Benzene hydrogenation catalyst filtering and recycling device

Abstract

In order to overcome the defects in the prior art, the utility model provides a benzene hydrogenation catalyst filtering and recycling device which comprises a hydrogenation catalyst precision filter. The inlet end of the hydrogenation catalyst precision filter is communicated with the dehydrating tower feed cooler, the filtrate outlet end is communicated with the inlet end of the dehydrating tower return tank, and the slag discharge port end is communicated with the inlet end of the oil-water separation tank. The oil phase outlet end of the oil-water separation tank is communicated with the inlet end of the dehydrating tower return tank, and the water phase outlet end of the oil-water separation tank is communicated with the inlet end of the hydrogenation catalyst collection tank. And the outlet end of the hydrogenation catalyst collecting tank is communicated with the hydrogenation catalyst water-phase cross-flow high-precision filter. And the hydrogenation catalyst water-phase cross-flow high-precision filter is used for concentrating the catalyst recovery liquid in the hydrogenation catalyst collection tank. And the outlet end of the hydrogenation catalyst filtrate collecting tank is connected with a backwashing pipeline. According to the utility model, the oil-phase dead-section precision filter and the water-phase cross-flow filter are respectively adopted to filter and recover the catalyst.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production equipment, in particular to a benzene hydrogenation catalyst filtration and recovery device. Background Art

[0002] After benzene and hydrogen react in a hydrogenation reactor under the catalysis of a ruthenium-zinc slurry catalyst in the benzene partial hydrogenation system of a cyclohexene process cyclohexanol device, the reaction oil phase and the aqueous-phase catalyst slurry are separated in a hydrogenation settler. The catalyst slurry returns to the first hydrogenation reactor to continue participating in the reaction, and the reaction oil phase overflows to a flash tank to flash off hydrogen and then is sent to a dehydration tower. During daily operation, a small amount of hydrogenation catalyst is lost with the reaction oil phase to the post-treatment system. A small amount of the hydrogenation catalyst deposited after loss is discharged during the daily drainage operation at the bottom of the flash tank. In the hydrogenation post-treatment system, the water pocket of the reflux tank of the dehydration tower is drained to the wastewater treatment section, and a part of the hydrogenation catalyst is also entrained in the drainage of the degassing tower in the hydrogenation catalyst regeneration section and discharged to the wastewater treatment section. A small amount of gray hydrogenation catalyst is also present during the daily cleaning of the filter screen of the wastewater pump. The lost catalyst finally enters the wastewater system and is sent to the biochemical treatment, which on the one hand causes the loss of expensive catalysts and on the other hand causes an impact on the biochemical system.

[0003] At present, the problem of catalyst loss has not been solved in similar domestic and foreign devices. Only a 60-mesh basket filter is added at the outlet of the flash tank. Since the particle size of the hydrogenation catalyst is at the nanometer level, the filter screen with conventional precision cannot filter and intercept it, and the problem of catalyst loss has not been fundamentally solved. Content of the Utility Model

[0004] To solve the deficiencies of the existing technology, the utility model provides a benzene hydrogenation catalyst filtration and recovery device, including: a hydrogenation catalyst precision filter, an oil-water separation tank, a hydrogenation catalyst collection tank, a hydrogenation catalyst aqueous-phase cross-flow high-precision filter, and a hydrogenation catalyst filtrate collection tank.

[0005] The liquid-phase inlet end of the hydrogenation catalyst precision filter is communicated with the outlet end of the dehydration tower feed cooler through a ninth connecting pipe, and the filtrate outlet end is communicated with the inlet end of the dehydration tower reflux tank through a first connecting pipe. The slag discharge port end is communicated with the inlet end of the oil-water separation tank through a second connecting pipe.

[0006] The oil-phase outlet end of the oil-water separation tank is communicated with the inlet end of the dehydration tower reflux tank through a third connecting pipe, and the water-phase outlet end is communicated with the inlet end of the hydrogenation catalyst collection tank through a fourth connecting pipe.

