A methylal removal column for a propylene oxide plant

Abstract

This invention relates to the field of methylal removal technology and discloses a methylal removal tower for a propylene oxide plant, comprising a main body with a feed inlet in the middle. When the spring swings back and forth, the rotating ball rotates inside the connecting rod via a second connecting rod, thereby applying a partial thrust to the liquid and the gas entering the liquid. This creates slight turbulence within the liquid, mixing the liquid and gas accumulated between the two baffles. This reduces the likelihood of stagnant liquid forming inside the baffles during the removal of methylal as part of the liquid passing through them, which would otherwise hinder methylal removal. This ensures the speed of methylal removal and improves the overall quality of methylal removal from propylene oxide.

Description

Technical Field

[0001] This invention relates to the field of methyl acetal removal technology, specifically to a methyl acetal removal tower for propylene oxide plants. Background Technology

[0002] This device uses crude propylene oxide as feedstock and achieves efficient removal of methyl acetal impurities through gas-liquid countercurrent contact mass transfer, which can stably meet the stringent requirements for methyl acetal residue in downstream propylene oxide production.

[0003] When removing methylal from the propylene oxide unit, the feed inlet in the middle of the unit is connected to the feed pipe. Crude propylene oxide enters the tower through the feed inlet under the conveying pipe. At this time, the crude propylene oxide falls down through the filter plate holes. The bottom of the tower heats and vaporizes the crude propylene oxide. The rising gas passes through the filter plate and forms bubbles in the liquid layer of the tower plate. It comes into countercurrent contact with the liquid flowing down the plate. The vapor containing methylal is discharged from the top of the tower, and the purified propylene oxide product is obtained at the bottom of the tower. In this process, when some methylal is converted into gas and removed by the liquid passing through the two baffles, the liquid inside the two baffles may become stagnant and unable to flow. This will affect the removal of methylal in the subsequent rising gas, thus affecting the speed of methylal removal and the quality of methylal removal from the propylene oxide. Summary of the Invention

[0004] The purpose of this invention is to provide a methyl acetal removal tower for propylene oxide plants to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a methyl acetal removal tower for a propylene oxide plant, comprising a main body, a feed inlet located in the middle of the main body, and further comprising:

[0007] Auxiliary mechanisms are installed inside the main body to assist the movement of internal components during the operation of the main body.

[0008] A shrinking mechanism is installed on the side wall of the auxiliary mechanism and is used to shrink on the side wall of the main body with the assistance of the auxiliary mechanism.

[0009] Furthermore, the main body includes:

[0010] The filter assembly is installed inside the main body and is used to remove methyl acetal from the propylene oxide during the operation of the main body.

[0011] A rotating component is installed on the side wall of the filter assembly and is used to rotate the filter assembly when it is affected by the internal components.

[0012] Furthermore, the auxiliary mechanisms include:

[0013] The push component is mounted on top of the rotating component and is used to drive the rotating component to move by the thrust of liquid propylene oxide when the filter component is working.

[0014] The oscillating component is mounted on the outer surface of the rotating component and oscillates as the rotating component rotates.

[0015] Furthermore, the shrinkage mechanism includes:

[0016] The connecting component is installed on the side wall of the swing component. The connecting component will drive the internal components to run when the swing component moves.

[0017] Furthermore, the filter assembly includes several filter plates fixedly connected inside the main body, and two baffles are fixedly connected to the top of the filter plates;

[0018] Several filter plates are arranged at equal angles on the inner wall of the main body.

[0019] Furthermore, the rotating assembly includes several connecting rods fixedly connected between the two baffles, and several rotating balls are rotatably connected inside the connecting rods;

[0020] Two connecting rods are fixedly connected to the outer surface of the rotating ball, and a spring is rotatably connected to one end of each connecting rod away from the rotating ball.

[0021] The sidewall of the spring is fixedly connected to the sidewalls of the two baffles.

[0022] Furthermore, the actuating component includes a fixed shaft fixedly connected to the top of the spring, and several fixed shafts have floats fixedly connected to their tops;

[0023] The float is U-shaped.

[0024] Furthermore, the inside of the float plate has several triangular grooves, and the top of the float plate has a conical groove;

[0025] The angle of the triangular groove is parallel to that of the connecting rod.

[0026] Furthermore, the swing assembly includes a plurality of sliding blocks slidably connected to an outer surface of the connecting rod, and a swing plate is rotatably connected to the top of the plurality of sliding blocks;

[0027] Among them, the bottom of several sliding blocks is fixedly connected to the bottom of the spring.

