The steam generated in the heating chamber contains a large amount of liquid foam, which can be separated from the steam through self condensation or the action of a defoamer when it reaches a larger evaporation chamber. Usually, the defoamer is located at the top of the evaporation chamber. Boiling evaporation: Heating a solution to its boiling point to evaporate in a boiling state. The evaporation operations in industry are basically of this type.