JP2000121244A - Solvent vapor processing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solvent vapor processing system in which non-required items contained in the processed items can be dissolved and removed, a solvent processing efficiency and a working efficiency are high and it is not necessary to separate the non-required items dissolved and removed from the processed items from the solvent. SOLUTION: A solvent recovering circuit S in a solvent vapor processing system 1 is constituted by a seal-closed processing tank 2; a solvent vapor generating device 3 having a water layer 31 within the device and a solvent liquid layer 30 below the water layer 31 formed therein; supplying pipes 33, 35, 36 connecting the solvent vapor generating device 3 with the processing tank 2; and returning pipes 37, 39, 49 to 52 for returning the solvent within the processing tank 2 to the solvent vapor generating device 3. The return pipes 37, 39 of the solvent recovering circuit S are provided with a pump device 5 for feeding out solvent vapor toward the solvent vapor-generating device 3 and a condenser 8 for liquefying the solvent vapor. Solvent vapor gasified by a heater device 17 at the solvent vapor-generating device 3 is contacted with water in the water layer 31 to become solvent vapor accompanying with steam, and the solvent liquid liquefied by the condenser 8 passes through the pipes 48 to 52 and is recovered at the solvent vapor generating device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solvent vapor treatment system for dissolving and removing unnecessary substances present inside an object to be treated by using a solvent vapor of a chlorine-based organic solvent and steam accompanying the solvent vapor. is there.

[0002]

2. Description of the Related Art Conventionally, a solvent vapor treatment system of this kind includes exposing an object to be treated such as wood to solvent vapor of a chlorine-based organic solvent such as methylene chloride (hereinafter simply referred to as a solvent) and water vapor. Thus, there is known a system in which a solvent vapor and water vapor penetrate into an object to be processed and unnecessary substances in the object are dissolved and removed. Such a solvent vapor processing system is disclosed in, for example, JP-A-6-137775 (wood processing) and JP-A-7-323.
No. 15 (wood treatment), JP-A-7-292489 (metal treatment), JP-A-8-170101 (iron powder treatment), JP-A-8-165586 (steel material treatment), JP-A-8-131
No. 705 (processing of garbage etc.).

FIG. 5 shows a main part of a solvent vapor processing system disclosed in these publications. In the solvent vapor processing system shown in the figure, a mounting table 113 is hollowly disposed in a processing tank 2 a including a closed container 110 and a lid 111, and the workpiece 20 is mounted on the mounting table 113. Processing tank 2a
The solvent tank 1 is opened and closed by opening and closing the on-off valve 117.
The chlorine-based organic solvent fed from 15 through the solvent supply pipe 116 is stored as a solvent liquid layer 30, and the water sent from the water supply device W through the water supply pipe 119 is formed as an aqueous layer 31 on the upper layer of the solvent liquid layer 30. Will be stored. Solvent liquid layer 30
Is operated by opening and closing the on-off valve 114 from the boiler B.
The high-temperature water vapor sent to 12 is heated to a vaporizable temperature (for example, about 80 ° C. when the solvent is methylene chloride) to be a solvent vapor. Then, the solvent vapor comes into contact with water when passing through the upper water layer 31 and entrains water vapor having a saturated vapor pressure. The object to be processed 20 is exposed to the solvent vapor accompanying the water vapor generated in this manner to dissolve unnecessary substances present on the surface and inside of the object to be processed 20 and then to dissolve the object to be processed 20
Drain from When the solvent vapor treatment of the article to be treated 20 is completed, the processing tank 2a is allowed to cool to near normal temperature, and then the solvent at the bottom of the tank is withdrawn from the liquid drain pipe 118 and returned to the solvent tank 115. ing.

