JPH05123525A - Gas purifying method and apparatus therefor - Google Patents

Abstract

PURPOSE:To adsorb and remove the component to be removed in a gaseous mixture with high efficiency without generating trouble. CONSTITUTION:First and third water adsorbent beds 11, 13 are arranged before and behind a second adsorbent bed 12 for adsorbing carbon dioxide. In an adsorbing process, air in space is introduced into an adsorbing tower 10 from the first adsorbent bed 11 and purified air is discharged to the space from the third adsorbent bed 13. In a regeneration process, air outside the space is introduced into the adsorbing tower 10 from the third adsorbent bed 13 to be discharged to the outside of the space from the first adsorbent bed 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas purification method and apparatus for adsorbing and removing a removal target component in a mixed gas by using an adsorbent, and particularly to a semi-enclosed space in which a person such as a building or a vehicle is densely packed. The present invention relates to a method and device suitable for maintaining comfort by preventing an increase in the concentration of carbon dioxide and the like when the environment is protected.

[0002]

2. Description of the Related Art Generally, in a space crowded with people such as a building or a vehicle, if this space is closed, the concentration of undesirable components such as carbon dioxide will increase, and unpleasant odors such as cigarette odor will accumulate. Therefore, large-scale ventilation is required to avoid this. However, when such ventilation is performed, the gas in the space, which had been kept at an appropriate temperature by the air conditioning equipment, is replaced with the gas outside the space, so it is very difficult to return the temperature in the space to the appropriate temperature after ventilation. Of the air conditioning energy is consumed, which causes a disadvantage that the required amount of air conditioning energy increases. Also,
In order to avoid such inconvenience, a ventilation device having a heat exchange function has been put into practical use, but the heat exchange performed by this device is inefficient because the temperature difference is small.

Therefore, it is conceivable to use a conventionally known gas purification method as means for cleaning the gas in such a space. For example, an offensive odor in a mixed gas can be removed by using a filter such as activated carbon. Regarding carbon monoxide, this carbon monoxide is heated at room temperature using a copper oxide / manganese oxide catalyst or a noble metal catalyst. It can be removed by oxidizing it to carbon dioxide at. Also, carbon dioxide can be removed by absorbing it in an alkali such as amine or adsorbing it in zeolite or the like.

Of these, the adsorption method is simple in system,
It has various advantages such as good operability and economical efficiency when downsizing, and it is considered to be the main method including the combination with other methods.

[0005]

One of the most problematic points when considering the space environment is the increase in carbon dioxide concentration, and when applying the adsorption method to remove carbon dioxide, the problem is water vapor. Co-adsorption of. That is, a typical adsorbent that effectively adsorbs carbon dioxide of the order of ppm is zeolite, but since this zeolite is rich in water vapor adsorption,
When a mixed gas is simply passed through this zeolite, water is adsorbed at the inlet of the adsorbent packed bed. If this water is not sufficiently removed at the time of regeneration, water will gradually enter the carbon dioxide adsorbing portion and lose the carbon dioxide adsorbing activity. The heating regeneration method is effective for performing such sufficient regeneration of the adsorbent, but in the heating regeneration method, since adsorption / regeneration must be performed in a cycle of several hours, a large amount of adsorbent is filled. However, there is a disadvantage that the device becomes large and uneconomical.

Therefore, as shown in FIG. 3A, before adsorbing the carbon dioxide in the adsorbent-packed layer A, water is pre-adsorbed in the alumina-packed layer B, which is relatively easy to regenerate. Applying the method, and further applying the PSA method thereto is an effective means. This method has already been put to practical use in the pretreatment step of a deep-cooling air separation device (see, for example, Japan Oxygen Technical Report No. 7, pp3-10 (1988)). However, according to this method, when the adsorbent-packed bed A is regenerated, as shown in FIG. 3B, the direction opposite to the gas introduction direction at the time of adsorption (that is, from the side without the alumina B to the adsorbent-packed bed A). Since it is necessary to introduce a large amount of dry gas in the direction (toward), it is difficult to apply it to the purification of air in the space. That is, when this method is used, for example, in an air separation device, it is possible to effectively use the exhaust gas generated from the air separation device as the dry gas, but when applied to the purification of air in the space, As the dry gas, the product gas once obtained by the adsorption treatment must be used, which reduces the amount of effective product gas, and the product gas purified from the air in the space is discharged to the outside of the space due to regeneration. As a result, ventilation is substantially performed, which causes an inconvenience of increasing air conditioning energy. Moreover, the moisture in the space adsorbed by the alumina-filled bed B during adsorption is not reduced into the space during regeneration and is released to the outside of the space, so that the space gradually dries out and the space becomes comfortable. It will be difficult to maintain a proper humidity.

