JPS6357082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method and a solvent recovery device for recovering volatile solvents from distillation residue in a still in a dry cleaner.

[Conventional technology and issues]

As shown in FIG. 2, the one-cycle cleaning process in a conventional dry cleaner consists of a large amount of heat from indirectly heated steam that supplies contaminated solvent that has flowed into a distiller 2 from a contaminated solvent inlet 1 to a heating section 4 from an indirectly heated valve 3. In this case, the solvent gas is indirectly distilled and then introduced into the condenser 5 for recovery. If this cycle is repeated 10 to 20 times a day, distillation residue will accumulate in the distiller 2. This residue is called oily sludge, and is a mixture of surfactants, solvents, light oil components, organic acid esters, and the like.

On the other hand, a filter 6 is attached to remove fine dust and other impurities from the solvent, and fine powder such as diatomaceous earth is introduced into the solvent, but if the diatomaceous earth becomes clogged due to accumulation of impurities, After the last cycle of the day, the valve 7 is opened in the distiller 2 to allow diatomaceous earth to fall together with the solvent. This diatomaceous earth sludge is a mixture of 70% volatile components such as water, oil, surfactants, and organic matter, and 30% ash. After the mixture with the oily sludge undergoes indirect distillation, the direct heat valve 8 is opened to perform direct heat distillation using the azeotrope between water vapor and the solvent to recover the solvent.

Next, the lid (not shown) of the distiller 2 is opened to scrape out the distillation residue, but at this time, the residue still contains a large amount of solvent and the solvent is diffused into the distiller, resulting in a loss of solvent. The residue is large and gives off an unpleasant odor, causing pain to workers and making it difficult to scrape off the residue. The amount of solvent loss varies depending on the type of dry cleaner, but to give an example, the amount of solvent contained in the distillation residue in a 1,1,1 trichloroethane group with a processing capacity of 20 kg/washer is approximately 2.2
A total of 3.4 kg and approximately 1.2 kg of the solvent diffused in the distiller.
Kg is the solvent loss.

In addition, since the solvent is released into the atmosphere, it causes air pollution, which is undesirable. For example, the permissible concentration for occupational safety and health of 1,1,1 trichloroethane is
This means that compared to 200 ppm, a high concentration of tens of thousands of ppm or more is being discharged from the scraping outlet.

The same applies to dry cleaners that use perchlorethylene or R113.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to recover the solvent gas diffused in the distiller and the solvent contained in the residue, thereby significantly reducing the amount of solvent loss. The purpose of the present invention is to provide a recovery method and a solvent recovery device.

[Means for Solving the Problems] The first invention of the present application includes a washing process in which the laundry is placed in a drum of a dry cleaner main body and washed using a solvent while rotating the drum, and a washing process in which the laundry in the drum is washed after the washing process. There is a deliquification process in which the used solvent is introduced into a distiller and the solvent is distilled and recovered, and after the deliquification process, the blower, heater, and condenser installed in the circulation path connected to the drum are operated to blow hot air onto the items to be washed. a drying step in which the solvent gas evaporated from the object to be washed is guided to a condenser in the circulation path and the solvent is condensed and recovered;
Following the drying step, the method includes a deodorizing step in which the solvent gas in the drum is guided to the solvent recovery device using the blower to recover the solvent, and then fresh air is introduced into the drum and the air in the drum is exhausted to the outside of the machine. In a wet dry cleaner, the sludge containing the solvent to be accumulated in the distillation chamber of the still is heated, the vaporized solvent gas is led to a condenser to condense and recover the solvent, and then fresh air is introduced into the distillation chamber. At the same time, a blower installed in the circulation path of the dry cleaner body is operated to guide the residual solvent gas through the circulation path to the solvent recovery device and recover the solvent. .

