An over-saturated liquid feed anti-polymerization combined distributor for acrylic acid production

Abstract

The utility model discloses a kind of supersaturated liquid feeding anti-polymerization combination distributors for acrylic acid production, it is related to acrylic acid production equipment technical field, including the groove type distribution component and tubular distribution component of installation in the top of de-acetic acid tower, the tubular distribution component is located above groove type distribution component, the upper end of groove type distribution component is set to open, the lower end of tubular distribution component is equipped with a plurality of second distribution holes, the lower end of groove type distribution component is equipped with a plurality of first distribution holes, the utility model is combined by groove type distribution component and tubular distribution component, and groove type distribution component top opening, the liquid that can receive the second distribution hole of tubular distribution component sprays, since groove type distribution component mainly uses the static head caused by liquid level as propulsive force to flow, the flow of each second distribution hole is equal under the condition of stable liquid level, improve feed distribution uniformity, and can clean polymer in tank under the condition of not stopping.

Description

Technical Field

[0001] This utility model relates to the technical field of acrylic acid production equipment, specifically to a supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production. Background Technology

[0002] Currently, the acrylic acid production process uses a three-tower purification process. The first tower is a dehydration tower, the second is a deacetic acid removal tower, and the third is a refining tower. The bottom material of the dehydration tower is conveyed to the top of the deacetic acid removal tower for further processing. The material temperature is 72℃; the material mass fraction is: acrylic acid 70%, acetic acid 5%, toluene 24.5%, and other components 0.5%. The bubble point pressure of this material is approximately 23 kPaA, and the pressure at the top of the deacetic acid removal tower is approximately 5 kPaA, so flash evaporation will occur at the top of the deacetic acid removal tower. After being conveyed into the deacetic acid removal tower, the material is further distributed by a distributor.

[0003] Currently, the common types of distributors in acetic acid removal towers are tubular distributors or trough distributors. The upper opening of the trough distributor allows the material to flash vaporize from the opening. The flash vaporization of the material in the trough can lead to polymerization, and the resulting polymers can clog the distributor.

[0004] The distribution holes of the tubular distributor face downwards and are relatively small, which ensures that the liquid in the distribution tube is full and that the liquid does not vaporize before it is ejected from the distribution holes. However, the disadvantage is that since the tubular distributor is based on pressure injection for distribution, the pressure is different at different locations in the pipe, and the flow rate of each distribution hole will also be different.

[0005] This results in uneven material distribution;

[0006] To address the shortcomings of the tubular and trough-type distributors mentioned above, we need to propose a combined distributor for supersaturated liquid feed to prevent polymerization in acrylic acid production. Utility Model Content

[0007] The purpose of this invention is to provide a supersaturated liquid feed anti-polymerization combination distributor for acrylic acid production. By using a combination of tubular and trough-type distribution components, the feed distribution uniformity is improved, and the polymer in the trough can be cleaned without stopping the machine, thus solving the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production, comprising a trough-type distribution component and a tubular distribution component installed at the top of an acetic acid removal tower. The tubular distribution component is located above the trough-type distribution component, with the upper end of the trough-type distribution component being open. The lower end of the tubular distribution component has multiple second distribution holes, and the lower end of the trough-type distribution component has multiple first distribution holes. The material in the tubular distribution component enters the trough-type distribution component through the second distribution holes and flows out through the first distribution holes into the interior of the acetic acid removal tower.

[0009] Preferably, the trough-type distribution component includes a main trough, one side of which is connected to a plurality of first branch troughs, the ends of which are connected to nitrogen pipes, and the other side of which is connected to a plurality of second branch troughs, with the plurality of first branch troughs and the plurality of second branch troughs being equidistantly distributed on both sides of the main trough.

[0010] Preferably, the main groove, the first branch groove and the second branch groove are all U-shaped in cross-section. The first branch groove located on both sides of the main groove is aligned with the second branch groove, and the length of the first branch groove at the relatively aligned position is less than the length of the second branch groove. A plurality of the first distribution holes are equidistantly distributed at the middle position of the bottom of the first branch groove, the second branch groove and the main groove.