Incidentally, unlike the above zeolite,
Activated carbon is an adsorbent having low water adsorption (that is, a hydrophobic adsorbent), but this activated carbon has an extremely small amount of carbon dioxide adsorbed under a low partial pressure and is not suitable for removing carbon dioxide.

In view of such circumstances, it is an object of the present invention to provide a gas purification method and apparatus capable of adsorbing and removing a removal target component in a mixed gas with high efficiency without inconvenience.

[0009]

DISCLOSURE OF THE INVENTION The present invention provides a gas purification method in which a mixed gas is passed through an adsorbent to adsorb and remove the removal target component, and the mixed gas interferes with the adsorption of the removal target component. Adsorbing step for passing through a first adsorbent for selectively adsorbing and removing the adsorbent, a second adsorbent for selectively adsorbing and removing the removal target component, and a third adsorbent for selectively adsorbing and removing the interfering component And the regeneration step of passing the regeneration gas through the third adsorbent, the second adsorbent, and the first adsorbent in this order at a pressure equal to or lower than the pressure of the mixed gas in the adsorption step (claim) Item 1).

The present invention is also a gas purifying apparatus using the above method, wherein a first adsorbent for selectively adsorbing and removing an interfering component that interferes with the adsorption of the removal target component and the removal target component are selected. The adsorbing means in which a second adsorbent for selectively adsorbing and removing and a third adsorbent for selectively adsorbing and removing the interfering component are arranged in order, and a mixed gas in the space for the first adsorbent.
Adsorbent passage for introducing the adsorbent from the adsorbent side to the third adsorbent side and introducing the gas outside the space into the adsorbent means from the third adsorbent side. However, a regeneration passage for leading out from the first adsorbent side to the outside of the space is provided (Claim 3).

Although the removal target component and the interfering component are optional, it is particularly effective when the removal target component contains at least carbon dioxide and the interfering component contains at least water (claims 2 and 4).

[0012]

In the method according to claim 1, in the adsorption step,
First, by passing the mixed gas through the first adsorbent, it is possible to selectively adsorb and remove a component (interfering component) that interferes with the adsorption removal of the removal target component. In this state, the above gas is subjected to the second adsorption. By passing through the agent, the component to be removed can be favorably adsorbed and removed. Then, by passing this gas through the third adsorbent that has adsorbed the interfering components in the pre-regeneration step, the interfering components can be desorbed from the third adsorbent and the interfering components can be contained again in this gas. As a result, the purified gas can be taken out in a state where the concentration of the interfering component is almost the same as that before the treatment. Therefore, in this adsorption step, the adsorption amount of the interfering component in the first adsorbent gradually increases, and conversely, the adsorption amount of the interfering component in the third adsorbent gradually decreases.

During the adsorption process, the second
The adsorbent of No. 3 approaches a saturated state, and the concentration of the target removal component at the outlet of the third adsorbent gradually increases. Therefore, when the concentration reaches a predetermined value, or before reaching the predetermined value, the regeneration process is switched to.

In this regenerating step, first, the regenerating gas is passed through the third adsorbent, whereby the interfering components in the regenerating gas can be adsorbed and removed. Therefore, it is not necessary to use the product gas from which the interfering components have been removed in advance as the regeneration gas, and it is possible to pass the regeneration gas through the third adsorbent and then directly through the second adsorbent. Yes,
By passing the regeneration gas, the removal target component can be desorbed from the second adsorbent (that is, the second adsorbent is regenerated). Then, by passing the gas that has passed through the second adsorbent through the first adsorbent, the interfering components can be desorbed from the first adsorbent.

