Innovative Process Solutions

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Crystallization

The LIST continuous crystallization process combines the processes of evaporation, crystallization and drying in one single-shaft LIST KneaderReactor under vaccum. In the mixing chamber, the solvent in the feed product undergoes flash evaporation. As the solution becomes super-saturated, the product is crystallizing. The amount of evaporation duty and crystallization heat level out such that no major heat transfer is required.

After the evaporation stage, the crystals are still wet, sticky and capable of forming large agglomerates. The design of the LIST KneaderReactor provides effective drying with minimal product buildup and crust formation without the need to recycle dry product.

The feed solution is incooperated into a solid particle bed which seeds the crystallization and limits the mechanical power and shaft torque.

Throughout the process, the large heat exchange surfaces ensure precise temperature control.

Example

Polyols, Sugar alcohols
Sugar alcohols or Polyols, are produced through hydrogenation of monosaccharide or disaccharide solutions.
Sugar alcohols are largely used in the food industry principally because of their low physiological caloric values. Sugar alcohols are also well known as a bulking agent for sweeteners. They are added in prescribed quantities for the regulation of the specific sweetness of a product. The specific properties of several sugar alcohols allow the replacement of sugar and glucose syrup in all food categories.

Paint additives
Crystallization and removal of methanol

Your Benefits

  • Effective self-cleaning to minimize dead zones, product accumulation and product degradation
  • Excellent kneading and mixing for better homogenization
  • High surface renewal efficiency
  • Low shear processing
  • Narrow residence time distribution combined with a wide and flexible range of residence times