[0007] The outlet end of the hydrogenation catalyst collection tank is communicated with the water inlet end of the hydrogenation catalyst aqueous-phase cross-flow high-precision filter through a fifth connecting pipe. A catalyst concentrated liquid discharge pipeline is arranged at the lower end of the hydrogenation catalyst collection tank.

[0008] The concentrated water outlet end of the high-precision cross-flow water-phase hydrogenation catalyst filter is connected to the inlet end of the hydrogenation catalyst collection tank through a sixth connecting pipe, and the filtrate outlet end is connected to the inlet end of the hydrogenation catalyst filtrate collection tank through a seventh connecting pipe.

[0009] The outlet end of the hydrogenation catalyst filtrate collection tank is connected to the backwashing pipeline. The first backwashing branch pipeline of the backwashing pipeline is communicated with the backwashing interface of the high-precision cross-flow water-phase hydrogenation catalyst filter, and the second backwashing branch pipeline is communicated with a tee mechanism between the filtrate outlet end of the hydrogenation catalyst precision filter and the first connecting pipe.

[0010] Further, there are two or more hydrogenation catalyst precision filters, and at least one of them is in an open state.

[0011] Further, there are at least two high-precision cross-flow water-phase hydrogenation catalyst filters. The concentrated water outlet end of the high-precision cross-flow water-phase hydrogenation catalyst filter connected to the fifth connecting pipe is communicated with the water inlet end of the adjacent high-precision cross-flow water-phase hydrogenation catalyst filter. The water inlet ends of the remaining high-precision cross-flow water-phase hydrogenation catalyst filters are communicated with the concentrated water outlet end of another high-precision cross-flow water-phase hydrogenation catalyst filter. The concentrated water outlet end of the last high-precision cross-flow water-phase hydrogenation catalyst filter is connected to the inlet end of the hydrogenation catalyst collection tank through a sixth connecting pipe.

[0012] Further, the low end of the sixth connecting pipe is communicated with the inlet end of the hydrogenation catalyst collection tank through an eighth connecting pipe.

[0013] Further, the dehydration tower reflux tank is a dehydration tower reflux tank with an oil-water separation function. The oil phase outlet end of the dehydration tower reflux tank is communicated with the inlet end of the dehydration tower, and the water phase outlet end is communicated with the hydrogenation catalyst collection tank.

[0014] Further, the wastewater outlet end of the degassing tower is communicated with the inlet end of the degassing tower oil-water separation tank. The oil phase outlet end of the degassing tower oil-water separation tank is connected to the wastewater treatment section, and the water phase outlet end is connected to the inlet end of the hydrogenation catalyst collection tank.

[0015] Further, the hydrogenation catalyst precision filter is provided with a metal sintered filter element with a single-cylinder multi-branch structure of 0.5-1 micron. The metal sintered filter elements are arranged in groups inside the hydrogenation catalyst precision filter.

[0016] Further, the high-precision cross-flow water-phase hydrogenation catalyst filter is provided with a ceramic membrane filter of 0.1 micron, and the ceramic membrane filter is provided with a filter element with a membrane flow rate of 2-3 m / s and a conical seal.

[0017] Further, the hydrogenation catalyst precision filters are respectively communicated with a low-pressure nitrogen gas pipeline and a low-pressure steam pipeline.

[0018] The beneficial effects of the present utility model are as follows:

[0019] 1. According to the characteristics that the discharged substances at different positions will carry out the catalyst, the dead-end precision filter for the oil phase and the cross-flow filter for the water phase are respectively adopted in the present utility model. Different precision filter forms and process routes are used for filtration and recovery. After the ruthenium hydrogenation catalyst intercepted by filtration is processed and collected in the hydrogenation catalyst collection tank, it is used for the recovery of precious metal ruthenium to prepare a new hydrogenation catalyst, reducing the procurement cost of the hydrogenation catalyst in the cyclohexanol plant.

[0020] 2. The present utility model solves the problem that a very large filtration area is required for the filtration flux to meet the normal production demand.

[0021] 3. The present utility model combines some of the original post-treatment equipment. Therefore, the overall investment of the system is small, and it can meet the production needs. It not only recovers the expensive catalyst but also solves the impact and influence of the catalyst on the wastewater system and the biochemical system.