Specifically, in the apparatus according to the third aspect, in the adsorption step, the mixed gas in the space passes through the adsorption passage and sequentially passes through the first adsorbent, the second adsorbent, and the third adsorbent. As a result, the purified gas in which the target removal component is removed by the same action as described above and the interfering component concentration is kept substantially equal to the concentration before the treatment is returned to the space. Further, in the regeneration step, the mixed gas outside the space passes through the regeneration passage through the third adsorbent, the second adsorbent, and the first adsorbent in this order, so that the second adsorption is performed by the same action as above. The agent and the first adsorbent are regenerated, and the regeneration gas containing a large amount of the adsorption removal component and the interference component is discharged to the outside of the space.

In such a method and apparatus, the adsorption removal component is carbon dioxide,
When the interfering component is water, in the adsorption step,
Water in the mixed gas is adsorbed by the first adsorbent, carbon dioxide is adsorbed by the second adsorbent, and water is desorbed from the third adsorbent. Conversely, in the regeneration step, the third adsorbent is used. The water in the regeneration air is adsorbed by the adsorbent, the carbon dioxide is desorbed from the second adsorbent, and the water is desorbed from the first adsorbent.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

In the figure, W is a partition wall, and the partition wall W keeps the space in a semi-sealed state.
An adsorption tower 10 is provided in the space, and in the adsorption tower 10, a first adsorbent layer 11, a second adsorbent layer 12, and a third adsorbent layer 13 are arranged in this order. ..

The second adsorbent layer 12 selectively adsorbs carbon dioxide (a component to be removed) in the air, and specifically, it is preferably made of zeolite. This zeolite may be hydrophilic or hydrophobic, but the adsorption capacity decreases when water enters the adsorbent at the time of adsorption or regeneration, which will be described later. It is preferable to use type zeolite or mordenite type zeolite.

On the other hand, the first adsorbent layer 11 and the third adsorbent layer 11
The adsorbent layer 13 may be any layer that selectively adsorbs moisture (interfering components) in the air. However, the hydrophilic zeolite that is also used as the second adsorbent 12 has a large equilibrium moisture absorption capacity even when the relative humidity is low, and desorption due to a difference in water vapor partial pressure can hardly be expected.
It is unsuitable for use in Nos. 1 and 13, and specifically, an adsorbent such as activated alumina or silica gel whose equilibrium moisture absorption capacity greatly differs depending on the relative humidity is used for both adsorbent layers 1.
1 and 13 are suitable.

The adsorbent layers 11 to 13 may be filled in a state of being in contact with each other or may be filled in a state of being separated from each other.

The inlet side portion of the first adsorbent layer 11 in the adsorption tower 10 is connected to the space air introduction port 15 via an introduction passage (which constitutes an adsorption passage and a regeneration passage) 14. A valve 16, a blower 18, and a valve 20 are provided in the middle of the introduction passage 14 in order from the mixed air introduction port 15 side. Further, the outlet side portion of the third adsorbent layer 13 in the adsorption tower 10 is connected to a purified air exhaust port 21 in the space via an exhaust passage (constituting an adsorption passage) 19, and the exhaust is performed. A valve 23 is provided in the middle of the passage 19.

The partition wall W is provided with a regeneration air introduction port 22 opening to the outside of the space. The outside air intake port 22 is connected to the inlet side of the blower 18 via an introduction passage (which constitutes a regeneration passage) 24, and the introduction passage 24 is provided with a valve 26. The outlet side of the blower 14 is a bypass passage (which constitutes a regeneration passage) 2
It is connected to the outlet side of the third adsorbent layer 13 in the adsorption tower 10 via 8 and a valve 30 is provided in the middle of the bypass passage 28. Further, the inlet side of the first adsorbent layer 11 in the adsorption tower 10 is provided with an air discharge port 3 in the partition wall W via a discharge passage (which constitutes a regeneration passage) 34.
2 and is connected to the valve 3 in the middle of the discharge passage 34.
6 is provided.

