to the solid phase/the crystal
surface
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4. CLASSIFICATION OF
CRYSTALLIZER
It is based on the mode of operation
 Batch crystallizer: stir tank crystallizer
 Continuous crystallizer :swenson walker
crystallizer
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5. Swenson-walker crystallizer
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6. INTRODUCTION
 Swenson-walker crystallizer is a continuous
type crystallizer.
 This operation involves both heat and mass
transfer.
 Crystallization is the formation of solid
particles with in homogeneous phase.
 In the formation of crystals two steps are
required.
Nucleation(birth of new solute particle)
crystal growth(growth of the nucleus to
microscopic size )6

7. PRINCIPLE
 It works on the principle based on super
saturation by cooling.
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8. CONSTRUCTION
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9. OPERATION
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10. ADVANTAGES AND
DISADVANTAGES
 Less floor space is required
 Saving labor cost
 Continuous process
 Crystal of uniform size, free from inclusions
 Scrapper may break crystal to the little extent
due to the agitation
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11. Thank
you!!11