JPH0763562B2 - Separator for organic solvent in gas - Google Patents

Description

TECHNICAL FIELD The present invention relates to a separator for condensing and separating an organic solvent from a gas containing an organic solvent gas, for example, exhaust gas from a cleaning tank of a factory.

[Conventional technology]

A conventional device for separating an organic solvent in a gas is disclosed in Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Publication No. 40684, etc., a cooling medium composed of liquid nitrogen or the like is sprinkled and brought into contact with a reaction gas containing an organic solvent such as vinyl chloride monomer to be cooled, and the organic solvent is condensed and separated. I have to.

[Problems to be solved by the invention]

However, since the conventional separation device has a large structure and requires complicated and expensive equipment, the structure cannot be simplified at all. Moreover, the organic solvent gas cannot always be efficiently condensed and separated.

The present invention has been made in view of the above problems, and provides a separator for an organic solvent in a gas, which can simplify the structure and can efficiently condense and separate the organic solvent gas. Is intended.

[Means for Solving the Problems]

In the present invention, in order to achieve the above-mentioned object, an inlet opening for an organic solvent-containing gas is provided at one end of the ceiling wall, an outlet opening thereof is provided at the other end, and a liquefied refrigerant gas injection device is provided in the center to provide a liquefied refrigerant gas. In the inside of the treatment tank adapted to eject in the direction of the lower bottom, a partition wall having a large number of communication holes is vertically provided between the inlet opening and the liquefied refrigerant gas ejection device, and the treatment tank is discharged with an organic solvent gas. The gas containing the organic solvent is connected to the middle of the pipe to cool the gas containing the organic solvent to below the condensation point, and the organic solvent gas and water are condensed and collected.

[Work]

When separating a gas containing an organic solvent in the present invention having the above configuration, a gas containing an organic solvent is introduced into the processing tank from the introduction pipe together with air, and the liquefied refrigerant is directed toward the lower bottom portion in the processing tank. Is spouted and supplied.

Then, the liquefied refrigerant is instantly depressurized and vaporized, and the liquefied refrigerant becomes a refrigerant gas at a significantly lower temperature than the condensation of the organic solvent, and the air containing the organic solvent gas in the treatment tank is condensed to a temperature lower than that of the organic solvent. Since the cooling is performed, the organic solvent gas and the water vapor in the processing tank are condensed, and the air and the refrigerant gas separated from the organic solvent gas are discharged to the outside from the outlet opening of the processing tank. In this case, if a refrigerant, such as carbonic acid or nitrogen, which does not cause much damage even if released into the atmosphere as it is, can be released into the atmosphere as it is.

The condensed solvent and water in the treatment tank are led out to the separation tank from the outlet. Further, since a partition wall having a large number of communication holes is vertically provided in the processing tank, it is ensured that the air containing the organic solvent gas introduced from the introduction pipe does not cool but goes out from the discharge pipe. It becomes possible to prevent it. Also, although water and organic solvent liquid are heated in the separation tank, they are separated into an aqueous layer and an organic solvent liquid layer due to the difference in their specific gravities, so only the organic solvent liquid is taken out from the solvent outlet pipe and recovered, Can be used.

〔Example〕

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

In FIG. 1, reference numeral 1 denotes a hermetically sealed processing tank whose periphery is covered with a heat insulating material. An inlet opening 2 and an outlet opening 3 are provided at positions apart from each other on the peripheral edge side of a ceiling wall, and an injection port 4 is provided at the center. Is provided. Reference numeral 5 denotes an organic solvent gas generation tank, and an air suction port 6 and an air discharge port 7 for air containing the organic solvent gas are provided in the closed lid. The inlet opening 2 of the treatment tank 1 is connected to the discharge outlet 7 of the generation tank 5 by the introduction pipe 8, and the outlet opening 3 is connected to the suction fan 9 by the discharge pipe 10 to introduce the introduction pipe 8, the treatment tank 1, and the discharge pipe. A gas passage containing an organic solvent is formed in the pipe 10. Reference numeral 11 denotes a partition wall having a large number of communication holes, which prevents the air containing the organic solvent gas introduced from the introduction pipe 8 from leaving the discharge pipe 10 without being cooled. It is provided in.

