JP2008142685A - Anesthetic gas-recovering device and anesthetic gas-recovering method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anesthetic gas-recovering device which is comparatively small in size and efficiently detoxifies, in a short time, a treatment-targeted gas which contains an anesthetic gas of high concentration which is used for killing small animals in an animal management center or the like and is emitted in a large quantity in batches from disposal devices. <P>SOLUTION: The anesthetic gas-recovering device (A) is an anesthetic gas-recovering device which recovers an anesthetic gas from a treatment-targeted gas which contains the anesthetic gas fed from disposal devices (1a, 1b, and 1c) which kill small animals. The anesthetic gas-recovering device (A) is provided with chambers (2 and 2a) which store the treatment-targeted gas sent from the disposal devices (1a, 1b and 1c), a condenser (3) which cools the treatment-targeted gas sent from the chambers (2 and 2a) to cool the anesthetic gas and liquidizes and recovers the anesthetic gas, a freezer (7) which produces a cooling liquid to be sent to the condenser (3), and an adsorption device (5) which adsorbs the anesthetic gas contained in the gas component after the treatment-targeted gas is treated in the condenser (3). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an anesthetic gas recovery apparatus and an anesthetic gas recovery method. More specifically, even in the case of gas to be treated including high-concentration anesthetic gas, which is used for killing small animals at animal management centers, etc., and is discharged in batches from a disposal device (killing room) in large quantities. The present invention relates to a device that can be detoxified efficiently and in a short time with a relatively small scale device.

Anesthetic gas (volatile anesthetic solution: isoflurane, sevoflurane, halocene, etc., most of which are used in combination with nitrous oxide) is used for humans in hospital surgery (concentration 2-5) %) And small animals that are killed at animal management centers (concentration 3 to 20%). Conventionally, the gas containing anesthetic gas used in each case has been released into the atmosphere without any treatment.
However, it is needless to say that anesthetic gas is toxic to living organisms, and furthermore, there is a concern about environmental impacts such as the global warming potential is extremely large, several tens of times that of carbon dioxide. Is detoxified or recovered, and the remaining treated gas (air) is released into the atmosphere.

  As an apparatus for detoxifying a gas containing an anesthetic gas, there is a surplus anesthetic gas processing apparatus described in Patent Document 1, for example. This surplus anesthetic gas treatment apparatus introduces a surplus anesthetic gas containing a volatile anesthetic and nitrous oxide into an adsorption cylinder filled with an adsorbent, so that the volatile anesthetic property contained in the surplus anesthetic gas is obtained. The liquid is adsorbed and removed, and then this gas is introduced into a catalyst layer filled with a nitrous oxide decomposition catalyst to decompose nitrous oxide into nitrogen and oxygen. Excess anesthetic gas containing gas and nitrous oxide can be treated.

JP 2002-172171 A

The above-described conventional surplus anesthetic gas treatment apparatus continuously treats surplus anesthetic gas discharged gradually from a hospital operating room, and is used for killing small animals, for example. There are the following problems in using the gas containing a large amount of anesthetic gas discharged from the disposal device every time in a batch as it is processed in a batch.
In other words, the anesthetic gas used for the killing of small animals is not necessarily only for the purpose of sleeping the small animals temporarily, but in some cases, killing with only anesthetic gas without using a suffocating gas such as carbon dioxide. In some cases, the concentration is higher than that used for humans as described above.

  Moreover, killing is performed about 4 to 5 times a day at each animal management center, and if the gas containing anesthetic gas is treated under these conditions, the gas containing the anesthetic gas is disposed of. It must be completely removed from the (killing room) and the anesthetic gas must be collected 4-5 times, the same as the number of kills. In other words, considering the workability of a series of operations required for each killing, the recovery of the anesthetic gas used each time the killing is performed is usually 15 minutes at a time, a short time of about 30 minutes at most. Will have to be done.

  However, the surplus anesthetic gas treatment apparatus has a structure in which the anesthetic gas is treated by adsorption with an adsorbent and decomposition by a catalyst, and the treatment of a relatively small amount of anesthetic gas with a low concentration is particularly limited in time. It is something that will be done soon. The structure in which an anesthetic gas is treated by adsorption with an adsorbent and decomposition by a catalyst is excellent in the recovery rate, but the treatment speed is slow. For this reason, in order for this device to have the ability to process a gas containing a high concentration and a large amount of anesthetic gas used for the killing of the above-mentioned small animals in a short time, a large and large-capacity device is required. Thus, not only the occupied space of the entire apparatus becomes large, but also enormous cost is required.

