A filtering and separating device for maleic anhydride hydrogenation catalyst

Abstract

The utility model discloses a kind of malonic acid hydrogenation catalyst filtering separation devices, including shell and discharge port, shell is sequentially separated into return liquid cavity, pure liquid cavity, fine filter cavity, coarse filter cavity and storage cavity from top to bottom by multiple partitions, the top of shell is provided with return liquid port, the side wall of pure liquid cavity is provided with liquid outlet, return liquid pipe is communicated between liquid outlet and return liquid port, several filter elements are provided in fine filter cavity, several liquid injection pipes are provided between filter element, several liquid injection holes are uniformly distributed on liquid injection pipe, vertical pipe is concentrically arranged in coarse filter cavity, the annular region between vertical pipe and shell is separated into several coarse filter chambers by a vertical plate and several filter screens, the side wall of coarse filter chamber on the side of vertical plate is provided with feed inlet, the top of coarse filter chamber on the other side of vertical plate is provided with liquid inlet, vertical pipe and the bottom of each coarse filter chamber are provided with discharge port. In conclusion, the utility model has the advantages of filter element not easy to block, high work efficiency, and can realize online cleaning.

Description

Technical Field

[0001] This utility model relates to the technical field of maleic anhydride hydrogenation catalyst filtration and separation equipment, specifically to a maleic anhydride hydrogenation catalyst filtration and separation device. Background Technology

[0002] Maleic anhydride hydrogenation catalyst is a key material used to selectively hydrogenate maleic anhydride to prepare high-value-added chemicals. After the hydrogenation reaction is complete, the circulation of the reactor liquid is stopped, the pressure is slowly released, the tail gas is washed and released into the atmosphere, and then nitrogen is introduced to replace the reactor. After the reactor liquid temperature drops to 130°C, the reaction product is filtered through the catalyst filter by the hydrogenation circulation pump and then transported to the crude succinic anhydride intermediate tank. The filtered catalyst is backwashed into the hydrogenation reactor through the maleic anhydride feed for recycling in the next batch of reaction.

[0003] Current catalyst filtration and separation devices mostly use external filtration filters, where reaction products are filtered from the outside to the inside of the filter element, while the catalyst is trapped on the outside. This often presents the following problems during operation: First, because the reaction products have a certain viscosity, polymers may be generated. These polymers and catalysts adhere to the outer surface of the filter element, quickly clogging it. This clogging is often difficult to remove through backwashing or backflushing, affecting the normal operation of the entire equipment, resulting in frequent maintenance and high operating costs. Second, backwashing or backflushing the filter element requires stopping normal equipment operation, reducing equipment efficiency. Third, the entire filtration work is borne by the filter element, placing a heavy workload on it. Therefore, developing a maleic anhydride hydrogenation catalyst filtration and separation device with a filter element that is less prone to clogging, has high efficiency, and allows for online cleaning is objectively necessary. Utility Model Content

[0004] The purpose of this invention is to provide a maleic anhydride hydrogenation catalyst filtration and separation device with a filter element that is not easily clogged, has high working efficiency, and can be cleaned online.

[0005] The purpose of this utility model is achieved as follows: It includes a shell and a discharge port. The shell is internally divided from top to bottom by multiple partitions into a return liquid chamber, a clean liquid chamber, a fine filtration chamber, a coarse filtration chamber, and a storage chamber. A return liquid port is located at the top of the shell. A discharge port is located on the side wall of the clean liquid chamber. The discharge port and the return liquid port are connected by a return liquid pipe. Several filter elements are installed in the fine filtration chamber. The upper end of each filter element is connected to the clean liquid chamber. Several spray pipes are installed between the filter elements, and several spray holes are evenly distributed on the spray pipes. The upper end of the liquid pipe is connected to the return liquid chamber. A vertical pipe is concentrically arranged in the coarse filtration chamber. The upper end of the vertical pipe is connected to the fine filtration chamber, and the lower end is connected to the storage chamber. The annular area between the vertical pipe and the shell is divided into several coarse filtration chambers by a vertical plate and several filter screens. A feed inlet is provided on the side wall of the coarse filtration chamber on one side of the vertical plate, and a liquid inlet is provided on the top of the coarse filtration chamber on the other side of the vertical plate. A discharge port is provided at the bottom of the vertical pipe and each coarse filtration chamber. A discharge valve is provided on the discharge port, and the discharge outlet is located on the storage chamber.