[0022] 4. The present utility model adds a backwashing function, which can backwash the hydrogenation catalyst precision filter and the hydrogenation catalyst water-phase cross-flow high-precision filter, thereby extending the operation cycle of the filter. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the benzene hydrogenation catalyst filtration and recovery device of the present utility model;

[0024] Figure 2 It is a schematic structural diagram of an oil-phase precision filter for a hydrogenation catalyst of the present utility model;

[0025] Figure 3 It is a schematic layout diagram of the metal sintered filter element of an oil-phase precision filter for a hydrogenation catalyst of the present utility model;

[0026] Figure 4 It is a schematic structural diagram of a water-phase cross-flow high-precision filter for a hydrogenation catalyst of the present utility model;

[0027] In the figure: 1. Feed cooler of dehydration tower; 2. Precision filter for hydrogenation catalyst; 201. Sintered metal filter element; 3. Oil-water separation tank; 301. Third connecting pipe; 302. Fourth connecting pipe; 4. Collection tank for hydrogenation catalyst; 401. Catalyst concentrated liquid discharge pipeline; 5. High-precision cross-flow water-phase filter for hydrogenation catalyst; 501. Filter element; 6. Collection tank for filtrate of hydrogenation catalyst; 7. Reflux tank of dehydration tower; 8. Oil-water separation tank of degassing tower; 9. Degassing tower; 10. Ninth connecting pipe; 11. Second connecting pipe; 12. Fifth connecting pipe; 13. Sixth connecting pipe; 14. Backwashing pipeline; 1401. First backwashing branch pipeline; 1402. Second backwashing branch pipeline; 15. Low-pressure nitrogen gas pipeline; 16. Low-pressure steam pipeline; 17. Seventh connecting pipe; 18. Eighth connecting pipe; 19. First connecting pipe; 20. Wastewater treatment section; 21. Dehydration tower. Detailed implementation mode

[0028] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0029] Please note that the "upper", "lower", "left", "right", "top", "top end", "bottom end", "bottom" and other terms used by the present utility model to describe the positional relationship do not represent the absolute positional relationship between each module / component / assembly / part / element, but the relative positional relationship between each module / component / assembly / part / element.

[0030] Embodiment 1

[0031] A benzene hydrogenation catalyst filtration and recovery device, as Figure 1 shown, includes: precision filter 2 for hydrogenation catalyst, oil-water separation tank 3, collection tank 4 for hydrogenation catalyst, high-precision cross-flow water-phase filter 5 for hydrogenation catalyst, and collection tank 6 for filtrate of hydrogenation catalyst.

[0032] The liquid-phase inlet end of the precision filter 2 for hydrogenation catalyst is communicated with the outlet end of the feed cooler 1 of the dehydration tower through the ninth connecting pipe 10, and the filtrate outlet end is communicated with the inlet end of the reflux tank 7 of the dehydration tower through the first connecting pipe 19. The slag discharge port end is communicated with the inlet end of the oil-water separation tank 3 through the second connecting pipe 11.

[0033] The oil-phase outlet end of the oil-water separation tank 3 is communicated with the inlet end of the reflux tank 7 of the dehydration tower through the third connecting pipe 301, and the water-phase outlet end is communicated with the inlet end of the collection tank 4 for hydrogenation catalyst through the fourth connecting pipe 302.

[0034] The outlet end of the hydrogenation catalyst collection tank 4 is communicated with the water inlet end of the high-precision hydrogenation catalyst water cross-flow filter 5 through a fifth connecting pipe 12. A catalyst concentrated liquid discharge pipeline 401 is provided at the lower end of the hydrogenation catalyst collection tank 4.

[0035] The concentrated water outlet end of the high-precision hydrogenation catalyst water cross-flow filter 5 is connected to the inlet end of the hydrogenation catalyst collection tank 4 through a sixth connecting pipe 13, and the filtrate outlet end is connected to the inlet end of the hydrogenation catalyst filtrate collection tank 6 through a seventh connecting pipe 17.