  Therefore, an object of the present invention is a gas to be treated containing high-concentration anesthetic gas which is used for killing small animals in animal management centers and the like and is discharged batchwise and in large quantities from a disposal device (killing room). Even if it exists, it is providing the anesthetic gas collection | recovery apparatus and the collection | recovery method of anesthetic gas which can be detoxified efficiently with a comparatively small scale apparatus in a short time.

Means taken by the present invention to solve the above problems are as follows.
The present invention is an apparatus for recovering anesthetic gas from a treated gas containing anesthetic gas sent from a disposal device for killing small animals,
An anesthesia comprising a storage means for storing the gas to be processed sent from the disposal device, and a condensing means for cooling the gas to be processed sent from the storage means to recover the anesthetic gas from the gas to be processed as a liquid. It is a property gas recovery device.

  The anesthetic gas recovery device of the present invention is more preferably provided with means for returning and circulating the remaining gas component in which the gas to be treated has been cooled by the condensing means to become a liquid.

  The anesthetic gas recovery apparatus of the present invention includes an adsorption means for adsorbing the anesthetic gas contained in the remaining gas component in which the gas to be treated is cooled by the condensing means to become a liquid. Is more preferable. .

The present invention is an apparatus for recovering anesthetic gas from a treated gas containing anesthetic gas sent from a disposal device for killing small animals,
A reservoir for storing the gas to be processed sent from the disposal device;
A condenser that cools the gas to be recovered from the gas to be processed sent from the reservoir as a liquid anesthetic gas;
A collection container for collecting the liquid condensed by the condenser;
A refrigerator for producing a coolant to be sent to the condenser;
An adsorber for adsorbing an anesthetic gas contained in a gas component after the gas to be treated is cooled by the condenser;
A heater for heating the gas component sent to the adsorber;
Means for taking out the anesthetic gas adsorbed by the adsorber and returning it to the reservoir;
An anesthetic gas recovery device.

The present invention is a method for recovering anesthetic gas from a treated gas containing anesthetic gas sent from a disposal device for killing small animals,
This is a method for recovering anesthetic gas, in which the gas to be treated sent from the disposal device is temporarily stored, the concentration of the anesthetic gas is averaged, and the gas to be treated is cooled to recover the anesthetic gas as a liquid.

The to-be-processed gas referred to in the claims and specification is a gas obtained by mixing a gas such as air or carbon dioxide and an anesthetic gas, and is in a recovery process before the recovery of the anesthetic gas. It means gas.
Examples of the anesthetic gas to be collected include isoflurane (1-chloro-2,2,2-trifluoroethyl difluoromethyl ether) and sevoflurane (fluoromethyl-2,2,2-trifluoro-1- (tri Fluoroether such as fluoromethyl) ethyl ether), enflurane (2-chloro-1,1,2-trifluoroethyl difluoromethyl ether), desflurane (1,2,2,2-tetrafluoroethyl difluoromethyl ether) However, it is not limited to these.

As the storage means (reservoir), for example, an atmospheric pressure type chamber may be used, but a pressure (compression) type chamber may also be used. Both chambers can also be used together. When a pressure type chamber is used, a large compressor is required to synchronize with the amount of exhaust gas from the disposal device.
Since the operating pressure of the disposal device is about atmospheric pressure and its fluctuation range is small, it is preferable to adopt a water-sealed chamber that is an atmospheric pressure type.

As the condensing means (condensing device), for example, a cooling liquid supplied from a refrigerator is circulated through a flow passage disposed in the heat exchange chamber, and the gas to be treated is circulated so as to touch the flow passage to perform heat exchange and cooling. The structure, or a structure in which chlorofluorocarbon or chlorofluorocarbon replacement gas or the like is circulated through a flow passage disposed in the heat exchange chamber and heat exchange is performed using latent heat to cool the structure, but is not limited thereto.
In addition, as the adsorbent for the adsorber, for example, activated carbon, zeolite, silica, mesoporous silica, alumina and the like can be suitably used, but are not limited thereto.

(Function)
The operation of the anesthetic gas recovery device according to the present invention will be described. Here, the constituent elements used in the description are assigned in correspondence with the reference numerals given to the respective parts in the embodiments described later. These reference numerals are the same as the reference numerals described in the claims of the claims. Similarly, it is only for the purpose of facilitating understanding of the contents, and the meaning of each component is not limited to the above-described parts.

