A kind of separation and purification device and method of acrolein

Abstract

The present application provides a device and method for separating and purifying acrolein, and relates to the technical field of separating and purifying acrolein, comprising a reaction tower, a separation sleeve fixedly connected in the reaction tower, a connecting sleeve slidably connected in the separation sleeve, a filter plate fixedly connected on the inner side wall of the connecting sleeve, a packing baffle rotatably connected on the inner side wall of the separation sleeve, a plurality of connecting sleeves rotatably connected on the side of the filter plate close to the packing baffle, a connecting port for steam and acrolein aqueous solution to pass through is provided on the side wall of the connecting sleeve, a reinforcing rod is slidably connected in the connecting sleeve, a reinforcing plate is fixedly connected at one end of the reinforcing rod, a vent is provided on the reinforcing plate, and a baffle is slidably connected on the reinforcing rod. The present application can further separate and purify the acrolein aqueous solution, and can make the acrolein aqueous solution and steam fully contact and exchange heat.

Description

Technical Field

[0001] The present application relates to the technical field of separation and purification of acrolein, and in particular to a device and method for separation and purification of acrolein. Background Art

[0002] Acrolein is an organic compound, a colorless or light yellow liquid, soluble in water and easily soluble in most organic solvents such as ethanol and acetone. Its vapor is highly irritating and tear-inducing. It is a very important synthetic intermediate in the chemical industry and is widely used in resin production and organic synthesis.

[0003] When acrolein is prepared, the prepared acrolein aqueous solution needs to be distilled and purified through a distillation tower. The acrolein substance in the acrolein aqueous solution has a low boiling point, so that the acrolein aqueous solution and steam are mixed for heat exchange. After the mixing and heat exchange, the acrolein substance in the acrolein aqueous solution is driven to move upward, and the acrolein substance and steam are separated, thereby achieving the purpose of separation.

[0004] Referring to the Chinese patent document with publication number CN209348374U and titled as acrolein purification device, the device sprays acid washing solution or analytical solution through a spraying device, and facilitates the purification of acrolein and improves the purification effect of acrolein by setting a first packing layer, a baffle and a second packing layer, and prevents aggregates from blocking the air inlet by setting the pipe openings of the air inlet pipe and the exhaust pipe into an inverted "L" shape.

[0005] According to the above technical scheme, when separating and purifying acrolein, it is necessary to first mix acrolein and water. Due to cost constraints, there are more impurities in the mixed aqueous solution of acrolein and water. When the mixed aqueous solution passes through the packing layer, the impurities in the mixed aqueous solution block the filler gaps in the packing layer, causing partial blockage of the packing layer. Heat exchange between steam and the acrolein aqueous solution is required in the packing layer. In the process of heat exchange between acrolein and steam inside the packing, when the local water flow in the packing layer is large, it is difficult for steam to uniformly contact and exchange heat with the acrolein aqueous solution, which easily affects the overall heat exchange efficiency of acrolein and also causes the efficiency of the acrolein aqueous solution to slow down during separation and purification. Summary of the invention

[0006] In view of this, the present application provides a device and method for separating and purifying acrolein, aiming to solve the problem that when the water flow in the reaction tower is large, it is difficult for steam to fully contact and exchange heat with the acrolein aqueous solution.

[0007] In the first aspect, the present application provides a device for separating and purifying acrolein using the following technical solution:

[0008] The present application provides a device for separating and purifying acrolein, which adopts the following technical scheme, including a reaction tower, a liquid inlet and an air inlet provided on the side wall of the reaction tower, an air outlet provided on the top of the reaction tower and a condensing mechanism connected to the air outlet; a separation sleeve is fixedly connected in the reaction tower, a connecting sleeve is slidably connected in the separation sleeve, a filter plate for filtering impurities in an aqueous solution of acrolein is fixedly connected on the inner wall of the connecting sleeve, a packing baffle is rotatably connected on the inner wall of the separation sleeve, and the packing baffle is arranged below the filter plate, a plurality of connecting sleeves are rotatably provided on a side of the filter plate close to the packing baffle, and an opening is provided at one end of the connecting sleeve away from the filter plate, a connecting port for steam and aqueous solution of acrolein is provided on the side wall of the connecting sleeve, a reinforcing rod is slidably connected in the connecting sleeve, a reinforcing plate is fixedly connected at one end of the reinforcing rod close to the opening, a vent is provided on the reinforcing plate, a blocking plate for blocking the vent is slidably connected on the reinforcing rod, and a rotating mechanism for driving the packing baffle to rotate is provided on the reaction tower.

