JPH02207801A - Method and device for recovering cleaning solvent of cleaning machine - Google Patents

Abstract

PURPOSE:To obtain an inexpensive solvent recovery device by connecting plural cleaning tanks, one distillation still, an array of carbon tanks, an array of condensers and if necessary, an array of separators as the equipment with closed pipelines to form a closed system. CONSTITUTION:Materials are cleaned in the cleaning machine 1 having many cleaning tanks 1a-1e by a cleaning solvent pumped up from cleaning soln. tanks 3a-3c, then a part of the cleaning soln. is returned to the tanks 3a-3c, and the remaining cleaning soln. is transferred to the distillation still 10. The vaporized solvent is then liquefied by the condensers 12a and 12b, water is removed, as required, by separators 2a and 2b, and the regenerated cleaning solvent is recovered into the cleaning soln. tanks 3a-3c. Furthermore, the vaporized solvent from the cleaning machine 1, cleaning soln. tanks 3a-3c and air tanks 16 is adsorbed and desorbed by the carbon tanks 15a and 15b in the closed system. As a result, an inexpensive cleaning solvent recovery device is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for recovering a cleaning solvent for a washing machine, and more specifically, to a method and apparatus for recovering cleaning solvent for a cleaning machine, and more specifically to a method for recovering cleaning solvents for cleaning machines, and more specifically, for recovering objects to be cleaned such as metal, glass or semiconductor parts by various methods. The present invention relates to a method and an apparatus for recovering a cleaning solvent for a cleaning machine, which has ancillary equipment that can recover and regenerate the cleaning solvent by systemizing the cleaning solvent for the cleaning machine.

[Conventional technology]

A method and apparatus for recovering a solvent gas when dry cleaning an object to be cleaned such as a cloth using a washer drum type cleaning machine is known from Japanese Patent Publication No. 60-29519 and others.

On the other hand, optical lenses, eyeglass lenses and liquid crystal glasses.

Freon-based solvents are also used for cleaning semiconductor parts and the like. Figure 2 shows a typical cleaning device.
Ultrasonic, wave cleaning tank (21), cold bath (22), steam tank (2)
For the washing machine (20) consisting of three tanks in 3), the only device for recovering solvent gas is the cooling coil (24), which requires an additional chiller device g (25), and the top of the paper line is open. Since the gas remains unused, it was possible to comply with the regulations on fluorocarbon gas.In addition, conventional equipment was large, combining a cleaning machine and a solvent gas recovery device. Therefore.

The biggest drawback is that the solvent gas recovery device is larger compared to cleaning machines with multiple cleaning tanks or existing cleaning machines, and it is not possible to design it to match the layout of the factory, and it is expensive. It became.

[Problem to be solved by the invention]

In view of the above circumstances, 1 the present invention lays out essential incidental equipment for recovering cleaning solvents for cleaning machines having a large number of cleaning tanks, systemizes this in accordance with customer requests, and provides an inexpensive solution. The purpose of the present invention is to provide a cleaning solvent recovery method and device for cleaning machines that comply with fluorocarbon gas regulations.

(Means for Solving the Problems) The present invention provides a method for cleaning an object to be cleaned using a cleaning solvent pumped from a cleaning liquid tank in a washing machine having a large number of cleaning tanks, and then transferring a part of the cleaning liquid to the cleaning liquid tank. After reducing and transferring other cleaning liquid to a distillation tank, the evaporated solvent is liquefied in a condenser, water is removed by a separator as necessary, and the regenerated cleaning solvent is recovered to a cleaning liquid tank. The cleaning solvent recovery method for a cleaning machine in which the evaporated solvent gas from the cleaning machine, the cleaning liquid tank, and the air tank is adsorbed by a carbon tank and the underwear is collected in a closed system, and for the cleaning machine consisting of a large number of cleaning tanks, the cleaning liquid tank and at least A closed system consisting of one distillation can, a series of carbon tanks, a series of condensers, and ancillary equipment connected to a series of separators as necessary, to recover and regenerate the cleaning solvent from the washer. This is what we provide.