Next, an air purification method performed in this apparatus, that is, a method for purifying air in the space will be described. This method is carried out by repeating the adsorption step shown in FIG. 1A and the regeneration step shown in FIG.

(A) Adsorption Step First, by opening only the valves 16, 20, 23 and closing the other valves to operate the blower 18, the air in the space is introduced from the air introduction port 15 in the space to the introduction passage 14. Through the inlet of the first adsorbent layer 11 in the adsorption tower 10. As a result, the above-mentioned air is transferred to the first adsorbent layer 11 and the second adsorbent layer 11.
The adsorbent layer 12 and the third adsorbent layer 13 are sequentially passed.

Here, when the air passes through the first adsorbent layer 11, the water vapor in the air (that is, the component that interferes with the adsorption removal of carbon dioxide) is adsorbed and removed by the first adsorbent layer 11. , The air becomes dry. Therefore, by passing this dry air through the second adsorbent layer 12,
The carbon dioxide in the air can be satisfactorily removed (that is, the air can be satisfactorily purified) by the adsorbent layer 12 of.

In this adsorption step, the third adsorbent layer 1
No. 3 is in a state in which water vapor is probably adsorbed in the regeneration process (details will be described later) performed before the adsorption process. Therefore, the second
When the air that has passed through the third adsorbent layer 12 further passes through the third adsorbent layer 13, moisture is desorbed from the third adsorbent layer 13 and the air is humidified, and the purified air is discharged through the exhaust passage. The purified air is discharged into the space from the purified air discharge port 21 through 19. As a result, the air in the space is purified without being dried while keeping the humidity substantially constant.

When such an adsorption step is continued, the amount of carbon dioxide adsorbed in the second adsorbent layer 12 increases, the second adsorbent layer 12 approaches the saturated state, and the carbon dioxide is discharged from the purified air outlet 21. The carbon dioxide concentration in the air increases. Therefore, when the concentration approaches a predetermined constant value or before reaching the constant value, the regeneration process shown in FIG. 1B is performed.

The timing of switching to the regeneration process may be determined based on the result of direct analysis of the carbon dioxide concentration, or when the elapsed time or the amount of treated air reaches a certain value. You may make it switch by.

(B) Regeneration Step In this regeneration step, only the valves 26, 30, 36 are opened and the other valves are closed to operate the blower 18,
The air outside the space is introduced from the regeneration air introduction port 22 to the introduction passage 2
It is introduced to the inlet side of the third adsorbent layer 13 in the adsorption tower 10 through 4, 14 and the bypass passage 28. As a result, the above-mentioned air is transferred to the third adsorbent layer 13 and the second adsorbent layer 1
2. It will pass through the first adsorbent layer 11 in order. Here, the pressure of the air outside the space is set to be equal to or lower than the pressure of the introduced air during the adsorption process.

In such a regeneration step, the third adsorbent layer 13 is in a dry state due to the desorption of water in the adsorption step, so that the third adsorbent layer 13 is separated from the outside air (that is, the space). When the regeneration air) passes through, this third
The water vapor in the air is adsorbed and removed by the adsorbent layer 13 and the air becomes dry. Moreover, the carbon dioxide concentration in the air outside the space is lower than the carbon dioxide concentration in the air in the adsorption process, and the pressure of the air outside the space is set to be equal to or lower than the pressure of the air in the space during the adsorption process. Because
A difference occurs between the partial pressures of carbon dioxide in both air, and due to this difference, when the dry air is passed through the second adsorbent layer 12, carbon dioxide is favorably desorbed from the second adsorbent layer 12 ( That is, the second adsorbent layer 12 is satisfactorily regenerated)
be able to.

