Polypropylene production with pressure swing adsorption tail gas recovery device

Abstract

The application discloses a polypropylene production variable pressure adsorption type tail gas recovery device and relates to the field of tail gas recovery. The device comprises an adsorption tube sleeve filtering adsorption bag, a treatment cylinder body, an adsorption cylinder, a detection chamber, a discharge valve, an infrared spectrometer, a variable pressure adsorption assembly, an annular pipe, a plurality of air pressure pipes, an air compressor, and a connection. The device sets two treatment processes. In the first process, the air compressor is set to adsorb propylene in mixed gas, and the imported mixed gas is gradually mixed and stirred to make the mixed gas fully contact with the adsorption block, thereby completing the absorption treatment of propylene in the mixed gas. The pressure is adjusted again to liquefy the adsorbed propylene, and the gas-liquid separation is set to separate the liquefied propylene and the mixed gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tail gas recovery, in particular to a polypropylene production variable pressure adsorption type tail gas recovery device. BACKGROUND

[0002] Polypropylene is a semi-crystalline thermoplastic polymer made from propylene monomer through polyaddition reaction, which can be used in industry and daily necessities, such as automobile parts and household appliance shells, and can also be used in food and medical treatment, such as food packaging containers, etc. Due to its universality, it can be found everywhere in production and manufacturing.

[0003] In the production and manufacturing of polypropylene, the tail gas generated mainly includes propylene monomer, propane, nitrogen and a small amount of non-methane total hydrocarbon. Among them, propylene accounts for a high proportion as unreacted raw material, and its recovery value is significant. In the recovery of tail gas generated in the production of polypropylene, the tail gas is first discharged from the tail of polypropylene generation, and then treated in two stages to recover and process nitrogen and propylene contained in the tail gas respectively. In the first stage, propylene is adsorbed and nitrogen is filtered out. In the second stage, the adsorbed propylene is liquefied to form liquid propylene, and then the gas mixed in the propylene is separated. However, in the recovery process, because the amount of mixed waste gas is large, when a large amount of mixed waste gas is discharged together, because in the adsorption of propylene, the processing chamber is first compressed to the adsorption pressure by a compressor, and in the compression process, propylene may not be completely absorbed, which easily leads to the discharge of propylene mixed in nitrogen. Therefore, we propose a polypropylene production variable pressure adsorption type tail gas recovery device. SUMMARY

[0004] The purpose of the present application is to provide a polypropylene production variable pressure adsorption type tail gas recovery device to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a polypropylene production variable pressure adsorption type tail gas recovery device, comprising an adsorption pipe sleeve, a filter adsorption bag is distributed in the adsorption pipe sleeve, one end of the adsorption pipe sleeve is provided with a first treatment assembly and a second treatment assembly in sequence, the first treatment assembly adsorbs propylene and discharges nitrogen, and the second treatment assembly liquefies propylene and discharges gas; the first treatment assembly comprises a treatment cylinder connected to one end of the adsorption pipe sleeve, an adsorption cylinder is arranged in the treatment cylinder, the adsorption cylinder is a conical cylinder, one end of the adsorption cylinder with a large inner wall diameter faces the adsorption pipe sleeve, and one end of the adsorption cylinder with a small inner wall diameter is provided with a detection chamber, a discharge valve is arranged on the detection chamber along the axis of the treatment cylinder, an infrared spectrometer is connected to the discharge valve, the discharge valve is communicated with the second treatment assembly, and a circulating recovery member is connected to the bottom of the detection chamber; a variable pressure adsorption assembly is arranged on the inner wall of the treatment cylinder, an annular pipe is arranged on the outer wall of the treatment cylinder, a plurality of air pressure pipes are arranged on the annular pipe, a plurality of air compressors are arranged on the treatment cylinder, and the air compressors are connected with the annular pipe.

[0006] Preferably, the processing cylinder is provided with an adsorption processing assembly, the adsorption processing assembly comprises an adsorption cover installed in the processing cylinder, the middle part of the adsorption cover is provided with a filter screen connected with the adsorption cylinder port, the adsorption cover is trumpet-shaped, and one side of the adsorption cover communicated with the adsorption pipe sleeve is provided with a plurality of adsorption grooves, and the back of the adsorption cover is provided with a folding recess, the back of the adsorption cover is provided with a folding pusher, and the air pressure pipe sprays gas to push the folding pusher to move, the adsorption pipe sleeve and the processing cylinder are connected with a recovery pipe, and the recovery pipe is provided with a recovery storage body for adsorbing impurities.

