JP2007203179A - Filtration and distillation apparatus, filter for use therein, dry cleaning apparatus and refining method of organic solvent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filtration and distillation apparatus improved so as to enhance the washing efficiency of clothing. <P>SOLUTION: The filtration and distillation apparatus is equipped with a filter device 2. The filter built in the filter device 2 has a cylindrical wall having a hollow part formed therein. A clean organic solvent is taken out of the follow part of the cylindrical wall by the filtering action of the cylindrical wall by passing the organic solvent containing an adherend from the surface of the cylindrical wall toward the hollow part thereof. The sludge adhered to the surface of the filter is filtered out in the organic solvent stagnated on the outside of the filter by axially rotating the filter by a motor 19. The organic solvent containing sludge is naturally dropped in a storage container 14 and separated into an organic solvent 20b with high specific gravity much containing the sludge and an organic solvent 20a with low specific gravity. The organic solvent 20a with low specific gravity is filtered to be directly returned to a base tank 3 and the organic solvent 20b with high specific gravity much containing the sludge is distilled and refined to be returned to the base tank 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention generally relates to a filtration distillation apparatus, and more particularly, to a filtration distillation apparatus improved so as to efficiently purify an organic solvent. The present invention also relates to an improved filter used in such a filtration distillation apparatus so as to extend its life. The invention also relates to a dry cleaning apparatus fitted with such a filtration distillation apparatus. The present invention also relates to a method for purifying an organic solvent capable of efficiently purifying an organic solvent for dry cleaning.

  Most cleaning stores dry clean clothes that shrink or fade when washed with water in order to wash them safely. Dry cleaning is a method of washing clothes using an organic solvent. A commonly used organic solvent is dry sol.

  FIG. 4 is a conceptual diagram of a conventional dry cleaning apparatus. A conventional dry cleaning apparatus includes a washing tank 1 for washing clothes with an organic solvent, a filter apparatus 2 for filtering the organic solvent, and a base tank 3 for storing the organic solvent. The cleaning tank 1 and the filter device 2 are housed in the outer frame 12. The organic solvent is sent from the base tank 3 to the filter device 2 by the pump P, filtered, sent to the washing tank 1 and used for washing clothes. The organic solvent circulates between them. The filter device 2 serves to remove sludge (dirt and other dirt components) in the organic solvent and prevent the sludge from reattaching to the clothing in the cleaning tank 1.

  FIG. 5A is a conceptual perspective view of a conventional filter device 2. The filter device 2 includes an outer container 4 and a cartridge-type hollow filter 6 having a hollow portion 5 loaded in the outer container 4. A filter support shaft 7 that supports the filter 6 is inserted into the hollow portion 5.

  FIG. 5B is a cross-sectional view taken along line BB in FIG. Referring to FIG. 5 (B), the outermost layer of filter 6 is composed of non-woven fabric 31, and its inner surface is covered with mesh mesh 32, and further, the inner surface is a hardware 33 having punch holes for protecting mesh mesh 32. A granular carbon layer 34 is provided on the inside thereof, and a mesh net 35 is covered on the inside thereof, and further, an inner side thereof is covered with a metal piece 36 having a thickness of about 3 mm and having punch holes.

  FIG. 6 is a diagram for explaining the operation of the filter 6 and is represented by a cross-sectional view corresponding to FIG. 5B. However, in order to simplify the drawing, the hatching of the filter 6 is simplified. . With reference to FIG. 6A, the filter 6 has a cylindrical shape having a hollow portion 5. The organic solvent 8 that has been used for washing clothes and has been contaminated is filtered through the wall member of the filter 6 as indicated by an arrow and travels toward the hollow portion 5. At this time, referring to FIG. 6 (B), sludge (dirt and other dirt components) 9 and the like are removed, clean organic solvent 10 is taken out from hollow portion 5, and referring to FIG. 4 again, the washing tank 1 is sent.

  Since the conventional dry cleaning apparatus is configured as described above, when the liquid is rotated 500 to 600 times and washed (referred to as a 500 to 600 washer), referring to FIG. The sludge 9 accumulates and the accumulated sludge 9 clogs the filter 6. Therefore, in the conventional apparatus, it is necessary to replace the filter 6 with a new one with 500 to 600 washers. However, the filter 6 is expensive, and discarding it with only 500 to 600 washers was a large loss economically.