The second invention of the present application includes a washing means for placing the laundry in a drum of the main body of a dry cleaner and washing the laundry using a solvent while rotating the drum, and a method for guiding the used solvent in the drum to a distiller after the washing process and dissolving the solvent. After the deliquification process, a blower, a heater, and a condenser installed in the circulation path connected to the drum are operated to blow hot air onto the items to be washed, and the solvent gas evaporated from the items to be washed is removed. A drying means for guiding the solvent to a condenser in the circulation path and condensing and recovering the solvent, and following the drying process, the solvent gas in the drum is guided by the blower to the solvent recovery device to recover the solvent, and then fresh air is introduced into the drum. The dry cleaner is equipped with a deodorizing means for guiding the air inside the drum to the outside of the machine, and is arranged in the circulation path of the dry cleaner main body that connects the distillation chamber of the distiller to the solvent recovery device. It is connected to the circulation path through a first duct that opens facing the suction side of the blower, and is connected to the condenser through a second duct, and a fresh air intake is connected to the distillation chamber through a check valve. The main point is to establish the following.

[Effect]

According to the solvent recovery method and solvent recovery device in a distiller in a dry cleaner according to the present invention, the solvent gas remaining in the drum and on clothes can be completely discharged from the drum using a blower or the like, and benefits from solvent recovery can be obtained. will improve. In addition, since no solvent is released into the atmosphere, air pollution is prevented, which is preferable in terms of environmental hygiene.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIG. Here, FIG. 1 is an explanatory diagram showing an example of a solvent recovery device in a dry cleaner according to the present invention. First, this solvent recovery device will be explained.

Reference numeral 11 in the figure is a dry cleaner main body, and articles to be washed are placed in a drum 12 of the dry cleaner main body 11 and washed using a solvent.
The drum 12 is equipped with a dust filter 13 and a blower 1.
4, a circulation path 18 having a heater 15, a water-cooled condenser 16, and a damper 17 are connected. Here, when the blower 14, heater 15, and water-cooled condenser 16 are operated, hot air is blown onto the items to be washed, and the solvent gas evaporated from the items to be washed is transferred to the circulation path 1.
The solvent is guided to a water-cooled condenser 16 in the 8, and the solvent is condensed and recovered. On the suction side of the blower 14, there is a first duct 2 with a gate valve 19 interposed therein.
A distiller 21 is connected via 0. The distiller 21 functions to guide the used solvent left in the washing drum 12 and recover the solvent. The distiller 21 is provided with a heating chamber 23 for heating the residual residue 22. A solvent filter 25 is connected to the distiller 21 via a gate valve 24, and the solvent filter 25 is connected to the dry cleaner main body 11.
is connected to. A condenser 27 is connected to a distillation chamber (not shown) of the distiller 21 via a second duct 26. The distiller 21 includes:
A fresh air intake 29 with a check valve 28 interposed therein is provided. The drum 1 is connected to the top of the distiller 21 and the bottom of the solvent filter 25 through ducts equipped with a pump 30 and a button trap 31, respectively.
Connected to 2.

An inlet 33a of a frozen recovery device 33 is connected to the discharge port 12a of the drum 12 via a third duct 32.
is connected. On the other hand, this frozen recovery device 33
The outlet portion 33b of is connected to the drum 12 via a fourth duct 34. Here, the frozen recovery device 33 has a built-in regenerator cooler 35, and the regenerator 35 cools a regenerator connected to a refrigerator 36 through a refrigerating circuit 37 to about -20°C.
Further, the upper chamber 33c of the frozen recovery device 33 is provided with the aforementioned inlet portion 33a, and the third duct 32 attached thereto is equipped with control valves 38 and 39. One control valve 37 is connected to the steam inlet section 3
The other control valve 39 opens and closes the exhaust port 39a to communicate and close the outside of the machine and the inside of the third duct 32. The lower chamber 33d of the frozen recovery device 33 is provided with the outlet portion 33b, and the fourth duct 3 attached thereto
4 is equipped with control valves 40 and 41. Here, one control valve 40 is a fresh air intake port 40a.
The outside of the machine, which is opened and closed, and the inside of the fourth duct 34 are communicated and closed. A condensate collection device 42 is provided in the lower chamber 33 and connected to a water separator 43 and a solvent tank 44 .