Further, the first adsorbent layer 11 is in a state of containing a large amount of water vapor by the adsorption operation in the adsorption step. Therefore, when the air that has passed through the second adsorbent layer 12 further passes through the first adsorbent layer 11, moisture is desorbed from the first adsorbent layer 11 and the regeneration air is humidified. This regeneration air is discharged from the regeneration air discharge port 32 to the outside of the space through the discharge passage 34. By such a regeneration step, the first and second adsorbent layers 11 and 12 are respectively regenerated, and the adsorption step can be performed again.

As described above, according to this method and apparatus, the first adsorbent layer 11 for adsorbing water and the third adsorbent layer 13 for adsorbing water are provided before and after the second adsorbent layer 12 for adsorbing carbon dioxide. And the mixed gas and the regenerating gas are introduced from the first adsorbent layer 11 in the adsorption step and from the third adsorbent layer 13 in the regeneration step, respectively. It is possible to use the air that is not sufficiently dried outside the space) as the regeneration gas, which can improve the product gas recovery rate (that is, the purification efficiency). Also, in the adsorption process, the air in the space is returned to the space,
In the regeneration process, the air outside the space is returned to the outside of the space, so ventilation is not performed inside or outside the space, so that the loss of air conditioning energy can be suppressed. Moreover, since the gas that has passed through the second adsorbent layer 12 in the adsorption step is given the moisture adsorbed in the third adsorbent layer 13, there is no possibility that the space will gradually dry.

Next, a second embodiment will be described with reference to FIGS. 2 (a) and 2 (b).

Here, two adsorption towers 10A and 10B are provided, and these are used to perform continuous operation.
Specifically, the introduction passage 14 branches into two passages 14A and 14B on the downstream side of the adsorption blower 18a, and the passages 14A and 14B are respectively connected to the adsorption towers 10A and 10B.
14B is provided with valves 20A and 20B. And
The respective passages 14A, 14B are connected to the common discharge passage 34 via the passages 34A, 34B, respectively.
34B is provided with valves 36A and 36B.

The discharge passage 19 also has two passages 19A,
19B, each of which is connected to the adsorption towers 10A and 10B, and valves 23A and 23 are provided in the passages 19A and 19B.
B is provided. Then, the passages 19A and 19B are connected to the common introduction passage 2 via the passages 28A and 28B, respectively.
4 and the valves 30A, 30 are provided in the passages 24A, 24B, respectively.
B is provided. In the introduction passage 24, a regeneration blower 18b is provided separately from the adsorption blower 18a.

According to such a device, as shown in FIG. 2 (a), by opening the valves 20A, 23A, 30B, 36B and operating both the blowers 18a, 18b, the air in the space 14 At the same time as performing the adsorption step from 14A through the adsorption tower 10A, the air outside the space is passed through the passages 24 and 28B.
From the adsorption column 10B to the regeneration step,
On the contrary, as shown in FIG. 2B, the valves 20B, 23B, 3
By opening both 0A and 36A and operating both blowers 18a and 18b, the air in the space is passed from the passages 14 and 14B to the adsorption tower 10B to perform the adsorption step, and at the same time, the air outside the space is passed from the passages 24 and 28A to the adsorption tower. A regeneration process can be performed through 10A. This makes it possible to continuously process the air in the space. This effect is not limited to the two-column type, but can be obtained for a multi-column type including an apparatus having three or more adsorption columns.

The present invention is not limited to such an embodiment, and the following modes can be taken as an example.

(1) In the above embodiment, an example of removing carbon dioxide as a removal target component was shown, but the present invention is not limited to this, and interferes with the removal target component and the adsorption removal of the removal target component in the mixed gas. It is widely applicable when an interfering component is included. For example, if you want to remove offensive odor components such as ammonia and mercaptan from the air,
Activated carbon or the like may be used as the adsorbent, and activated alumina or the like may be used for the first and third adsorbents, which removes water that is harmful to the adsorption and removal of the malodorous components.

