PURPOSE: To prevent the corrosion of a distillation vessel and condenser and to enhance the recovery rate of a solvent by suppressing the deterioration and emulsification of the solvent in the distillation vessel of the solvent of a dry cleaning machine.

CONSTITUTION: A solvent purifying vessel 10 is provided with an air introducing port 23 which is connected to a route 14 in an air circulating path A. The port is connected to the route 14 through a branch path 13 from a discharge port 12. A part or the whole of the heating air flows into the solvent purifying vessel 10 and comes into contact with the solvent in a drying stage where the solvent evaporates and impurities are separated. The temp. of the solvent is held at ordinary temp. and there is no need for a distiller.