Membrane filtration device for separating waste catalyst in hydrogenation liquid

Abstract

The invention relates to the technical field of membrane filtration equipment, and discloses a membrane filtration device for separating a waste catalyst in a hydrogenation liquid, the equipment works by a filtration tank, a first filtration membrane, a second filtration membrane and a third filtration membrane which are rotatable in the filtration tank, and a transmission mechanism for driving the first filtration membrane, the second filtration membrane and the third filtration membrane to rotate; particles with different particle sizes are intercepted step by step through three stages of filter membranes, rotary motion effectively prevents filter membrane pores from being blocked, pressure difference rising is delayed, solid-liquid separation efficiency can be enhanced through the centrifugal effect, static deposition of filter cake layers on the surfaces of the filter membranes is reduced through a dynamic filter mode, the filter flux is remarkably improved, the service life of the filter membranes is prolonged, and the service life of the filter membranes is prolonged. Finally, the stability and the treatment efficiency of the filtering system in the continuous production process are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of membrane filtration equipment, in particular to a membrane filtration device for separating waste catalysts in hydrogenation liquid. Background Art

[0002] O-phenylenediamine, also known as 1,2-phenylenediamine, is a colorless monoclinic crystal at room temperature that darkens in air and sunlight. It is slightly soluble in cold water, soluble in hot water, and readily soluble in ethanol, ether, and chloroform. It reacts with inorganic acids to form water-soluble salts. It is an intermediate in dyes, pesticides, additives, and photosensitive materials. It is primarily used in the pesticide, pharmaceutical, rubber, and dye industries in the manufacture of polyamides, polyurethanes, carbendazim and thiophanate-methyl, vat scarlet GG, leveling agents, and antioxidant MB. It is also used in the preparation of developers and surfactants.

[0003] Industrial o-phenylenediamine is produced from 2-nitroaniline via sodium sulfide reduction or catalytic hydrogenation, or by direct amination reduction with 1,2-dichlorobenzene. Currently, the mainstream domestic production method is the alkali sulfide method, which, through alkali preparation, reduction, crystallization, centrifugation, melting, and distillation, yields only 70-80% and produces large amounts of wastewater and waste residue. Furthermore, the workshop environment is poor, the single-reactor reaction is complex, and production costs are high. The catalytic hydrogenation reduction method, in which the hydrogenation process is carried out in an autoclave at a reaction temperature of 95-105°C and a pressure of approximately 2 MPa, continuously introduces hydrogen in the presence of a catalyst, resulting in a reaction yield exceeding 97%. Only a small amount of water is produced, resulting in no other wastewater or waste residue pollution. The reaction is continuous and self-controlled, eliminating the need for alkali preparation, crystallization, and centrifugation.

[0004] Currently, the existing technology prepares o-phenylenediamine through the hydrogenation reduction method. After o-nitroaniline, hydrogen, and catalyst react in a hydrogenation kettle, the hydrogenation liquid enters a continuous settler to separate the catalyst and o-phenylenediamine. Most of the useful catalyst will be separated from the o-phenylenediamine during this process and pumped into the hydrogenation kettle through a catalyst recycling pump for recovery and reuse. However, a small amount of waste catalyst particles will still remain in the hydrogenation liquid, affecting product quality and stable operation of the system. The residual catalyst particles in the hydrogenation liquid need to be filtered to ensure product quality and stable operation of the system.

[0005] Therefore, we propose a membrane filtration device for separating waste catalyst from hydrogenation liquid to solve the problems in the above background. Summary of the Invention

[0006] The purpose of the present invention is to provide a membrane filtration device for separating waste catalyst from hydrogenation liquid, so as to solve the problem raised in the above background technology that a small amount of waste catalyst particles still remain in the hydrogenation liquid, affecting product quality and stable operation of the system.

[0007] To solve the above technical problems, the present invention provides the following technical solutions:

[0008] A membrane filtration device for separating waste catalysts in hydrogenation liquid, comprising a base. One end of the base is fixedly connected with a filtration tank for filtering waste catalysts in hydrogenation liquid. One end of the filtration tank is fixedly connected with a feed pipe for conveying hydrogenation liquid. Inside the filtration tank, a first filtration membrane, a second filtration membrane, and a third filtration membrane for multi-stage filtration of catalyst particles in hydrogenation liquid are rotatably connected. The pore sizes on the surfaces of the first filtration membrane, the second filtration membrane, and the third filtration membrane decrease in sequence. On one side of the first filtration membrane, the second filtration membrane, and the third filtration membrane, a transmission mechanism for driving their rotation is provided. At the bottom of the filtration tank, a liquid storage mechanism for storing the hydrogenation liquid after filtration is fixedly connected. Inside the filtration tank, a vibration mechanism for driving the first filtration membrane, the second filtration membrane, and the third filtration membrane to vibrate is provided. Inside the filtration tank, a cleaning brush for cleaning the first filtration membrane, the second filtration membrane, and the third filtration membrane is fixedly connected. On one side of the filtration tank, a catalyst discharging mechanism for discharging catalysts is provided.