The jetting device is provided with a liquefied refrigerant having a temperature lower than that in which the organic solvent gas in the processing tank 1 is condensed, for example, a refrigerant storage tank 12 of liquefied carbonic acid or liquefied nitrogen, and a refrigerant supply pipe 13 provided with a valve 14, 1 is connected to the jet port 4.

A reservoir 15 and a discharge port 16 for the condensed organic solvent are provided at the bottom of the treatment tank 1, and the condensed organic solvent is taken out of the treatment tank 1 intermittently or constantly. A water separation tank 17 is provided with a solvent outlet pipe 19 and a water discharge pipe 18.

Then, the organic solvent gas generated in the generation tank 5 is introduced into the processing tank 1 from the introduction pipe 8 together with air by the suction fan 9 provided in the discharge pipe 10. On the other hand, the liquefied refrigerant in the refrigerant storage tank 12 is jetted and supplied from the refrigerant supply pipe 13 into the processing tank 1. Then, the liquefied refrigerant is instantly depressurized and vaporized,
The liquefied refrigerant becomes a refrigerant gas having a temperature significantly lower than that of the organic solvent condensing, and cools the air containing the organic solvent gas in the processing tank 1 to a temperature lower than that of the organic solvent condensing.
The organic solvent gas and water vapor in the inside are condensed, become organic solvent liquid or water, respectively, and are collected in the storage section 15, and appropriately discharged from the discharge port 16 to the water separation tank 17. The air and the refrigerant gas from which the organic solvent gas has been separated are discharged from the processing tank 1 through the outlet pipe 10. Since a partition 11 having a large number of communication holes is vertically provided in the processing tank 1, the air containing the organic solvent gas introduced from the introduction pipe 8 is not cooled but flows out from the discharge pipe 10. It is possible to reliably prevent this. In the water separation tank 17, the water and the organic solvent liquid are separated into a water layer and an organic solvent liquid layer due to the difference in specific gravity, so that only the organic solvent liquid can be taken out from the solvent outlet pipe 19 and recovered for reuse.

In this case, if a refrigerant, such as carbonic acid or nitrogen, which does not cause much damage even if released into the atmosphere as it is, can be discharged into the atmosphere as it is.

FIG. 2 is an example in which a separation device 21 according to the present invention is provided in a cleaning device 20 that uses an organic solvent as a cleaning liquid. Cleaning tank 22
Is a three-tank type washing tank, which is surrounded by a suction hood 23, and a separating device 21 is attached to an exhaust pipe of the suction hood 23 equipped with an exhaust fan 24.
The inlet opening 2 of the processing tank 1 is connected. A cooling coil 25 is provided around the vapor phase portion of the cleaning tank 22. 26 is a gutter, and the air suction port of the cleaning tank 22 is omitted.

In this embodiment, a part of the organic solvent gas generated in the cleaning tank 22 is condensed by the cooling coil 25 and collected from the gutter 26.
Most of the organic solvent gas is introduced from the suction hood 23 into the separation device 21. Most of the organic solvent gas is mostly condensed in this separation device 21, and clean air containing almost no organic solvent gas is discharged from the outlet opening 3 of the processing tank 1 to the atmosphere.
The liquid organic solvent separated from the condensate collected from the gutter 26 and the liquid organic solvent separated in the water separation tank 17 of the separator 21 are returned to the cleaning tank 22 again and used as a cleaning liquid.

FIG. 3 shows an arrangement in which clean air discharged from the processing tank 1 of the separator 21 and containing almost no organic solvent gas is circulated without being released to the atmosphere.

The inlet opening 2 of the processing tank 1 is connected to a suction hood 27 by piping, and the outlet opening 3 is connected to a drying air blowing nozzle 28 provided facing the suction hood 27 by a clean air supply pipe 29. Then, the hoop treated with the organic solvent is sprayed on the nozzle.
The hoop is dried by running between the suction hood 27 and the suction hood 27. In this embodiment, the liquid organic solvent adhering to the hoop is evaporated by the clean air sprayed from the spray nozzle 28, and the air containing the organic solvent gas is introduced from the suction hood 27 into the processing tank 1. It The clean air from which the organic solvent has been separated in the processing tank 1 is again jetted from the spray nozzle 28 through the clean air supply pipe 29 and is used for drying.