[0006] Furthermore, the mesh diameter of the filter screen gradually decreases along the direction of liquid flow.

[0007] Furthermore, heating jackets are provided on the outer walls of the fine filtration chamber, coarse filtration chamber, and storage chamber.

[0008] Furthermore, the spray nozzle is angled downwards.

[0009] Furthermore, a horizontal mesh is installed on the liquid inlet.

[0010] Furthermore, a screen is inclinedly installed inside the storage chamber, the discharge port is located above the lower end of the screen, and a slag discharge port is provided at the bottom of the storage chamber.

[0011] This invention is used for the filtration and separation of catalysts in the hydrogenation process of maleic anhydride. During operation, the reaction product containing the catalyst enters the coarse filter chamber from the feed inlet, and then flows through each coarse filter chamber in sequence. After multiple filtrations by the filter screen, the larger catalyst particles in the reaction product are filtered out. The remaining reaction product, carrying the catalyst, enters the fine filter chamber and flows from the outside of the filter element to the inside. The catalyst is intercepted on the outer wall of the filter element tube and falls continuously, completing the fine filtration process of the catalyst in the reaction product, and obtaining a relatively pure reaction product without catalyst. The reaction product flows from the inside of the filter element tube into the clean liquid chamber and is discharged from the outlet for subsequent purification operations. The filtered catalyst continuously settles at the bottom of the vertical pipe and each coarse filter chamber. The discharge valve is opened periodically to send the catalyst into the storage chamber, completing the filtration and separation of the catalyst in the reaction product. In this invention, when the device reacts for a period of time, especially when the pressure difference is large, a portion of the filtered reaction product liquid can be sent into the return liquid chamber through the return liquid pipe. The liquid flows into each spray pipe and is then sprayed out from the spray holes, impacting the surrounding filter elements. This impacts the outer surface of the filter elements, dislodging any catalyst and polymers adhering to the surface, ensuring the filter elements are not clogged. This guarantees the normal filtration of the reaction products by the filter elements, allowing the device to operate normally, reducing the frequency of filter element maintenance and replacement, and lowering operating costs. Furthermore, in this invention, the device can operate normally while removing the adhering catalyst from the filter elements. While flushing off and removing the catalyst adhering to the filter element, filtration is performed simultaneously. In practice, the spray pipes can be grouped, with one or more groups activated at a time to clean the filter elements in batches, minimizing the impact of filter element cleaning on the filtration of reaction products. This method allows for online cleaning of the filter elements without stopping normal equipment operation. Furthermore, when filtering reaction products, this invention first introduces them into the coarse filter chamber for multiple coarse filtrations through a filter screen, followed by fine filtration in the fine filter chamber. This improves filtration efficiency, reduces the workload on the filter element, and extends its service life. In summary, this invention offers advantages such as less clogging of the filter element, high working efficiency, and the ability to clean online. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0014] Figure 3 for Figure 1 A magnified structural diagram of node B in the middle;

[0015] In the diagram: 1-shell, 2-outlet, 3-return chamber, 4-cleaned chamber, 5-fine filtration chamber, 6-coarse filtration chamber, 7-storage chamber, 8-return pipe, 9-filter element, 10-spray pipe, 11-vertical pipe, 12-vertical plate, 13-filter screen, 14-coarse filtration chamber, 15-inlet, 16-outlet, 17-heating jacket, 18-horizontal mesh, 19-screen, 20-slag discharge port. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0017] like Figures 1-3 As shown, this utility model includes a housing 1 and a discharge port 2. The housing 1 is divided into a return liquid chamber 3, a clean liquid chamber 4, a fine filtration chamber 5, a coarse filtration chamber 6, and a storage chamber 7 from top to bottom by multiple partitions. A return liquid port is provided at the top of the housing 1, and a liquid outlet is provided on the side wall of the clean liquid chamber 4. The liquid outlet and the return liquid port are connected by a return liquid pipe 8. Several filter elements 9 are provided in the fine filtration chamber 5. The upper end of the filter elements 9 is connected to the clean liquid chamber 4. Several spray pipes 10 are provided between the filter elements 9. Several spray holes are evenly distributed on the spray pipes 10. The upper end of the spray pipes 10 is connected to the return liquid chamber 3. A vertical pipe 11 is concentrically arranged in the coarse filtration chamber 6. The upper end of the vertical pipe 11 is connected to the fine filtration chamber 5, and the lower end is connected to the storage chamber 7. The annular area between the vertical pipe 11 and the shell 1 is divided into several coarse filtration chambers 14 by a vertical plate 12 and several filter screens 13. A feed inlet 15 is provided on the side wall of the coarse filtration chamber 14 on one side of the vertical plate 12, and a liquid inlet is provided on the top of the coarse filtration chamber 14 on the other side of the vertical plate 12. A discharge port 16 is provided at the bottom of the vertical pipe 11 and each coarse filtration chamber 14. A discharge valve is provided on the discharge port 16, and the discharge outlet 2 is provided on the storage chamber 7.