[0009] The transmission mechanism includes a motor 1 fixedly connected to one side of the filtration tank. The output shaft of the motor 1 is fixedly connected with a transmission wheel. A gear for slowing down the rotation speed is meshed on the surface of the transmission wheel. Inside the filtration tank, a spline shaft is rotatably connected. The gear is fixedly connected to the surface of the spline shaft. One end of the spline shaft is slidably connected with a mounting plate, and the mounting plate is slidably connected inside the filtration tank.

[0010] The first filtration membrane, the second filtration membrane, and the third filtration membrane are fixedly installed on the surface of the mounting plate for disassembling the first filtration membrane, the second filtration membrane, and the third filtration membrane, and the first filtration membrane, the second filtration membrane, and the third filtration membrane are all slidably connected inside the filtration tank.

[0011] The vibration mechanism includes a vibration rod fixedly connected to the inside of the filtration tank. One side of the mounting plate is fixedly connected with an annular corrugated plate, and one end of the vibration rod contacts the surface of the annular corrugated plate.

[0012] On one side of the first filtration membrane, the second filtration membrane, and the third filtration membrane, a spring for driving the first filtration membrane, the second filtration membrane, and the third filtration membrane to vibrate is fixedly connected, and one end of the spring is fixedly connected to the inside of the filtration tank.

[0013] The liquid storage mechanism includes a liquid storage tank fixedly connected to the discharge end of the filtration tank. One end of the liquid storage tank is fixedly connected with a discharge pipe for facilitating discharge. An electronic switch valve for controlling the discharge of the liquid storage tank is fixedly installed on the inner wall of the discharge pipe.

[0014] A motor 3 is fixedly connected to the bottom of the liquid storage tank. The output shaft of the motor 3 is fixedly connected with a stirring rod for stirring the hydrogenation liquid filtered inside the liquid storage tank, and the stirring rod is rotatably connected inside the liquid storage tank.

[0015] The catalyst discharging mechanism includes a cleaning frame fixedly connected inside the filtration tank. The cleaning frame is located inside the first filtration membrane, the second filtration membrane, and the third filtration membrane. A spiral discharging rod for driving the catalyst particles to discharge is rotatably connected inside the cleaning frame, and a cleaning hole is provided on one side of the cleaning frame.

[0016] One end of the spiral discharging rod is fixedly connected with a synchronous pulley. A second motor is fixedly installed on one side of the filtration tank, and the output shaft of the second motor is fixedly connected with one end of the synchronous pulley. The surface of the synchronous pulley is engaged with a synchronous belt for driving the synchronous pulley to rotate synchronously.

[0017] The cleaning brushes respectively contact the inner tops of the first filtration membrane, the second filtration membrane, and the third filtration membrane, and the first filtration membrane, the second filtration membrane, and the third filtration membrane are located above the cleaning frame.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0019] The present invention intercepts particulate matters with different particle sizes step by step through three - stage filtration membranes. The rotational movement not only effectively prevents the pores of the filtration membranes from being blocked and delays the increase of pressure difference, but also enhances the solid - liquid separation efficiency through centrifugal action. At the same time, the dynamic filtration mode reduces the static deposition of the filter cake layer on the surface of the filtration membranes, significantly improves the filtration flux and prolongs the service life of the filtration membranes, ultimately ensuring the stability and processing efficiency of the filtration system during the continuous production process.

[0020] Through the synergistic effect of the rotating filtration membranes and the automatic cleaning and slag - discharging system, the efficient recovery of catalyst particles and the continuous self - cleaning of the filtration system are realized. The cleaning brushes scrape the surface - deposited particles synchronously as the filtration membranes rotate, preventing pore blockage. The dropped particles are dynamically transported by the spiral discharging rod, and particles with different particle sizes are separated and recovered. The synchronous pulley drive system ensures the stable and continuous slag - discharging process, avoiding the efficiency loss caused by shutdown cleaning, improving the recovery rate of the catalyst, reducing the maintenance frequency of the filtration membranes, and further enhancing the automation degree and long - cycle operation ability of the filtration system.