[0028] Furthermore, the connecting assembly includes a connecting plate rotatably connected between the two swing plates, and an elastic plate rotatably connected to the side wall of the swing plate;

[0029] The side of the elastic plate furthest from the connecting plate is rotatably connected to the side wall of the baffle.

[0030] The present invention has the following beneficial effects:

[0031] (1) In this invention, when the spring swings back and forth, it will drive the rotating ball to rotate inside the connecting rod 1 through the connecting rod 2 connected inside it, thereby applying a partial thrust to the liquid and the gas entering the liquid, causing a slight turbulence inside the liquid, thereby mixing the liquid and gas accumulated between the two baffles, reducing the situation where the liquid inside the two baffles becomes stagnant and cannot flow when the liquid between the two baffles is removed as part of the methylal, thus ensuring the speed of methylal removal and improving the overall quality of the device in removing methylal from propylene oxide.

[0032] (2) In this invention, when the float plate swings in the opposite direction, the spring on the other side will contract and drive the swing plate near the lower liquid outlet to swing under the action of the sliding block. When the swing plate swings, the falling liquid is transported to the inside of the two baffles and comes into contact with the rising gas. When the liquid inside the baffle flows downward, the liquid at the bottom flows back to the top under the push of the swing plate, and then enters the next filter plate in the subsequent flow. This reduces the situation where the liquid is floating on the top of the float plate and thus the liquid is subjected to the directional force of the float plate after it comes into contact with the bottom of the float plate, resulting in a decrease in the total amount of liquid flowing downward. This keeps the liquid flow stable and improves the efficiency of the device in removing methyl acetal from propylene oxide.

[0033] (3) In this invention, the movement of the spring causes the distance to be extended, which increases the gap between the extended parts, thereby pulling the other side of the float plate downward. This causes some liquid to be thrown into the float plate and then transported to the outer baffle through the triangular groove opened inside the float plate, so as to facilitate the downward flow of the liquid. This reduces the situation where some liquid splashes into the interior of the float plate and cannot move after being pushed by the spring and the float plate, thus affecting the quality of methyl acetal removal. This reduces the influence of the float plate on the liquid and further improves the overall quality of the device in removing methyl acetal from propylene oxide.

[0034] (4) In this invention, under the action of the triangular groove inside the float plate, the liquid entering the float plate will be in the liquid tilted at the bottom of the float plate. At the same time, after the vaporized methyl acetal comes into contact with the liquid at the bottom of the float plate, it gradually rises to the next layer and accumulates for further removal. This reduces the situation where some of the decomposed gas will be blocked by the bottom of the float plate and escape when the liquid flows and drives the float plate to shake. This allows the methyl acetal to be removed better, further improving the efficiency of the device in removing methyl acetal from propylene oxide.

[0035] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention;

[0039] Figure 3 This is a partial cross-sectional view of the filter component of the present invention;

[0040] Figure 4 This is a diagram showing the connection relationships of the rotating components of the present invention;

[0041] Figure 5 This is a partial cross-sectional view of the rotating component of the present invention;

[0042] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0043] Figure 7 This is a partial cross-sectional view of the component driving the present invention;

[0044] Figure 8 This invention promotes the connection relationship diagram of the components;

[0045] Figure 9 For the present invention Figure 8 Enlarged view of point B in the middle.

[0046] The attached diagram lists the components represented by each number as follows:

[0047] In the diagram: 1. Main body; 101. Feed inlet; 11. Filter assembly; 111. Filter plate; 112. Baffle; 12. Rotating assembly; 121. Connecting rod one; 122. Rotating ball; 123. Connecting rod two; 124. Spring; 2. Auxiliary mechanism; 21. Pushing assembly; 211. Fixed shaft; 212. Float plate; 213. Triangular groove; 214. Conical groove; 22. Swing assembly; 221. Sliding block; 222. Swing plate; 3. Retraction mechanism; 31. Connecting assembly; 311. Connecting plate; 312. Elastic plate. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please see Figures 1-9 As shown, the present invention is a methylal removal tower for a propylene oxide plant, comprising a main body 1, wherein a feed inlet 101 is provided in the middle of the main body 1, and further comprising:

[0050] Auxiliary mechanism 2 is installed inside the main body 1 and is used to assist the movement of internal components when the main body 1 is running;

[0051] The shrinking mechanism 3 is installed on the side wall of the auxiliary mechanism 2 and is used to shrink on the side wall of the main body 1 with the assistance of the auxiliary mechanism 2.

[0052] Entity 1 includes:

[0053] The filter assembly 11 is installed inside the main body 1 and is used to remove methyl acetal from the propylene oxide during the operation of the main body 1.