  As a second conventional example, a dry cleaning apparatus shown in FIG. 7 is also used. The same parts as those shown in FIG. 4 are denoted by the same reference numerals, and the description thereof will not be repeated. This conventional apparatus includes a distiller 11 that takes out a part of the contaminated organic solvent from the base tank 3 and distills and purifies it. The organic solvent purified by the distiller 11 is returned to the base tank 3 and circulates through the filter 2 and the cleaning tank 1.

  In the second conventional example, since the distiller 11 is provided, the degree of clogging of the filter 6 is reduced by the amount of dirt components removed by the distiller 11. However, in the method in which only a part of the dirty organic solvent is removed from the base tank 3 and purified, the capacity of the base tank 3 is 400 L, for example, and the capacity of the distiller 11 is 80 L, for example. Most of them remain in the base tank 3 without being purified, and circulate through the filter 2 and the washing tank 1. Therefore, the filter life is short even in the second conventional example. In addition, since the sludge cannot be removed sufficiently, there is a problem that the washing efficiency of the clothes is poor.

  The present invention has been made to solve such problems, and an object thereof is to provide an improved filtration distillation apparatus so that sludge can be sufficiently removed.

  Another object of the present invention is to provide a filter distillation apparatus improved so that the filter can last longer.

  Still another object of the present invention is to provide an improved filter so that it can last longer.

  Still another object of the present invention is to provide an improved dry cleaning apparatus so that the washing efficiency of clothes can be increased.

  Another object of the present invention is to provide a method for purifying an organic solvent that can efficiently purify the organic solvent.

  The filtration distillation apparatus according to the present invention is a filtration distillation apparatus for filtering and distilling an organic solvent that is sent from a base tank to a washing tank and dry-cleans clothing. The apparatus has a cylindrical wall in which a hollow portion is formed, and an organic solvent containing deposits is allowed to pass through the cylindrical wall from the surface toward the hollow portion. A filter that removes a clean organic solvent from the hollow portion by filtration and the shaft of the filter are rotated to remove the deposits adhering to the surface of the filter into the organic solvent that is retained outside the filter. Filter rotating means. A storage container is provided below the filter for receiving and temporarily storing the organic solvent containing the deposits that have fallen off and fall naturally. The storage container is provided with separation means for separating and discharging the upper organic solvent and the lower organic solvent in the storage container. The apparatus further comprises a distiller for distilling the separated lower organic solvent.

  According to the filtration distillation apparatus according to the present invention, the filter distillation means for removing the adhering matter adhering to the surface of the filter in the organic solvent staying outside the filter is provided, so that the filter is regenerated many times. be able to. In addition, organic solvents containing a large amount of sludge have a high specific gravity, and since they are collected in the lower part of the storage container, they are selectively taken out and distilled, so that only the purified organic solvent can be used for the base tank and filter device. Circulate. As a result, the lifetime of the filter is also extended.

  According to a preferred embodiment of the present invention, the filter rotating means is inserted into the hollow portion of the filter, supports the filter, and rotates the filter while rotating the filter. A motor to be rotated, a protrusion provided on the surface of the filter spindle, and an inner surface of the hollow portion of the filter, and the protrusion engages with the rotation of the filter spindle. And a receiving member for rotating the shaft.

  As the filter rotates, the deposits attached to the surface of the filter are removed.

  According to a further preferred embodiment of the present invention, the separation means has one end connected to the lower part of the storage container and the other end connected to the distiller, and further opens and closes the pipeline. A distiller-side pipe line having a valve, one end of which is connected to the boundary between the upper part and the lower part of the reservoir, and the other end is connected to the base tank, and the pipe is opened and closed. And a base tank side conduit having an open / close valve for performing the above.

  By comprising in this way, it can isolate | separate into the organic solvent with a heavy specific gravity which contains many sludges, and the organic solvent with a low specific gravity which does not contain much sludge, and can discharge | emit from a storage container separately, respectively.

  The base tank side conduit is connected to the reservoir by selecting a position so that the upper portion and the lower portion of the reservoir are 1: 3 to 3: 1 in the volume ratio of the organic solvent to be stored. It is preferable. By selecting the position in this manner, an organic solvent having a high specific gravity can be selectively and efficiently separated.

  It is preferable that a filter member for filtering the organic solvent in the upper part and sending it to the base tank is provided in the upper part of the reservoir. The organic solvent with low specific gravity in the upper part is not sent to the distiller, but it does not contain much sludge from the beginning, and the filter member removes large dust etc., so the clean organic solvent is sent to the base tank. It will be.