[0011] Preferably, the lengths of the multiple first branch grooves starting from the middle of the main groove decrease sequentially towards the end of the main groove, and the lengths of the multiple second branch grooves decrease sequentially towards the end of the main groove. Furthermore, the ends of the multiple first branch grooves that are away from the main groove are located on the same arc line, and the ends of the multiple second branch grooves that are away from the main groove are all located on another arc line.

[0012] Preferably, the tubular distribution assembly includes a main pipe, one side of which is connected to a plurality of first branch pipes, the same number as the number of first branch channels, and the other side of which is connected to a plurality of second branch pipes, the same number as the number of second branch channels. The first branch pipes are located directly above the first branch channels, and the second branch pipes are located directly above the second branch channels. One end of the main pipe is provided with a liquid inlet.

[0013] Preferably, a plurality of first branch pipes and second branch pipes are equidistantly distributed on both sides of the main pipe, the first branch pipes and second branch pipes on both sides of the main pipe are aligned, and the length of the first branch pipe at the alignment point is less than the length of the second branch pipe.

[0014] Preferably, a plurality of second distribution holes are equidistantly distributed at the middle position of the lower end of the first branch pipe, the second branch pipe and the main pipe. The plurality of first branch pipes and second branch pipes are connected to the main pipe through flanges. The length of the first branch pipe is the same as the length of the first branch groove at the corresponding position, and the length of the second branch pipe is the same as the length of the second branch groove at the corresponding position.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model combines a trough-type distribution component with a tubular distribution component. The top of the trough-type distribution component is open to receive the liquid sprayed from the second distribution hole of the tubular distribution component. The bottom of the trough-type distribution component is provided with a second distribution hole. Since the trough-type distribution component mainly uses the static liquid difference brought about by the liquid level as the driving force for flow, the flow rate of each second distribution hole is equal when the liquid level is stable, which improves the uniformity of feed distribution and can clean the polymer in the trough without stopping the machine. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0018] Figure 2 This is a top view of the slotted distribution component of this utility model;

[0019] Figure 3 This is a bottom view of the grooved distribution component of this utility model;

[0020] Figure 4 This is a schematic diagram of the tubular distribution component structure of this utility model.

[0021] In the diagram: 1. Tank-type distribution assembly; 11. Main tank; 12. First branch tank; 13. Nitrogen pipeline; 14. Second branch tank; 2. Pipe-type distribution assembly; 21. Main pipe; 22. First branch pipe; 23. Second branch pipe; 3. First distribution hole; 4. Second distribution hole; 5. Liquid inlet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4This utility model provides a technical solution: a supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production, including a trough-type distribution component 1 and a tubular distribution component 2 installed at the top of the deacetic acid tower. The tubular distribution component 2 is located above the trough-type distribution component 1. The upper end of the trough-type distribution component 1 is open. The lower end of the tubular distribution component 2 is provided with a plurality of second distribution holes 4. The lower end of the trough-type distribution component 1 is provided with a plurality of first distribution holes 3. The material in the tubular distribution component 2 enters the trough-type distribution component 1 through the second distribution holes 4 and flows out through the first distribution holes 3 into the interior of the deacetic acid tower.

[0024] The trough-type distribution component 1 and the tubular distribution component 2 are combined. The top of the trough-type distribution component 1 is open to receive the liquid sprayed from the second distribution hole 4 of the tubular distribution component 2. The bottom of the trough-type distribution component 1 is provided with the second distribution hole 4. Since the trough-type distribution component 1 mainly uses the static liquid difference brought about by the liquid level as the driving force for flow, the flow rate of each second distribution hole 4 is equal when the liquid level is stable, which improves the uniformity of feed distribution and can clean the polymer in the trough without stopping the machine.