[0036] The outlet end of the hydrogenation catalyst filtrate collection tank 6 is connected to a backwashing pipeline 14. The first backwashing branch pipeline 1401 of the backwashing pipeline 14 is communicated with the backwashing interface of the high-precision hydrogenation catalyst water cross-flow filter 5, and the second backwashing branch pipeline 1402 is communicated with the filtrate outlet end of the high-precision hydrogenation catalyst filter 2 and the first connecting pipe 19 through a tee mechanism.

[0037] The usage process of this device is as follows: The waste liquid containing ruthenium hydrogenation catalyst in the feed cooler 1 of the original post-hydrogenation treatment system enters the high-precision hydrogenation catalyst filter 2. After the first oil phase filtration is completed in the high-precision hydrogenation catalyst filter 2, by controlling the tee mechanism to connect the filtrate outlet end of the high-precision hydrogenation catalyst filter 2 and the first connecting pipe 19, the oil phase filtrate containing the catalyst enters the dehydration tower reflux tank 7 in the original post-hydrogenation treatment system, and the water phase filter residue liquid containing the catalyst enters the oil-water separation tank 3. The oil-water separation tank 3 separates the oil and water in the filter residue liquid of the high-precision hydrogenation catalyst filter 2. The water phase part enters the hydrogenation catalyst collection tank 4, and the oil phase part enters the dehydration tower reflux tank 7 in the original post-hydrogenation treatment system. This dehydration tower reflux tank 7 is connected to the original dehydration tower 21 for rectification operation to recover the catalyst in the oil phase. The liquid phase at the bottom of the hydrogenation catalyst collection tank 4 is pumped into the high-precision hydrogenation catalyst water cross-flow filter 5 by a circulation pump, and the second water phase filtration is completed in the high-precision hydrogenation catalyst water cross-flow filter 5. The concentrated liquid generated by the high-precision hydrogenation catalyst water cross-flow filter 5 enters the hydrogenation catalyst collection tank 4, and a part of the filtrate enters the hydrogenation catalyst filtrate collection tank 6. By continuously filtering and concentrating the liquid phase components in the hydrogenation catalyst collection tank 4 through the high-precision hydrogenation catalyst water cross-flow filter 5, the catalyst recovery liquid circulating into the hydrogenation catalyst collection tank 4 can be gradually concentrated. When the catalyst concentration in the hydrogenation catalyst collection tank 4 is relatively high, it is discharged into a special barrel through the catalyst concentrated liquid discharge pipeline 401, and then the clear liquid is removed after precipitation for catalyst ruthenium recovery.

[0038] When backwashing is required, control the three-way mechanism to connect the filtrate outlet end of the hydrogenation catalyst precision filter 2 and the second backwashing branch pipeline 1402, and then start the circulation pump at the outlet end of the hydrogenation catalyst filtrate collection tank 6 to pump the filtrate recovered by the hydrogenation catalyst filtrate collection tank 6 into the backwashing pipeline 14. Enter the backwashing interface of the hydrogenation catalyst aqueous cross-flow high-precision filter 5 from the first backwashing branch pipeline 1401 to backwash the filter element of the hydrogenation catalyst aqueous cross-flow high-precision filter 5. Enter the filtrate outlet end of the hydrogenation catalyst precision filter 2 from the second backwashing branch pipeline 1402 to backwash the filter element of the hydrogenation catalyst precision filter 2. The backwashing liquid for flushing the hydrogenation catalyst precision filter 2 enters the oil-water separation tank 3 through the second connecting pipe 11 and then enters the hydrogenation catalyst collection tank 4, and enters the hydrogenation catalyst aqueous cross-flow high-precision filter 5 through the fifth connecting pipe 12, and together with the backwashing liquid of the hydrogenation catalyst aqueous cross-flow high-precision filter 5, returns to the hydrogenation catalyst filtrate collection tank 6 from the filtrate outlet end of the hydrogenation catalyst aqueous cross-flow high-precision filter 5 through the seventh connecting pipe 17.