[0007] Preferably, the folding pusher comprises a plurality of elastic curved sheets installed outside the adsorption cylinder, a pulling rod is sleeved on the elastic curved sheet, the pulling rod is connected with the back of the adsorption cover, and the connection is an elastic contraction rod, a plurality of pulling rods are connected through a wind guide ring, and the wind guide ring is installed on the outer wall of the adsorption cylinder, and the air outlet of the air pressure pipe is directed to the plate surface of the elastic curved sheet.

[0008] Preferably, the wind guide ring is provided with a wind guide slope.

[0009] Preferably, the pressure swing adsorption assembly comprises a gas permeable membrane installed at the detection chamber, a plurality of absorption mounting bodies are connected at equal angles on the gas permeable membrane, a plurality of adsorption blocks loaded with NJ type copper-loaded adsorbents are arranged on the absorption mounting body, the absorption mounting bodies are distributed along the inner wall of the adsorption cylinder, and the plurality of mounting bodies and the gas permeable membrane form a conical cylinder.

[0010] Preferably, the rotating fan blade is installed on the rotating shaft, and a sliding area is formed on the rotating shaft, and a sliding fan blade is sleeved on the sliding area, and a plurality of air holes are formed on the blades of the sliding fan blade.

[0011] Preferably, one side of the detection chamber communicated with the gas permeable membrane is provided with a one-way air film, the one-way air film is made of high molecular material, has a microporous structure, and is provided with a protective grid, the detection chamber is in the shape of a sphere, and is provided with an inclined air deflector in the detection chamber, and a discharge valve is installed on the inclined air deflector.

[0012] Preferably, the circulating recovery member comprises a guide pipe connected to the bottom of the processing chamber, one end of the guide pipe is provided with a connecting pipe, two circulating pipes are arranged on the connecting pipe, and one end of the circulating pipe is provided with a mounting sleeve.

[0013] Preferably, the required second processing assembly comprises a processing tower, the middle part of the processing tower is provided with an air inlet pipe communicated with the detection chamber, the bottom of the processing tower is a condensation chamber, the bottom of the condensation chamber is connected with a collection pipe, the top of the processing tower is provided with a discharge pipe, and the processing tower is internally provided with a condensation screen.

[0014] Preferably, the condensation chamber is a conical cylinder, and a support frame is installed on the outside of the condensation chamber.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention employs a two-stage processing method. In the first stage, an air compressor is used to adjust the pressure, thereby adsorbing propylene from the mixed gas. A conical cylindrical structure is used to gradually mix and agitate the introduced mixed gas, ensuring sufficient contact between the mixed gas and the adsorption block, thus absorbing the propylene. In the second stage, the pressure is adjusted again to facilitate the liquefaction of the adsorbed propylene. Then, a gas-liquid separation mechanism separates the liquefied propylene from the mixed gas, purifying the propylene. This allows for the recovery of both propylene and nitrogen, improving recovery efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of a partial cross-section of the present invention;

[0019] Figure 3 This is a partial cross-sectional view of the second processing component of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the adsorption sleeve of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the first processing component of the present invention;

[0022] Figure 6 for Figure 5 A schematic diagram of the front structure;

[0023] Figure 7 for Figure 6 Schematic diagram of a partial cross-section of the middle adsorption cylinder;

[0024] Figure 8 This is a schematic diagram of the structure at the pressure swing adsorption component and the inclined air guide plate of the present invention;

[0025] Figure 9 A schematic diagram of the structure at the inclined air guide plate and protective grille;

[0026] Figure 10 This is a schematic diagram of the structure at the condensation mesh of the present invention;

[0027] Figure 11 This is a schematic diagram of the structure of the pressure swing adsorption (PSA) assembly.

[0028] Figure 12 for Figure 6The schematic diagram of the area amplification structure at middle A.