[For production]

Since the present invention is configured as described above, after the cleaning solvent pumped from the cleaning liquid tank cleans the object to be cleaned in a washing machine having a large number of cleaning tanks, a part of the cleaning liquid is returned to the cleaning liquid tank, The other cleaning liquid is transferred to the still and the solvent is evaporated and transferred to the condenser. On the other hand, waste is discharged as sludge. The evaporated solvent is liquefied by cooling water in a condenser, and then water is removed from the liquefied solvent by a separator if necessary, and the regenerated cleaning solvent is poured into a cleaning liquid tank. Meanwhile, the evaporated solvent gas from the washer, the cleaning liquid tank, the condenser, and the air tank connected to the separator is adsorbed by the carbon tank and desorbed by steam alternately, and the desorbed solvent gas is transferred to the condenser. A series of such processes is performed in a closed system to recover and regenerate the cleaning solvent.

〔Example〕

In the present invention, the cleaning solvent recovery device for a cleaning machine having a large number of cleaning tanks means that the solvent gas is processed by one recovery device for a cleaning machine having two or more cleaning tanks, and the cleaning machine is a shower It can be applied to any of the following methods: type, jet type, immersion type, rocking type, stirring type, ultrasonic type, and steam type.

The distillation can referred to in the present invention is a distillation can that is equipped with a steam pipe, indirectly heats the contaminated cleaning liquid, separates the contaminated sludge, and extracts a clean solvent gas component. A stand is necessary.

The carbon tank used in the present invention refers to a tank filled with activated carbon for adsorbing solvent gas, and at least one tank is required to perform only adsorption.

A series of at least two tanks is required to perform adsorption as well as desorption.

The condenser referred to in the present invention is a device for cooling the solvent gas desorbed by sending steam into the distillation can and activated carbon from around the coil to liquefy the solvent.
One capacitor is sufficient, but efficient processing requires a series of two capacitors.

The separator referred to in the present invention refers to an oil-water separator, and a series of two separators, one of the specific gravity separation type and the other of the filtration type separation type, may be provided.

This is not necessary if the solvent gas is not desorbed from the carbon tank by steam, and if no moisture enters the tank.

In the present invention, the final rinsing of the above-mentioned auxiliary equipment is performed using a fresh solvent, but the pre-process cleaning is performed using an extremely low concentration contaminated solution, all of the equipment is cleaned using a recycled new solution, or the entire product is washed using a shower. The solvent gas generated in the process is automatically collected and regenerated through a closed system configured with a sealed type with a combination of piping that meets each request, such as ensuring that the solvent gas generated in the carbon tank is adsorbed and not released into the atmosphere. It is.

Hereinafter, embodiments of the present invention will be described based on the drawings. 1st
The figure is a flow sheet of a cleaning solvent recovery device for a washing machine, which shows one embodiment of the present invention.

(1) The washing machine of the present invention is a washing machine consisting of a large number of cleaning tanks: No. 1 (la), No. 2 (lb), No. 3 (lc), No. 4 (ld), and No. 5 (1e). The machine is a cleaning solvent recovery device that can be applied to a multi-tank system with at least two or more tanks. When cleaning machines are categorized by processing method, shower cleaning uses pressure liquid of no more than 2 kg/cdG.

Medium-pressure shower cleaning that sprays a pressure liquid of 2 to 30 kg/aJG, high-pressure jet cleaning that sprays a pressure liquid of 40 to 150 kg/aJG, immersion cleaning that immerses the object in the accumulated liquid or running water in the tank, and shakes the object to be cleaned in the tank. Submerged rocking or rotational cleaning that moves or rotates, submerged jet agitation cleaning that stirs the liquid in a tank using air or a pump, ultrasonic cleaning that uses ultrasonic vibration, and solvent-based steam. There is a steam cleaning method that cleans with water.

The cleaning solvent recovery device of the present invention can be used for any of them.

In the case of a complex multi-tank cleaning machine, it is used to remove flux after soldering printed circuit boards that use electronic equipment, to remove resin and chips from precision-machined metal parts, and to clean various materials that use organic solvents. Used for etc. Also, 10 to 16
A large multi-tank cleaning machine with six tanks has optical lenses,
Glass for glasses.

The cleaning solvent recovery device of the present invention can be applied to any object to be cleaned related to liquid crystal glass or semiconductors.

The device of the invention has a series of separators. The separator is for separating oil and water, and in this embodiment, it has a series of separators consisting of two separators: a first separator (2a) and a second separator (2b). The first separator (2a) is of a specific gravity separation type, and the second separator (2b) is of a glass filter filtration separation type, and both are arranged side by side with a step.

