JPH0515725A - Apparatus for concentrating and recovering solvent - Google Patents

Abstract

PURPOSE:To recover not only a solvent having a high b.p. and easy to decompose but also a solvent diffused into air in low concn. with high quality and high efficiency by combining a concn. part concentrating solvent-containing gas to be treated in high concn. with a low temp. condensing recovery device recovering a solvent by condensation or freezing. CONSTITUTION:Gas to be treated is passed through the treatment zone 1a of a rotor 1 composed of an activated carbon honeycomb molded object to make the solvent in said gas adsorbed. The solvent adsorbed on the rotor 1 is desorbed by regenerating gas and this solvent conc. gas is sent to condensing towers 2, 3. The freezing of the solvent conc. gas by cooling and the thawing of frozen matter by freezing gas are alternately repeated in the coolers of the condensing towers 2,3. By this method, the solvent is once frozen from the solvent conc. gas and subsequently thawn to be recovered as a liquid. As a result, not only a solvent having a high b.p. and easy to decompose but also a solvent diffused into air in low concn. can be recovered with high quality and high efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solvent concentrating and recovering apparatus for recovering a solvent after concentrating a low-concentration solvent-containing gas into a high-concentration solvent-containing gas by adsorption / desorption action of activated carbon, and in particular,
The present invention relates to a solvent concentrating and recovering device that is also effective for recovering high boiling point solvents such as fluorocarbons.

[0002]

2. Description of the Related Art In semiconductor manufacturing equipment and precision equipment manufacturing equipment, an organic solvent such as CFC or chlorine is often used, and the organic solvent is separated and removed from indoor or outdoor exhaust air to cause pollution. A solvent recovery device is used for prevention, reuse of recovered solvent, and the like.

In these conventional solvent recovery devices,
A plurality of, for example, a pair of adsorption towers containing a solvent adsorbent such as activated carbon is provided, and the solvent-containing air is introduced into one of the adsorption towers to adsorb and remove the contained solvent into the adsorbent and discharge it as purified air. Then, the solvent already adsorbed in the previous adsorption step is desorbed from the other adsorption tower. It is a conventional vapor-recovery-type solvent recovery apparatus that uses water vapor as energy for this desorption. In addition, heating the adsorbent itself with a sheet heater to desorb the solvent is
It is a dry solvent recovery device.

In any case, since the solvent is desorbed by the heating action, the decomposition of the solvent is often a problem in this heating step.

Further, in order to thoroughly prevent pollution and promote the use of the solvent by recycling, it is increasingly necessary to recover the solvent from the air in which the solvent diffuses at an extremely low concentration.

However, if the solvent-containing gas is introduced into the recovery device as it is, the recovery efficiency is low. Therefore, it is necessary to install a solvent concentrator in the preceding stage. This concentrator normally rotates an activated carbon rotor composed of a honeycomb formed body continuously,
The solvent is adsorbed on the rotor in a part of the process of the rotational movement, and the solvent is desorbed from the rotor by a small amount of hot air in the other part, so that the treated gas is supplied as a high-concentration gas to the recovery device in the subsequent stage.

As described above, in the case of recovering the organic solvent from the air diffused at a low concentration, the demand for recovering the solvent-containing gas having a lower concentration increases, so that the solvent concentrator and the recovery device are combined. Things have come to be used.

[0008]

However, in the recovery system of the combination described above, the solvent is subjected to heating energy a plurality of times and is further decomposed by active steam. Some of the solvents are easily decomposed by heat, and even if the solvent of this kind undergoes a single recovery treatment, its thermal decomposition poses a problem. However, there is a problem that the quality of the recovered solvent liquid is further deteriorated.

The present invention has been made in view of the above problems, and the heating action on the solvent is limited to a minimum in the concentration section in the former stage, and the decomposition action without heating the solvent in the recovery section in the latter stage. An object of the present invention is to provide a solvent concentrating and recovering device capable of recovering a high-quality solvent with high efficiency by recovering the solvent by a low-temperature cooling condensation recovering process capable of recovering the solvent without causing a problem.