[0029] Figure: 1-adsorption tube cover; 2-first processing component; 3-second processing component; 4-detection chamber; 5-circulation recovery part; 6-pressure swing adsorption component; 7-annular tube; 8-adsorption processing component; 9-folding pushing part; 11-filtering adsorption bag; 12-recovery tube; 13-recovery storage body; 21-processing cylinder; 22-adsorption cylinder; 31-processing tower; 32-inlet tube; 33-condensation chamber; 34-discharge tube; 35-condensation net; 36-support frame; 37-collection tube; 41-discharge valve; 42-infrared spectrometer; 43-one-way air film; 44-protection grid; 45-inclined air deflector; 51-lead-out tube; 52-connection tube; 53-circulation tube; 54-mounting sleeve; 61-air permeable film; 62-absorption mounting body; 63-adsorption block; 64-rotation shaft; 65-rotation fan blade; 66-sliding area; 67-sliding fan blade; 71-air compressor tube; 72-air compressor; 81-adsorption cover; 82-filtering net; 83-adsorption groove; 84-folding recess; 91-elastic curved sheet; 92-pulling rod; 93-air guide ring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] Please refer to Figures 1-12 , the present application provides a technical solution: a pressure swing adsorption type tail gas recovery device for polypropylene production, to solve the problem of tail gas recovery treatment during polypropylene production. The solution includes an adsorption tube cover 1, as shown in the accompanying Figure 1 , the accompanying Figure 2 and the accompanying Figure 4 , the port position is a flange face disc for installation, a plurality of mounting holes are formed on it, the mounting surface of the adsorption tube cover 1 is installed at the tail end position of the polypropylene production equipment, and a filtering adsorption bag 11 is distributed in the adsorption tube cover 1. The filtering adsorption bag 11 is designed to be composed of a plurality of adsorption sheets, and the plurality of adsorption sheets form a complete ring. When the waste gas generated by polypropylene production passes through the middle circle position of the filtering adsorption bag 11, the waste gas is filtered. Thus, other impurities and waste gas mixed in the waste gas can be filtered, such as waste materials mixed in the waste gas.

[0032] In order to realize multi-filtering treatment in the polypropylene production process, a first processing component 2 and a second processing component 3 are sequentially arranged at one end of the adsorption tube cover 1, as shown in the accompanyingFigure 1 As shown in the figure, the first processing assembly 2 is used to adsorb propylene and release nitrogen, and the second processing assembly 3 is used to liquefy propylene exhaust gas;

[0033] The first processing assembly 2 comprises a processing cylinder 21 connected to one end of the adsorption pipe sleeve 1, and the processing cylinder 21 is internally provided with an adsorption cylinder 22, which is a conical cylinder. The adsorption cylinder 22 is as shown in the attached Figure 2 , the attached Figure 5 As shown in the figure, the end of the adsorption cylinder 22 with a large diameter of the inner wall faces the adsorption pipe sleeve 1, and the end of the adsorption cylinder 22 with a small diameter of the inner wall is provided with a detection chamber 4. In this way, the exhaust gas that has undergone preliminary filtration treatment is introduced from the end of the adsorption cylinder 22 with a large diameter, and as the pipe diameter gradually decreases, the introduced exhaust gas begins to converge to the middle position.

[0034] In order to further filter the exhaust gas that has undergone preliminary filtration treatment, an adsorption processing assembly 8 is arranged in the processing cylinder 21. The adsorption processing assembly 8 is as shown in the attached Figure 2 , the attached Figure 6 and the attached Figure 7 The adsorption processing assembly 8 comprises an adsorption cover 81 arranged in the processing cylinder 21. The adsorption cover 81 is in the shape of a horn, which is used to expand the storage space after the exhaust gas is introduced. The side of the adsorption cover 81 that is in communication with the adsorption pipe sleeve 1 is provided with a plurality of adsorption grooves 83, which are arc-shaped grooves arranged on the arc-shaped surface of the adsorption cover 81. When the exhaust gas is introduced and contacts the adsorption cover 81, it contacts the adsorption grooves 83, and the exhaust gas is blocked. In this way, the exhaust gas converges along the adsorption cover 81 to the axial position of the processing cylinder 21. The design of the adsorption grooves 83 slows down the rate of direct exhaust gas discharge, and also adsorbs the residual substances in the exhaust gas. The back surface of the adsorption cover 81 is provided with a folding recess 84. The middle part of the adsorption cover 81 is provided with a filter screen 82 connected to the port of the adsorption cylinder 22. After the exhaust gas is adsorbed and the discharge rate is slowed down, it is discharged from the filter screen 82 and enters the processing cylinder 21 for adsorption treatment.