In the second separator (2b), 1.1.2-trichloro-1
゜2. Inject a new solution of 2-trifluoroethane (hereinafter referred to as "new solution Freon"). A third tank (3C) and a second tank are located between the second separator (2b) and the washer (1).
The tank (3b) and the first tank (3a) are connected to each other by sequentially providing steps. Therefore, the fresh Freon liquid put into the second separator (2b) overflows sequentially to the third tank (3c), the second tank (3b), and the first tank (3a).
) is charged.

The first new liquid Freon introduced into the first tank (3a) is passed through the new liquid line (5) by the pump (4).

Each cleaning tank (1a), (lb), (lc), (ld),
(le) Or pumped into one of these cleaning tanks 1
It is used for the second cleaning. In addition, the first fresh Freon liquid put into the second tank (3b) is also passed through the new liquid line (5) by the pump (4) to each cleaning tank (la).
, (lb), (lc), (ld), (1e) or any one of them and after being used for the second cleaning, the solution line (6), button trap (7) It falls into the fourth tank (3d) via the pump (8) and the first tank (3d) via the cartridge filter (9).
Reduce to 3a). Furthermore, the first fresh Freon liquid put into the third tank (3C) is also passed through the new liquid line (5) by the pump (4) to each cleaning tank (1a).
After being pumped into (1b), (lc), (id), (is) or any of these cleaning machines for the third cleaning, the solution line (6), button trap (7) It falls into the fourth tank (3d) via the pump (8) and the second tank (3d) via the cartridge filter (9).
b) reduce to Therefore, the initial fresh Freon liquid becomes a low concentration contaminated liquid (hereinafter referred to as "low concentration contaminated Freon") in the case of the second tank (3b), and
In case a), a medium-concentration contaminated liquid (hereinafter referred to as "medium-concentration contaminated Freon") is obtained, and this is circulated as a cleaning liquid.

In the case of a system using piping and circulation as in this example, when normal operation begins, the liquid in the first tank (3a) after the first cleaning with medium-concentration contaminated Freon will become highly contaminated liquid ( (hereinafter referred to as ``highly contaminated freon''), it is necessary to distill it back to fresh freon.

After the first cleaning, high-concentration contaminated Freon should be removed from the solution line (
6), the fourth tank (3) via the button trap (7)
In the present invention, at least one distillation can (10) is required,
The inside of the distillation can (10) is indirectly heated by steam (11) to evaporate the solvent, and the solvent is led from the first condenser (12a) at the top to the second condenser (12b).

On the other hand, filth is discharged as sludge (13). The capacitor of the present invention may be one, or may be a series of two such as a first capacitor (12a) and a second capacitor (12b). This capacitor (12
In a) and (12b), the evaporated solvent is liquefied by the cooling water (14), and the two units in this embodiment operate efficiently.

The liquefied solvent completely liquefied in the second condenser (12b) is transferred from the first separator (2a) to the second separator (2b).
), water is removed, and the regenerated new liquid solvent (hereinafter referred to as "regenerated fresh Freon") is transferred to the third tank (
3c) and used for the third and final rinse. Note that if the solvent contains only a solvent and no moisture, the separators (2a) and (2b) are not required.

The apparatus of the present invention also has a series of carbon tanks (15a) and (tsb) filled with activated carbon, each cleaning tank (1a) and (tb).
.

(1c), (1d), (le), each tank (3a), (
3b), (3c) and an air tank (1) connected to the second condenser (12b) and separators (2a), (2b).
6) adsorbs evaporated solvent gas. When two carbon tanks are used, adsorption and desorption are performed alternately; desorption is performed using steam (17), and drying is performed using hot air heated by outside air (18) with a steam heater (19).

The apparatus of the present invention comprises cleaning liquid tanks (3a), (3b), (
3c) and a small number of distillers (10), a series of carbon tanks (15a), (15b), a series of condensers (12a), (12b) and optionally a series of separators (2a), (2b) The cleaning solvent from the cleaning machine is collected and regenerated by sealing the piping of the incidental equipment with (2b) and creating a closed system. A second cleaning was performed with low-concentration contaminated Freon.

This is just an example of performing a third cleaning with recycled fresh Freon solution.