[0004] By the way, the fact that pits (wall holes) communicating with adjacent tracheids are formed in the cell wall partitioning the tracheids in the wood tissue is described in the report of the Japan Wood Research Society Research Subcommittee (Wood Science and utilization technology II (2. Chemical treatment of wood)),
7th to 11th pages, issued in 1991. " The outline of these wood structures is shown in FIG. Cell wall 122 partitioning adjacent tracheids 120 and 121 has wall hole edges 125 and 12 having wall holes 123 and 124, respectively.
A lens-shaped hollow space is formed between the five. Further, a plate-shaped talls 128 is suspended in a hollow space by a permeable margo 126. Said tracheid 120,1
21 and the inside of the hollow space are originally filled with the water 127, but when the water 127 is lost in one of the tracheids 120 due to drying or the like after logging (see FIG. 3A), The water 127 in the hollow space evaporates from the wall hole 123 toward the tracheid tube 120. As a result, the talls 128 and the margot 126 move toward the tracheid 121 (see FIG. 3B), and finally close the wall hole 124 (see FIG. 3C).

[0005] When the wall hole 124 is closed in this manner, the water 127 remaining in the tracheid 121 becomes difficult to evaporate. It is needless to say that since the number of tracheids in wood is innumerable and there are more wall holes, it is difficult to dry due to blockage of the wall holes. By the way, according to the general natural drying method,
It takes about a year to dry the tree until it is no longer thin. Therefore, when "wood" is processed by the solvent vapor processing system shown in FIG. 5, the solvent vapor and water vapor penetrate into the tracheid inside the wood, and dissolve the tolls and margot, etc., which close the wall holes, and dissolve the wall. The holes are opened to allow the tracheids to communicate with each other. Thereby, it takes about two to three days to dry it up to about one year according to the natural drying method.

[0006]

In the above-mentioned conventional solvent vapor processing system, it is necessary to extract the solvent and the hot water from the processing tank 2a before taking out the object to be processed 20 after a series of solvent vapor processing. . However, the solvent heated to, for example, about 80 ° C. has a strong odor and may be deficient in oxygen. Therefore, it is necessary to wait until the processing tank 2a is cooled to the condensation temperature of the solvent or less. As a result, the processing efficiency and work efficiency have been reduced over time.

When the solvent or water that has penetrated deep into the wood is extracted from the wood, the inside of the processing tank 2a is evacuated. At that time, sap such as wood tarnish comes out of the wood. Since the exuded sap is mixed with the solvent,
The solvent after the treatment cannot be returned directly to the solvent tank 115, and the sap must be separated and removed by another separation device or the like. Therefore, a great deal of labor and time are required for the separation and removal operation, or an expensive separation device is required.

The present invention has been made in view of the above-mentioned conventional problems, and it is needless to say that unnecessary substances can be dissolved and removed. It is an object of the present invention to provide a solvent vapor treatment system that does not need to separate an unnecessary substance dissolved and removed from a substance from a solvent.

[0009]

In order to achieve the above object, a solvent vapor treatment system according to the present invention exposes an object to be treated to solvent vapor and water vapor of a chlorine-based organic solvent in a closed treatment tank. A solvent vapor treatment system for dissolving and removing unnecessary substances inside or on the surface of the object to be treated, wherein the treatment tank and the treatment tank are provided separately and independently, and a water layer composed of water and a water layer A solvent liquid layer comprising a chlorine-based organic solvent is formed in the lower part of the vessel, and a solvent vapor generator having a heating device for heating the solvent liquid layer, and a solvent provided by connecting the solvent vapor generator and the processing tank. A solvent recovery circuit is constituted by a supply pipe for supplying steam, a processing tank and a solvent vapor generator connected to each other, and a return pipe for returning the chlorine-based organic solvent in the processing tank to the solvent vapor generator, Solvent recovery A pump device for sending solvent vapor to the solvent vapor generator and a condenser for liquefying the solvent vapor are provided in the return pipe of the path, and the solvent vapor vaporized by the heating device in the solvent vapor generator is turned into water in the water layer. And a solvent vapor accompanied by water vapor, and the solvent liquid liquefied by the condenser is recovered by a solvent vapor generator via a return pipe.