[0010]

A solvent concentrating and collecting apparatus according to the present invention comprises a rotor formed of a honeycomb molded body of activated carbon,
Rotating means for rotating this rotor in one direction around its axis to move at least the processing zone, the regeneration zone and the cooling zone, and the solvent-containing processing gas introduced from the external system to the rotor in the processing zone to pass the solvent. A processing gas supply means for adsorbing a clean gas by adsorbing to the rotor, a cooling means for introducing a cooling gas into the rotor of the cooling zone to cool it, and a regeneration means for supplying the regeneration gas to the rotor of the regeneration zone, Condensing means equipped with a plurality of coolers for introducing a regenerated gas after regenerating the rotor and cooling the regenerated gas to a temperature of 0 ° C. or lower to freeze or liquefy the contained solvent; and the regenerated gas. And a selective gas introducing means for selectively and alternately introducing a thaw gas for thawing the condensate in the cooler into the cooler of the condensing means, and thawed by the thaw gas. By separating the solvent and water from the liquid discharged from the serial condensing means and having a liquid separating means for recovering the solvent.

[0011]

In the present invention, the processing gas introduced from the outside air and containing the solvent at a low concentration is supplied to the processing zone of the rotor by the supply means, and passes through the rotor in this processing zone, thereby forming honeycomb of activated carbon. The solvent component in the gas is adsorbed on the body and removed from the gas. As a result, clean gas is obtained.

On the other hand, when the rotor rotates to the regeneration zone, the rotor receives passage of regeneration gas in this regeneration zone. This regeneration gas is heated by, for example, a heating means, and this high temperature regeneration gas desorbs (disengages) the solvent adsorbed on the rotor. Therefore, the post-regeneration gas that has passed through the rotor contains a high concentration of the solvent, and this high-concentration solvent-containing gas is sent to the condensing means of the freeze recovery section.

The rotor moves from the regeneration zone to the cooling zone, where it is cooled by receiving the flow of cooling gas. As a result, the rotor is subjected to the passage of the low-concentration solvent-containing gas in the treatment zone after its solvent desorption action is sufficiently stopped, and the solvent desorbed from the hot rotor mixes into the clean gas. Is prevented.
Therefore, according to the present invention, the solvent can be removed from the low-concentration solvent-containing gas with extremely high efficiency and concentrated at a high magnification. As the cooling gas, a clean gas cleaned by adsorption of a solvent in the processing zone or a part of the low-concentration solvent-containing gas can be used.

The solvent concentrated gas is supplied to the cooler of the condensing means. In the condenser of this condensing means, the solvent in the solvent concentrated gas is cooled to a temperature below the solidification temperature of the solvent, such as -30 ° C. As a result, the solvent in the gas freezes together with the water and is collected in the cooler.

On the other hand, a thaw gas at a temperature at which this frozen product can be thawed is introduced into the cooler in which the solvent and water have already been frozen in the previous step. As a result, the frozen substance in the cooler is thawed and the solvent and water are recovered as a liquid. This liquid is separated into a solvent and water by the liquid separating means. Further, in the cooler after thawing, the frozen substance is removed, so that the cooling ability thereof is restored, and it becomes possible to use it for the next cooling and freezing step.

In the condensing means, this cooling and freezing step and the thawing step are alternately repeated. In addition, when the cooling and freezing process is performed in a part of a plurality of coolers,
Perform the thawing process with another cooler. In this way
The gas discharged from the solvent concentrating section is continuously recovered as a liquid by the condensing means in the subsequent stage.

The cooler of the condensing means may cool the gas at a temperature above the solidification temperature of the solvent. In this case, the solvent is recovered as a liquid without freezing. However, since the water content in the gas freezes and the cooling capacity of the cooler decreases, the condensate is removed by the flow of the thaw gas.