[0025] The trough-type distribution component 1 includes a main trough 11. One side of the main trough 11 is connected to a plurality of first branch troughs 12. The end of the first branch trough 12 is connected to a nitrogen pipe 13. The other side of the main trough 11 is connected to a plurality of second branch troughs 14. The plurality of first branch troughs 12 and the plurality of second branch troughs 14 are equidistantly distributed on both sides of the main trough 11. The first branch troughs 12 and the second branch troughs 14 form the secondary troughs of the trough-type distribution component 1. Nitrogen purging can be performed periodically through the nitrogen pipe 13.

[0026] The main groove 11, the first branch groove 12, and the second branch groove 14 all have U-shaped cross-sections. The first branch groove 12, located on both sides of the main groove 11, is aligned with the second branch groove 14, and the length of the first branch groove 12 at the aligned position is less than the length of the second branch groove 14. Figure 2 As shown, counting from left to right, the length of the first first branch trough 12 is less than the length of the first second branch trough 14, the length of the second first branch trough 12 is less than the length of the second second branch trough 14, and so on. Multiple first distribution holes 3 are equidistantly distributed at the middle position of the bottom of the first branch trough 12, the second branch trough 14 and the main trough 11, so that the trough distribution component 1 can use the static liquid difference brought by the liquid level as the driving force for flow. Under the condition of stable liquid level, the flow rate of each first distribution hole 3 is equal, thereby improving the uniformity of liquid distribution.

[0027] Starting from the middle of the main trough 11, the lengths of multiple first branch troughs 12 decrease sequentially towards the end of the main trough 11, and the lengths of multiple second branch troughs 14 decrease sequentially towards the end of the main trough 11. The ends of multiple first branch troughs 12 that are away from the main trough 11 are located on the same arc, and the ends of multiple second branch troughs 14 that are away from the main trough 11 are located on another arc. This allows the first branch troughs 12 to periodically purge the trough distribution assembly 1 through the nitrogen pipeline 13. Taking advantage of the slightly longer second branch troughs 14, polymers generated during production can be temporarily accumulated, and the polymers can be cleaned up when the machine stops.

[0028] The tubular distribution assembly 2 includes a main pipe 21. One side of the main pipe 21 is connected to a plurality of first branch pipes 22, the same number as the first branch trough 12. The other side of the main pipe 21 is connected to a plurality of second branch pipes 23, the same number as the second branch trough 14. The first branch pipes 22 are located directly above the first branch trough 12, and the second branch pipes 23 are located directly above the second branch trough 14. One end of the main pipe 21 is provided with a liquid inlet 5. The material enters the tubular distribution assembly 2 through the liquid inlet 5, and then is sprayed out from the second distribution hole 4. It undergoes flash evaporation between the tubular distribution assembly 2 and the trough distribution assembly 1. The flashed liquid enters the trough distribution assembly 1 and is then distributed through the trough distribution assembly 1.

[0029] Multiple first branch pipes 22 and second branch pipes 23 are equidistantly distributed on both sides of the main pipe 21. The first branch pipes 22 and second branch pipes 23 on both sides of the main pipe 21 are aligned, and the length of the first branch pipe 22 at the alignment point is less than the length of the second branch pipe 23. This allows the dimensions of the first branch pipes 22 and second branch pipes 23 to fit the inner wall of the acetic acid removal tower, facilitating the installation of the trough distribution assembly 1 on the inner wall of the acetic acid removal tower. It also facilitates the spraying of liquid through the second distribution holes 4 on the first branch pipes 22 and second branch pipes 23, which, after flash evaporation, enter the corresponding first branch trough 12 and second branch trough 14.