[0009] By adopting the above technical scheme, the problem of large impact force of the acrolein aqueous solution can be reduced, and the impact on the packing layer above the packing baffle can be reduced. In the process, the direct discharge of the acrolein aqueous solution can be reduced, so that the steam and the acrolein aqueous solution can be in more complete contact, thereby improving the heat exchange efficiency.

[0010] Optionally, a gas collecting plate is fixedly connected to the inner wall of the separation sleeve, and the gas collecting plate is arranged in a conical shape. A liquid flow port is opened at one end of the gas collecting plate close to the inner wall of the separation sleeve, and the liquid flow port is circumferentially distributed on the gas collecting plate. A reinforcing tube is fixedly connected to the axial position of the gas collecting plate, and a gas flow port is opened on the side wall of the reinforcing tube.

[0011] The reaction rate of the acrolein aqueous solution can be accelerated by introducing the gas in an orderly manner and then allowing the separated and purified acrolein aqueous solution to flow out through the liquid flow port.

[0012] Optionally, the rotating mechanism includes a rotating motor fixedly connected to the outer wall of the reaction tower, a connecting rod fixedly connected to the output shaft of the rotating motor, an end of the connecting rod away from the rotating motor is fixedly connected to a first bevel gear, a side of the filling baffle close to the gas collecting plate is fixedly connected to a rotating rod, the rotating rod penetrates the gas collecting plate, a second bevel gear is fixedly connected to the rotating rod, and the second bevel gear is meshed with the first bevel gear.

[0013] Optionally, a first sleeve is fixedly connected to the middle position of the filling baffle, and the first sleeve penetrates the filter plate, a second sleeve is provided on the filter plate, the second sleeve is arranged toward the filling baffle, and the second sleeve is sleeved on the outside of the first sleeve, a guide block is fixedly connected to the outer wall of the first sleeve, a guide groove is provided on the second sleeve, and the guide groove is arranged in a wave shape, an arc scraper is fixedly connected to the first sleeve, and the arc scraper is arranged above the filter plate, a storage bin is provided inside the first sleeve, and the storage bin is used to store impurities scraped to the middle position by the arc scraper.

[0014] By intermittently discharging steam to a position above the packing baffle, the fluidity of the acrolein aqueous solution can be improved, the probability of flow interruption can be reduced, and sufficient mixing and heat exchange between the steam and the acrolein aqueous solution can be ensured.

[0015] Optionally, one end of the filter plate close to the filling baffle is fixedly connected to a sliding track, and the sliding track is arranged in a circular shape, a sliding ring is slidably connected to the sliding track, the sliding ring and the reinforcing rod are rotatably connected, and one end of the reinforcing rod close to the sliding ring is fixedly connected to a rotating gear, a rotating rack is provided on the inner side wall of the sliding track, a sealing ring is slidably connected to the outer side wall of the sliding track, the sealing ring and the reinforcing rod are rotatably connected, and a stirring plate is fixedly connected to the outer side wall of the connecting sleeve for driving the filling material above the filling baffle to move.

[0016] By driving the packing material above the packing baffle to move, the acrolein aqueous solution can wet the surface of the packing material more quickly and evenly, thereby improving the heat exchange efficiency. In addition, by driving the packing material to move, the packing in the flow dead zone can be moved. By moving the packing material, the existence of the flow dead zone can be reduced, so that the fluid can flow and exchange heat better.

[0017] Optionally, a sliding groove is provided on the separating sleeve, a sliding block is fixedly connected to the connecting sleeve, and the sliding block is clamped in the sliding groove.

[0018] Optionally, one end of the liquid inlet extending into the reaction tower is fixedly connected with a distribution pipe.

