JPH05203A - Method and device for distilling and regenerating solvent - Google Patents

Abstract

PURPOSE:To distill and regenerate the dirty liquid of a solvent used for washing of the material to be washed even when this dirty liquid of the solvent is a combustible solvent with good thermal efficiency at low cost by an inexpensive and simple device without possibilities causing combustion. CONSTITUTION:The dirty liquid 2 of a solvent obtained after washing the material to be washed is passed through a heat exchanger pipe T positioned in the noncombustible or fire retardant heating medium liquid. This dirty liquid 2 of the solvent is vaporized by heat-exchanging it for the heating medium liquid 11 in the heat exchange pipe. This vapor is introduced into a cooling pipe 13 positioned in the noncombustible or fire retardant cooling liquid 15. The vapor is condensed by cooling of the cooling liquid 15, liquefied and recovered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for distilling and regenerating a contaminated solvent sewage used for cleaning an object to be cleaned in a cleaning device. And, it is particularly convenient when the solvent waste liquid is flammable.

[0002]

2. Description of the Related Art Hitherto, a distillation regeneration method has been generally used for regenerating a contaminated solvent contaminated liquid which is used for cleaning an object to be cleaned by a cleaning device.

When the solvent waste liquid for the regeneration is nonflammable, no problem occurs, but when the solvent waste liquid is a flammable solvent such as alcohols, terpene solvents, hydrocarbon solvents, etc. However, it becomes highly flammable due to vaporization. Therefore, if the solvent sewage is flammable,
Due to the complicated and large equipment, the distillation and regeneration could be performed only in the place where the fire was strictly controlled. Therefore, it requires a lot of trouble and cost to regenerate the solvent waste liquid.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and it is of course possible to regenerate an incombustible solvent sewage, but it is also possible to safely use a combustible solvent sewage. Moreover, it aims to enable inexpensive distillation regeneration.

[0005]

In order to solve the above-mentioned problems, the present invention places the solvent contaminated liquid used for cleaning the object to be cleaned in a non-combustible or flame-retardant heated heat medium liquid. Supply into the heat exchange pipe, heat exchange with the heat medium liquid in this heat exchange pipe to vaporize the solvent waste liquid, and this vapor is placed in the cooling pipe located in the incombustible or flame retardant cooling liquid. It is characterized in that the steam is supplied, and the steam is condensed in this cooling pipe by the cold air of the cooling liquid to be liquefied and recovered.

Further, as an apparatus for realizing the above method,
The heat exchange pipe that circulates the solvent sewage used to wash the object to be cleaned is connected to the solvent sewage supply source and is inserted into the heated heat carrier liquid that is non-combustible or flame retardant. A cooling pipe located in a non-combustible or flame-retardant cooling liquid is communicated with the pipe, and the solvent vapor vaporized in the heat exchange pipe is condensed and liquefied in the cooling pipe.

The heated heat medium liquid may be selected from perfluorinated liquid, silicone oil, and water.

Further, the cooling liquid may be selected from perfluorinated liquid, silicone oil, and water.

The solvent waste liquid may be a flammable solvent.

Further, the heat exchange pipe may be formed in a coil shape.

Further, the cooling pipe may be formed in a coil shape.

[0012]

The present invention is configured as described above, and the solvent sewage used for cleaning the object to be cleaned is stored in a certain sewage tank or is supplied directly from the cleaning tank of the cleaning device to the heat exchange pipe. To do. Since this heat exchange pipe is located in the non-combustible or flame-retardant heated heat medium liquid, it exchanges heat with the heat medium liquid in the heat exchange pipe to vaporize the solvent waste liquid.

This vaporization differs depending on various conditions such as the temperature of the heat transfer medium liquid and the surface area of the heat exchange pipe. However, the supply of solvent waste liquid to the heat exchange pipe is reduced and the vaporization efficiency is improved. To do. Then, the generated steam is supplied to the cooling pipe.

Since this cooling pipe is located in a non-combustible or flame-retardant cooling liquid, the steam supplied from the heat exchange pipe can be condensed by the cold air of the cooling liquid in the cooling pipe and liquefied and recovered. Will be things.

Further, since the solvent waste liquid exchanges heat with the heat medium liquid in the process of flowing through the heat exchange pipe,
Compared with the method of heating the entire solvent waste liquid, only the solvent waste liquid flowing through the heat exchange pipe is heated and vaporized, and the distillation regeneration with high heat efficiency is enabled.

Further, the solvent waste liquid exchanges heat with the heat medium liquid in the process of flowing through the heat exchange pipe to be vaporized and condensed and liquefied in the cooling pipe. There is no contact with and the danger of ignition can be reliably prevented.

Even if steam leaks from the heat exchange pipe, the cooling pipe, etc., the heat medium liquid and the cooling liquid are non-combustible or flame-retardant, so that there is a risk of ignition. Can be minimized.

Therefore, even if a complicated and expensive apparatus is not used, a cleaning worker who does not have special knowledge can safely regenerate the flammable solvent waste liquid by distillation.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (1) is a main body of a regenerating tank, a waste liquid containing a solvent waste liquid (2) generated in a cleaning device (not shown). Tank (3) and this waste tank
The heating tank (4) that is not in communication with (3), and this heating tank
(4) is composed of a cooling condensing tank (5) in a non-communication state.

