Distillation apparatus

Abstract

Spiral double-pipe structure (51) including internal pipe (52) for introduction of a solvent vapor resulting from vaporization within distillation kettle (41) and external pipe (53) for flow of a refrigerant gas cooled by outdoor machine (55) is disposed in buffer tank (50). The solvent vapor is directly cooled from the surround by the refrigerant gas with large temperature difference and thus condensed into a liquid. By means of ejector (66), the liquid is mixed with the solvent suctioned from the buffer tank (50) and returned into the buffer tank (50). As the solvent within the buffer tank (50) is also directly cooled by the refrigerant gas, there can be attained a high cooling efficiency. Accordingly, not only the solvent vapor generated from the distillation kettle (41) but also the solvent within the buffer tank (50) for pressure reduction of the interior of the distillation kettle (41) can be efficiently cooled without the use of cooling water, and downsizing of the apparatus can be attained.

Description

technical field [0001] The present invention relates to a distillation apparatus for purifying, for example, solvents used in dry cleaning machines and solvents used for cleaning various electronic components. Background technique [0002] In dry cleaning machines used in laundromats, etc., in order to repeatedly use solvents (silicone oil, petroleum solvents, etc.) contaminated by cleaning laundry, a vacuum distillation device for purifying solvents is generally used. Conventionally, as a method of condensing solvent vapor in such a distillation apparatus, generally, a spiral-shaped or other pipe with an increased surface area is provided in a container filled with solvent vapor, and water cooled in a cooler or a cooling tower flows through the pipe. , a method of condensing (for example, refer to Patent Document 1, etc.). In contrast, there is also a method in which a spiral pipe is arranged in a container filled with cold water, and a solvent vapor is heat-exchanged in t...

AI Technical Summary

Problems solved by technology

However, the temperature of the solvent in the buffer tank is higher than the temperature of the cooling water, and it is difficult to ensure a sufficient temperature difference between the solvent and the solvent vapor. Therefore, there is a problem that the cooling of the solvent vapor is insufficient, making it difficult to perform condensation and liquefaction properly.

Furthermore, since it is necessary to increase the heat capacity of the solvent in the buffer tank, there is also the problem that a large-volume buffer tank must be installed.

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