  The distiller side pipe line is arranged so that the organic solvent naturally falls from the storage container to the distiller, and the base tank side pipe line has the organic solvent from the storage container to the base tank. Arranged to fall naturally. If comprised in this way, an organic solvent can be moved without using motive power, and it becomes economically advantageous.

  The storage container is preferably provided with a window for observing the internal state from the outside. If the inside of the storage container can be observed from the window, the position of the liquid surface of the organic solvent in the storage container can be confirmed.

  The lower part of the reservoir is preferably tapered in a downward direction. By tapering the lower part, all the organic solvent in the lower part can be fed into the distiller without leaving the organic solvent.

  A filter according to another aspect of the present invention has a cylindrical wall in which a hollow portion is formed, and allows the organic solvent containing deposits to pass through the cylindrical wall from the surface toward the hollow portion. As a result, the filter takes out a clean organic solvent from the hollow portion by the filtering action of the wall. And the protrusion part provided in the surface of the filter spindle inserted in the said hollow part engages with the inner surface of the hollow part of the said filter, and this filter is axially rotated with rotation of the said filter spindle. A receiving member is provided.

  As the filter rotates, sludge accumulated on the surface of the filter is wiped off into the organic solvent remaining on the surface of the filter by centrifugal force or the like.

  A dry cleaning apparatus according to still another aspect of the present invention includes a base tank for storing an organic solvent, a washing tank for washing clothes with the organic solvent, and filtering and purifying the organic solvent to return to the base tank. And a filtration distillation means. The filtration distillation means has a cylindrical wall in which a hollow portion is formed, and passes the organic wall containing deposits from the surface of the cylindrical wall toward the hollow portion. A filter that removes a clean organic solvent from the hollow portion by the filtering action of the wall, and the shaft of the filter is rotated, and the adhering matter adhering to the surface of the filter is accumulated in the organic solvent staying outside the filter. Filter rotating means for removing, a storage container that is provided at the lower part of the filter and receives the organic solvent containing the deposited matter that has fallen off, and temporarily stores, and provided in the storage container And a separating means for separating and discharging the upper organic solvent and the lower organic solvent, and a distiller for distilling the separated lower organic solvent.

  The method according to still another aspect of the present invention relates to a method for purifying an organic solvent that is stored in a base tank and supplied to a washing tank to wash clothes. First, the organic solvent after washing is divided into two parts having a high specific gravity and a part having a low specific gravity. A portion having a high specific gravity is selectively removed, purified by distillation, and returned to the base tank. The part with a low specific gravity is returned directly to the base tank.

  According to this invention, since the organic solvent containing a large amount of sludge has a high specific gravity, it accumulates in the lower part of the storage container, and this is selectively taken out and distilled. On the other hand, an organic solvent having a light specific gravity that does not require distillation and does not contain sludge is directly returned to the base tank without being distilled. Therefore, the purification efficiency of the organic solvent is improved.

  According to a preferred embodiment of the present invention, the portion having a low specific gravity is filtered before being returned to the base tank.

  Although the organic solvent in the upper part is not sent to the distiller, large dust or the like is removed by the filtering member, and a clean organic solvent is sent to the base tank.

  A filtration distillation apparatus according to another aspect of the present invention is a filtration distillation apparatus for filtering and distilling an organic solvent that is sent from a base tank to a washing tank and dry-cleans clothing, and adheres to the surface of the filter. The present invention is characterized in that a sludge removing means for removing the sludge is provided.

  According to the present invention, the adhering matter adhering to the filter can be removed, so that the filter can be regenerated many times. In addition, organic solvents containing a large amount of sludge have a high specific gravity, and since the organic solvent containing a large amount of sludge is selectively taken out and distilled using the fact that it accumulates in the lower part of the storage container, the purification efficiency is improved. Well-purified organic solvent circulates in the base tank, filter device and cleaning tank. As a result, the life of the filter is extended and the cleaning effect of the clothes is enhanced.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a conceptual diagram of a dry cleaning apparatus according to an embodiment of the present invention. The same parts as those in the prior art shown in FIG. 4 are denoted by the same reference numerals, and the description thereof will not be repeated. Referring to FIG. 1, a filtration distillation apparatus 13 according to the present invention filters and distills an organic solvent that is sent from a base tank 3 to a washing tank 1 to dry clean clothes, and includes a filter 6. The filter device 2, the storage container 14, and the distiller 15 are provided. As will be described later, the filter support shaft 16 is rotated by a motor 19.