Then, the solvent contaminated liquid (2) used for cleaning the object to be cleaned is primarily introduced into the contaminated liquid tank (3) through an introduction pipe (6) connected to the cleaning device. This solvent waste liquid (2)
Is not particularly limited in kind, may be a non-flammable solvent, but is particularly effective when it is a sewage of a flammable solvent such as alcohols, terpene-based solvents, hydrocarbon-based solvents, etc. Is.

Further, a coil-shaped heat exchange pipe (7) is inserted into the heating tank (4), and the heat exchange pipe (7) is connected to the waste water tank (3) via the solenoid valve (8). Connect to the heat exchange pipe (7)
It is configured so that an appropriate amount of solvent waste liquid (2) can be supplied therein. Also, at the lower end of this heat exchange pipe (7),
(2) The waste container (10) for storing the waste inside is connected.

In addition, in the heating tank (4), a non-combustible or flame-retardant heat medium liquid (11) selected from perfluorinated liquid, silicone oil, water, etc. is heated by a heater (12). Filling. Then, heat exchange is performed between the solvent waste liquid (2) supplied into the heat exchange pipe (7) and the heat medium liquid (11) to vaporize the solvent waste liquid (2).

The heat exchange pipe (7) is a cooling condensing tank.
(5) Communication pipe to coiled cooling pipe (13) inserted in
(14) is connected to supply the vapor of the solvent waste liquid (2) to the cooling pipe (13). In the cooling condensing tank (5) in which the cooling pipe (13) is inserted, a non-combustible or flame-retardant cooling liquid selected from perfluorinated liquid, silicon oil, water, etc.
It is filled with (15). Then, heat exchange is performed between the cooling liquid (15) and the steam in the cooling pipe (13), the steam is condensed and liquefied, and the solvent waste liquid (2) is regenerated cleanly. The regenerated solvent that has been condensed and liquefied can be supplied to the storage tank, the cleaning tank of the cleaning device, or the like through the outlet pipe (16).

[0024]

The present invention is constructed as described above,
The solvent sewage exchanges heat with the heat carrier liquid in the process of flowing through the heat exchange pipe, so only the solvent sewage flowing through the heat exchange pipe is heated compared to the method of heating the entire solvent sewage. It vaporizes and enables distillation regeneration with good thermal efficiency.

Further, the solvent waste liquid exchanges heat with the heat medium liquid in the process of flowing through the heat exchange pipe to be vaporized and condensed and liquefied in the cooling pipe. Even if the solvent waste liquid is flammable, the danger of ignition can be reliably prevented.

In addition, even if a steam leak occurs from the heat exchange pipe, the cooling pipe, etc., the heat medium liquid and the cooling liquid are non-combustible or flame-retardant, so that there is a risk of ignition. Can be minimized.

Therefore, a cleaning operator who does not have special knowledge can safely distill and recycle flammable solvent waste liquid without using a complicated and expensive device.

[Brief description of drawings]

FIG. 1 Sectional view

[Explanation of symbols]

2 solvent waste 7 heat exchange pipes 11 Heat medium liquid 13 Cooling pipe 15 Coolant

Claims (12)

[Claims] 1. A solvent contaminated liquid used for cleaning an object to be cleaned is supplied to a heat exchange pipe located in a non-combustible or flame-retardant heated heat medium liquid, and the heat medium is transferred in the heat exchange pipe. The solvent waste liquid is vaporized by exchanging heat with the liquid, and this vapor is supplied to the cooling pipe located in the incombustible or flame-retardant cooling liquid, and the vapor is condensed by the cooling air of the cooling liquid in this cooling pipe. A method for distilling and regenerating a solvent, which comprises liquefying and recovering. 2. A heat exchange pipe for circulating a solvent waste liquid used for cleaning an article to be cleaned is connected to a supply source of the solvent waste liquid, and is inserted into a non-combustible or flame-retardant heated heat medium liquid. The heat exchange pipe is connected to a cooling pipe located in a non-combustible or flame-retardant cooling liquid, and the solvent vapor vaporized in the heat exchange pipe is condensed and liquefied in the cooling pipe. A distillation and regeneration device for solvents. 3. The heated heating medium liquid is a completely fluorinated liquid,
A method for distilling and regenerating a solvent, which is selected from silicone oil and water. 4. The heated heating medium liquid is a completely fluorinated liquid,
Solvent distillation / regeneration device characterized by being selected from silicone oil and water. 5. A method for distilling and regenerating a solvent, wherein the cooling liquid is selected from perfluorinated liquid, silicone oil, and water. 6. A distillation / regeneration device for a solvent, wherein the cooling liquid is selected from perfluorinated liquid, silicone oil, and water. 7. A method for distilling and regenerating a solvent, wherein the solvent waste liquid is a flammable solvent. 8. A distillation / regeneration device for a solvent, wherein the solvent waste liquid is a flammable solvent. 9. A method for distilling and regenerating a solvent, wherein the heat exchange pipe is formed in a coil shape. 10. A distillation / regeneration device for a solvent, wherein the heat exchange pipe is formed in a coil shape. 11. A method for distilling and regenerating a solvent, wherein the cooling pipe is formed in a coil shape. 12. A solvent distillation regenerating apparatus, wherein the cooling pipe is formed in a coil shape.