Fractional Crystallization

About Crystallization

Crystallization is one of the most powerful purification methods available.

Multicomponent mixtures exhibit very similar vapor pressures
Temperature sensitive products
Ultra high purities

General characteristics of crystallization:

High purities
High selectivities due to the regularity of the crystal lattice
Solid-liquid phase equilibrium
No solids handling
Low labor costs
Environmentally friendly
Separation of mixtures forming azeotropes
Replacement of traditional chemical separation methods
Low energy consumption

Crystallization technologies

Sulzer Chemtech has the following crystallization technologies available: Static melt crystallization, Falling film crystallization, Heat pump technology
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Chemicals purified by crystallization

Crystallization can be used to purify many other chemicals.
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Examples of crystallization plants

Plants from a few kg per day up to thousands of tons per year.
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Our laboratory – your benefits

Mobile pilot plant

As only limited data are available in literature, tests are a prerequisite for a reliable plant design.
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Development of Processes to Purify 2,6-Dimethylnaphthalene

Y. Viswanath and S. J. Pietsch
BP Amoco Corporation
Naperville, Illinois, USA

and

R. Stadler
Sulzer Chemtech Ltd
Buchs, Switzerland

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