When the animal management center finishes killing small animals in the disposal device (1a, 1b, 1c), the gas to be treated including anesthetic gas is exhausted from the disposal device (1a, 1b, 1c) by the exhaust blower (91). It is evacuated and sent to the reservoir (2,2a) of the anesthetic gas recovery device.
In the reservoir (2, 2a), the concentration of the anesthetic gas in the stored gas to be processed is averaged.
The gas to be treated is sent from the reservoir (2, 2a) to the condenser (3). In the condensing device (3), the gas to be treated is cooled using the cooling liquid produced by the refrigerator (7), and the anesthetic gas is condensed by lowering the saturated concentration of the anesthetic gas, and the liquid content is reduced. Obtained and separated from the gas to be treated.

  The gas to be treated is cooled by the condensing device (3), and the remaining gas that has become liquid anesthetic gas is sent to the adsorber (5). The gas component sent to the adsorber (5) is heated by the heater (96) in order to efficiently adsorb the anesthetic gas. In the adsorber (5), a trace amount of anesthetic gas remaining in the gas component is adsorbed by an adsorbent or the like. The adsorbed anesthetic gas is taken out from the adsorber (5) by suction or the like, returned to the reservoir (2, 2a), and similarly processed in the above flow.

  In addition, if the gas to be treated is cooled in the condenser (3) and the remaining anesthetic gas is returned to the disposal device (1d), a trace amount of anesthetic gas remains. By mixing the gas component with the gas to be processed in the disposal device (1d), it is possible to discharge the gas component that has not been sufficiently removed from the anesthetic gas that has been processed once in the condenser (3) to the atmosphere. Can contribute to the prevention of air pollution.

  The anesthetic gas recovery apparatus according to the present invention includes a condensing unit (condensing device) for cooling the processing gas sent from the storage unit (reservoir) in order to recover the anesthetic gas from the processing gas as a liquid. Compared with the conventional method in which anesthetic gas is treated by adsorption with an adsorbent and decomposition with a catalyst, rapid and efficient recovery is possible. Therefore, even a gas to be processed containing a high concentration of anesthetic gas that is used for slaughtering small animals and discharged from a disposal device in batches and in large quantities can be efficiently and quickly produced with a relatively small scale device. Can be detoxified.

  The present invention will be described in detail based on the embodiments shown in the drawings.

FIG. 1 is an explanatory view of a first embodiment of an anesthetic gas recovery device of the present invention,
FIG. 2 is a cross-sectional explanatory view of a condensing device constituting the anesthetic gas recovery device.

  As shown in FIG. 1, the anesthetic gas recovery apparatus A includes a water seal chamber 2, a pressure chamber 2a, a condenser 3, a recovery container 4, an adsorber 5, a cooling tower 6, a refrigerator 7, and a water heater, which are reservoirs. 8 is provided. The used anesthetic gas is sent to the anesthetic gas recovery device A from the disposal devices 1a, 1b, and 1c for killing small animals each time the killing is completed.

  The disposal devices 1a, 1b, and 1c communicate with the water seal chamber 2, and a compressor 91 is provided in the path between the water seal chamber 2 and the pressure chamber 2a. The water-sealed chamber 2 stores the gas to be processed at almost normal pressure. The pressure chamber 2a compresses and stores the gas to be processed. The concentration of the anesthetic gas can be averaged by temporarily storing the gas to be treated in the water-sealed chamber 2 and the pressure chamber 2a.

  A compressor 92 and coolers 93 and 94 are provided in the path between the pressure chamber 2 a and the condenser 3. The compressor 92 boosts the gas to be processed sent to the condensing device 3 to, for example, 0.5 to 0.7 MpaG (set to 0.6 MpaG in the present embodiment). The coolers 93 and 94 cool the gas to be processed sent to the condensing device 3 to a required temperature.

  The condensing device 3 has a heat exchange chamber 30 through which the gas to be treated flows, and a gas introduction part 31 for introducing the gas to be treated is provided at the lower part of the heat exchange chamber 30, and the processed gas component is provided at the upper part. A gas deriving unit 32 for deriving is provided. Further, a cooling pipe 33 extended from the refrigerator 7 is introduced into the heat exchange chamber 30 from the upper side, and the cooling pipe 33 is wound in a coil shape (a gap that allows ventilation is formed between the cooling pipes 33). The heat exchange chamber 30 is led out to the outside and returned to the refrigerator 7. A storage part 34 is provided in the lower part of the heat exchange chamber 30.