[0018] This invention is used for the filtration and separation of catalysts in the hydrogenation process of maleic anhydride. During operation, the reaction product containing the catalyst enters the coarse filter chamber 6 through the feed inlet 15, and then flows through each coarse filter chamber 14 in sequence. After multiple filtrations by the filter screen 13, the catalyst particles with larger sizes in the reaction product are filtered out. The remaining reaction product, carrying the catalyst, enters the fine filter chamber 5 and flows from the outside of the filter element 9 to the inside of the filter element 9. The catalyst is intercepted on the outer wall of the filter element 9 tube and falls continuously, completing the fine filtration process of the catalyst in the reaction product, and obtaining a relatively pure reaction product without catalyst. The reaction product flows from the inside of the filter element 9 tube into the clean liquid chamber 4 and is discharged from the outlet for subsequent purification and other operations. The filtered catalyst continuously deposits at the bottom of the vertical pipe 11 and each coarse filter chamber 14. The discharge valve is opened periodically to send the catalyst into the storage chamber 7, completing the filtration and separation of the catalyst in the reaction product.

[0019] In this invention, when the device reacts for a period of time, especially when the pressure difference is large, a portion of the filtered reaction product liquid can be sent into the return liquid chamber 3 through the return liquid pipe 8. The liquid flows into each spray pipe 10 and is then sprayed out from the spray holes, impacting the surrounding filter elements 9. This impacts the outer surface of the filter elements 9, dislodging any catalyst and polymers adhering to their surfaces, ensuring that the filter elements 9 are not clogged. This guarantees the normal filtration of the reaction products by the filter elements 9, allowing the device to operate normally, reducing the frequency of filter element maintenance and replacement, and lowering operating costs. Furthermore, in this invention, the device can operate normally while removing the adhering catalyst from the filter elements 9. While flushing off and removing the catalyst adhering to the filter element 9, filtration is carried out simultaneously. In specific implementation, the spray pipes 10 can also be grouped, with one or several groups turned on at a time to clean the filter element 9 in batches, minimizing the impact of filter element 9 cleaning on the filtration of reaction products. Through the above method, the filter element 9 can be backwashed without stopping the normal operation of the equipment, realizing online cleaning of the filter element 9. In addition, when filtering reaction products, this utility model first passes the reaction products into the coarse filter chamber 6, where they undergo multiple coarse filtrations through the filter screen 13, and then into the fine filter chamber 5 for fine filtration, which improves filtration efficiency, reduces the workload of the filter element 9, and extends the service life of the filter element 9.

[0020] The mesh diameter of the filter screen 13 gradually decreases along the liquid flow direction. When this utility model is running, the reaction products first enter the coarse filtration chamber 6 and are coarsely filtered multiple times using the filter screen 13. Since the mesh diameter of the filter screen 13 gradually decreases along the liquid flow direction, larger particles in the reaction products can be filtered out first, and then smaller particles can be filtered out in sequence to perform graded filtration and improve the filtration efficiency of the reaction products.

[0021] Heating jackets 17 are installed on the outer walls of the fine filtration chamber 5, the coarse filtration chamber 6, and the storage chamber 7. Considering that the reaction products have a certain viscosity, high viscosity will affect the filtration effect of the device and increase the probability of clogging of the filter element 9 and the filter screen 13. Therefore, heating jackets 17 are installed on the outer walls of the fine filtration chamber 5, the coarse filtration chamber 6, and the storage chamber 7. During implementation, heating media such as steam or hot oil are introduced into the heating jackets 17 to heat and keep the reaction products in the shell 1 warm, reduce the viscosity of the reaction products, improve the flowability of the reaction products, thereby improving the filtration efficiency and reducing the probability of clogging of the filter element 9.