The chlorine-based organic solvent used in the present invention has a higher specific gravity than water, for example, methylene chloride (CH ₂ Cl ₂ , specific gravity = 1.32, boiling point = 39.7).
C), trichloroethylene (CHCl = CCl ₂ , specific gravity = 1.46, boiling point = 87 ° C.), Freon 113 (CCl ₂
FCClF ₂ , boiling point = 47.6 ° C.).
Since these solvents have a lower boiling point than water (100 ° C.),
When the processing tank is cooled, the steam is condensed first, and unnecessary substances flowing out of the processing object are discharged together with the water, so that the separation and recovery of the solvent and the water become extremely easy, and the energy required for heating is reduced. is there. Further, as the object to be treated, an object containing an unnecessary substance soluble in a chlorine-based organic solvent, such as wood, metal, steel, iron powder, garbage, or the like, is applied. As an unnecessary material in the object to be treated,
In the case of wood, it is composed of metal such as Thors and Margot which closes the hole, metal, steel, iron powder, etc. In the case of FRP waste, the binder is a binder that combines a synthetic resin and a reinforcing fiber.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a solvent vapor processing system according to one embodiment of the present invention. In the figure, a solvent vapor processing system 1 of the present embodiment has a closed processing tank 2 for accommodating an object to be processed 20 and processing it with a solvent vapor or the like, and is independent of the processing tank 2 for generating a solvent vapor. , A pipe 45 and a trap 2 at the bottom of the processing tank 2.
1 and a water recovery tank 2 connected via a pipe 46
2 and tanks such as a solvent recovery tank 14 for temporarily storing a solvent liquid for recovering the solvent in the processing tank 2. The solvent vapor generator 3 and the processing tank 2 are connected by supply pipes 33, 35, 36 for supplying solvent vapor.

As shown in FIGS. 2 to 4, the solvent vapor generator 3 has a water layer 31 made of water formed therein, and a solvent liquid made of a chlorine-based organic solvent below the water layer 31. A layer 30 is to be formed. The solvent vapor generator 3 has a cylindrical mixed liquid tank 60 having a side opening.
And a lid 61 for opening and closing the side opening of the mixed liquid tank 60, and a solvent vapor outlet nozzle 62, a water vapor blow nozzle 63, a solvent liquid inlet nozzle 64, and a water supply inlet nozzle provided on the upper part of the mixed liquid tank 60. 65 and the mixed liquid tank 6
Heating device 1 disposed at the position where the solvent liquid layer 30 is immersed
7 is provided with a heated steam inlet nozzle 66 and a heated steam outlet nozzle 67 which are connected to the tank 7, and a tank bottom nozzle 68 provided at the bottom of the mixed liquid tank 60. The liquid level of the water layer 31 in the solvent vapor generator 3 is measured and monitored by a water level gauge 32. The tank bottom nozzle 68 is connected to the one-touch joint 53 and the on-off valve 78 used at the time of introducing and extracting the solvent. The water supply inlet nozzle 65 is connected to the water supply device W. Further, a chilled water pipe 18 for sending chilled water from the cooling device C is connected in the middle of the piping of the heating device 17, and is used for adjusting the heating temperature of the solvent vapor generator 3 and for forced cooling. .

Referring again to FIG. 1, the processing tank 2 is configured so as to be openable and closable and hermetically sealed so that the processing object 20 is accommodated in a state mounted on a mounting table (not shown). A spray nozzle serving as a tip of a supply pipe 36 is provided in the processing tank 2, and a steam pipe 19 connected to the boiler B is arranged for heating the tank. A pipe 45 provided at the bottom of the processing tank 2 is connected to the upper part of the trap 21. Above the trap 21, a pressure equalizing pipe 44 connected to the processing tank 2 and a steam pipe from the boiler B are connected. The lower part of the trap 21 and the water recovery tank 22 are connected via a pipe 46. The water recovery tank 22 has a hanging partition and an upright partition in the tank,
Water under the hanging partition and exceeding the standing partition is discharged to a drum 24 by driving a water pump 23.