Especially when the boiling point of the solvent is high, the present invention is effective in the case of a solvent having a high boiling point because it is likely to become a liquid or a condensate by cooling.

[0019]

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

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a flon-containing gas concentrating and recovering apparatus for freezing and recovering freon from a flon-containing gas, and FIG. 3 is a front view of a rotor 1 thereof. The rotor 1 has a cylindrical shape or a disk shape, and is rotatably installed around the central axis. Then, the rotor 1 is driven to rotate at a constant speed in a direction indicated by an arrow in FIG. 3 by an appropriate drive source.

Thus, the rotor 1 is formed into a honeycomb shape from activated carbon having an excellent adsorption efficiency for chlorofluorocarbon, and the rotor 1 has a direction in which the pores extend from the honeycomb formed body (that is, the gas passage direction). It is cut out so as to be parallel to the central axis.

The rotor 1 has one end surface (left end surface)
A seal member 22 for the cooling gas discharge chamber D and a seal member 23 for the regenerated gas discharge chamber F are arranged adjacent to each other, while the other end surface (right end surface) of the rotor 1 is regenerated. A seal member 25 for the gas (high temperature gas) introduction chamber E is arranged at a position aligned with the seal member 23. The seal members 22, 23, 25 are pressed against the rotor 1 with an appropriate force, and slide on the rotating rotor 1 to airtightly partition the chambers from the rotor 1. There is. As a result, the space between the inner chambers surrounded by the seal members 22 and 23 becomes the cooling gas discharge chamber D and the regenerated gas (high concentration CFC-containing gas) discharge chamber F, respectively, and the outer space of the seal members 22 and 23 has a low concentration. It becomes the chlorofluorocarbon-containing processing gas introduction chamber A. On the other hand, the inner space surrounded by the seal member 25 serves as a regeneration gas introduction chamber E, and the outer space of the seal member 25 serves as a clean gas discharge chamber B after adsorption of CFCs. Of this clean gas discharge chamber B,
A region matching the cooling gas discharge chamber D (the seal member 22) is a cooling gas introduction region C.

As shown in FIG. 1, the low-concentration chlorofluorocarbon-containing processing gas discharged from a factory or the like is sucked by a blower 8 inserted in the pipe 7 through a pipe 7 and supplied to the introduction chamber A thereof, and the rotor is rotated. Introduced in 1. The clean gas is supplied into the rotor 1 from the cooling gas introduction region C except for the part that is diffused into the atmosphere.

The gas in the cooling gas discharge chamber D is returned to the upstream side of the blower 8 in the pipe 7 through the pipe 9. Also, condensation towers 2 and 3 that freeze and recover CFCs from the concentrated gas
The exhaust gas discharged from the
Is returned to the upstream side of the blower 8.

After the outside air is heated by the heater 10 to become a regeneration gas, it is supplied to the regeneration gas introduction chamber E. This regeneration gas passes from the regeneration gas introduction chamber E to the regeneration gas passage zone 1c of the rotor 1. The regenerated gas containing the solvent at a high concentration is discharged to the regenerated gas discharge chamber F, and then is sent to the condensation towers 2 and 3 of the condensation recovery means by the blower 16 through the pipe 15.

The gas discharged from the condensing towers 2 and 3 is returned to the upstream side of the rotor 1 through the pipes 18a and 18b and the joining pipe 18, respectively, as described above. Piping 15a, 15
b, 18a and 18b respectively have on-off valves 17a, 17b and 1
9a and 19b are interposed and the gas condensing tower 2, 3
It is designed to control the supply to.

The liquid condensed in the coolers of the first and second condensing towers 2 and 3 and the liquid thawed after being frozen in the condensing towers 2 and 3 are respectively separated through the pipe 20 into the separator 4 Collected in. In the separator 4, the water and the solvent are separated by specific gravity, the water is discharged from the drain, and the solvent is recovered in the solvent storage tank 5. The solvent liquid in the tank 5 is sent to an appropriate recovery tank (neither is shown) by a solvent delivery pump.