[0022] The spray nozzle is tilted downwards, and the backwash liquid is sprayed out from the spray nozzle to wash off the catalyst attached to the filter element 9. The downward spray of the liquid can make the washed-off catalyst settle downwards more quickly. At the same time, the downward tilted jet has a larger contact area with the surface of the filter element 9, which can wash a larger area of ​​the filter element 9 surface at the same time, improving the cleaning efficiency of the filter element 9.

[0023] A horizontal mesh 18 is provided on the liquid inlet. When this utility model is in operation, the reaction product first enters the coarse filtration chamber 6. After multiple coarse filtrations, it enters the fine filtration chamber 5 through the liquid inlet for further filtration. The horizontal mesh 18 on the liquid inlet can filter the reaction product again, thereby improving the filtration efficiency.

[0024] A screen 19 is inclinedly arranged inside the storage chamber 7, and the discharge port 2 is located above the lower end of the screen 19. A slag discharge port 20 is provided at the bottom of the storage chamber 7. In this utility model, the filtered catalyst falls into the storage chamber 7 through the discharge port 16. The screen 19 has two functions: first, to screen out catalyst fragments and slag, and second, to filter out reaction products, so as to obtain a relatively pure catalyst, which is convenient for subsequent processing and reuse.

Claims

1. A maleic anhydride hydrogenation catalyst filtration and separation device, comprising a shell (1) and a discharge port (2), characterized in that: The housing (1) is divided into a return liquid chamber (3), a clean liquid chamber (4), a fine filtration chamber (5), a coarse filtration chamber (6), and a storage chamber (7) by multiple partitions from top to bottom. A return liquid port is provided at the top of the housing (1), and an outlet is provided on the side wall of the clean liquid chamber (4). The outlet and the return liquid port are connected by a return liquid pipe (8). Several filter elements (9) are provided in the fine filtration chamber (5). The upper end of the filter element (9) is connected to the clean liquid chamber (4). Several spray pipes (10) are provided between the filter elements (9). Several spray holes are evenly distributed on the spray pipes (10). The upper end of the spray pipes (10) is connected to the return liquid chamber (3). The coarse filtration chamber (6) is... A vertical pipe (11) is arranged concentrically. The upper end of the vertical pipe (11) is connected to the fine filtration chamber (5), and the lower end is connected to the storage chamber (7). The annular area between the vertical pipe (11) and the shell (1) is divided into several coarse filtration chambers (14) by a vertical plate (12) and several filter screens (13). A feed inlet (15) is provided on the side wall of the coarse filtration chamber (14) on one side of the vertical plate (12), and a liquid inlet is provided on the top of the coarse filtration chamber (14) on the other side of the vertical plate (12). A discharge port (16) is provided at the bottom of the vertical pipe (11) and each coarse filtration chamber (14). A discharge valve is provided on the discharge port (16), and the discharge outlet (2) is provided on the storage chamber (7).

2. The maleic anhydride hydrogenation catalyst filtration and separation device according to claim 1, characterized in that: The mesh diameter of the filter (13) gradually decreases along the liquid flow direction.

3. The maleic anhydride hydrogenation catalyst filtration and separation device according to claim 1, characterized in that: Heating jackets (17) are provided on the outer walls of the fine filtration chamber (5), coarse filtration chamber (6) and storage chamber (7).

4. The maleic anhydride hydrogenation catalyst filtration and separation device according to claim 1, characterized in that: The spray nozzle is angled downwards.

5. The maleic anhydride hydrogenation catalyst filtration and separation device according to claim 1, characterized in that: A horizontal mesh (18) is provided on the upper liquid inlet.

6. The maleic anhydride hydrogenation catalyst filtration and separation device according to claim 1, characterized in that: A screen (19) is inclinedly arranged inside the storage cavity (7), the discharge port (2) is located above the lower end of the screen (19), and a slag discharge port (20) is provided at the bottom of the storage cavity (7).

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