Such a solvent recovery device connects the distillation chamber of the distiller 21 via the first duct 20 to the suction side of the blower 14 disposed in the circulation path 18 of the dry cleaner main body 11 that communicates with the freezing recovery device 33.
The drum 12 is connected to the condenser through the second duct 20, and the fresh air intake port 29 is provided in the distillation chamber through the check valve 28.
The solvent gas remaining inside the drum 12 and on the clothes can be completely discharged from the drum 12 by the blower 14 or the like, and the profits from solvent recovery are improved. Furthermore, since no solvent is released into the atmosphere, air pollution can be prevented, which is preferable in terms of environmental hygiene.

Next, 1,1,1
A case will be described in which the solvent in the distiller 21 is recovered using trichloroethane.

In the method of the present invention, the discharge port 12 of the washing drum 12
The solvent gas discharged from a is guided through the third duct 32 to a freezing recovery device 33 where it is condensed and separated into a solvent liquid and a gas component, and the condensed solvent liquid is passed through a water separator 4.
2, where the gas is separated from moisture and recovered, and the separated gas is returned to the washing drum 12 through the fourth duct 34, and after the circulation drying process, the freezing recovery device 33 and the third duct 32 and cut off communication with the fourth duct 34 (control valves 38, 3
9, 40, and 41 are indicated by two-dot chain lines), fresh air is supplied from the fourth duct 34 into the washing drum 12, and the air is exhausted outside the machine through the third duct 32. , to recover the solvent remaining in the dry cleaner main body 11 and clothes.

On the other hand, a predetermined number of washers (for example, 15 washers/
When the filter pressure in the solvent filter 24 increases, the gate valve 24 is opened and the solvent and diatomaceous earth in the solvent filter 25 are allowed to fall into the distiller 21, and the conventional prescribed distillation process is carried out as much as possible. A condenser 27 condenses and recovers the solvent gas.

Next, the damper 17 is opened and the control valves 38, 40 are opened.
is "open" and the control valves 39 and 41 are "closed" (the fresh air intake port 41a and the exhaust port 39a are closed), the water-cooled condenser 15 and the blower 14 are operated, the heater 15 is stopped, and the gate valve is closed. 24 is opened, the solvent gas diffused in the distiller 21 is led to the regenerator cooler 35 via the first duct 20, dust filter 13, blower 14, water cooling condenser 15, and third duct 32, where it is condensed and recovered. . Furthermore, the volume reduction due to this condensation and recovery becomes negative pressure, and fresh air is taken into the distiller 21 via the check valve 28.
The diffused solvent gas in the distiller 21 is successively led to the regenerator cooler 35, and the solvent contained in the distillation residue 22 continues to be distilled and is led to the regenerator cooler 35 where it is condensed and recovered.

In order to judge whether or not the solvent in the distillation residue 22 has been recovered, the temperature of the air returning from the lower chamber 33d of the freezing recovery device 33 to the washing drum 21 (usually about -20°C)
This is done by checking. After recovering the solvent, the removal lid of the distiller 21 is opened and the residue is scraped out.

According to the method of the present invention, the sludge containing the solvent to be accumulated in the distillation chamber of the distiller 21 is heated, the vaporized solvent gas is led to the condenser 19 to condense and recover the solvent, and then the sludge is freshly stored in the distillation chamber. At the same time as introducing air, the blower 14 disposed in the circulation path 18 of the dry cleaner main body 11 is operated, and the residual solvent gas is passed through the circulation path 18 to the freezing recovery device 3.
3 to recover the solvent, the solvent gas remaining in the drum 12 and on the clothes can be completely discharged from the drum 12 using a blower 14 or the like.
Increased profits from solvent recovery. Furthermore, since no solvent is released into the atmosphere, air pollution can be prevented, which is preferable in terms of environmental hygiene.