In the middle of a return pipe 37 connected to the upper part of the processing tank 2, a blower 4 and a pump device 5 as a vacuum pump are connected in parallel. The end of the return pipe 37 branches into a pipe 38 having the heater 6 and a return pipe 39 having the condenser 8. The heater 6 is connected to the pipe 3
8 is heated by exchanging the solvent vapor or steam from the boiler 8 with the high-temperature steam guided from the boiler B to the steam pipe 7 and then heated.
It is sent to 0. The condenser 8 cools the solvent vapor or steam from the return pipe 39 by exchanging heat with the low-temperature refrigerant guided from the refrigerating apparatus R to the refrigerant pipe 9, and then sends the cooled refrigerant to the pipe 41 or the return pipe 49. I have. A bypass pipe 42 is connected between the pipe 41 on the outlet side of the condenser 8 and the pipe 38 on the inlet side of the heater 6. The bypass pipe 42 converts the solvent vapor and water vapor during circulation into condenser 8.
The opening and closing valve 102 is opened when the cooling is performed too much or the heating is performed too much by the heater 6.

A pipe 34 branched from the supply pipe 33 extends to near the bottom of the spray tank 26, and an aeration pipe 27 is provided at the tip thereof. The water in the water layer 31 in the spray tank 26 is spray-circulated from the spray pipe 29 to the upper space in the tank by driving the spray pump 28. One end of the pipe 43 is branched and connected in the middle of the pipe 34.
The pipe 43 is connected to the pipes 41 and 40 in the middle, and then the terminal is connected to the middle of the supply pipe 35. Trap 1
The pressure equalizing pipe 48 connected to the upper part of the condenser 8
And a return pipe 49 connected to the bottom of the condenser 8 and the steam pipe 11 from the boiler B are connected. Trap 1
0 and the solvent recovery tank 14 are connected to return pipes 50 and 51.
Connected through. A pipe 47 branched from the pipe 46 is connected to a connection position of the pipes 50 and 51.

The solvent recovery tank 14 stores the solvent liquid (a very small amount of water) flowing from the return pipe 51 while cooling it with cold water in a cold water pipe 15 connected to the cooling device C. Is driven to return to the solvent vapor generator 3 via the return pipe 52. That is, the solvent vapor generator 3 and the supply pipes 33, 35, 36
, The processing tank 2, the pump device 5, the condenser 8, the trap 10, the solvent recovery tank 14, the return pipe 37,
39, 49, 50, 51, 52, the solvent recovery circuit S
Is configured. The cooler 12 is connected to the upper part of the solvent recovery tank 14 by piping, and
The solvent vapor from 4 is condensed by exchanging heat with the low-temperature refrigerant introduced from the refrigerating device R to the refrigerant pipe 13 so as to be condensed and released to the atmosphere as little as possible.

The pipes 34, 38, 40 to 43, 4
5 to 47, supply pipes 33, 35, 36, return pipe 37,
39, 49, 52, equalizing pipes 44, 48, and others
Opening / closing valves 71 to 102 (numbers are shown in circles) which are opened / closed by a control signal from a control device (not shown) or manually are provided, respectively. The alphabetic symbols indicating the types of instruments in the circle in FIG. 1 are LA for liquid level alarm, LC for liquid level control, TI for temperature display, TA for temperature alarm, TC for temperature control, and TC for temperature control.
A is a pressure alarm, and PC is a pressure control. In addition, all the tanks and containers constituting the present solvent vapor treatment system 1 are formed of closed containers in order to prevent odorous chlorine-based organic solvents from scattering into the atmosphere. The processing tank 2 is also a pressure-resistant container that can withstand a vacuum state during use.

Next, a description will be given of a process of subjecting the processing object 20 to the solvent vapor treatment by the solvent vapor treatment system 1.
In the solvent vapor processing system 1, mainly the processing tank 1
The next evacuation step, the solvent vapor supply step, the solvent vapor circulation step, and the processing tank secondary evacuation step are performed. Each of these steps will be described sequentially.

"Processing tank primary evacuation step" First, on-off valves 75, 82, 83, 84, 86, 92, 93, 96
Is “open” and at least the on-off valve 7 of the remaining on-off valves
3,74,77,80,81,85,89,98,10
2 is set to "closed" to complete the system lineup in advance. Further, the inside of the solvent vapor generator 3 is maintained at a temperature at which the solvent can be vaporized (for example, about 80 ° C. when methylene chloride is used) by the heating device 17. As a result, the solvent vapor vaporized from the solvent liquid layer 30 is transferred to the aqueous layer 3
(1) Contact with water to form a solvent vapor accompanied by water vapor. on the other hand,
The inside of the processing tank 2 is at normal temperature. Therefore, when the pump device 5 is driven, the inside of the processing tank 2 is evacuated to about 50 Torr, so that, for example, air or the like is extracted from the inside of the workpiece 20.