[0035] The inner wall of the processing cylinder 21 is provided with a pressure swing adsorption assembly 6, and the outer wall of the processing cylinder 21 is provided with an annular pipe 7, and a plurality of air pressure pipes 71 are installed on the annular pipe 7, a plurality of air compressors 72 are installed on the processing cylinder 21, and the air compressors 72 are connected with the annular pipe 7. The pressure swing adsorption assembly 6 includes a gas permeable membrane 61 installed at the detection chamber 4, a plurality of adsorption mounting bodies 62 are connected at equal angles on the gas permeable membrane 61, and a plurality of adsorption blocks 63 loaded with NJ type copper-loaded adsorbents are arranged on the adsorption mounting body 62, the adsorption mounting body is distributed along the inner wall of the adsorption cylinder 22, and a plurality of mounting bodies and the gas permeable membrane 61 form a conical cylinder, a rotating shaft 64 is installed on the gas permeable membrane 61, and one end of the rotating shaft 64 is connected with a filter screen 82. A rotating fan blade 65 is installed on the rotating shaft 64, a sliding area 66 is formed on the rotating shaft 64, and a sliding fan blade 67 is sleeved on the sliding area 66, and a plurality of air holes are formed on the blades of the sliding fan blade 67.

[0036] When the exhaust gas passes through the filter screen 82, the rotating fan blade 65 is driven to rotate at this time, so that the entering exhaust gas forms flowing air in the conical sleeve formed by the plurality of adsorption mounting bodies 62, and the diameter of the conical sleeve formed by the adsorption mounting bodies 62 gradually decreases from large to small, so that the entering exhaust gas is diffused and converged to the center, and because the adsorption mounting body 62 is provided with a plurality of adsorption blocks 63 loaded with NJ type copper-loaded adsorbents, the propylene contained in the exhaust gas is easily adsorbed, and when the exhaust gas is first introduced, the air compressor 72 is set and adjusted, because the air pressure pipe 71 is connected at the adsorption cylinder 22, after the air compressor 72 is set, the air compressor 72 is used to extract and discharge gas, so that the pressure used by the first adsorption space formed in the adsorption cylinder 22 is 0.5-0.7Mpa, at this time, the propylene in the mixed gas is adsorbed to the adsorption block 63, and the nitrogen in the mixed gas passes through.

[0037] The detection chamber 4 is provided with a one-way air film 43 on the side where the detection chamber 4 is connected with the air-permeable film 61. The one-way air film 43 is made of a high polymer material and has a microporous structure. The one-way air film 43 is provided with a protective grid 44. The detection chamber 4 is in a spherical shape and is provided with an inclined air deflector 45. The discharge valve 41 is arranged on the inclined air deflector 45. The discharge valve 41 is arranged on the axis of the processing cylinder 21. The discharge valve 41 is connected with the infrared spectrometer 42. The discharge valve 41 is connected with the second processing assembly 3. The bottom of the detection chamber 4 is connected with a circulation recovery device 5. The circulation recovery device 5 includes a guide pipe 51 arranged at the bottom of the processing chamber. One end of the guide pipe 51 is provided with a connecting pipe 52. An electromagnetic air flow valve is arranged at the opening of the guide pipe 51. The electromagnetic air flow valve is a product available on the market. The electromagnetic air flow valve controls the flow of air according to the electromagnetic induction principle. The electromagnetic air flow valve is not described in detail because it is not the design point of the product.

[0038] When the infrared spectrometer 42 detects that there is no nitrogen gas in the mixed gas, the discharge valve 41 is opened. The electromagnetic air flow valve is arranged on the pipe wall. In the first stage, the nitrogen gas is recovered and utilized. In the second stage, the propylene is recovered. The air compressor 72 is set so that the pressure in the adsorption cylinder 22 is 10 KPa. The propylene is in a liquid state. The mixed gas passes through the air-permeable film 61 and the discharge valve 41 and enters the gas inlet pipe 31. The second processing assembly 3 includes the processing tower 31. The middle part of the processing tower 31 is provided with the gas inlet pipe 32 connected with the detection chamber 4. The bottom of the processing tower 31 is provided with the condensation chamber 33. The bottom of the condensation chamber 33 is connected with the collection pipe 37. The top of the processing tower 31 is provided with the discharge pipe 34. The processing tower 31 is provided with the condensation net 35.