[0019] In a second aspect, the present application provides a method for separating and purifying acrolein, wherein the separation and purification method is:

[0020] S1, introducing the acrolein aqueous solution into the reaction tower, introducing steam into the air inlet, the steam moves toward the reinforcing cylinder, and moves to the middle position between the packing baffle and the gas collecting plate through the gas flow port, the acrolein aqueous solution moves to the filter plate through the distribution pipe, and moves downward after being filtered by the filter plate;

[0021] S2, start the rotating motor, the rotating motor drives the connecting rod to rotate, and drives the filler baffle to rotate under the conduction of the connecting rod, the rotation of the filler baffle drives the first sleeve and the arc scraper to rotate, so that the arc scraper collects the impurities above the filter plate and moves them to the storage bin, and the first sleeve drives the guide block to rotate during the rotation process, so that the second sleeve moves up and down to a certain extent;

[0022] S3, the steam flows to the opening on the connecting sleeve, and the baffle plate blocks the vent during the upward movement of the second sleeve. After the second sleeve moves to the top, it moves downward. At this time, there is more steam under the reinforcing plate, which pushes the baffle plate to move upward, so that the gas moves to one end of the connecting sleeve close to the filter plate, and moves through the connecting port to the middle position of the filter plate and the packing baffle, so that the acrolein aqueous solution is mixed with the steam, and moved from the outlet to the condensation mechanism driven by the steam to purify the acrolein.

[0023] By reducing the direct discharge of the acrolein aqueous solution, the contact time between the steam and the acrolein aqueous solution is increased, and the contact between the acrolein aqueous solution and the steam is more complete, thereby improving the heat exchange efficiency and increasing the residence time of the steam in the packing layer.

[0024] Optionally, in step S2, when the first sleeve and the packing baffle rotate, the connecting sleeve located on the packing baffle is driven to rotate, and in the process, the packing material is driven to move, so that the packing material is fully mixed with the acrolein aqueous solution and steam; in step S3, after partial purification of acrolein, the remaining acrolein aqueous solution is re-introduced into the connection between the liquid inlet and the distribution pipe through the connection between the bottom of the condensation mechanism and the reaction tower for separation and purification again.

[0025] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0026] 1. It can reduce the problem of large impact force of acrolein aqueous solution on the packing layer above the packing baffle, and in the process can reduce the direct discharge of acrolein aqueous solution, so that steam and acrolein aqueous solution can be more fully in contact, thereby improving heat exchange efficiency.

[0027] 2. By reducing the direct discharge of the acrolein aqueous solution, the contact time between the steam and the acrolein aqueous solution is increased, and the contact between the acrolein aqueous solution and the steam is more complete, thereby improving the heat exchange efficiency and increasing the residence time of the steam in the packing layer.

[0028] 3. By driving the packing material above the packing baffle to move, the acrolein aqueous solution can wet the surface of the packing material more quickly and evenly, thereby improving the heat exchange efficiency. In addition, by driving the packing material to move, the packing in the flow dead zone can be moved. By moving the packing material, the existence of the flow dead zone can be reduced, so that the fluid can flow and exchange heat better. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a device for separating and purifying acrolein in this embodiment;

[0030] Figure 2 This is a schematic structural diagram of the separation sleeve of this embodiment;

[0031] Figure 3 This is a schematic diagram of the structure of the separation sleeve and the connecting sleeve of this embodiment;

[0032] Figure 4 It is a structural schematic diagram of the connecting sleeve of this embodiment;

[0033] Figure 5 Schematic diagram of the structure of the filter plate and the filler baffle in this embodiment;

[0034] Figure 6 This is a schematic diagram of the structure of the first sleeve and the second sleeve of this embodiment;

[0035] Figure 7 For this embodiment Figure 6 A partial enlarged view of the middle area A;

[0036] Figure 8 Schematic diagram of the structure of the guide groove of this embodiment.