[0021] Through the linkage design of the annular corrugated plate and the vibrating rod, combined with the spring reset mechanism, the dynamic vibration and cleaning synergistic effect of the multi - stage filtration membranes is realized. The rotating mounting plate drives the annular corrugated plate to periodically squeeze the vibrating rod, causing the filtration membranes to generate high - frequency vibrations during sliding, effectively shaking off the deeply - attached particles and loosening the filter cake layer, and cooperating with the cleaning brushes to synchronously scrape the surface impurities. The dual effects of vibration and cleaning significantly improve the dredging efficiency of the pores of the filtration membranes, prevent micropore blockage and reduce pressure - difference fluctuations, while enhancing the solid - liquid separation effect, further prolonging the service life of the filtration membranes, and ensuring that the filtration system can still maintain a stable flux and continuous cleaning ability under high load. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 Schematic diagram of the bottom structure of the present invention;

[0024] Figure 3 Schematic diagram of the three-dimensional sectional structure of the present invention;

[0025] Figure 4 Schematic diagram of the partial sectional structure inside the filter tank of the present invention;

[0026] Figure 5 Schematic diagram of the partial structure inside the filter tank of the present invention;

[0027] Figure 6 Schematic diagram of the overall sectional plane structure of the present invention;

[0028] Figure 7 For the present invention Figure 6 Enlarged structure diagram at position A in

[0029] Wherein: 1, base; 2, filter tank; 3, feed pipe; 4, first filter membrane; 5, second filter membrane; 6, third filter membrane; 7, cleaning brush; 8, motor 1; 9, transmission wheel; 10, gear; 11, mounting plate; 12, spline rod; 13, annular corrugated plate; 14, vibration rod; 15, liquid storage tank; 16, discharge pipe; 17, electronic switch valve; 18, motor 3; 19, stirring rod; 20, motor 2; 21, cleaning frame; 22, synchronous pulley; 23, synchronous belt; 24, spiral discharge rod; 25, spring. Specific embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1-7 , the present invention provides a technical solution:

[0032] Such as Figures 1-7As shown in the figure, a membrane filtration device for separating waste catalysts in hydrogenated liquid includes a base 1. One end of the base 1 is fixedly connected with a filtration tank 2 for filtering waste catalysts in hydrogenated liquid. One end of the filtration tank 2 is fixedly connected with a feed pipe 3 for conveying hydrogenated liquid. Inside the filtration tank 2, a first filtration membrane 4, a second filtration membrane 5, and a third filtration membrane 6 for multi-stage filtration of catalyst particles in hydrogenated liquid are rotatably connected. The pore sizes on the surfaces of the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6 decrease in sequence. On one side of the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6, a transmission mechanism for driving their rotation is provided. At the bottom of the filtration tank 2, a liquid storage mechanism for storing the hydrogenated liquid after filtration is fixedly connected. Inside the filtration tank 2, a vibration mechanism for driving the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6 to vibrate is provided. Inside the filtration tank 2, a cleaning brush 7 for cleaning the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6 is fixedly connected. On one side of the filtration tank 2, a catalyst discharging mechanism for discharging catalysts is provided.

[0033] By conveying the hydrogenated liquid into the feed pipe 3, the hydrogenated liquid is conveyed into the filtration tank 2 through the feed pipe 3. Through the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6 inside the filtration tank 2, multi-stage filtration of catalyst particles in the hydrogenated liquid is carried out. While filtering the hydrogenated liquid, the transmission mechanism drives the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6 to rotate slowly. While rotating, the cleaning brush 7 cleans the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6, so that the catalyst particles on the surfaces of the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6 fall into the catalyst discharging mechanism, and the catalyst particles are discharged through the catalyst discharging mechanism. The filtered hydrogenated liquid is stored through the liquid storage mechanism; the three-stage filtration membranes intercept particulate matters with different particle sizes step by step. The rotational motion driven by the transmission mechanism not only effectively prevents the clogging of the filter membrane pores and delays the rise of pressure difference, but also can enhance the solid-liquid separation efficiency through centrifugal action. At the same time, the dynamic filtration mode reduces the static deposition of the filter cake layer on the filter membrane surface, significantly improves the filtration flux and prolongs the service life of the filter membrane, and finally ensures the stability and treatment efficiency of the filtration system during the continuous production process.

