Suspension crystallization

Suspension crystallization hits high purity in one step

Besides static and falling film, suspension crystallization is an industrially used melt crystallization technology. The specific advantages of this technology include a compact layout, high purity in one step, low energy consumption, and low installation costs.

Suspension crystallization plant
Main benefits
  • Compact layout
  • High purity in one step
  • Low energy consumption
  • Low installation costs
Main applications
  • Organic and inorganic chemicals at high purities
  • Monomers
  • Carboxylic acids
  • Aromatic isomers


The advantages of suspension crystallization must be balanced against a higher mechanical complexity when compared with the layertechnologies.

The process can be divided in two blocks:

  • Crystallization: production of the crystals
    This block consists of at least one scraped surface crystallizer for removal of the crystallization heat, and a growth vessel where the produced crystals have time to grow to a separable size. 
  • Separation: separation of the crystals from the mother liquor
    This block consists of at least one wash column with peripherals such as a melt loop with a heat exchanger to melt the crystals.

For certain applications, delivery of a skid-mounted unit may be an option.

Process flow diagram
Process flow diagram
Process flow diagram

Technical articles

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