(2) Regarding the pressure in the adsorption step and the regeneration step, as in the general PSA method, the adsorption may be performed at a high pressure above atmospheric pressure and the regeneration may be performed at a low pressure below atmospheric pressure. However, both steps may be performed at the same pressure. Even if the pressure is fixed in this way, the carbon dioxide concentration of the air in the space introduced in the adsorption process is higher than the carbon dioxide concentration of the air in the space introduced in the regeneration process. Will make a difference,
This partial pressure difference enables reproduction based on the same principle as the PSA method. In this case, the carbon dioxide concentration of the purified gas cannot be reduced to a concentration equal to or lower than the concentration of carbon dioxide in the general atmosphere, but there is no problem in the case of environmental preservation. Further, by performing all the operations at atmospheric pressure in this manner, it becomes possible to use a blower instead of the compressor or the vacuum pump.

Furthermore, when the space is not always stationary but is a space that moves at a certain speed or more, such as a space in a transportation machine, the air for regeneration is introduced in the regeneration process, that is, outside the space. By introducing air from the front in the traveling direction, the air is adsorbed in the adsorption tower 10 without power.
It is possible to introduce in. In this case, in the single tower type device as shown in FIG. 1, the blower 18 is used in the regeneration process.
The operating time is 1 / of the total operating time
However, in the two-tower type apparatus as shown in FIG. 2, both blowers 18a and 18b are always operated, and the operating rate is improved accordingly.

(3) In each of the above embodiments, if an active carbon filter for deodorization is interposed between the first adsorbent layer 11 and the second adsorbent layer 12, this filter is always used in a dry state. It is possible and effective. Further, if a carbon monoxide removing catalyst is interposed between both adsorbent layers 11 and 12, this catalyst can be used in a dry state, and further carbon dioxide is removed in the next second adsorbent layer 12. It is effective because it can be done. When both the deodorizing activated carbon filter and the carbon monoxide removing catalyst are used, the order of them is not particularly limited, but the carbon monoxide removing catalyst may be provided between the deodorizing activated carbon filter and the second adsorbent layer 12. If it is arranged, the above-mentioned filter can remove the components that may become catalyst poisons from the air in advance, which is more effective.

Experimental Example The inventors of the present invention used an experimental device based on the same concept as in FIG.
A carbon dioxide removal experiment was conducted. However, instead of using the blower 18, a gas cylinder was introduced and the introduction passage 24 was omitted. That is, the air introduction port 1 in the space shown in FIG.
Connect one cylinder containing O ₂ 20% / N ₂ standard gas and two cylinders containing pure carbon dioxide gas to 5,
After connecting a mass flow controller to each, the standard gas and the pure carbon dioxide gas were mixed. here,
Regarding one of the two pure gas cylinders (first cylinder), the flow rate was adjusted so as to obtain a mixed gas with a carbon dioxide concentration of 2000 ppm by mixing with the standard gas, and the other cylinder (first cylinder) (2 cylinder), the flow rate is adjusted so as to obtain a mixed gas having a carbon dioxide concentration of 400 ppm by mixing with the standard gas described above, a standard gas cylinder and a first cylinder are used in the adsorption step, and a standard gas is used in the regeneration step. A gas cylinder and a second cylinder were used. Also,
In order to provide the mixed gas with appropriate humidity, the gas from the standard gas cylinder was bubbled in a water tank kept at 17 ° C. and then mixed with pure carbon dioxide gas.

Other test conditions are as follows. Adsorption temperature: 25 ° C. Relative humidity at the inlet of the adsorption tower: about 60% in both steps Adsorption tower inner diameter: 23.9 mm First adsorbent and third adsorbent: Activated alumina (Rhone Poulenc) First adsorbent Thickness of layer and third adsorbent layer: 6 cm Second adsorbent: Y-type zeolite (Kobe Steel Co., Ltd., Si / Al molar ratio 6.0) Thickness of second adsorbent layer: 8 cm Process time for one adsorption process and regeneration process: 3 for both processes
Minute gas flow rate: 15 Nl / min in both steps Under such conditions, the concentration of carbon dioxide in the air at the purified air outlet 21 was measured by gas chromatography, and the average outlet concentration during the experimental period was about 700 ppm. During that time, it was confirmed that the concentration did not change significantly. On the other hand, the carbon dioxide concentration required by the working environment standards is 1000 ppm or less. Therefore, it can be said that the present method and apparatus can maintain a suitable environment satisfying the conditions of the working environment standard.