In Fig. 4 and 5, liquefied nitrogen is used as the liquefied refrigerant, and the temperature in the treatment tank 1 is jetted into the treatment tank 1 at about 1 m ³ / min and the temperature in the treatment tank 1 is -20 to -35.
The experimental results when cooled to ℃, the organic solvent is the fourth
The figure shows trichloroethane, and FIG. 5 shows trichlorotrifluoroethane.

〔The invention's effect〕

As described above, according to the present invention, an inlet opening is provided at one end, an outlet opening is provided at the other end, and a partition wall having a large number of communication holes is provided inside a processing tank provided with a liquefied refrigerant gas injection device at the center thereof. It is installed vertically between the inlet opening and the liquefied refrigerant gas jetting device, and this processing tank is connected to the middle of the organic solvent gas discharge pipe to cool the gas containing the organic solvent in the processing tank to below the condensation point, and the organic solvent. Since the gas and the water are condensed and collected, the structure can be simplified and the organic solvent gas can be condensed and separated very efficiently and easily. Further, a great cooling effect can be obtained, and the gas containing the organic solvent can be cooled to a low temperature until the organic solvent is instantaneously condensed. If a cooling gas having a temperature below the solidification temperature of the organic solvent is used, the organic solvent can be recovered in a solid state. Further, since the partition wall provided with a large number of communication holes is vertically provided in the processing tank, it is ensured that the air containing the organic solvent gas introduced from the introduction pipe is not cooled and flows out from the discharge pipe to the outside. Can be expected to prevent. Further, since the treatment tank is simply connected to the middle of the organic solvent gas outlet pipe, there is a special effect that the treatment tank can be easily applied to various kinds of equipment using organic solvents.

[Brief description of drawings]

FIG. 1 is a flow chart of an embodiment of the present invention, FIGS. 2 and 3 are flow charts of different embodiments, and FIGS. 4 and 5 are graphs showing organic solvent gas concentration values at an inlet and an outlet, respectively. 1 ... Treatment tank, 2 ... Inlet opening, 3 ... Outlet opening, 4 ...
… Jet port, 5 …… Generation tank, 6 …… Air suction port, 7 …… Outlet port, 8 …… Inlet pipe, 9 …… Suction fan, 10 …… Outlet pipe, 11 …… Partition wall, 12 …… Refrigerant Storage tank, 13 ... Refrigerant supply pipe, 14 ... Valve, 15 ... Reservoir, 16 ... Discharge port, 17 ...
Water separation tank, 18 …… Water discharge pipe, 19 …… Solvent outlet pipe, 20 ……
Cleaning device, 21 ... Separation device, 22 ... Cleaning tank, 23 ... Suction hood, 24 ... Exhaust fan, 25 ... Cooling coil, 26 ...
Gutter, 27 …… Suction hood, 28 …… Spray nozzle, 29 …… Clean air supply pipe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taichi Aizawa, 3-1, 1-1, Sakaemachi, Hamura-cho, Nishitama-gun, Tokyo Within Marine Electric Co., Ltd. (72) Inventor Takashi Suzuki 3-chome, 1-chome, Hamura-cho, Nishitama-gun, Tokyo Address No. 5 within Kaiyo Denki Co., Ltd. (56) Reference JP-A-53-40684 (JP, A)

Claims (1)

[Claims] 1. An inlet opening 2 for an organic solvent-containing gas is provided at one end of a ceiling wall, an outlet opening 3 thereof is provided at the other end, and a liquefied refrigerant gas injection device 4 is provided at a central portion of the liquefied refrigerant gas toward a lower bottom portion. A partition 11 having a large number of communication holes is vertically provided between the inlet opening 2 and the liquefied refrigerant gas jetting device 4 inside the processing tank 1 which is designed to jet the organic solvent gas. An organic solvent in a gas, characterized in that the gas containing an organic solvent is connected to the middle of the pipe 10 to cool the gas containing the organic solvent to a temperature below the condensation point to condense and recover the organic solvent gas and water. Separation device.