Evaporation is a unit operation that uses heating to heat a solution containing a non-volatile solute to a boiling state, so that part of the solvent is vaporized and removed, thereby increasing the concentration of the solute in the solvent. The application of evaporation operation in industrial production has the following occasions:

1.Concentrate the dilute solution to directly prepare the product or reprocess the concentrated solution (such as cooling and crystallization) to prepare the solid product, such as the concentration of electrolytic caustic soda, the concentration of aqueous sugar solutions, and the concentration of various fruit juices. 

2.At the same time a concentrated solution and recovering the solvent, for example, organophosphorus pesticides concentrated solution of benzene from benzene and evaporated Chinese leachate production of alcohol and the like. 3 . In order to obtain pure solvent such as desalination. Rising film evaporator In short, the evaporation operation is widely used in the chemical industry, food industry, pharmaceutical industry and other industries.

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