[0039] According to the characteristics that the discharged substances at different positions will carry out catalysts, the present utility model respectively adopts a dead-end precision filter for the oil phase and a cross-flow filter for the water phase, and uses different precision filter forms and process routes for filtration and recovery. After the ruthenium hydrogenation catalyst intercepted by filtration is processed and collected in the hydrogenation catalyst collection tank, it is used for the recovery of precious metal ruthenium to prepare a new hydrogenation catalyst, reducing the procurement cost of the hydrogenation catalyst in the cyclohexanol device.

[0040] The present utility model solves the problem that a very large filtration area is required for the filtration flux to meet the normal production demand.

[0041] The present utility model combines some of the original post-treatment equipment, so the overall investment of the system is small, and it can meet the production needs. It not only recovers the expensive catalyst, but also solves the impact and influence of the catalyst on the wastewater system and the biochemical system.

[0042] The present utility model adds a backwashing function, which can backwash the hydrogenation catalyst precision filter and the hydrogenation catalyst aqueous cross-flow high-precision filter, thereby extending the operation cycle of the filter.

[0043] After the implementation of this solution, by recovering the precious metal ruthenium in the hydrogenation catalyst, considerable economic benefits can be generated, and the operation cycle of the wastewater system is effectively extended, making the device production more stable.

[0044] Embodiment 2

[0045] Based on the benzene hydrogenation catalyst filtration and recovery device of Embodiment 1, as Figure 1 shown, two or more hydrogenation catalyst precision filters 2 are provided, and at least one of them is in an open state. For exampleFigure 1 Among the three units shown, two are in the startup state and one is in the maintenance state. This setting can start the corresponding number of precision filters for hydrogenation catalysts 2 in a timely manner according to the drainage volume of the feed cooler 1 of the dehydration tower, so as to meet the processing flow requirements.

[0046] Example 3

[0047] Based on the benzene hydrogenation catalyst filtration and recovery device of Example 1, as Figure 1 shown, there are at least two high-precision cross-flow water-phase filters 5 for hydrogenation catalysts. The concentrated water outlet end of the high-precision cross-flow water-phase filter 5 for hydrogenation catalysts connected to the fifth connecting pipe 12 communicates with the water inlet end of the adjacent high-precision cross-flow water-phase filter 5 for hydrogenation catalysts. The water inlet ends of the remaining high-precision cross-flow water-phase filters 5 for hydrogenation catalysts communicate with the concentrated water outlet ends of another high-precision cross-flow water-phase filter 5 for hydrogenation catalysts. The concentrated water outlet end of the last high-precision cross-flow water-phase filter 5 for hydrogenation catalysts is connected to the inlet end of the hydrogenation catalyst collection tank 4 through the sixth connecting pipe 13. For example Figure 1 among the two units shown, the fifth connecting pipe 12 is connected to the left high-precision cross-flow water-phase filter 5 for hydrogenation catalysts. The concentrated water outlet end of the left high-precision cross-flow water-phase filter 5 for hydrogenation catalysts communicates with the water inlet end of the right high-precision cross-flow water-phase filter 5 for hydrogenation catalysts. The concentrated water outlet end of the right high-precision cross-flow water-phase filter 5 for hydrogenation catalysts is connected to the inlet end of the hydrogenation catalyst collection tank 4 through the sixth connecting pipe 13.

[0048] This setting can significantly increase the concentration efficiency of the catalyst recovery liquid in the hydrogenation catalyst collection tank 4 by increasing the number of high-precision cross-flow water-phase filters 5 for hydrogenation catalysts, thereby reducing the number of cycles and improving the recovery efficiency.

[0049] Example 4

[0050] Based on the benzene hydrogenation catalyst filtration and recovery device of Example 1, as Figure 1 shown, the lower end of the sixth connecting pipe 13 is connected to the inlet end of the hydrogenation catalyst collection tank 4 through the eighth connecting pipe 18. This setting can recover the residual liquid in the sixth connecting pipe 13 to the hydrogenation catalyst collection tank 4 before system maintenance and repair.