[0039] The mixed liquid and gas enter the gas inlet pipe 32 and are separated. The liquid propylene is gathered in the condensation chamber 33 under the action of gravity. The upper part of the support frame 36 is provided with a condensation block. The liquid propylene gathered in the condensation chamber 33 is quickly condensed. The liquid propylene is collected at the bottom of the collection pipe 37. The mixed gas floats upward. When the mixed gas contacts the condensation net 35, the gas is condensed. The purification effect of the discharged gas is improved.

[0040] In order to facilitate the adsorption of impurities at the adsorption cover 81, a folding pusher 9 is arranged at the back of the adsorption cover 81, and the air pressure pipe 71 sprays gas to push the folding pusher 9 to move, the adsorption pipe sleeve 1 is connected with the recovery pipe 12 between the processing cylinder 21, and the recovery pipe 12 is provided with the recovery storage body 13 of the adsorption impurities. The folding pusher 9 comprises a plurality of elastic curved sheets 91 arranged outside the adsorption cylinder 22, the elastic curved sheets 91 are sleeved with pull rods 92, the pull rods 92 are connected with the back of the adsorption cover 81, the pull rods 92 are connected through the air guide ring 93, and the air guide ring 93 is arranged on the outer wall of the adsorption cylinder 22. The air outlet of the air pressure pipe 71 is directed to the plate surface of the elastic curved sheet 91. The air guide slope is arranged on the air guide ring 93.

[0041] When the air pressure machine 72 adjusts the pressure in the adsorption cylinder 22, because the adsorption cover 81 and the adsorption cylinder 22 constitute a whole, when the pressure in the adsorption cylinder 22 changes, the pressure in the whole space formed by the adsorption cover 81 and the adsorption cylinder 22 also changes, thereby the pull rod 92 arranged outside the adsorption cover 81 and the adsorption cylinder 22 can pull down the adsorption cover 81 to contract along the folding recess 84, thereby facilitating the change of the mixed gas adsorbed at the adsorption cover 81, and facilitating the dust in the mixed gas to be shaken off and recovered through the recovery pipe 12 and the recovery storage body 13. Because the pull rod 92 is sleeved on the elastic curved sheet 91, one end of the elastic curved sheet 91 is fixed on the outer wall of the adsorption cylinder 22, therefore after the pull rod 92 is pulled to a certain extent, the elastic curved sheet 91 is compressed, when the elastic force of the elastic curved sheet 91 is greater than the pulling force of the pull rod 92 caused by the pressure in the adsorption cylinder 22, at this time, the adsorption cover 81 can be slightly shaken, on one hand, the flow direction of the mixed gas flow is changed, on the other hand, the dust and sundries adsorbed are shaken off and recovered.