[0054] Rotating component 12 is installed on the side wall of filter component 11 and is used to rotate the filter component 11 when it is affected by the internal components.

[0055] Auxiliary mechanism 2 includes:

[0056] A push assembly 21 is installed on top of the rotating assembly 12 and is used to push the rotating assembly 12 to move under the thrust of liquid propylene oxide when the filter assembly 11 is working.

[0057] The swing component 22 is mounted on the outer surface of the rotating component 12 and swings when the rotating component 12 rotates.

[0058] The shrinkage mechanism 3 includes:

[0059] The connecting component 31 is installed on the side wall of the swing component 22. The connecting component 31 will drive the internal components of the connecting component 31 to run when the swing component 22 moves.

[0060] The filter assembly 11 includes several filter plates 111 fixedly connected inside the main body 1, and two baffles 112 are fixedly connected to the top of the filter plates 111.

[0061] Several filter plates 111 are arranged at equal angles on the inner wall of the main body 1. Crude propylene oxide falls downward through the holes inside the filter plates 111. When the crude propylene oxide falls into the bottom of the tower, the bottom of the tower heats and vaporizes the crude propylene oxide. Therefore, the rising steam generated contains methyl acetal and some propylene oxide.

[0062] The rotating assembly 12 includes a plurality of connecting rods 121 fixedly connected between two baffles 112, and a plurality of rotating balls 122 are rotatably connected inside the connecting rods 121.

[0063] Two connecting rods 123 are fixedly connected to the outer surface of the rotating ball 122, and a spring 124 is rotatably connected to one end of the connecting rods 123 away from the rotating ball 122.

[0064] The side wall of the spring 124 is fixedly connected to the side walls of the two baffles 112. When the spring 124 swings back and forth, it will drive the rotating ball 122 to rotate inside the connecting rod 121 through the connecting rod 123 connected inside it, thereby applying a partial thrust to the liquid and the gas entering the liquid, causing slight turbulence inside the liquid.

[0065] The pushing assembly 21 includes a fixed shaft 211 fixedly connected to the top of the spring 124, and a floating plate 212 is fixedly connected to the top of several fixed shafts 211;

[0066] The float plate 212 is U-shaped. When the liquid flows over the baffle 112 to the next filter plate 111, the moving liquid will cause the float plate 212 floating on top of it to sway back and forth. When the float plate 212 sways, it will drive the spring 124 in contact with it to sway through the fixed shaft 211 at the bottom.

[0067] The float plate 212 has several triangular grooves 213 inside, and a conical groove 214 is provided on the top of the float plate 212;

[0068] The angle of the triangular groove 213 is parallel to that of the connecting rod 121. When the float 212 is pushed back and forth by the liquid, it will drive the spring 124 to swing back and forth through the fixed shaft 211.

[0069] The swing assembly 22 includes a plurality of sliding blocks 221 slidably connected to the outer surface of the connecting rod 121, and a swing plate 222 is rotatably connected to the top of the plurality of sliding blocks 221.

[0070] Among them, the bottom of several sliding blocks 221 is fixedly connected to the bottom of spring 124. When the swing plate 222 moves, it will contact the contracted spring 124 and then swing upward under the push of the outer surface of spring 124. When the swing plate 222 swings, it will push some liquid to flow downward through filter plate 111.

[0071] The connecting assembly 31 includes a connecting plate 311 rotatably connected between two swing plates 222, and an elastic plate 312 rotatably connected to the side wall of the swing plate 222.

[0072] Among them, the side of the elastic plate 312 away from the connecting plate 311 is rotatably connected to the side wall of the baffle 112. The swing of the swing plate 222 will drive the other components to swing through the connecting plate 311. Then, when the swing plate 222 moves, the elastic plate 312 will stretch and accumulate potential energy to facilitate the subsequent reset of the swing plate 222.

[0073] In use, the feed inlet 101 in the middle of the device is first connected to the pipeline for conveying crude propylene oxide. The gas outlet at the top and the gas inlet at the bottom of the device are also connected to the pipeline to be connected. After the crude propylene oxide enters the interior of the main body 1 through the feed inlet 101, it will fall down through the holes inside the filter plate 111. When the crude propylene oxide falls into the bottom of the tower, the bottom of the tower will heat and vaporize the crude propylene oxide. The resulting rising vapor contains methylal and some propylene oxide. When the gas rises, it will pass through the filter plate 111 and form bubbles in the liquid layer of the tower plate. It will come into countercurrent contact with the liquid flowing down the plate. The light component methylal will continuously transfer from the liquid phase to the gas phase, while the heavy component propylene oxide will transfer from the gas phase to the liquid phase. After the vapor at the top of the column is condensed, part of it returns to the column as reflux liquid from the upper side port to continue participating in mass transfer, while the other part is collected as the top product rich in methyl acetal. This allows the vapor enriched with methyl acetal to be discharged from the top outlet of the column. After condensation, part of it is refluxed and part is collected, while the purified propylene oxide product is obtained at the bottom of the column, thus completing the removal of methyl acetal from the propylene oxide.