Next, with reference to FIG. 2, the flow of the refrigerant pipe to the coolers of the first and second condensing towers 2 and 3 will be described. The arrow in FIG. 2 indicates that the cooler of the first condensing tower 2 is performing the cooling cycle and the cooler of the second condensing tower 3 is performing the defrosting (thawing) cycle.

A pipe 31 is provided between the refrigerator 30 and one end of the refrigerant flow pipe arranged in the cooler of the condensing towers 2 and 3.
They are connected by a and 31b and a confluent pipe 31. Electromagnetic on-off valves 32a, 3 for evaporative gas are provided in the pipes 31a, 31b.
2b is interposed. An evaporation pressure adjusting valve 33 is provided in the pipe 31. The refrigerator 30 compresses the introduced gas into high temperature gas. The gas outlet of the refrigerator 30 and the one end of the cooler of the condensation towers 2 and 3 are
The pipe 34 and the branch pipes 34a and 34b are connected. Further, hot gas switching electromagnetic on-off valves 35a and 35b are interposed in the pipes 34a and 34b.

A pipe 36 connected to a condenser 49 is connected to the pipe 34 connected to the high temperature gas outlet of the refrigerator 30 so that a part of the gas discharged from the refrigerator 30 is condensed. It is supplied to 49. Condenser 4
Cooling water is supplied to the inside of 9 to flow therethrough, and the high temperature gas supplied to the condenser 49 is condensed into a high temperature liquid. The refrigerant liquefied in the condenser 49 is the pipe 3
7 and the branch pipes 37a and 37b, respectively, and are supplied to the other ends of the refrigerant flow pipes arranged in the coolers of the condensation towers 2 and 3, respectively. A discharge gas bypass electromagnetic opening / closing valve 38 is interposed in the pipe 36. Further, a flow rate adjusting valve 39 and a refrigerant dryer 40 are interposed in the pipe 37, and the pipe 3
7a and 37b respectively include a cooling circuit switching electromagnetic on-off valve 41.
a, 41b and automatic expansion valves 42a, 42b are interposed. The expansion valves 42a and 42b inject the liquid refrigerant into the coolers of the condensation towers 2 and 3 to evaporate it, and the heat of evaporation cools the solvent-containing gas inside the coolers of the condensation towers 2 and 3. ing.

Further, the other ends of the condensers of the condensing towers 2 and 3 are connected to the pipe 36 through the pipes 43a and 43b and the confluent pipe 43, and the inside of the coolers of the condensing towers 2 and 3 are connected. The gas after thawing the condensate is pipes 43a, 43b and pipe 4
It is supplied to the condenser 49 via 3 and the pipe 36. Check valves 44a and 44b are installed in the pipes 43a and 43b, respectively, and a condensation pressure adjusting valve 45 is installed in the pipe 43.

A differential pressure adjusting valve 46 is arranged between the pipe 34 and the pipe 43, and a pressure type water control valve 47 is provided in the drainage pipe of the cooling water of the condenser 49. The opening degree of the pressure type water control valve 47 is adjusted by the pressure in the pipe 34.

Next, the operation of the flon-containing gas concentrating and recovering device constructed as described above will be explained. The low-concentration chlorofluorocarbon-containing processing gas supplied to the gas introduction chamber A by the blower 8 passes through the portion of the rotor 1 rotating in the adsorption zone 1a, during which the chlorofluorocarbon is adsorbed by the honeycomb formed body of the rotor 1 to generate chlorofluorocarbon. Are removed from the gas. The obtained clean gas is discharged into the discharge chamber B. A part of the clean gas in the discharge chamber B passes as a cooling gas from the cooling region C through the cooling zone 1b of the rotor 1 and cools the rotor 1 during this period, and then is discharged to the cooling gas discharge chamber D. This cooled gas is supplied to the upstream side of the blower 8 in the pipe 7 through the pipe 9. On the other hand, the waste gas discharged from the condensation towers 2 and 3 is also returned to the pipe 7. Then, the outside air is heated by the heater 10 and becomes the high temperature regeneration gas, and is supplied to the regeneration gas introduction chamber E. This regeneration gas passes through regeneration gas passage zone 1
At c, the CFCs passing through the rotor 1 and adsorbed on the rotor 1 are heated and separated from the rotor 1.

