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Film Evaporation

Date: 2020-04-23 Views: 257

Film Evaporation

The liquid to be concentrated is supplied to the top of the heating tubes and distributed in such a way as to flow down the inside of the tube walls as a thin film.  The liquid film starts to boil due to the external heating of the tubes and is partially evaporated as a result. The downward flow, caused initially by gravity, is enhanced by the parallel, downward flow of the vapor formed.  Residual film liquid and vapor is separated in the lower part of the calandria and in the downstream centrifugal droplet separator. it is essential that the entire film heating surface, especially in the lower regions, be evenly and sufficiently wetted with liquid.  Where this is not the case, dry spots will result that will lead to incrustation and the build-up of deposits.

This separator is not required in counter-current applications (stripping) or when the falling film evaporator is used as a reboiler of a distillation column.


Typical Reference product

Ruihao’s falling film evaporators are widely used in the organic chemical industry, as column reboilers in (high) vacuum distillation systems.


Other typical applications are:

• Product purification

• Solvent recovery

• Concentration of solutions and slurries

• Drying

• Treatment of industrial waste streams

• Amino acids

• Sugars

• Thioglycols

• Esters

• Fatty acids and derivatives

• Active Pharmaceutical Ingredients

• Vitamin E

• Resins

• Caprolactam