[0037] Description of the reference numerals: 1, reaction tower; 11, liquid inlet; 12, air inlet; 13, air outlet; 2, condensation mechanism; 3, separation sleeve; 31, connecting sleeve; 32, filter plate; 33, packing baffle; 34, connecting sleeve; 35, connecting port; 36, reinforcing rod; 37, reinforcing plate; 38, vent; 39, baffle plate; 4, rotating mechanism; 41, rotating motor; 42, connecting rod; 43, first bevel gear; 44, rotating Moving rod; 45, second bevel gear; 5, gas collecting plate; 51, liquid flow port; 52, reinforcing cylinder; 53, gas flow port; 6, first sleeve; 61, second sleeve; 62, guide block; 63, guide groove; 64, arc scraper; 65, storage bin; 7, sliding track; 71, sliding ring; 72, rotating gear; 73, rotating rack; 74, sealing ring; 75, stirring plate; 8, sliding groove; 81, sliding block; 9, material distribution pipe. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application. Figure 1-Figure 8 , the technical scheme of the embodiment of the present application is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0039] like Figure 1 As shown, this embodiment provides a device for separating and purifying acrolein, including a reaction tower 1, a heat exchange mechanism, a rotating mechanism 4 and a cleaning mechanism. A liquid inlet 11 and an air inlet 12 are provided on the side wall of the reaction tower 1. An aqueous acrolein solution is introduced into the liquid inlet 11, and steam is introduced into the air inlet 12. The steam moves upward in the reaction tower 1 and moves to the heat exchange mechanism. The aqueous acrolein solution moves downward under the action of gravity and moves to the heat exchange mechanism. The aqueous acrolein solution and the steam exchange heat in the heat exchange mechanism. The rotating mechanism 4 drives the components in the heat exchange mechanism to rotate, so that the contact efficiency between the aqueous acrolein solution and the steam is enhanced. The aqueous acrolein solution needs to enter the cleaning mechanism before entering the heat exchange mechanism, and the impurities in the aqueous acrolein solution are filtered and collected after passing through the cleaning mechanism.

[0040] like Figure 2 , Figure 3 and Figure 8 As shown, a separation sleeve 3 is fixedly connected to the reaction tower 1, a sliding groove 8 is provided on the separation sleeve 3, a connecting sleeve 31 is slidably connected to the separation sleeve 3, a sliding block 81 is fixedly connected to the connecting sleeve 31, and the sliding block 81 is slidably connected to the sliding groove 8. When the connecting sleeve 31 moves upward, the sliding block 81 moves upward in the sliding groove 8.

[0041] like Figure 5 As shown, the rotating mechanism 4 includes a rotating motor 41, a connecting rod 42, a first bevel gear 43, a rotating rod 44 and a second bevel gear 45. The rotating motor 41 is fixedly connected to the outer wall of the reaction tower 1, and the output shaft of the rotating motor 41 extends into the interior of the reaction tower 1. The connecting rod 42 is fixedly connected to the output shaft of the rotating motor 41. One end of the connecting rod 42 away from the rotating motor 41 is fixedly connected to the first bevel gear 43, the first bevel gear 43 is meshed with the second bevel gear 45, and the rotating rod 44 is fixedly connected to the second bevel gear 45.

[0042] like Figure 3 and Figure 4As shown, the heat exchange mechanism includes a filter plate 32, a packing baffle 33, a connecting sleeve 34, a reinforcing rod 36, a reinforcing plate 37, a baffle plate 39 and an agitating plate 75. The filter plate 32 is fixedly connected to the connecting sleeve 31 and is arranged at the inner side wall of the connecting sleeve 31. The filter plate 32 is used to filter impurities in the acrolein aqueous solution. The packing baffle 33 is rotatably connected to the separating sleeve 3 and is arranged at a position below the filter plate 32. The packing baffle 33 and the rotating rod 44 are fixedly connected. The middle position between the packing baffle 33 and the filter plate 32 is filled with a packing material, and the packing material is used to fully mix the acrolein aqueous solution and the steam. The connecting sleeve 34 rotates It is connected to the packing baffle 33, and a plurality of connecting sleeves 34 are provided, a plurality of reinforcing rods 36 are provided, and a single reinforcing rod 36 is slidably connected to a single connecting sleeve 34, an opening is provided at one end of the connecting sleeve 34, a reinforcing plate 37 is fixedly connected to the reinforcing rod 36, a vent 38 is provided on the reinforcing plate 37, a baffle plate 39 is slidably connected to the reinforcing rod 36, and the baffle plate 39 is used to block the vent 38 on the reinforcing plate 37, a connecting port 35 for steam and acrolein aqueous solution to pass through is provided on the side wall of the connecting sleeve 34, and a stirring plate 75 is fixedly connected to the outer wall of the connecting sleeve 34 to drive the filling material to move.