[0045]

As described above, according to the present invention, the following effects can be obtained.

First, according to the method of claim 1, the first adsorbent and the third adsorbent for adsorbing the interfering components are arranged before and after the second adsorbent for adsorbing the component to be removed. Since the gas is introduced from the first adsorbent in the adsorption step and from the third adsorbent in the regeneration step, the non-product gas, that is, the interfering component is sufficiently removed in the regeneration step. It is possible to use a gas that has not been treated as a regenerating gas, which has the effect of improving the product gas recovery rate. Further, according to the apparatus of claim 3 using this method, the air in the space is returned to the space in the adsorption step, and the air in the space is returned to the outside in the regeneration step, thereby performing ventilation inside and outside the space. It is possible to perform gas purification without using air, which has the effect of suppressing the loss of air conditioning energy. Moreover, since the interfering components adsorbed by the third adsorbent are given to the gas that has passed through the second adsorbent in the adsorption step, there is no fear that the interfering component concentration in the space will gradually decrease.

Specifically, according to the method and apparatus of claims 2 and 4, the carbon dioxide concentration in the gas mixture can be adsorbed and removed efficiently and reliably without lowering the humidity of the gas mixture. It can greatly contribute to conservation.

[Brief description of drawings]

FIG. 1 (a) is a flow sheet showing a state in which an adsorption step is executed in a gas purification apparatus according to a first embodiment of the present invention,
(B) is a flow sheet showing a state in which the regeneration process is executed by the above apparatus.

FIGS. 2 (a) and 2 (b) are flow sheets showing a state in which an adsorption step and a regeneration step are alternately executed in a gas purification apparatus according to a second embodiment of the present invention.

3A is a flow sheet showing a state in an adsorption step when a conventional gas purification method is applied to purification of air in a space, and FIG. 3B is a flow sheet showing a state in a regeneration step.

[Explanation of symbols]

 10 Adsorption Tower 11 First Adsorbent Layer 12 Second Adsorbent Layer 13 Third Adsorbent Layer 14 Introduction Passage (Adsorption Passage and Regeneration Passage) 19 Discharge Passage (Adsorption Passage) 24 Passage (regeneration passage) 28 Bypass passage (regeneration passage) 34 Discharge passage (regeneration passage)

Claims (4)

[Claims] 1. A gas purification method of passing a mixed gas through an adsorbent to adsorb and remove the removal target component, wherein the mixed gas selectively removes an interfering component that interferes with the adsorption of the removal target component. An adsorbing step of passing through one adsorbent, a second adsorbent that selectively adsorbs and removes the removal target component, and a third adsorbent that selectively adsorbs and removes the interfering component, and an adsorbing regeneration gas. The third adsorbent, the second adsorbent, the first adsorbent at a pressure equal to or lower than the pressure of the mixed gas during the process
And a regeneration step of passing the adsorbent in order, and a gas purification method. 2. The gas purification method according to claim 1, wherein the removal target component contains at least carbon dioxide, and the interfering component contains at least water. 3. A gas purifying apparatus for adsorbing and removing a removal target component from a mixed gas in a predetermined space, the first purifying device selectively adsorbing and removing an interfering component that interferes with the adsorption of the removal target component. An adsorbing means in which an adsorbent and a second adsorbent that selectively adsorbs and removes the removal target component and a third adsorbent that selectively adsorbs and removes the interfering component are arranged in order;
An adsorbing passage for introducing the mixed gas in the space into the adsorbing means from the first adsorbent side and introducing it into the space from the third adsorbent side, and a gas outside the space for adsorbing gas Three
And a regeneration passage for introducing the adsorbent from the adsorbent side to the outside of the space from the first adsorbent side. 4. The gas purifying apparatus according to claim 3, wherein the removal target component contains at least carbon dioxide, and the interfering component contains at least water.