  In the condensing device 3, the cooling liquid cooled by the refrigerator 7 is circulated through the cooling pipe 33 to cool the gas to be processed to a required temperature (for example, −10 to 0 ° C.) in the heat exchange chamber 30. it can. Thereby, in the condensing apparatus 3, the anesthetic gas with an average concentration of 2 to 5% can be lowered to a saturation concentration of around 0.15% at a stretch, and the recovery rate of the anesthetic gas thereby becomes 95% or more. In addition, the inlet concentration of the condenser 3 is not restricted at all, and stable operation is possible.

The anesthetic gas (including water but naturally separated) captured by the condensing device 3 becomes an anesthetic liquid and accumulates at the bottom of the condensing device 3 and is collected in the recovery container 4 together with the anesthetic liquid recovered in the pressure chamber 2a. Moved.
In addition, the path | route which connects the cooling tower 6 to the refrigerator 7 is connected with the path | route which sends cold water to the said cooler 93 and returns.

  An automatic valve 95 and a heater 96 are provided in the path between the condenser device 3 and the adsorber 5. The automatic valve 95 detects and holds the pressure so that the pressure of the gas to be treated in the condensing device 3 is 0.5 to 0.7 MpaG. When the pressure exceeds the pressure, the automatic valve 95 sends the excess gas to the adsorber 5 in the subsequent process. It is like that. Further, warm water for heating the gas to be treated is sent from the water heater 8 to the heater 96 and the adsorber 5 so as to circulate.

  The adsorber 5 adsorbs the gas component containing the low-concentration (0.2% or less) anesthetic gas that has overflowed the pressure from the condenser 3 as described above to the limit (0.05% or less) with the adsorbent. And activated carbon is used as the adsorbent. Two adsorbers 5 are provided, and gas components are processed in parallel. The adsorber 5 is equivalent to a general PSA (Pressure Swing Adsorption) type gas generator that adsorbs and removes a specific gas from the gas, and therefore, detailed description of the structure is omitted. In addition, it can also be set as the structure which does not provide the adsorption machine 5, like the apparatus of Embodiment 2 mentioned later.

  Anesthetic gas has an extremely large global warming potential of several tens of times that of carbon dioxide, and it is desirable not to release it into the atmosphere even if it is in a very small amount. The gas component containing the anesthetic gas exceeding the pressure of 0.5 to 0.7 MpaG in the condenser 3 is preferentially adsorbed in the process of passing through the adsorber 5, and an extremely small amount (0.05% or less) of anesthesia is obtained. It is released into the atmosphere as a gas (air) containing sexual gas.

In order to increase the adsorption efficiency of the adsorber 5, a holding pressure (0.2 to 0.5 MpaG) is necessary, but the gas introduced into the adsorber 5 exceeds the pressure of 0.5 to 0.7 MpaG of the condenser 3. Therefore, no compressor or the like is required, and no power is required, so the pressure can be maintained by the control valve.
The anesthetic gas adsorbed by the adsorber 5 is sucked at a negative pressure by the compressor 97 or a vacuum pump, returned to the pressure chamber 2a, and circulated.
In addition, check valves (check valves: not shown) are provided at important points in the path through which the gas to be treated containing anesthetic gas or the gas after treatment passes, to prevent backflow of the gas to be treated. Yes.

(Function)
The operation of the anesthetic gas recovery apparatus A will be described.
(1) The to-be-processed gas containing the anesthetic gas in the disposal devices 1a, 1b, and 1c is extracted by the compressor 91 and sent to the water seal chamber 2 every time the disposal is completed in each disposal device. The concentration of the anesthetic gas discharged from the disposal devices 1a, 1b, and 1c varies in the range of about 20 to 0% (about 5 to 0% depending on the method).
In addition, it is preferable to suppress the pressure fluctuation of the disposal devices 1a, 1b, and 1c to a minimum (± 0.5 Kpa: ± 50 mmAq). Moreover, if it is going to process according to the normal exhaust time (about 4 to 7 minutes) from the disposal devices 1a, 1b, and 1c, the capacity of the compressor 92 and the condensing device 3 must be increased, resulting in cost and occupation. It creates problems in terms of space. Since the killing interval is about 30 minutes, the processing time can be adjusted to this, and the equipment can be made inexpensively as much as the capacity can be suppressed.