[0043] The acrolein aqueous solution is filtered through the filter plate 32 and enters the position above the filling baffle 33, and moves into the filling material. The filling baffle 33 is driven by the rotating rod 44 to rotate so that the material above the filling baffle 33 can be fully contacted. During the rotation, the stirring plate 75 moves the filling material. The filter plate 32 moves up and down following the movement of the connecting sleeve 34, and drives the reinforcing rod 36 to move up and down. During the upward movement of the reinforcing rod 36, the blocking plate 39 blocks the vent 38 on the reinforcing plate 37, and during the downward movement of the reinforcing rod 36, the blocking plate 39 closes the blockage of the vent 38. The gas enters the inner wall of the connecting sleeve 34 through the vent 38, and enters the filling material through the connecting port 35 to fully contact with the acrolein aqueous solution.

[0044] like Figure 5 and Figure 6 As shown, the cleaning mechanism includes a first sleeve 6, an arc scraper 64 and a storage bin 65. The first sleeve 6 is fixedly connected to the middle position of the filler baffle 33, and the first sleeve 6 penetrates the filter plate 32. The arc scraper 64 is fixedly connected to the first sleeve 6 and is arranged above the filter plate 32. The arc scraper 64 is arranged in a spiral shape and is used to collect impurities remaining above the filter plate 32 and move them to the center. The storage bin 65 is opened in the first sleeve 6, and the storage bin 65 is used to store impurities remaining above the filter plate 32.

[0045] like Figure 5, Figure 6 and Figure 8 As shown, the filter plate 32 is fixedly connected with a second sleeve 61, which is arranged toward one end of the packing baffle 33 and sleeved on the outside of the first sleeve 6. A guide block 62 is fixedly connected to the outer wall of the first sleeve 6, and a guide groove 63 is provided on the inner wall of the second sleeve 61, and the guide groove 63 is arranged in a wave shape, and the guide block 62 is slidably connected in the guide groove 63. During the rotation of the first sleeve 6, the guide block 62 moves and pushes the second sleeve 61 to move up and down, and during the up and down movement of the second sleeve 61, the filter plate 32 and the connecting sleeve 31 are driven to move up and down.

[0046] like Figure 3 and Figure 5 As shown, a gas collecting plate 5 is fixedly connected to the inner side wall of the separation sleeve 3, and the gas collecting plate 5 is arranged in a bamboo hat shape. A liquid flow port 51 is provided at one end of the gas collecting plate 5 close to the inner side wall of the separation sleeve 3, and the liquid flow ports 51 are circumferentially distributed on the gas collecting plate 5. A reinforcing cylinder 52 is fixedly connected to the axial position of the gas collecting plate 5, and a gas flow port 53 is provided on the side wall of the reinforcing cylinder 52. A stirring blade is fixedly connected to the side of the rotating rod 44 close to the packing baffle 33. Through the arrangement of the machine plate, the gas is collected from the reinforcing cylinder 52, and the stirring blade is driven to rotate by the rotation of the rotating rod 44, so that the gas further passes through the gas flow port 53 and moves to the position above the gas collecting plate 5 and below the packing baffle 33.

[0047] like Figure 3 and Figure 7 As shown, one end of the filter plate 32 close to the filler baffle 33 is fixedly connected to a sliding track 7, and the sliding track 7 is arranged in a circular shape. A sliding ring 71 is slidably connected in the sliding track 7, and the sliding ring 71 is rotatably connected to the reinforcing rod 36. One end of the reinforcing rod 36 close to the sliding ring 71 is fixedly connected to a rotating gear 72. A rotating rack 73 is provided on the inner side wall of the sliding track 7, and a sealing ring 74 is slidably connected to the outer side wall of the sliding track 7, and the sealing ring 74 is rotatably connected to the reinforcing rod 36.