[Solvent Vapor Supply Process] Next, the pump device 5 is stopped from the line-up state of the previous process, and the on-off valve 72,
74 is set to “open” and the on-off valve 75 is set to “closed”. Then, the vacuum state in the processing tank 2 serves as a driving source, and “solvent vapor accompanying water vapor” from the solvent vapor generator 3 is supplied into the processing tank 2 via the supply pipes 33, 35, and 36. Then, the workpiece 20 is exposed to the supplied solvent vapor accompanying the water vapor.

[Solvent Vapor Circulation Process] Subsequently, on-off valves 73, 75, 80, 81, 84, 85, 8
6, 87, 89 are opened and the on-off valve 72 is closed. On-off valves 90, 91 for the heater 6 or the condenser 8,
The opening and closing valve 102 is controlled to open and close so as to adjust the inside of the processing tank 2 to a target temperature. Then, when the blower 4 is driven, the solvent vapor and steam in the processing tank 2 are sucked into the blower 4 via the return pipe 37, and further guided to the heater 6 or the condenser 8 from the pipe 38 or the return pipe 39. The solvent vapor and the water vapor guided to the heater 6 are heated and then flow into the pipe 43 via the pipe 40, and the solvent vapor and the water vapor guided to the condenser 8 are cooled and then discharged to the pipe 4
1 flows into the pipe 43. The solvent vapor and steam at a predetermined temperature flowing into the pipe 43 return to the processing tank 2 via the supply pipe 36. The circulation process of the solvent vapor is 6 to 8
It is continuously executed for about a time, whereby the solvent vapor and water vapor penetrate deep inside the object 20 to be processed,
Unnecessary substances inside the processing object 20 are dissolved in the solvent and the warm water.

Unnecessary substances that have flowed out of the article to be treated 20 fall to the bottom of the treatment tank 2 and, together with water condensed at the bottom, pass through the pipe 45, the trap 21, the pipe 46, and the water recovery tank 22 to the drum 24. Stored and discharged. In this solvent vapor circulation step, by heating the inside of the processing tank 2 by passing high-temperature steam through the steam pipe 19, unnecessary substances inside the processing object 20 are easily melted and the fluidity is increased. The operation of increasing the pressure in the processing tank 2 by the blower 4, the switching of the on-off valve, and the pump device 5
By alternately repeating the operation of evacuating the inside of the processing tank 2 by the drive of, unnecessary objects can be more easily taken out.

[Processing tank secondary vacuuming step] Each of the on-off valves is operated in the same manner so as to return to the lineup state of the primary vacuuming step described above. The inside of the processing tank 2 is again evacuated while being kept at about 80 ° C. As a result, the solvent, the warm water, and the unnecessary substances dissolved therein are extracted from the inner part of the processing target 20. In this case, the solvent vapor reaches the condenser 8 via the return pipe 37, the pump device 5, and the return pipe 39. Then, the solvent liquid condensed and liquefied in the condenser 8 is transferred from the return pipe 49 to the trap 10, and further returned from the return pipes 50 and 51 to the solvent recovery tank 14.
Is stored in When the solvent liquid becomes equal to or higher than a predetermined liquid level in the solvent recovery tank 14, the solvent liquid is recovered by the solvent pump 16 via the return pipe 52 to the solvent vapor generator 3. On the other hand, unnecessary substances and water that have fallen to the bottom
From the drum 21 via a trap 21 and a water recovery tank 22.