[0034] In addition, in specific applications, the first filtration membrane 4, the second filtration membrane 5, and the third filtration membrane 6 are all hydrogenated liquid catalyst filtration membranes, only with different pore sizes. Their preparation technology is as follows: First, a pretreated ceramic membrane tube is prepared. The pretreated ceramic membrane tube is a ceramic membrane tube treated with an amino silane coupling agent. Then, under the condition of nitrogen protection, polyethyleneimine and toluene are mixed, succinic anhydride is added, and after heating and refluxing for 6 hours, a treating agent is obtained; then the pretreated ceramic membrane tube is added into the graphene oxide dispersion liquid, soaked and taken out, washed with deionized water, dried with nitrogen, added into the treating agent aqueous solution, soaked, taken out and washed with deionized water, and dried with nitrogen; finally, the above steps are repeated to obtain a hydrogenated liquid catalyst filtration membrane.

[0035] Further, as Figures 2-6 shown, the transmission mechanism includes a first motor 8 fixedly connected to one side of the filter tank 2. The output shaft of the first motor 8 is fixedly connected with a transmission wheel 9. A gear 10 for slowing down the rotation speed is meshed on the surface of the transmission wheel 9. A spline rod 12 is rotatably connected inside the filter tank 2. The gear 10 is fixedly connected to the surface of the spline rod 12. One end of the spline rod 12 is slidably connected with a mounting plate 11. The mounting plate 11 is slidably connected inside the filter tank 2. The first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 are fixedly installed on the surface of the mounting plate 11 and are used for disassembling the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6. Moreover, the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 are all slidably connected inside the filter tank 2.

[0036] The first motor 8 drives the transmission wheel 9 to rotate. The transmission wheel 9 drives the gear 10 to rotate slowly, so that the gear 10 drives the spline rod 12 to rotate. The spline rod 12 drives the mounting plate 11 to rotate inside the filter tank 2, so that the mounting plate 11 drives the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 to rotate slowly inside the filter tank 2. The rotational motion not only effectively prevents the pores of the filter membrane from being blocked and delays the rise of the pressure difference, but also can enhance the solid-liquid separation efficiency through the centrifugal action. At the same time, the dynamic filtration mode reduces the static deposition of the filter cake layer on the surface of the filter membrane, significantly improves the filtration flux and prolongs the service life of the filter membrane.

[0037] Further, as Figure 3 、 Figure 5 、 Figure 6 and Figure 7 shown, the vibration mechanism includes a vibrating rod 14 fixedly connected inside the filter tank 2. An annular corrugated plate 13 is fixedly connected to one side of the mounting plate 11. One end of the vibrating rod 14 contacts the surface of the annular corrugated plate 13. Springs 25 for driving the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 to vibrate are fixedly connected to one side of the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6, and one end of each spring 25 is fixedly connected inside the filter tank 2.

[0038] When the mounting plate 11 rotates, the mounting plate 11 drives the annular corrugated plate 13 to rotate synchronously, so that the annular corrugated plate 13 slides at one end of the vibrating rod 14. The first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 and the mounting plate 11 are all slidably connected inside the filter tank 2. When the annular corrugated plate 13 rotates, it drives the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 and the mounting plate 11 to slide inside the filter tank 2 through the vibrating rod 14. At the same time, the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 are reset by the springs 25. In this way, the vibration of the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 is completed. When the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 vibrate, the mounting plate 11 slides at one end of the spline rod 12, which will not affect its transmission effect.

[0039] Further, as Figure 1 , Figure 2 , Figure 3 and Figure 6 shown, the savings institution includes a liquid storage tank 15 fixedly connected to the discharge end of the filtration tank 2. One end of the liquid storage tank 15 is fixedly connected with a discharge pipe 16 for convenient discharging. An electronic switch valve 17 for controlling the discharge of the liquid storage tank 15 is fixedly installed on the inner wall of the discharge pipe 16. A third motor 18 is fixedly connected to the bottom of the liquid storage tank 15. The output shaft of the third motor 18 is fixedly connected with a stirring rod 19 for stirring the hydrogenated liquid that has been filtered inside the liquid storage tank 15. The stirring rod 19 is rotatably connected inside the liquid storage tank 15.

[0040] The filtered hydrogenated liquid is transported into the liquid storage tank 15 through the discharge end of the filtration tank 2. When in use, the electronic switch valve 17 is opened to discharge the hydrogenated liquid through the discharge pipe 16. When not in use, the electronic switch valve 17 can be closed. The third motor 18 drives the stirring rod 19 to stir the filtered hydrogenated liquid to prevent precipitation inside the hydrogenated liquid.