[0048] In the present application, an aqueous acrolein solution is introduced into the reaction tower 1 through the liquid inlet 11, and steam is introduced into the air inlet 12. The steam moves toward the reinforcing cylinder 52 through the gas collecting plate 5, and moves to the middle position between the packing baffle 33 and the gas collecting plate 5 through the gas flow port 53. The aqueous acrolein solution moves to the filter plate 32 through the distribution pipe 9, and moves downward after being filtered by the filter plate 32.

[0049] Start the rotating motor 41, which drives the connecting rod 42 to rotate, and drives the filling baffle 33 to rotate under the conduction of the connecting rod 42. The rotation of the filling baffle 33 drives the first sleeve 6 and the arc scraper 64 to rotate, so that the arc scraper 64 collects impurities above the filter plate 32 and moves them to the storage bin 65. During the rotation of the first sleeve 6, it drives the guide block 62 to rotate, so that the second sleeve 61 moves up and down to a certain extent.

[0050] The steam flows to the opening on the connecting sleeve 34, and the baffle plate 39 blocks the vent 38 during the upward movement of the second sleeve 61. After the second sleeve 61 moves up to the top, it moves down. At this time, there is more steam under the reinforcing plate 37, which pushes the baffle plate 39 to move up, causing the gas to move to one end of the connecting sleeve 34 close to the filter plate 32, and move through the connecting port 35 to the middle position between the filter plate 32 and the packing baffle 33, so that the acrolein aqueous solution is mixed with the steam, and driven by the steam, it moves from the gas outlet 13 to the condensation mechanism 2 to purify the acrolein.

[0051] When the first sleeve 6 and the packing baffle 33 rotate, the connecting sleeve 34 on the packing baffle 33 is driven to rotate, and in this process, the packing material is driven to move, so that the packing material is fully mixed with the acrolein aqueous solution and the steam.

[0052] After a part of purification, the remaining acrolein aqueous solution is reintroduced into the connection between the liquid inlet 11 and the distribution pipe 9 through the connection between the lower part of the condensation mechanism 2 and the reaction tower 1 for separation and purification again.

[0053] In the present embodiment, when the impact force of the aqueous acrolein solution is relatively large, the baffle plate 39 blocks the vent 38 on the reinforcing plate 37, so that the gas is gathered under the reinforcing rod 36. In the process, the direct discharge of the aqueous acrolein solution can be reduced, so that the contact between the steam and the aqueous acrolein solution is more complete, thereby improving the heat exchange efficiency, increasing the residence time of the steam in the packing layer, and improving the contact efficiency between the steam and the aqueous acrolein solution. In addition, the flow characteristics of the aqueous acrolein solution above the packing baffle 33 can be improved through segmented entry, reducing the probability of flow interruption, and ensuring that the steam and the aqueous acrolein solution can be fully mixed and heat exchanged.

[0054] In this embodiment, by driving the packing material above the packing baffle 33 to move, the acrolein aqueous solution can wet the packing surface more evenly, thereby improving the heat exchange efficiency, and by driving the packing to move, the packing in the flow dead zone can be moved, and by moving the packing material, the existence of the flow dead zone can be reduced, so that the fluid can flow and exchange heat better.

[0055] In this embodiment, by cleaning the filter plate 32, solid particles clogging the filter holes can be removed, keeping the filter holes unobstructed, thereby improving the filtration speed and efficiency. At the same time, through regular cleaning, the downtime for cleaning caused by reduced filtration efficiency can be reduced, thereby improving production continuity.

[0056] The implementation principle of an acrolein separation and purification device in the embodiment of the present application is as follows: an aqueous acrolein solution is introduced into the reaction tower 1 through the liquid inlet 11, and steam is introduced into the air inlet 12, the steam moves toward the reinforcing cylinder 52 through the gas collecting plate 5, and moves to the middle position between the packing baffle 33 and the gas collecting plate 5 through the gas flow port 53, the aqueous acrolein solution moves to the filter plate 32 through the distribution pipe 9, and moves downward after being filtered by the filter plate 32.

[0057] Start the rotating motor 41, which drives the connecting rod 42 to rotate, and drives the filling baffle 33 to rotate under the conduction of the connecting rod 42. The rotation of the filling baffle 33 drives the first sleeve 6 and the arc scraper 64 to rotate, so that the arc scraper 64 collects impurities above the filter plate 32 and moves them to the storage bin 65. During the rotation of the first sleeve 6, it drives the guide block 62 to rotate, so that the second sleeve 61 moves up and down to a certain extent.

