To provide an evaporation method of a foamable solution capable sufficiently suppressing both of thermal foaming and mechanical foaming, with a high treatment efficiency of the foamable solution per unit volume of an evaporator.
This evaporation method of the foamable solution uses the evaporator having a foamable solution introducing port and a vapor taking-out port at the upper part of the evaporator. The superheated foamable solution is introduced into the evaporator from the introducing port, formed into a vapor-liquid mixture and jetted to a coolable wall face of the vapor phase of the evaporator, allowed to flow down on the wall face, and cooled below a boiling point at an operation pressure until reaching a liquid sump part of the evaporator.
FUKUDA KOICHI
MORISHITA MITSUGI