  2A is a conceptual perspective view of the filter device 2, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 2A. Referring to these drawings, the filter device 2 has a cylindrical wall in which a hollow portion 5 is formed, and the cylindrical wall is directed from the surface toward the hollow portion 5 as indicated by an arrow. The filter 6 is provided to take out a clean organic solvent from the hollow portion 5 by allowing the organic solvent containing sludge to pass through and filtering the wall.

  As will be described later, the filter 6 can be swung off the sludge adhering to the surface thereof into the organic solvent staying outside the filter 6 by rotating the shaft. As shown in FIG. 2B, a filter support shaft 16 that supports the filter 6 and rotates the filter 6 is inserted into the hollow portion 5 of the filter 6. A protrusion 17 is provided on the surface of the filter support shaft 16. Projections 17 provided on the surface of the filter support shaft 16 are engaged with the inner surface of the filter 6 facing the hollow portion 5, and the filter 6 is rotated axially as the filter support shaft 16 rotates. A receiving member 28 made of a hardware having punch holes is provided. A cross-sectional view of the filter 6 is as shown in FIG. 5B except that the protrusion 17 and the receiving member 28 are provided on the surface of the filter support shaft 16. The receiving member 28 is fixed to the inner surface of the filter 6 by, for example, welding. When the projection 17 on the surface of the filter support shaft 16 is engaged with the receiving member 28 provided on the inner surface of the filter 6, the filter support shaft 16 is rotated by a motor 19 as shown in FIG. The filter 6 rotates.

  As another embodiment of the filter, as shown in FIG. 2C, receiving members 28 may be provided at four locations on the peripheral surface in order to increase the strength. If comprised in this way, each of the receiving member 28 can be made small and there exists an effect that the volume of the hollow part 5 can be taken widely.

  Referring again to FIG. 1, a storage container 14 is provided below the filter device 2 to receive and temporarily store the falling organic solvent in the filter device 2 together with the sludge removed. The lower part of the storage container 14 has a tapered shape that narrows downward.

  The storage container 14 is provided with separation means for separating and discharging the organic solvent 20a located in the upper part of the storage container 14 and the organic solvent 20b located in the lower part. The separating means has one end connected to the lower part of the storage container 14 and the other end connected to the still 15, and further has a distiller side pipe line 22 having an opening / closing valve 21 for opening and closing the pipe line, One end of the storage container 14 is connected to the boundary between the upper part and the lower part, the other end is connected to the base tank 3, and the base tank side conduit having an opening / closing valve 23 for opening and closing the conduit. 24.

  The base tank side pipe line 24 selects the position so that the upper part and the lower part of the storage container 14 are 1: 3 to 3: 1 in the volume ratio of the organic solvents 20a and 20b to be stored. 14. For example, when the volume of the organic solvent accommodated in the filter device 2 is 150 L, the base tank side conduit 24 is attached at a position where the volume of the lower organic solvent 20 b is 80 L and the volume of the upper organic solvent 20 a is 70 L. It is preferable to be selected so that This is because it has been empirically confirmed that a large amount of sludge is approximately 80 L.

  A filtration member 25 for filtering the organic solvent 20a having a low specific gravity and feeding it into the base tank 3 is provided above the storage container 14.

  The distiller side pipe line 22 is arranged so that the organic solvent 20 b naturally falls from the storage container 14 to the distiller 15, and the base tank side pipe line 24 is filled with the organic solvent 20 a from the storage container 14 to the base tank 3. Arranged to fall naturally. The storage container 14 is provided with a window 26 for observing the internal state from the outside.

  Next, the operation will be described.

  Referring to FIGS. 3A and 3B, when organic solvent 8 containing sludge is repeatedly filtered through filter 6, sludge 9 is accumulated on the surface of filter 6. At this time, referring to FIGS. 3C and 1, the filter support shaft 16 is rotated by the motor 19. At this time, the protrusion 17 provided on the surface of the filter support shaft 16 is engaged with the receiving member 28 provided on the inner surface of the filter 6, and the filter 6 is axially rotated as the filter support shaft 16 rotates. Let As the filter 6 rotates, the sludge 9 adhering to the surface of the filter 6 drops off from the surface due to centrifugal force or the like, and is wiped off into the organic solvent 8.

  Referring to FIG. 1 together with the organic solvent 8 and the sludge 9 removed in the organic solvent, the pipe connecting the filter device 2 and the storage container 14 is opened by the opening / closing valve 27, so that the inside of the storage container 14 And let it fall naturally. 3D, the inside of the filter device is emptied, sludge is removed from the surface of the filter 6, and the filter 6 is regenerated.