[0051] Example 5

[0052] Based on the benzene hydrogenation catalyst filtration and recovery device of Example 1, as Figure 1As shown, the reflux drum 7 of the dehydration tower is a reflux drum of the dehydration tower with an oil-water separation function. The oil-phase outlet end of the reflux drum 7 of the dehydration tower is communicated with the inlet end of the dehydration tower 21, and the water-phase outlet end is communicated with the hydrogenation catalyst collection tank 4. This setting can further separate the water-phase components in the oil-phase components filtered by the hydrogenation catalyst fine filter 2, so that these water-phase components containing the catalyst can enter the hydrogenation catalyst collection tank 4 for concentrating and collecting the catalyst.

[0053] Example 6

[0054] Based on the benzene hydrogenation catalyst filtration and recovery device of Example 1, as Figure 1 shown, the wastewater outlet end of the degassing tower 9 is communicated with the inlet end of the degassing tower oil-water separation tank 8. The oil-phase outlet end of the degassing tower oil-water separation tank 8 is connected to the wastewater treatment section 20, and the water-phase outlet end is connected to the inlet end of the hydrogenation catalyst collection tank 4.

[0055] This setting enables the wastewater generated by the degassing tower in the original hydrogenation catalyst regeneration process to be separated by the degassing tower oil-water separation tank 8, so that the water phase containing the catalyst therein enters the hydrogenation catalyst collection tank 4 for catalyst concentration and recovery operations.

[0056] The present utility model exemplarily provides a hydrogenation catalyst fine filter 2, as Figure 2 shown, the hydrogenation catalyst fine filter 2 is provided with a metal sintered filter element 201 having a single-tube multi-branch structure with a size of 0.5 - 1 micron. The metal sintered filter element 201 is arranged in groups inside the hydrogenation catalyst fine filter 2. As Figure 3 shown, the metal sintered filter element 201 has a tube sheet type, and the metal sintered filter element 201 is integrally installed and withdrawn. The metal sintered filter element 201 adopts a top-mounted structure, the sealing gasket is made of RPTFE material, the upper end of the metal sintered filter element 201 is connected to the tube sheet by threads, sealed with a PTFE O-ring, and the lower end is fixed with an anti-loosening plate to prevent the filter element from loosening. The upper head of the equipment is provided with a rotating shaft for convenient disassembly and assembly.

[0057] The present utility model exemplarily provides a hydrogenation catalyst water-phase cross-flow high-precision filter 5, as Figure 4 shown, the hydrogenation catalyst water-phase cross-flow high-precision filter 5 is provided with a ceramic membrane filter with a size of 0.1 micron. The ceramic membrane filter is provided with a membrane flow rate of 2 - 3 m / s and a conical-sealed filter element 501. There is an anti-flushing pipe orifice for regular backwashing, and the upper and lower parts adopt a detachable tube sheet structure.

[0058] According to an embodiment of the present utility model, as Figure 1As shown, the hydrogenation catalyst fine filter 2 is respectively connected to the low-pressure nitrogen gas pipeline 15 and the low-pressure steam pipeline 16. Low-pressure nitrogen gas and low-pressure steam can be introduced into the hydrogenation catalyst fine filter 2 when needed to perform the filter cleaning operation.

[0059] Inspired by the above ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A benzene hydrogenation catalyst filtration and recovery device, characterized in that, Including: Precision filter for hydrogenation catalyst (2), oil-water separation tank (3), hydrogenation catalyst collection tank (4), high-precision cross-flow water-phase filter for hydrogenation catalyst (5), filtrate collection tank for hydrogenation catalyst (6); The liquid-phase inlet end of the precision filter for hydrogenation catalyst (2) is communicated with the outlet end of the feed cooler of the dehydration tower (1) through the ninth connecting pipe (10), and the filtrate outlet end is communicated with the inlet end of the reflux tank of the dehydration tower (7) through the first connecting pipe (19); the slag discharge port end is communicated with the inlet end of the oil-water separation tank (3) through the second connecting pipe (11); The oil-phase outlet end of the oil-water separation tank (3) is communicated with the inlet end of the reflux tank of the dehydration tower (7) through the third connecting pipe (301), and the water-phase outlet end is communicated with the inlet end of the hydrogenation catalyst collection tank (4) through the fourth connecting pipe (302); The outlet end of the hydrogenation catalyst collection tank (4) is communicated with the water inlet end of the high-precision cross-flow water-phase filter for hydrogenation catalyst (5) through the fifth connecting pipe (12); a catalyst concentrated liquid discharge pipeline (401) is arranged at the lower end of the hydrogenation catalyst collection tank (4); The concentrated water outlet end of the high-precision cross-flow water-phase filter for hydrogenation catalyst (5) is connected to the inlet end of the hydrogenation catalyst collection tank (4) through the sixth connecting pipe (13), and the filtrate outlet end is connected to the inlet end of the filtrate collection tank for hydrogenation catalyst (6) through the seventh connecting pipe (17); The outlet end of the filtrate collection tank for hydrogenation catalyst (6) is connected to the backwashing pipeline (14); the first backwashing branch line (1401) of the backwashing pipeline (14) is communicated with the backwashing interface of the high-precision cross-flow water-phase filter for hydrogenation catalyst (5), and the second backwashing branch line (1402) is communicated with a tee mechanism between the filtrate outlet end of the precision filter for hydrogenation catalyst (2) and the first connecting pipe (19).