[0074] As the gas containing methylal and a portion of propylene oxide rises, it comes into contact with the liquid propylene oxide accumulated on top of filter plate 111. Some of the gas then enters the liquid and reacts. Simultaneously, under the action of baffle 112, the liquid accumulates to a certain extent on top of filter plate 111 and flows downwards plate by plate to the bottom of the tower, maintaining counter-current contact with the rising steam throughout the process. As the liquid flows past baffle 112 to the next filter plate 111, the moving liquid causes the float plate 212 floating on top to sway back and forth. This swaying of the float plate 212 drives the spring 124, which is in contact with it, to sway via the fixed shaft 211 at the bottom. During the back-shaking motion, the rotating ball 122 is driven to rotate inside the connecting rod 121 via the connecting rod 123. This exerts a partial thrust on the liquid and the gas entering the liquid, causing slight turbulence inside the liquid. This mixes the liquid and gas accumulated between the two baffles 112, reducing the possibility of stagnant liquid forming inside the baffles 112 and hindering the removal of methylal when some of the methylal is converted into gas by the liquid passing through the baffles 112. This ensures the speed of methylal removal and improves the overall quality of the device in removing methylal from propylene oxide.

[0075] When the float 212 is pushed back and forth by the liquid, it drives the spring 124 to swing back and forth via the fixed shaft 211. Since the direction of the spring 124's swing is the direction of liquid flow, when the float 212 is pushed, the side of the spring 124 near the downward outlet contracts during the swing. When this side of the spring 124 contracts, its diameter increases. Therefore, the contracted side of the spring 124 pushes the sliding block 221 to slide on the connecting rod 121. As the sliding block 221 slides, it drives the top swing plate 222 to move. When the swing plate 222 moves, it contacts the contracted spring 124 and then swings upwards under the push of the outer surface of the spring 124. During the swing of the swing plate 222, some liquid is pushed downwards through the filter plate 111. Simultaneously, the swing of the swing plate 222 drives the other components to swing via the connecting plate 311. Then, when the swing plate 222... When the device moves, the elastic plate 312 stretches and accumulates potential energy to facilitate the subsequent reset of the swing plate 222. Then, when the float plate 212 swings in the opposite direction, the spring 124 on the other side contracts, causing the swing plate 222 near the lower liquid outlet to swing under the action of the sliding block 221. When the swing plate 222 swings, the falling liquid is transported to the inside of the two baffles 112 and comes into contact with the rising gas. When the liquid inside the baffles 112 flows downward, the liquid at the bottom flows back to the top under the push of the swing plate 222, and then enters the next filter plate 111 in the subsequent flow. This reduces the situation where the liquid is floating on the top of the float plate 212, which causes the liquid to be subjected to the directional force of the float plate 212 after contacting the bottom of the float plate 212, resulting in a decrease in the total amount of liquid flowing downward. This keeps the liquid flow stable and improves the efficiency of the device in removing methyl acetal from propylene oxide.

[0076] When the float plate 212 pushes the spring 124 to oscillate via the fixed shaft 211 at the bottom, the spring 124 will contract on one side and stretch on the other during the oscillation. Therefore, the diameter of the contracted part of the spring 124 increases due to the reduced distance between the two parts. This causes one side of the float plate 212 to tilt up under the push of the contracting spring 124, while the other side is extended due to the movement of the spring 124. This increases the distance between the extended parts, thereby pulling the other side of the float plate 212 downward. This causes some liquid to be flung into the float plate 212 and then transported to the outer baffle 112 through the triangular groove 213 inside the float plate 212. This facilitates the downward flow of the liquid and reduces the situation where some liquid splashes into the interior of the float plate 212 and cannot move after being pushed by the spring 124 and the float plate 212, thus affecting the quality of methylal removal. This reduces the impact of the float plate 212 on the liquid and further improves the overall quality of the device in removing methylal from propylene oxide.