[0030] Multiple second distribution holes 4 are equidistantly distributed at the middle of the lower ends of the first branch pipe 22, the second branch pipe 23, and the main pipe 21. The multiple first branch pipes 22 and second branch pipes 23 are connected to the main pipe 21 through flanges. The length of the first branch pipe 22 is the same as the length of the first branch groove 12 at the corresponding position, and the length of the second branch pipe 23 is the same as the length of the second branch groove 14 at the corresponding position. In specific installation, the ends of the first branch pipes 22 and second branch pipes 23 near the main pipe 21 are fixed with flanges. The main pipe 21 is provided with an interface for connecting to the multiple first branch pipes 22 and second branch pipes 23, and a flange is also installed at the interface. The flanges on the main pipe 21 are connected to the flanges on the first branch pipes 22 and second branch pipes 23 by bolts, and a sealing ring is provided between the two flanges. The sealing ring is used to increase the sealing of the flange connection. When a first branch pipe 22 or second branch pipe 23 is blocked, the first branch pipe 22 or second branch pipe 23 can be disassembled and cleaned separately, improving the convenience of use.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production, characterized in that: The system includes a trough-type distribution assembly (1) and a tubular distribution assembly (2) installed at the top of the acetic acid removal tower. The tubular distribution assembly (2) is located above the trough-type distribution assembly (1). The upper end of the trough-type distribution assembly (1) is open. The lower end of the tubular distribution assembly (2) has multiple second distribution holes (4). The lower end of the trough-type distribution assembly (1) has multiple first distribution holes (3). The material in the tubular distribution assembly (2) enters the trough-type distribution assembly (1) through the second distribution holes (4) and flows out through the first distribution holes (3) into the interior of the acetic acid removal tower.

2. The supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production according to claim 1, characterized in that: The trough-type distribution component (1) includes a main trough (11), one side of which is connected to a plurality of first branch troughs (12), the end of which is connected to a nitrogen pipe (13), and the other side of which is connected to a plurality of second branch troughs (14). The plurality of first branch troughs (12) and the plurality of second branch troughs (14) are equidistantly distributed on both sides of the main trough (11).

3. A supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production according to claim 2, characterized in that: The main groove (11), the first branch groove (12) and the second branch groove (14) are all U-shaped. The first branch groove (12) located on both sides of the main groove (11) is aligned with the second branch groove (14), and the length of the first branch groove (12) at the relatively aligned position is less than the length of the second branch groove (14). Multiple first distribution holes (3) are equidistantly distributed at the middle position of the bottom of the first branch groove (12), the second branch groove (14) and the main groove (11).

4. A supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production according to claim 3, characterized in that: Starting from the middle of the main groove (11), the lengths of multiple first branch grooves (12) decrease sequentially toward the end of the main groove (11), and the lengths of multiple second branch grooves (14) decrease sequentially toward the end of the main groove (11). The ends of multiple first branch grooves (12) away from the main groove (11) are located on the same arc, and the ends of multiple second branch grooves (14) away from the main groove (11) are located on another arc.

5. A supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production according to claim 4, characterized in that: The tubular distribution assembly (2) includes a main pipe (21), one side of which is connected to a plurality of first branch pipes (22) in the same number as the first branch channel (12), and the other side of which is connected to a plurality of second branch pipes (23) in the same number as the second branch channel (14). The first branch pipes (22) are located directly above the first branch channel (12), and the second branch pipes (23) are located directly above the second branch channel (14). One end of the main pipe (21) is provided with a liquid inlet (5).

6. A supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production according to claim 5, characterized in that: Multiple first branch pipes (22) and second branch pipes (23) are equidistantly distributed on both sides of the main pipe (21). The first branch pipes (22) and second branch pipes (23) located on both sides of the main pipe (21) are aligned, and the length of the first branch pipe (22) located at the alignment point is less than the length of the second branch pipe (23).

7. A supersaturated liquid feed anti-polymerization combined distributor for acrylic acid production according to claim 6, characterized in that: Multiple second distribution holes (4) are equidistantly distributed at the middle position of the lower end of the first branch pipe (22), the second branch pipe (23) and the main pipe (21). Multiple first branch pipes (22) and second branch pipes (23) are connected to the main pipe (21) through flanges. The length of the first branch pipe (22) is the same as the length of the first branch groove (12) at the corresponding position, and the length of the second branch pipe (23) is the same as the length of the second branch groove (14) at the corresponding position.

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