  On the other hand, referring to FIG. 1, if the organic solvent containing sludge that naturally falls into the storage container 14 is left a little, the organic solvent 20 b having a large specific gravity containing a large amount of sludge and sludge in the storage container 14. It is divided into two layers of a light specific gravity organic solvent 20a. Since the organic solvent 20b having a large specific gravity and containing a large amount of sludge is black and turbid, the interface between the two is obvious. After confirming that they are separated from each other from the window 26, first, the opening / closing valve 23 is opened, and the organic solvent 20 a having a light specific gravity that does not contain much sludge is filtered by the filter member 25. Return to the base tank 3. The organic solvent 20a having a light specific gravity is removed from the dust and the like by the filter member 25, becomes a clean organic solvent, and is sent to the base tank 3.

  Next, it is confirmed from the window 26 that the position of the liquid surface of the organic solvent 20a having a low specific gravity has been lowered to a predetermined portion, the opening / closing valve 21 is opened, and the organic solvent 20b containing a large amount of sludge is removed from the distiller side. It is fed into the still 15 via the pipe line 22. In this way, an organic solvent having a high specific gravity can be selectively and efficiently separated. By making the lower part of the storage container 14 into a tapered shape that narrows downward, all of the liquid in the lower part can be fed into the distiller 15 without leaving any liquid.

  The organic solvent 20b having a high specific gravity is distilled by the distiller 15, sludge is removed, and the organic solvent 20b is returned to the base tank 3. Thus, sludge can be removed efficiently.

  According to the present embodiment, the organic solvent 20b containing a large amount of sludge has a high specific gravity, and the organic solvent 20b containing a large amount of sludge is selectively taken out and distilled using the fact that it accumulates in the lower part of the storage container 14. Therefore, the efficiency of the purification of the organic solvent is improved as compared with the second conventional example, and as a result, the sufficiently purified organic solvent circulates in the base tank 3, the filter device 2, and the cleaning tank 1. As a result, the life of the filter 6 is extended and the washing effect of the clothes is enhanced.

  In this embodiment, the number of protrusions 17 provided on the filter support shaft 16 is two, and the number of receiving members provided on the inner surface of the filter 6 is two or four. The number is not limited and may be one or more.

  In this embodiment, the receiving member is fixed to the inner surface of the filter. However, a recess is formed on the inner surface of the filter, and a protrusion provided on the filter support shaft is fitted into the recess, so that the filter support is fixed. As the shaft rotates, the filter may be rotated.

  In the above embodiment, as a specific example of the sludge removing means, the case where the sludge is wiped off by rotating the filter shaft is illustrated. However, the present invention is not limited to this, and the vibration applying means for applying vibration to the filter. The sludge may be removed by vibration. Moreover, a spraying means for spraying the organic solvent from the outer surface of the filter or from the outer container to the surface of the filter may be provided, and the sludge may be removed by spraying the organic solvent. Further, a backflow means for backflowing the organic solvent circulated and supplied to the filter may be provided, and sludge adhering to the surface of the filter may be removed by forcibly backflowing the organic solvent.

  Furthermore, although dry sol is exemplified as the organic solvent, other solvents such as park may be used.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  According to the dry cleaning apparatus of the present invention, the fully purified organic solvent circulates through the base tank, the filter apparatus, and the washing tank, so that the life of the filter is extended and the washing effect of clothes is enhanced.

It is a conceptual diagram of the dry cleaning apparatus which concerns on this invention. It is a conceptual diagram of the filter used for this invention. It is a figure for demonstrating operation | movement of this invention. It is a conceptual diagram of the conventional dry cleaning apparatus. It is a perspective view of the conventional filter apparatus. It is a figure which shows the problem of the conventional filter apparatus. It is a conceptual diagram of the dry cleaning apparatus concerning another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Washing tank 2 Filter apparatus 3 Base tank 4 Outer container 5 Hollow part 6 Filter 7 Filter support shaft 8 Organic solvent 9 Sludge 11 Distiller 12 Outer frame 13 Filtration distillation apparatus 14 Storage container 15 Distiller 16 Filter support shaft 17 Protrusion 19 Motor 20a Organic solvent with low specific gravity 20b Organic solvent with high specific gravity 21 Open / close valve 22 Distiller side pipe 23 Open / close valve 24 Base tank side pipe 25 Filter member 26 Window 27 Open / close valve 28 Receiving member P Pump

Claims (13)