(2) The concentration of the gas to be processed temporarily stored in the water ring chamber 2 is averaged in the water ring chamber 2. The gas to be treated in the water ring chamber 2 is sent to the pressure chamber 2a by the compressor 91, compressed at a required pressure, and stored. Thereby, it is possible to store a relatively large amount of gas to be processed. In the pressure chamber 2a, anesthetic gas is partially recovered by condensation or the like.
(3) The gas to be processed in the pressure chamber 2a is sent to the condenser 3 side by the compressor 92. The gas to be processed is cooled to a predetermined temperature by the cooler 93 and the cooler 94 while being sent to the condenser 3 side.

(4) When the gas to be treated is introduced into the condensing device 3, the gas to be treated is cooled, the saturated concentration is lowered, the anesthetic gas contained in the gas to be treated at a required concentration is liquefied, and anesthesia is performed in the storage unit 34. It is recovered as a sex liquid. Then, the sufficiently cooled gas after the gas to be processed is processed is returned to the cooler 94 in the external introduction path and used for cooling the gas to be processed.

(5) The anesthetic liquid recovered by the condensing device 3 is recovered in the recovery container 4 together with the anesthetic liquid recovered in the pressure chamber 2a, and sent to the step of reusing the anesthetic liquid.
(6) Among the gas components exiting from the condenser 3 while being cooled by the condenser 3, for example, the part exceeding the pressure of 0.5 to 0.7 MpaG (pressure overflow) passes through the automatic valve 95 to the adsorber 5 side. Sent. In addition, the gas used for heat exchange in the cooler 94 in the step (4) is also sent to the automatic valve 95, and the amount exceeding the predetermined pressure is sent to the adsorber 5 side as described above.

(7) An extremely small amount of gas containing anesthetic gas, which is generated by processing the gas to be processed by the condenser 3, is heated to an appropriate temperature by which the anesthetic gas is adsorbed by the heater 96. And is sent to the adsorber 5. Hot water having a predetermined temperature is supplied from the water heater 8 to the adsorber 5 and the heater 96. Further, the hot water that has come out of the adsorber 5 and the heater 96 returns to the water heater 8 and circulates.

(8) Anesthetic gas contained in the gas component introduced into the adsorber 5 is adsorbed by the adsorbent of the adsorber 5. The anesthetic gas adsorbed by the adsorbent is taken out of the adsorbent by the negative pressure of the compressor 97, returned to the pressure chamber 2a, and finally rides on the circulation processing path passing through the condenser 3 and the adsorber 5. Is recovered.
(9) Since the gas remaining in the adsorption process of the adsorber 5 does not contain an anesthetic gas or contains only a very small amount, it is released into the atmosphere.

(10) The to-be-processed gas containing the anesthetic gas remaining in the apparatus after the anesthetic gas recovery apparatus A is stopped is returned to the pressure chamber 2a together with the gas in the condenser 3 and the gas in the adsorber 5. It is. This is set assuming that operation is not performed for several days in consideration of usage conditions such as facility holidays, and that anesthetic gas is released into the atmosphere due to leakage or misoperation during that time. In addition, the inside of the device is prevented from being deteriorated by an anesthetic gas that leads to a decrease in performance. That is, in the anesthetic gas recovery apparatus A, the gas released into the atmosphere is limited to that after the recovery of the anesthetic gas.

  The anesthetic gas recovery device A has an ability to recover 98% or more of the anesthetic gas discharged from the disposal devices 1a, 1b, and 1c, but was injected into the disposal devices 1a, 1b, and 1c. For all anesthetic gases, there is some remaining in the body and surface of killed small animals, so the recovery rate is about 85 ± 3%.

FIG. 3 is an explanatory diagram of a second embodiment of the anesthetic gas recovery apparatus of the present invention.
In addition, in this embodiment, in FIG. 3, the same code | symbol is attached | subjected and shown in the said anesthetic gas collection | recovery apparatus A, and the overlapping description about a structure is abbreviate | omitted fundamentally.

  The anesthetic gas recovery device B is different from the anesthetic gas recovery device A in the following points. That is, the adsorber 5 is not provided in the anesthetic gas recovery device B, and the gas after the anesthetic gas is removed from the gas to be treated by the condenser 3 is returned to the disposal device 1d. It is designed to be processed while circulating.