In the above embodiment, the case where a frozen recovery device is used as the solvent recovery device is described, but the invention is not limited to this, and an activated carbon recovery device 45 as shown in FIG.
may be connected to the discharge port 12a of the drum 12.

In the above embodiment, the air inlet from the fourth duct 34 to the washing drum 15 is connected to the heater 1.
In the drying process, the circulating air is heated by the heat of the heater 14 and supplied to the clothing, thereby expelling the solvent from the clothing and improving the solvent recovery rate.

〔Effect of the invention〕

As detailed above, according to the present invention, the solvent diffused in the distiller and the solvent in the residue can be efficiently recovered, so the loss of solvent is significantly reduced, the profits from solvent recovery are significantly improved, and the It is possible to provide a method and a solvent recovery device for recovering a solvent in a distiller in a dry cleaner, which prevents air pollution by avoiding the release of solvent into a dry cleaner, and is extremely superior in terms of environmental hygiene.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a solvent recovery device according to the present invention,
Figure 2 is a schematic explanatory diagram of a conventional solvent recovery device;
The figure is a block diagram showing another example of the solvent recovery device according to the present invention. 11...Dry cleaner body, 12...Drum, 13...Dust filter, 14...Blower, 1
5...Heater, 16...Water-cooled condenser, 18...
... Circulation path, 20 ... First duct, 21 ... Distiller, 22 ... Distillation residue, 25 ... Solvent filter,
26...Second duct, 28...Check valve, 32...
Third duct, 33... Refrigeration recovery device, 34... Fourth duct, 43... Water separator, 44... Solvent tank.

Claims (1)

[Claims] 1. A washing process in which the laundry is placed in the drum of the dry cleaner body and washed using a solvent while rotating the drum, and after the washing process, the used solvent in the drum is transferred to a distiller and the solvent is removed. There is a deliquification process in which the liquid is distilled and recovered, and after the deliquification process, a blower, a heater, and a condenser installed in the circulation path connected to the drum are activated to blow hot air onto the items to be washed, which evaporates from the items. There is a drying process in which the solvent gas is guided to the condenser in the circulation path and the solvent is condensed and recovered.Following the drying process, the solvent gas in the drum is guided by the blower to the solvent recovery device to recover the solvent, and then fresh air is introduced. The dry cleaner is equipped with a deodorizing process in which air is introduced into the drum and the air inside the drum is exhausted outside the machine.The sludge containing the solvent that is accumulated in the distillation chamber of the still is heated, and the vaporized solvent is removed. The gas is led to a condenser to condense and recover the solvent, and then fresh air is introduced into the distillation chamber, and a blower installed in the circulation path of the dry cleaner body is operated to remove the remaining solvent gas through the circulation path. A method for recovering a solvent in a distiller in a dry cleaner, characterized in that the solvent is introduced into the solvent recovery device via the solvent recovery device and the solvent is recovered. 2. A washing method in which the items to be washed are placed in the drum of the dry cleaner body and washed using a solvent while rotating the drum, and a deliquification method in which the used solvent in the drum is led to a distiller after the washing process and the solvent is distilled and recovered. After the deliquoring process, a blower, a heater, and a condenser installed in the circulation path connected to the drum are operated to blow hot air onto the items to be washed, and the solvent gas evaporated from the items to be washed is removed from the circulation path. A drying means that condenses and recovers the solvent gas that is guided to the condenser, and following the drying process, the solvent gas in the drum is guided to the solvent recovery device using the above-mentioned blower to recover the solvent gas, and then fresh air is introduced into the drum and the air inside the drum is removed. In a dry cleaner which can be equipped with a deodorizing means for exhausting water to the outside of the machine, the dry cleaner faces the suction side of a blower disposed in the circulation path of the dry cleaner main body that connects the distillation chamber of the distiller to the solvent recovery device. The distillation chamber is connected to the circulation path through a first duct that opens at , and is connected to the condenser through a second duct, and a fresh air intake is provided in the distillation chamber through a check valve. A solvent recovery device in a distiller in a dry cleaner.