[0077] When the float plate 212 oscillates back and forth due to the movement of the liquid, the conical groove 214 inside the float plate 212 comes into contact with the moving liquid through its inner wall. Since the conical groove 214 is conical, when the liquid comes into contact with the conical groove 214, only a small amount of liquid leaves the conical groove 214 and enters the interior of the float plate 212. Then, under the action of the triangular groove 213 inside the float plate 212, the liquid that has entered the interior of the float plate 212 will be in the liquid at the bottom of the float plate 212. At the same time, the methyl acetal that has vaporized after contacting the liquid at the bottom of the float plate 212 completes the removal of this layer and gradually rises to the next layer and accumulates for further removal. This reduces the situation where some of the decomposed gas will escape due to the obstruction at the bottom of the float plate 212 when the liquid flows and drives the float plate 212 to sway, allowing the methyl acetal to be removed more effectively, thus improving the efficiency of the device in removing methyl acetal from propylene oxide.

[0078] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A methylal removal tower for a propylene oxide plant, comprising a main body (1), wherein a feed inlet (101) is provided in the middle of the main body (1), characterized in that, Also includes: Auxiliary mechanism (2) is installed inside the main body (1) to assist the movement of internal components when the main body (1) is running; A shrinking mechanism (3) is installed on the side wall of the auxiliary mechanism (2) for shrinking on the side wall of the main body (1) with the assistance of the auxiliary mechanism (2).

2. The methyl acetal removal tower for a propylene oxide plant according to claim 1, characterized in that: The main body (1) includes: A filter assembly (11) is installed inside the main body (1) for removing methyl acetal from the propylene oxide during operation of the main body (1). A rotating component (12) is installed on the side wall of the filter assembly (11) for rotating when the filter assembly (11) is affected by the internal components.

3. A methyl acetal removal tower for a propylene oxide plant according to claim 2, characterized in that: The auxiliary mechanism (2) includes: A pushing component (21) is mounted on top of the rotating component (12) and is used to push the rotating component (12) to move by the thrust of liquid propylene oxide when the filter component (11) is working; The swing component (22) is mounted on the outer surface of the rotating component (12) and swings when the rotating component (12) rotates.

4. A methyl acetal removal tower for a propylene oxide plant according to claim 3, characterized in that: The shrinkage mechanism (3) includes: The connecting component (31) is installed on the side wall of the swing component (22). The connecting component (31) will drive the internal components of the connecting component (31) to run when the swing component (22) moves.

5. A methyl acetal removal tower for a propylene oxide plant according to claim 4, characterized in that: The filter assembly (11) includes a plurality of filter plates (111) fixedly connected inside the main body (1), and two baffles (112) are fixedly connected to the top of the filter plates (111). Among them, several filter plates (111) are arranged at equal angles on the inner wall of the main body (1).

6. A methyl acetal removal tower for a propylene oxide plant according to claim 5, characterized in that: The rotating assembly (12) includes a plurality of connecting rods (121) fixedly connected between two baffles (112), and a plurality of rotating balls (122) are rotatably connected inside the connecting rods (121). Two connecting rods (123) are fixedly connected to the outer surface of the rotating ball (122), and a spring (124) is rotatably connected to one end of each connecting rod (123) away from the rotating ball (122). The sidewall of the spring (124) is fixedly connected to the sidewalls of the two baffles (112).

7. A methyl acetal removal tower for a propylene oxide plant according to claim 6, characterized in that: The pushing assembly (21) includes a fixed shaft (211) fixedly connected to the top of the spring (124), and a floating plate (212) is fixedly connected to the top of a plurality of the fixed shafts (211). The float plate (212) is U-shaped in general.

8. A methyl acetal removal tower for a propylene oxide plant according to claim 7, characterized in that: The float (212) has several triangular grooves (213) inside and a conical groove (214) on the top of the float (212). The angle of the triangular groove (213) is parallel to that of the connecting rod (121).

9. A methyl acetal removal tower for a propylene oxide plant according to claim 6, characterized in that: The swing assembly (22) includes a plurality of sliding blocks (221) slidably connected to the outer surface of the connecting rod (121), and a swing plate (222) is rotatably connected to the top of the plurality of sliding blocks (221). The bottom of several of the sliding blocks (221) is fixedly connected to the bottom of the spring (124).

10. A methyl acetal removal tower for a propylene oxide plant according to claim 9, characterized in that: The connecting assembly (31) includes a connecting plate (311) rotatably connected between two swing plates (222), and an elastic plate (312) is rotatably connected to the side wall of the swing plate (222). The elastic plate (312) is rotatably connected to the side wall of the baffle (112) on the side away from the connecting plate (311).

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