At this time, in the trap 10, the on-off valves 95, 96 are first closed and the on-off valves 92, 93 are opened, so that the trap 10 is made to be able to flow out of the condenser 8 at a uniform pressure and the solvent liquid is stored. Is done. When the amount of the stored solvent liquid reaches a predetermined level, the liquid level control (LC) is activated, and the on-off valves 92 and 93 are opened.
Is closed and the on-off valves 95 and 96 are opened, and the trap 10 is opened.
The inside is pressurized by the steam from the boiler B, and the solvent liquid is pumped to the solvent recovery tank 14. On the other hand, in the trap 21, the on-off valves 97, 100 are closed and the on-off valves 74, 76,
When 77 is opened, water is stored in a state where it can flow out of the processing tank 2 at an equal pressure. When the amount of stored water reaches a predetermined level, the liquid level control (LC) is activated, the on-off valves 76, 77 are closed, and the on-off valves 97, 99, 100 are opened. Thereby, the inside of the trap 21 is pressurized by the steam from the boiler B, and the water is pumped to the water recovery tank 22. According to the configuration and control mode of the traps 10 and 21 and the related equipment, water and a solvent liquid can be stored and discharged regardless of whether the pressure in the processing tank 2 or the condenser 8 is normal pressure or vacuum. it can. On the other hand, when the temperature of the processing tank 2 decreases and the solvent condenses and the amount of the solvent in the trap 21 increases, the on-off valve 99 is closed, and the on-off valve 98 is opened to supply the solvent in the trap 21 via the pipe 47. Transfer to the solvent recovery tank 14.

When a series of solvent vapor processing is completed, the processing tank 2 is allowed to cool to a temperature lower than the vaporization temperature of the solvent, and air is further introduced into the processing tank 2 so that the processing object 20 can be treated. It is in a state where it can be taken out. In each of the above-described steps, all the solvent vapor released from the safety valve (not shown) of each tank is led to the spray tank 26. On the other hand, when the processing tank 2, the solvent vapor generator 3, and each pipe generate a solvent vapor to be released at a predetermined pressure or more, these solvent vapors are introduced from the aeration pipe 27 to the spray tank 26 through the pipes 34 and 43. I will These solvent vapors are supplied to the spray pump 2
The water circulated through the spray pipe 8 and the spray pipe 29 is trapped by being dropped into the water layer 31 and is not directly released to the atmosphere.

When the processing object 2 is “wood”, the processing tank 2 is heated by the high-temperature steam in the steam pipe 19 and heated by the heater 6 following the above-described secondary vacuuming step. By circulating in the blower 4 while circulating, the "wood drying step" can be performed as it is. Therefore,
Unlike the conventional system, there is no such a problem that the wood after the solvent vapor treatment is once taken out of the treatment tank and the wood drying process is performed by another drying device after waiting for the temperature of the treatment tank to be reduced to near normal temperature.

As described in detail above, according to the solvent vapor processing system 1 of this embodiment, the unnecessary material inside the object 20 to be treated is caused by the solvent vapor accompanying the water vapor sent from the solvent vapor generator 3 to the processing tank 2. Is dissolved and removed. in addition,
Since the solvent in the processing tank 2 is recovered in the solvent vapor generator 3 by the solvent recovery circuit S, it is only necessary to lower the processing tank 2 to at least a temperature at which water condenses after a series of processing. Thereby, the water separated from the solvent vapor can be extracted from the bottom of the processing tank 2. Therefore, the cooling degree of the processing tank 2 can be small, and the cooling time can be shortened. Incidentally, the time required for the entire series of processes from the start of loading of the processing object 20 into the processing tank 2 to the removal after the solvent vapor processing is about one night to one day, which is half that of the conventional system. In addition, at the time of final evacuation,
Unnecessary substances oozing from zero are discharged together with the water at the bottom of the processing tank 2, so that they are not included in the solvent, and there is no need to perform an operation of separating unnecessary substances from the solvent.

Incidentally, when "wood" is treated by the present solvent vapor treatment system 1, unnecessary materials such as tols and margot are dissolved and removed, and the wall holes between the tracheids are opened.
Wood can be dried more quickly.

Further, in the case of treating "metal, steel material or iron powder" by the present solvent vapor treatment system 1, it has an effect of dissolving and removing the deposits between the metal structures and cleaning the metal surface. A passive film such as iron can be formed to prevent the progress of rust.