[0042] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, alternatives and variations to these embodiments could be made without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure swing adsorption (PSA) tail gas recovery device for polypropylene production, comprising an adsorption sleeve (1) and filter adsorption bags (11) distributed inside the adsorption sleeve (1), characterized in that: One end of the adsorption tube sleeve (1) is provided with a first processing component (2) and a second processing component (3) in sequence. The first processing component (2) adsorbs propylene and emits nitrogen gas, and the second processing component (3) liquefies propylene and emits gas. The first processing component (2) includes a processing cylinder (21) connected to one end of the adsorption tube sleeve (1). An adsorption cylinder (22) is provided inside the processing cylinder (21). The adsorption cylinder (22) is a conical cylinder. The end with the larger diameter of the inner wall of the adsorption cylinder (22) faces the adsorption tube sleeve (1), and a detection chamber (4) is installed at the end with the smaller diameter of the inner wall of the adsorption cylinder (22). A discharge valve (41) is installed in the detection chamber (4) along the axis of the processing cylinder (21), and an infrared spectrometer (42) is connected to the discharge valve (41). The discharge valve (41) is connected to the second processing component (3), and a recycling component (5) is connected to the bottom of the detection chamber (4). The inner wall of the treatment cylinder (21) is provided with a pressure swing adsorption assembly (6), and the outer wall of the treatment cylinder (21) is provided with an annular pipe (7), and multiple air compressor pipes (71) are installed on the annular pipe (7). Multiple air compressors (72) are installed on the treatment cylinder (21), and the air compressors (72) are connected to the annular pipe (7). The air compressor pipes (71) are connected to the adsorption cylinder (22). The processing cylinder (21) is provided with an adsorption processing component (8). The adsorption processing component (8) includes an adsorption hood (81) installed inside the processing cylinder (21). The middle part of the adsorption hood (81) is provided with a filter screen (82) connected to the port of the adsorption cylinder (22). The adsorption hood (81) is trumpet-shaped, and multiple adsorption grooves (83) are opened on the side of the adsorption hood (81) that communicates with the adsorption tube sleeve (1). A folding recess (84) is opened on the back of the adsorption hood (81). A folding pusher (9) is provided on the back of the adsorption hood (81). Gas is ejected from the air compressor pipe (71) to push the folding pusher (9) to move. A recovery pipe (12) is connected between the adsorption tube sleeve (1) and the processing cylinder (21). A recovery storage body (13) for adsorbing impurities is provided on the recovery pipe (12). The folding pusher (9) includes multiple elastic plates (91) installed on the outside of the adsorption cylinder (22). Pull rods (92) are sleeved on the elastic plates (91). The connection between the pull rod and the back of the adsorption cover (81) is an elastic retraction rod. The multiple pull rods (92) are connected by an air guide ring (93), and the air guide ring (93) is installed on the outer wall of the adsorption cylinder (22). The air nozzle of the air compressor pipe (71) faces the plate surface of the elastic plate (91).

2. The pressure swing adsorption tail gas recovery device for polypropylene production according to claim 1, characterized in that: The air guide ring (93) has an air guide slope.

3. The pressure swing adsorption tail gas recovery device for polypropylene production according to claim 1, characterized in that: The pressure swing adsorption assembly (6) includes a breathable membrane (61) installed in the detection chamber (4). Multiple absorbent mounting bodies (62) are connected at equal angles on the breathable membrane (61), and multiple adsorption blocks (63) loaded with NJ-type copper adsorbent are provided on the absorbent mounting bodies (62). The adsorption mounting bodies are distributed along the inner wall of the adsorption cylinder (22). The multiple mounting bodies and the breathable membrane (61) form a conical cylinder. A rotating shaft (64) is installed on the breathable membrane (61), and one end of the rotating shaft (64) is connected to the filter screen (82).

4. The pressure swing adsorption tail gas recovery device for polypropylene production according to claim 3, characterized in that: A rotating fan blade (65) is installed on the rotating shaft (64), and a sliding area (66) is provided on the rotating shaft (64), and a sliding fan blade (67) is fitted on the sliding area (66), with air holes provided on the blade of the sliding fan blade (67).

5. The pressure swing adsorption tail gas recovery device for polypropylene production according to claim 3, characterized in that: The detection chamber (4) is connected to the breathable membrane (61) on one side by a one-way air membrane (43). The one-way air membrane (43) is made of polymer material and has a microporous structure. A protective grid (44) is distributed on the one-way air membrane (43). The detection chamber (4) is spherical and is equipped with an inclined air guide plate (45). An exhaust valve (41) is installed on the inclined air guide plate (45).

6. The pressure swing adsorption tail gas recovery device for polypropylene production according to claim 1, characterized in that: The recycling component (5) includes an outlet pipe (51) connected to the bottom of the processing chamber, and a connecting pipe (52) is installed at one end of the outlet pipe (51), and two circulation pipes (53) are distributed on the connecting pipe (52), and an installation sleeve (54) is installed at one end of the circulation pipe (53).

7. The pressure swing adsorption tail gas recovery device for polypropylene production according to claim 1, characterized in that: The required second processing component (3) includes a processing tower (31), an air inlet pipe (32) connected to the detection chamber (4) is installed in the middle of the processing tower (31), the bottom of the processing tower (31) is a condensation chamber (33), and a collection pipe (37) is connected to the bottom of the condensation chamber (33), an exhaust pipe (34) is installed at the top of the processing tower (31), and a condensation mesh (35) is installed inside the processing tower (31).

8. The pressure swing adsorption tail gas recovery device for polypropylene production according to claim 7, characterized in that: The condensation chamber (33) is a conical cylinder, and a support frame (36) is installed on the outside of the condensation chamber (33).

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