A filtration distillation apparatus for filtering and distilling an organic solvent that is sent from a base tank to a washing tank to dry clean clothes,
By having a cylindrical wall in which a hollow portion is formed, and passing the organic solvent containing deposits from the surface of the cylindrical wall toward the hollow portion, the filtering action of the wall A filter that removes a clean organic solvent from the hollow portion;
A filter rotating means for rotating the filter axially, and removing deposits adhering to the surface of the filter in an organic solvent staying outside the filter;
A storage container that is provided at a lower part of the filter and that naturally falls, receives the organic solvent containing the deposited matter that has been wiped off, and temporarily stores the solvent;
Separation means that is provided in the storage container and separates and discharges the upper organic solvent and the lower organic solvent in the storage container;
A filtration distillation apparatus comprising a distiller for distilling the separated organic solvent in the lower part. The filter rotating means includes
A filter support shaft that is inserted into the hollow portion of the filter and supports the filter, and rotates the filter.
A motor for rotating the filter support shaft;
A protrusion provided on the surface of the filter support shaft;
2. The filtration according to claim 1, further comprising: a receiving member provided on an inner surface of the hollow portion of the filter, wherein the protrusion is engaged, and the filter is pivoted in accordance with the rotation of the filter support shaft. Distillation equipment. The separating means includes
A distiller side pipe line having one end connected to the lower part of the storage container and the other end connected to the distiller, and further having an open / close valve for opening and closing the pipe line,
A base tank side pipe having one end connected to the boundary between the upper part and the lower part of the reservoir, the other end connected to the base tank, and an open / close valve for opening and closing the pipe line The filtration distillation apparatus according to claim 1, comprising a passage.   The base tank side pipe line is connected to the reservoir by selecting a position so that the volume ratio of the organic solvent to be stored is 1: 3 to 3: 1 between the upper portion and the lower portion of the reservoir. The filtration distillation apparatus according to claim 3.   The filtration distillation of any one of Claim 1 to 4 with which the filtration member for filtering the organic solvent in this upper part and sending it into the said base tank is provided in the upper part of the said storage device. apparatus. The distiller side pipe line is arranged so that the organic solvent naturally falls from the storage container to the distiller,
The filtration distillation apparatus according to claim 3, wherein the base tank side pipe line is arranged so that the organic solvent naturally falls from the storage container to the base tank.   The filtration distillation apparatus according to any one of claims 1 to 6, wherein the storage container is provided with a window for observing an internal state from the outside.   The filtration distillation apparatus according to any one of claims 1 to 7, wherein a lower portion of the reservoir is tapered in a downward direction. By having a cylindrical wall in which a hollow portion is formed, and passing the organic solvent containing deposits from the surface of the cylindrical wall toward the hollow portion, the filtering action of the wall In the filter for removing a clean organic solvent from the hollow part,
A protrusion provided on the surface of a filter support shaft inserted into the hollow portion is engaged with the inner surface of the hollow portion of the filter, and the filter is rotated axially as the filter support shaft rotates. A filter comprising a receiving member. A base tank for storing organic solvents;
A washing tub for washing clothes with the organic solvent;
A filtration distillation means for filtering and purifying the organic solvent and returning it to the base tank,
The filtration distillation means includes
By having a cylindrical wall in which a hollow portion is formed, and passing the organic solvent containing deposits from the surface of the cylindrical wall toward the hollow portion, the filtering action of the wall A filter that removes a clean organic solvent from the hollow portion;
A filter rotating means for rotating the filter axially, and removing deposits adhering to the surface of the filter in an organic solvent staying outside the filter;
A storage container that is provided at a lower part of the filter and that naturally falls, receives the organic solvent containing the deposited matter that has been wiped off, and temporarily stores the solvent;
Separation means that is provided in the storage container and separates and discharges the upper organic solvent and the lower organic solvent in the storage container;
And a distiller for distilling the separated lower organic solvent. A method for purifying an organic solvent stored in a base tank and supplied to a washing tank to wash clothes,
Divide the organic solvent after washing into two parts, one with heavy specific gravity and one with low specific gravity.
A portion having a high specific gravity is selectively removed, purified by distillation, and returned to the base tank.
A method for purifying an organic solvent, wherein a portion having a low specific gravity is returned directly to the base tank.   The method for purifying an organic solvent according to claim 11, wherein the portion having a low specific gravity is filtered before being returned to the base tank. In a filtration distillation apparatus for filtering and distilling organic solvents that are sent from a base tank to a washing tank and dry-clean clothes,
A filtration distillation apparatus provided with sludge removing means for removing sludge adhering to the surface of the filter.

Images