[0058] The steam flows to the opening on the connecting sleeve 34, and the baffle plate 39 blocks the vent 38 during the upward movement of the second sleeve 61. After the second sleeve 61 moves up to the top, it moves down. At this time, there is more steam under the reinforcing plate 37, which pushes the baffle plate 39 to move up, causing the gas to move to one end of the connecting sleeve 34 close to the filter plate 32, and move through the connecting port 35 to the middle position between the filter plate 32 and the packing baffle 33, so that the acrolein aqueous solution is mixed with the steam, and driven by the steam, it moves from the gas outlet 13 to the condensation mechanism 2 to purify the acrolein.

[0059] When the first sleeve 6 and the packing baffle 33 rotate, the connecting sleeve 34 on the packing baffle 33 is driven to rotate, and in this process, the packing material is driven to move, so that the packing material is fully mixed with the acrolein aqueous solution and the steam.

[0060] After a part of purification, the remaining acrolein aqueous solution is reintroduced into the connection between the liquid inlet 11 and the distribution pipe 9 through the connection between the lower part of the condensation mechanism 2 and the reaction tower 1 for separation and purification again.

[0061] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A device for separating and purifying acrolein, comprising a reaction tower (1), a liquid inlet (11) and an air inlet (12) provided on the side wall of the reaction tower (1), an air outlet (13) provided on the top of the reaction tower (1), and a condensing mechanism (2) connected to the air outlet (13), characterized in that: A separation sleeve (3) is fixedly connected to the middle of the reaction tower (1), a connecting sleeve (31) is slidably connected to the separation sleeve (3), a filter plate (32) is fixedly connected to the inner wall of the connecting sleeve (31), a packing baffle (33) is rotatably connected to the inner wall of the separation sleeve (3), and the packing baffle (33) is arranged below the filter plate (32), a plurality of connecting sleeves (34) are rotatably arranged on one side of the filter plate (32) close to the packing baffle (33), and one end of the connecting sleeve (34) away from the filter plate (32) is open, and the connecting sleeves (34) are connected to the filter plate (32). A connecting port (35) is provided on the side wall of the sleeve (34) for passing steam and acrolein aqueous solution. A reinforcing rod (36) is slidably connected to the connecting sleeve (34). A reinforcing plate (37) is fixedly connected to one end of the reinforcing rod (36) close to the opening of the connecting sleeve (34). A vent (38) is provided on the reinforcing plate (37). A blocking plate (39) for blocking the vent (38) is slidably connected to the reinforcing rod (36). A rotating mechanism (4) for driving the packing baffle (33) to rotate is provided on the reaction tower (1).

2. The device for separating and purifying acrolein according to claim 1, characterized in that: A gas collecting plate (5) is fixedly connected to the inner wall of the separation sleeve (3), and the gas collecting plate (5) is arranged in a bamboo hat shape. A liquid flow port (51) is provided at one end of the gas collecting plate (5) close to the inner wall of the separation sleeve (3). The liquid flow ports (51) are circumferentially distributed on the gas collecting plate (5). A reinforcing tube (52) is fixedly connected to the axial position of the gas collecting plate (5), and a gas flow port (53) is provided on the side wall of the reinforcing tube (52).

3. The device for separating and purifying acrolein according to claim 2, characterized in that: The rotating mechanism (4) comprises a rotating motor (41) fixedly connected to the outer wall of the reaction tower (1); a connecting rod (42) is fixedly connected to the output shaft of the rotating motor (41); an end of the connecting rod (42) away from the rotating motor (41) is fixedly connected to a first bevel gear (43); a side of the packing baffle (33) close to the gas collecting plate (5) is fixedly connected to a rotating rod (44); the rotating rod (44) penetrates the gas collecting plate (5); a second bevel gear (45) is fixedly connected to the rotating rod (44); the second bevel gear (45) is meshed with the first bevel gear (43).

