1. Concentrate the dilute solution to prepare the product directly or re-treat the concentrated solution (such as cooling and crystallization) to obtain a solid product, such as concentration of electrolytic caustic soda, concentration of aqueous sugar solution, concentration of various juices, etc.
2. At the same time, the solution is concentrated and the solvent is recovered, for example, concentrated benzene extraction of the organophosphorus pesticide benzene solution, evaporation of the alcohol leaching solution in the production of the traditional Chinese medicine, etc.
3. In order to obtain a pure solvent, such as seawater desalination.
In short, in the chemical industry, food industry, pharmaceutical and other industries, evaporation operations are widely used.