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Cooling crystallization

Principle

By cooling the solution, the solubility of the salt is reduced and salt is crystallized.

Process description

Cooling crystallization is mainly used for salts with a decreasing solubility at decreasing temperature. An almost saturated solution enters the crystallizer K or its circulation line. Here, it mixes with the circulated solution and is only slightly cooled in the cooler WT, so that spontaneous germ formation and encrustation of the tubes is minimized. In the crystallizer K, supersaturation is then reduced by crystal growth. From there, the suspension is pumped to the cyclone ZY with the suspension pump SP for thickening. The liquid is then separated in the centrifuge Z. The salt is dried in dryer T.

Characteristics

  • Suitable for solutions with a high boiling point increase which cannot be sufficiently cooled by flash cooling.
  • The system can be operated at atmospheric pressure.
  • Flexible partial load operation is possible.
  • Suitable for various applications.

Variants

  • With or without salt separation.
  • With several circulation circuits for critical salts for operation during cleaning.
  • Designed for continuous or discontinuous operation.
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