2. The benzene hydrogenation catalyst filtration and recovery device according to claim 1, characterized in that There are two or more precision filters for hydrogenation catalyst (2), and at least one of them is in an open state.

3. The benzene hydrogenation catalyst filtration and recovery device according to claim 1, characterized in that There are at least two high-precision cross-flow water-phase filters for hydrogenation catalyst (5). The concentrated water outlet end of the high-precision cross-flow water-phase filter for hydrogenation catalyst (5) connected to the fifth connecting pipe (12) is communicated with the water inlet end of the adjacent high-precision cross-flow water-phase filter for hydrogenation catalyst (5); the water inlet ends of the remaining high-precision cross-flow water-phase filters for hydrogenation catalyst (5) are communicated with the concentrated water outlet end of another high-precision cross-flow water-phase filter for hydrogenation catalyst (5); the concentrated water outlet end of the last high-precision cross-flow water-phase filter for hydrogenation catalyst (5) is connected to the inlet end of the hydrogenation catalyst collection tank (4) through the sixth connecting pipe (13).

4. The benzene hydrogenation catalyst filtration and recovery device according to claim 1, characterized in that, The lower end of the sixth connecting pipe (13) is communicated with the inlet end of the hydrogenation catalyst collection tank (4) through the eighth connecting pipe (18).

5. The benzene hydrogenation catalyst filtration and recovery device according to claim 1, characterized in that, The reflux tank of the dehydration tower (7) is a reflux tank of the dehydration tower with an oil-water separation function. The oil-phase outlet end of the reflux tank of the dehydration tower (7) is communicated with the inlet end of the dehydration tower (21), and the water-phase outlet end is communicated with the hydrogenation catalyst collection tank (4).

6. The benzene hydrogenation catalyst filtration and recovery device according to claim 1, characterized in that The wastewater outlet end of the degassing tower (9) is communicated with the inlet end of the degassing tower oil-water separation tank (8); the oil phase outlet end of the degassing tower oil-water separation tank (8) is connected to the wastewater treatment section (20), and the water phase outlet end is connected to the inlet end of the hydrogenation catalyst collection tank (4).

7. The benzene hydrogenation catalyst filtration and recovery device according to claim 1, wherein The hydrogenation catalyst precision filter (2) is provided with a metal sintered filter element with a single-tube multi-branch structure of 0.5 - 1 micron; the metal sintered filter elements are arranged in groups inside the hydrogenation catalyst precision filter (2).

8. The benzene hydrogenation catalyst filtration and recovery device according to claim 1, characterized in that, The hydrogenation catalyst water phase cross-flow high-precision filter (5) is provided with a ceramic membrane filter of 0.1 micron, and the ceramic membrane filter is internally provided with a filter element with a membrane flow rate of 2 - 3 m / s and a conical seal.

9. The benzene hydrogenation catalyst filtration and recovery device according to claim 1, characterized in that, The hydrogenation catalyst precision filter (2) is respectively communicated with the low-pressure nitrogen gas pipeline (15) and the low-pressure steam pipeline (16).

Images