In this way, the regeneration gas containing a high concentration of freon (high concentration freon-containing gas) is discharged to the regeneration gas discharge chamber F. This solvent concentrated gas is sent to the condensing towers 2 and 3 by the blower 16 through the pipe 11. As a result, an extremely high concentration of CFC-containing gas can be sent to the condensation towers 2 and 3 and used for CFC recovery.

In the solvent recovery section including the condensing towers 2 and 3, the coolers of the first and second condensing towers 2 and 3 are cooled as shown in FIG.

First, in the case where the cooler of the condensing tower 2 is performing a cooling cycle and the cooler of the condensing tower 3 is performing a defrosting (thawing) cycle, as indicated by the arrows in FIG. The solenoid opening / closing valves 41a, 32a, 35b are opened, and the solenoid opening / closing valve 41
b, 32b, and 35a are closed. Then, the liquid refrigerant supplied from the condenser 49 is dried by the dryer 40 and then injected from the automatic expansion valve 42a into the cooling pipe in the cooler of the condensing tower 2. This refrigerant expands in this cooler (condensing tower 2) and evaporates to cool the solvent-containing gas in the cooler.

After this refrigerant is discharged from the condensing tower 2,
It is returned to the refrigerator 30 via the evaporation pressure adjusting valve 33.
The evaporating pressure adjusting valve 33 adjusts the evaporating pressure of the refrigerant in the condensers of the condensing towers 2 and 3 to adjust its evaporating temperature (for example, -45).
C.) is set, whereby the cooling temperature of the coolers of the condensation towers 2 and 3 is kept constant. In the refrigerator 30, the vaporized and gaseous refrigerant is compressed, and the refrigerant is returned to the condenser 49 as a relatively high temperature gas.

On the other hand, the relatively high temperature refrigerant gas discharged from the refrigerator 30 is also supplied to the cooler of the condensing tower 3.
Then, this refrigerant gas is returned to the condenser 49 via the condensation pressure adjusting valve 45 after thawing the condensate in the condenser of the condensing tower 3. The condensing pressure adjusting valve 45 adjusts the condensing pressure in the coolers of the condensing towers 2 and 3 so that the condensing temperature of the refrigerant becomes, for example, 20 ° C.

In this way, the liquid refrigerant condensed in the condenser 49 is supplied to the cooler of the condensing tower 2 in which the cooling cycle is carried out, and the temperature is always constant (for example, -45 ° C.).
The solvent-containing gas in the cooler is cooled by evaporating in. As a result, this solvent freezes in the cooler of the condensing tower 2. On the other hand, in the cooler 3 that is performing the thawing cycle, a relatively high temperature (for example, 20 ° C.) from the refrigerator 30
The gaseous refrigerant is supplied to thaw the condensate in the condenser of the condensing tower 3. Then, the cooling cycle and the thawing cycle are switched at a predetermined cycle by switching the electromagnetic opening / closing valve, and in the condensing towers 2 and 3, the cooling cycle and the thawing cycle are alternately repeated. First, the on-off valve 1
When 7a and 19a are opened and the on-off valves 17b and 19b are closed, the solvent concentrated gas is supplied to the cooler of the condensation tower 2 and cooled to, for example, -45 ° C. As a result, the solvent in the gas condenses with the water and freezes in the condenser of the condensing tower 2. In this way, the solvent is frozen and removed from the gas, and the uncondensed gas is returned to the pipe 7 which is the inlet of the concentrating section.