However, when cleaning precision parts such as lenses and semiconductor equipment, it is necessary to always clean them with recycled fresh Freon liquid. In such a case, the liquid washed with the first new Freon liquid charged into the second tank (3b) is not returned to the first tank (3a), but is transferred to the distillation can (10), and The system has been established so that the first new liquid Freon washed into the third tank (3C) is transferred to the distillation can (10) without being returned to the second tank (3b), and both are used as recycled new liquid. There is a need to.

In addition, in the case of a shower or jet-type cleaning machine,
Recovery of solvent gas components is more important than contaminated solvent, so
The carbon tank used as a closed system must have a capacity commensurate with this, and the carbon tank may be of a cartridge type, for example, and may have a dedicated system for adsorption and desorption.

In short, the device of the present invention allows the connection of the above-mentioned auxiliary equipment to be changed as appropriate, and allows the cleaning solvent generated from the cleaning machine to be recovered and recycled, thereby addressing regulations such as fluorocarbon regulations. .

【Effect of the invention〕

The main feature of the present invention is that various types of solvent gas recovery devices can be used for cleaning machines having a large number of cleaning tanks, and it is very inexpensive.0The present invention does not use a cooling coil method. So.

It does not require a chiller device, nor does it require a water supply device, filter, or separate pump.

The present invention is applicable to existing or newly installed washing machines having a large number of washing tanks, and to washing machines scattered within a factory.
A centralized management method can be adopted.

The cleaning machine can also be a closed box type, and best of all, since only the cleaning part is required, the cleaning machine becomes very small.

In the present invention, the cleaning machine is small, and by using a closed system, solvent loss is extremely small and running costs are low.

Previously, if there was a shower or jet type cleaning machine in the immersion type cleaning machine, a separate recovery device was required for each type of cleaning machine, but this system can be used with any type of cleaning machine to regenerate and evaporate contaminated solvent. and gas recovery.

It can be done with one machine at the same time.

The present invention is systematized with a layout according to individual needs, and can be rearranged by appropriately changing the connections as necessary, so it can also be used for precision cleaning of semiconductors and other materials. This is Shiuruchino.

For example, in the case of a steam cleaning method, it is necessary not to disturb the paper layer, and for this purpose, it is necessary to slowly lower the basket containing the objects to be cleaned to be lowered into the cleaning tank, and then slowly raise it.

Therefore, depending on the location of this cleaning tank, the processing speed of the takt process has been hindered.

However, according to the device of the present invention, it is possible to increase the number of small cleaning tanks in this part as much as necessary and speed up the process.
Takt processing can be done freely.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet of a cleaning solvent recovery device for a washing machine showing an embodiment of the present invention, and FIG. 2 is a flowchart of a cleaning solvent gas recovery device for a washing machine showing a conventional example. (1)...Washing machine (la) = (lb), (lc) t (ld)
-(le) ''Cleaning tank (2a), (2b)...
Separators (3a), (3b), (3c)...Washing liquid tank (10)...Distiller (12a), (12b)...Condenser (1)
5a), (15b) ...Carbon tank (16
)...Air tank

Claims (4)

[Claims] (1) After cleaning the object to be cleaned in a washing machine having multiple cleaning tanks with the cleaning solvent pumped from the cleaning liquid tank, a part of the cleaning liquid is returned to the cleaning liquid tank, and the other cleaning liquid is transferred to the distillation tank. The evaporated solvent is then liquefied in a condenser, water is removed by a separator as necessary, and the regenerated cleaning solvent is recovered into the cleaning liquid tank, and the cleaning solvent is also removed from the cleaning machine, cleaning liquid tank, and air tank. A cleaning solvent recovery method for a cleaning machine, characterized in that adsorption and desorption of evaporated solvent gas in a carbon tank is performed in a closed system. (2) For cleaning machines with multiple cleaning tanks, ancillary equipment that connects a cleaning liquid tank, at least one distillation can, a series of carbon tanks, a series of condensers, and a series of separators as necessary is closed. What is claimed is: 1. A cleaning solvent recovery device for a washing machine, characterized in that the system collects and regenerates cleaning solvent from the washing machine. (3) The cleaning machine according to claim (2) is characterized in that the washing machine is a shower type, jet type, immersion type, rocking type, stirring type, ultrasonic type, steam type, or boiling type, and is a single or combined type. Solvent recovery device for washing machines. (4) The cleaning solvent recovery device for a cleaning machine according to claim (2), wherein the object to be cleaned by the cleaning machine is a metal, a lens, a ceramic, or a semiconductor.