  As shown in FIG. 3, the gas to be processed discharged from the disposal device 1 d is sent to a cooler (heat exchanger) 94, cooled, and sent to the condensing device 3. Cooling liquid is sent from the refrigerator 7 to the condensing device 3. The anesthetic gas removed from the gas to be processed by the condenser 3 is collected in the collection container 4 via the separator 98.

  In addition, the sufficiently cooled gas component after the anesthetic gas is removed from the gas to be treated by the condenser 3 is sent to the cooler 94 via the separator 98 to cool the gas to be treated. Used. This gas component is further heated to an appropriate temperature by the recuperator 99 and returned to the disposal device 1d or released into the atmosphere. Switching between return and discharge can be performed by operating a valve, but release to the atmosphere is performed after the processing operation is completed.

  The anesthetic gas recovery device B can return the gas after the gas to be processed is processed by the condenser 3 as described above to the disposal device 1d, so that a small amount of anesthetic gas remains. By mixing the gas with the gas to be processed in the disposal device 1d, the gas component that has not yet been removed enough to remove the anesthetic gas that has been processed once in the condenser 3 is not discharged into the atmosphere. It can contribute to the prevention of air pollution.

  Note that the terms and expressions used in the present specification are merely explanatory and not restrictive, and do not exclude terms and expressions equivalent to the above terms and expressions. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the technical idea.

Explanatory drawing of 1st Embodiment of the anesthetic gas collection | recovery apparatus of this invention. Cross-sectional explanatory drawing of the condensing apparatus which comprises an anesthetic gas collection | recovery apparatus. Explanatory drawing of 2nd Embodiment of the anesthetic gas collection | recovery apparatus of this invention.

Explanation of symbols

A Anesthetic gas recovery device 2 Water-sealed chamber 2a Pressure chamber 3 Condensing device 30 Heat exchange chamber 31 Gas introduction part 32 Gas outlet part 33 Cooling pipe 34 Storage part 4 Collection container 5 Adsorber 6 Cooling tower 7 Refrigerating machine 8 Water heater 91 Blower 92 Compressor 93 Cooler 94 Cooler 95 Automatic valve 96 Heater 97 Compressor 1a, 1b, 1c Disposer B Anesthetic gas recovery device 98 Separator 99 Reheater

Claims (5)

An apparatus for recovering anesthetic gas from gas to be treated including anesthetic gas sent from a disposal device (1a, 1b, 1c, 1d) for killing small animals,
Storage means (2, 2a) for storing the gas to be treated sent from the disposal device (1a, 1b, 1c, 1d);
Condensing means (3) for cooling the treated gas sent from the storage means (2, 2a) to recover the anesthetic gas from the treated gas as a liquid,
With
Anesthetic gas recovery device.   The means (98) according to claim 1, further comprising means (98) for returning and circulating the remaining gas component in which the gas to be treated is cooled by the condensing means (3) to the disposal device (1d). Anesthetic gas recovery device.   The adsorption means (5) for adsorbing the anesthetic gas contained in the remaining gas component in which the gas to be treated is cooled by the condensation means (3) and becomes an anesthetic gas is provided. 2. The anesthetic gas recovery device according to 2. An apparatus for recovering anesthetic gas from gas to be treated including anesthetic gas sent from a disposal device (1a, 1b, 1c, 1d) for killing small animals,
A reservoir (2, 2a) for storing the gas to be treated sent from the disposal device (1a, 1b, 1c, 1d);
A condenser (3) for cooling the treated gas to recover the anesthetic gas as a liquid from the treated gas sent from the reservoir (2, 2a);
A collection container (4) for collecting the liquid condensed in the condenser (3);
A refrigerator (7) for producing a coolant to be sent to the condenser (3);
An adsorber (5) for adsorbing an anesthetic gas contained in the gas component after the gas to be treated is cooled by the condenser (3);
A heater (96) for heating the gas component sent to the adsorber (5);
Means for taking out the anesthetic gas adsorbed in the adsorber (5) and returning it to the reservoir (2, 2a);
With
Anesthetic gas recovery device. A method of recovering anesthetic gas from a gas to be treated including anesthetic gas sent from a disposal device for killing small animals,
The gas to be treated sent from the disposal device (1a, 1b, 1c, 1d) is temporarily stored, the concentration of the anesthetic gas is averaged, the gas to be treated is cooled and the anesthetic gas is recovered as a liquid,
An anesthetic gas recovery method.

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