On the other hand, in the cooler of the condensing tower 3 in which the solvent and water are condensed in the previous step, the relatively high temperature (for example, 20 ° C.) gaseous refrigerant supplied from the refrigerator 30 flows. As a result, this condensate is thawed and collected as a liquid in the separator 4 via the pipe 20. The liquid refrigerant collected in the separator 4 from the condenser of the condensing tower 3 is subjected to specific gravity separation in the separator 4, water is discharged as drain water, and the solvent is collected in the tank 5 and then reused. Be used for.

Then, after a lapse of a predetermined time, the condenser of the condensing tower 2 shifts to a thaw cycle and the condenser of the condensing tower 3 shifts to a cooling cycle, and the condensate in the condenser of the condensing tower 2 is thawed, and the solvent and water. Are collected in the separator 4 as a liquid. On the other hand, in the solvent concentrated gas, the solvent and water in the gas are frozen in the cooler of the condensing tower 3, and the solvent is removed from the gas. In this manner, the cooling cycle and the thawing cycle are alternately performed in the coolers of the condensing towers 2 and 3, so that the solvent-containing gas is continuously recovered from the contained solvent.

Immediately before the transition from the thawing cycle to the cooling cycle, the refrigerant from the condenser 49 is supplied to the condenser of the condensation tower 2 or 3 which has been carrying out the thawing cycle until then. A few coolers may be cooled. That is, the on-off valves 41a and 41b are simultaneously opened in a short time immediately before switching to this cooling cycle. As a result, the temperature in the coolers of the condensation towers 2 and 3 that are about to switch to the cooling cycle can be lowered, and the cooling cycle can be performed with high efficiency.

In the present invention, the solvent does not necessarily have to be frozen in the condensation towers 2 and 3. In the case of a solvent having a boiling point higher than that of water, cooling first freezes the water. However, the solvent can be recovered with sufficiently high efficiency without freezing.

Further, the condensation product may be thawed by heating with a heater instead of the refrigerant gas.

Furthermore, before the step of freezing and recovering the solvent by the condensation towers 2 and 3, one similar condensation tower having a cooling temperature of 0 ° C. or higher is provided, and the solvent is cooled to recover a part of it as a liquid. It may be configured to do so. When the boiling point of the solvent is high, a part of the solvent can be removed by simply cooling the solvent before freezing and recovering by the condensation towers 2 and 3.

On the other hand, in the solvent concentrating section, as described above, while the rotor 1 rotates at a constant speed in the direction shown by the arrow in FIG. 3, the rotor 1 receives the low concentration CFC-containing gas in the adsorption zone 1a. Fluorocarbon is adsorbed, and then the high temperature regeneration gas is passed through in the regeneration gas passage zone 1c to desorb the fluorocarbon, and then the cooling gas is passed in the cooling zone 1b to be cooled. By repeating such steps, the chlorofluorocarbon is concentrated at an extremely high concentration rate to obtain a high-concentration chlorofluorocarbon-containing gas.

In order to increase the Freon concentration rate, not all the Freons adsorbed on the rotor 1 are desorbed in the regeneration gas passage zone 1c, but the Freons are moved to the adsorption zone 1a with some remaining. It is preferable.

This is because the chlorofluorocarbon desorption rate of the activated carbon is remarkably reduced after a certain time has elapsed after being heated by the high temperature gas. Therefore, the regeneration gas passage zone 1c is lengthened to lengthen the rotor heating time. Is also meaningless in terms of the CFC separation effect.

