ORGANIC SOLVENT RECOVERING METHOD AND APPARATUS

摘要

PURPOSE:To recover an organic solvent at high recovery efficiency by spraying a waste organic solvent to the inside of a sealed container in heated atmosphere, supplying vapor of a heat medium having boiling point higher than that of an organic solvent in a waste organic solvent or than the azeotropic point of them, and comdensing the vapor of the organic solvent evaporated by the contact outside the container. CONSTITUTION:While a waste organic solvent being supplied in vapor state to a sealed container 21 in heated atmosphere from a supplying pipe 51 by a nozzle 61, vapor of a heat medium (e.g. steam) having a boiling point higher than that of an organic solvent (e. g. acetone) in the waste organic solvent or than the azeotropic point of them is supplied from a supplying pipe 52 by a nozzle 61 and both are brought into contact with each other. The vapor of the organic solvent in the waste organic solvent which is evaporated at once by the heat exchange is introduced into a condensing apparatus 4 through a gas discharging outlet 11 and a valve 31 and there the vapor is condensed. The supplied steam is condensed and converted into dewdrops instantly by the heat exchange and drops fall due to self-weight. As a result, recovery ratio of the organic solvent becomes high and throublesome cleaning work for reuse of the container 21 becomes unnecessary.