4. The device for separating and purifying acrolein according to claim 3, characterized in that: A first sleeve (6) is fixedly connected to the middle of the filler baffle (33), and the first sleeve (6) is arranged to penetrate the filter plate (32). A second sleeve (61) is provided on the filter plate (32), and the second sleeve (61) is arranged toward the filler baffle (33). The second sleeve (61) is sleeved on the outside of the first sleeve (6). A guide block (62) is fixedly connected to the outer wall of the first sleeve (6). A guide groove (63) is provided on the second sleeve (61), and the guide groove (63) is arranged in a wave ring shape. An arc scraper (64) is fixedly connected to the first sleeve (6), and the arc scraper (64) is arranged above the filter plate (32). A storage bin (65) is provided inside the first sleeve (6), and the storage bin (65) is used to store impurities scraped to the middle position by the arc scraper (64).

5. The device for separating and purifying acrolein according to claim 4, characterized in that: One end of the filter plate (32) close to the filler baffle (33) is fixedly connected to a sliding track (7), and the sliding track (7) is arranged in a circular shape. A sliding ring (71) is slidably connected in the sliding track (7), and the sliding ring (71) and the reinforcing rod (36) are rotatably connected. One end of the reinforcing rod (36) close to the sliding ring (71) is fixedly connected to a rotating gear (72). A rotating rack (73) is provided on the inner side wall of the sliding track (7). A sealing ring (74) is slidably connected to the outer side wall of the sliding track (7), and the sealing ring (74) and the reinforcing rod (36) are rotatably connected. A stirring plate (75) is fixedly connected to the outer side wall of the connecting sleeve (34) for driving the filler material located above the filler baffle (33) to move.

6. The device for separating and purifying acrolein according to claim 5, characterized in that: The separating sleeve (3) is provided with a sliding groove (8), the connecting sleeve (34) is fixedly connected with a sliding block (81), and the sliding block (81) is snap-fitted into the sliding groove (8).

7. The device for separating and purifying acrolein according to claim 6, characterized in that: One end of the liquid inlet (11) extending into the reaction tower (1) is fixedly connected to a material distribution pipe (9).

8. A method for separating and purifying acrolein, applied to the device for separating and purifying acrolein according to claim 7, characterized in that: S1, introducing an aqueous acrolein solution into a reaction tower (1), introducing steam into an air inlet (12), the steam moving toward the reinforcing cylinder (52), and moving through a gas flow port (53) to a position between a packing baffle (33) and a gas collecting plate (5), the aqueous acrolein solution moving through a distribution pipe (9) to a filter plate (32), and moving downward after being filtered by the filter plate (32); S2, starting the rotating motor (41), the rotating motor (41) drives the connecting rod (42) to rotate, and drives the filler baffle (33) to rotate under the conduction of the connecting rod (42), the rotation of the filler baffle (33) drives the first sleeve (6) and the arc scraper (64) to rotate, so that the arc scraper (64) collects impurities located above the filter plate (32) and moves them to the storage bin (65), and the first sleeve (6) drives the guide block (62) to rotate during the rotation process, so that the second sleeve (61) moves up and down to a certain extent; S3, the steam flows to the opening on the connecting sleeve (34), and the baffle plate (39) blocks the vent (38) during the upward movement of the second sleeve (61). After the second sleeve (61) moves to the top, it moves downward. At this time, there is more steam below the reinforcing plate (37), which pushes the baffle plate (39) to move upward, so that the gas moves to one end of the connecting sleeve (34) close to the filter plate (32), and moves through the connecting port (35) to the middle position between the filter plate (32) and the packing baffle (33), so that the acrolein aqueous solution is mixed with the steam, and driven by the steam, it moves from the gas outlet (13) to the condensation mechanism (2) to purify the acrolein.

9. The method for separating and purifying acrolein according to claim 8, characterized in that: In step S2, when the first sleeve (6) and the packing baffle (33) rotate, the connecting sleeve (34) located on the packing baffle (33) is driven to rotate, and in the process, the packing material is driven to move, so that the packing material is fully mixed with the acrolein aqueous solution and the steam; in step S3, after the purification of part of the acrolein is completed, the remaining acrolein aqueous solution is re-introduced to the connection between the liquid inlet (11) and the distribution pipe (9) through the connection between the lower part of the condensing mechanism (2) and the reaction tower (1) for separation and purification again.

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