Further, in the above embodiment, after the passage of the regeneration gas, the rotor 1 passes through the cooling zone 1b and is cooled. This is because when the activated carbon rotor enters the adsorption zone 1a while being heated by the passage of the regeneration gas, the fluorocarbon adsorbed on the rotor and the clean gas exhaust chamber B
This is because there is a difference in the partial pressure of the Freon vapor between the Freon and the Freon, and the Freon is separated from the rotor which is still in a high temperature state, and the Freon is discharged to the clean gas discharge chamber B. Therefore, after passing through the cooling zone 1b, the cooling gas is allowed to enter the adsorption zone 1a, and the regeneration gas passage zone 1c
The portion of the rotor 1 that has been heated to a high temperature is cooled to keep fluorocarbons from coming off easily. This allows
Since the desorbed Freon gas is not mixed in the clean gas, a clean gas having an extremely low Freon concentration can be obtained, in other words, an extremely high concentration of concentrated Freon gas can be obtained.

Further, the uncondensed solvent-containing gas, which is the waste gas of the condensation towers 2 and 3, is returned to the upstream side of the rotor 1 and passes through the rotor 1 again. In this way, the waste gas in the condensing towers 2 and 3 is repeatedly concentrated and provided for collection without being released into the atmosphere. Therefore, even if the recovery efficiency of the condensing towers 2 and 3 is as low as 50%, for example, the recovery efficiency of the entire recovery apparatus is improved.

[0051]

As described above, according to the present invention,
The process gas concentrated at a high magnification by the rotation of the rotor made of honeycomb activated carbon is supplied to the condensing means of the condensing and collecting section, and the cooling and thawing processes are alternately repeated by the cooler of the condensing means, so that the solvent concentrated gas becomes the solvent. Is recovered as a liquid, a high-quality solvent liquid can be recovered with high efficiency from a gas containing a solvent such as fluorocarbon which has a high boiling point and is easily thermally decomposed. Therefore, the present invention is extremely useful for recovering a solvent having a high boiling point and easily thermally decomposed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a solvent concentrating and collecting apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic view showing the refrigerant pipe.

FIG. 3 is a front view of a rotor 1.

[Explanation of symbols]

1; rotor 1a; adsorption zone 1b; cooling zone 1c; regeneration gas passage zone 2, 3; Condensing tower 4; Separator 30; Refrigerator 49; Condenser

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Takahara             Kanagawa Prefecture Fujisawa City Miyamae character Urakawachi 100-1 shares             Ceremony Company Kobe Steel Fujisawa Office

Claims (3)

[Claims] 1. A rotor made of a honeycomb molded body of activated carbon, a rotating means for rotating the rotor in one direction about its axis to move at least a processing zone, a regeneration zone and a cooling zone, and an external system. A processing gas supply means for passing a solvent-containing processing gas through the rotor of the processing zone to cause the solvent to be adsorbed by the rotor to discharge a clean gas, and a cooling means for introducing a cooling gas into the rotor of the cooling zone for cooling. Regeneration means for supplying a regeneration gas to the rotor in the regeneration zone, and a plurality of regenerated gases after regenerating the rotor are introduced to cool the regenerated gas to a temperature of 0 ° C. or lower to freeze or liquefy the contained solvent. Condensing means provided with a plurality of coolers and defrosting gas for defrosting the regenerated gas and the condensate in the cooler are selectively and alternately introduced into the cooler of the condensing means. And a liquid separation means for separating the solvent and water from the liquid thawed by the defrosting gas and discharged from the condensing means to collect the solvent. apparatus. 2. An automatic expansion valve for injecting and evaporating a liquid refrigerant into the cooler of the condensing means to cool the inside of the cooler by the heat of evaporation, and compressing the evaporated refrigerant discharged from the cooler. A refrigerating compressor, an evaporating pressure adjusting valve provided between the cooler and the refrigerating compressor, and a defrosting gas supply means for supplying the refrigerant obtained from the refrigerating compressor into the cooler as a defrosting gas. 2. The solvent concentrating and collecting apparatus according to claim 1, further comprising: a switching unit that alternately switches a flow of the refrigerant and a flow of the defrosting gas to the cooler. 3. The purge zone is further provided in the rotor between the regeneration zone and the cooling zone, and heated outside air is introduced into the purge zone. The solvent concentration and recovery device described.