When "FRP waste" is to be treated by the present solvent vapor treatment system 1, a binder or the like connecting the synthetic resin of the FRP waste and the reinforcing fiber is dissolved and removed. Since the strength of the FRP waste is greatly reduced, crushing work or the like at the time of disposal can be easily performed.

Further, when "garbage" is treated by the present solvent vapor treatment system 1, fats and water constituting cells such as fish and vegetable waste are dissolved and removed, so that the decomposition of the garbage is accelerated. be able to.

In the solvent vapor supply step of the above embodiment, if the surfactant liquid is sprayed directly onto the processing object 20 in the processing tank 2, the permeability into the processing object 20 is improved. Dramatically improved. Therefore, the undesired object removal effect can be further enhanced. Even in that case, the used surfactant solution is dissolved in water and discharged from the bottom of the tank. However, if a surfactant having a boiling point similar to that of the solvent is developed in the future, the surfactant is simply charged into the solvent vapor generator 3 in advance, and not only the solvent vapor accompanied by the water vapor but also the solvent vapor is added. Surfactant vapor can also be supplied to the processing tank 2.

[0033]

As described above, according to the solvent vapor processing system according to the present invention, unnecessary substances inside the object to be processed are dissolved and removed by the solvent vapor accompanying the water vapor sent from the solvent vapor generator to the processing tank. In addition, even if the processing tank is maintained at a temperature equal to or higher than the solvent vaporization temperature, the solvent can be made into a liquid state by the condenser and recovered to the solvent vapor generator through the solvent recovery circuit. That is, it is not necessary to lower the temperature of the processing tank to the condensing temperature of the solvent after the series of processing, but it is sufficient to lower the temperature to at least the temperature at which water condenses. Thereby, the water separated from the solvent vapor can be extracted from the processing tank, so that the cooling degree of the processing tank can be small and the cooling time can be shortened. Therefore, it is possible to improve the solvent treatment efficiency and the work efficiency. Also,
Unnecessary substances leached from the processing object during the final evacuation are transferred to the water at the bottom of the processing tank, so that they are not included in the solvent, and it is not necessary to perform an operation of separating the collected solvent from the unnecessary substance.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a solvent vapor processing system according to an embodiment of the present invention.

FIG. 2 is a plan view showing a solvent vapor generator used in the solvent vapor processing system.

FIG. 3 is a bottom view showing the solvent vapor generator.

FIG. 4 is a sectional view taken along line AA of the solvent vapor generator shown in FIG.

FIG. 5 is a schematic configuration diagram showing a conventional solvent vapor processing system.

FIG. 6 is an explanatory view showing a tissue in the vicinity of a general wood tracheid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solvent vapor processing system 2 Processing tank 3 Solvent vapor generator 5 Pump device 8 Condenser 17 Heating device 20 Workpiece 30 Solvent liquid layer 31 Water layer 33,35,36 Supply piping 37,39,49-52 Return piping 126 Margot (example of unnecessary material) 128 Torrs (example of unnecessary material) S Solvent recovery circuit

Claims (1)

[Claims] 1. A solvent vapor processing system for exposing an object to be processed to solvent vapor and water vapor of a chlorine-based organic solvent in a closed processing tank to dissolve and remove unnecessary substances inside or on the surface of the object. The treatment tank and the treatment tank are provided separately and independently, and an aqueous layer composed of water and a solvent liquid layer composed of a chlorinated organic solvent are formed in the vessel below the aqueous layer, and the solvent liquid layer is formed. A solvent vapor generator having a heating device for heating, a supply pipe for supplying a solvent vapor provided by connecting the solvent vapor generator and the processing tank, and provided by connecting the processing tank and the solvent vapor generator, A return line for returning the chlorinated organic solvent in the processing tank to the solvent vapor generator constitutes a solvent recovery circuit, and a pump device for sending the solvent vapor toward the solvent vapor generator to the return line of the solvent recovery circuit. , Solvent evaporation A condenser for liquefying gas is provided, and in the solvent vapor generator, the solvent vapor vaporized by the heating device comes into contact with water in the aqueous layer to become solvent vapor accompanied by water vapor, and the solvent liquid liquefied by the condenser is returned. A solvent vapor processing system configured to be recovered by a solvent vapor generator via a pipe.