[0041] Further, as Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 7 shown, the catalyst discharge mechanism includes a cleaning frame 21 fixedly connected inside the filtration tank 2. The cleaning frame 21 is located inside the first filter membrane 4, the second filter membrane 5, and the third filter membrane 6. A spiral discharge rod 24 for driving the discharge of catalyst particles is rotatably connected inside the cleaning frame 21. A cleaning hole is formed on one side of the cleaning frame 21. One end of the spiral discharge rod 24 is fixedly connected with a synchronous pulley 22. A second motor 20 is fixedly installed on one side of the filtration tank 2. The output shaft of the second motor 20 is fixedly connected to one end of the synchronous pulley 22. A synchronous belt 23 for driving the synchronous rotation of the synchronous pulley 22 is engaged on the surface of the synchronous pulley 22. The cleaning brush 7 contacts the inner tops of the first filter membrane 4, the second filter membrane 5, and the third filter membrane 6 respectively, and the first filter membrane 4, the second filter membrane 5, and the third filter membrane 6 are located above the cleaning frame 21.

[0042] When the cleaning brush 7 cleans the first filter membrane 4, the second filter membrane 5, and the third filter membrane 6, the cleaned catalyst particles will fall into the cleaning frame 21. The second motor 20 drives the synchronous pulley 22 to rotate, so that the synchronous pulley 22 drives several other synchronous pulleys 22 to rotate simultaneously through the synchronous belt 23, and drives the spiral discharge rod 24 to rotate, discharging the catalyst particles of different sizes that have fallen into the cleaning frame 21 through the cleaning hole on one side of the cleaning frame 21. A connecting pipe can be arranged at the cleaning hole to recycle the catalyst particles of different sizes.

[0043] The working principle of the membrane filtration device for separating waste catalyst from hydrogenation liquid is as follows:

[0044] By conveying the hydrogenated liquid into the feed pipe 3, the hydrogenated liquid is conveyed into the filter tank 2 through the feed pipe 3, and the catalyst particles in the hydrogenated liquid are filtered in multiple stages through the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 inside the filter tank 2. While filtering the hydrogenated liquid, the motor 8 drives the transmission wheel 9 to rotate, and the transmission wheel 9 drives the gear 10 to rotate slowly, so that the gear 10 drives the spline rod 12 to rotate, and the spline rod 12 drives the mounting plate 11 to rotate inside the filter tank 2, so that the mounting plate 11 drives the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 to rotate slowly inside the filter tank 2; the three-stage filter membrane intercepts particles of different particle sizes step by step, and the rotational motion not only effectively prevents the clogging of the filter membrane pores and delays the increase in pressure difference, but also enhances the solid-liquid separation efficiency through centrifugal action. At the same time, the dynamic filtration mode reduces the static deposition of the filter cake layer on the surface of the filter membrane, significantly improves the filtration flux and extends the service life of the filter membrane, and ultimately ensures the stability and processing efficiency of the filtration system in the continuous production process.

[0045] While the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 are rotating, the cleaning brush 7 cleans the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6, and the cleaned catalyst particles will fall into the cleaning frame 21. The synchronous wheel 22 is driven to rotate by the motor 20, so that the synchronous wheel 22 drives the other synchronous wheels 22 to rotate at the same time through the synchronous belt 23, so that the spiral discharging rod 24 is driven to rotate, and the catalyst particles of different sizes dropped in the cleaning frame 21 are discharged through the cleaning hole on one side of the cleaning frame 21. A connecting pipe can be set at the cleaning hole to discharge catalyst particles of different sizes. The technology realizes the efficient recovery of catalyst particles and the continuous self-cleaning of the filtration system through the synergistic effect of the rotating filter membrane and the automatic cleaning and deslagging system. The cleaning brush 7 scrapes off the surface deposited particles synchronously with the rotation of the filter membrane to prevent pore blockage. The fallen particles are dynamically transported by the spiral discharge rod 24 to accurately separate and recover particles of different particle sizes. The synchronous wheel 22 transmission system ensures that the deslagging process is stable and continuous, which not only avoids the efficiency loss caused by shutdown for cleaning, but also improves the catalyst recovery rate, while reducing the maintenance frequency of the filter membrane, further enhancing the degree of automation and long-term operation capability of the filtration system.

[0046] When the mounting plate 11 rotates, the mounting plate 11 drives the annular corrugated plate 13 to rotate synchronously, causing the annular corrugated plate 13 to slide at one end of the vibrating rod 14. The first filter membrane 4, the second filter membrane 5, the third filter membrane 6 and the mounting plate 11 are all slidably connected inside the filter tank 2. When the annular corrugated plate 13 rotates, it drives the first filter membrane 4, the second filter membrane 5, the third filter membrane 6 and the mounting plate 11 to slide inside the filter tank 2 through the vibrating rod 14. At the same time, the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 are reset by the spring 25. This process is repeated to complete the vibration of the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6. In cooperation with the cleaning brush 7, the first filter membrane 4, the second filter membrane 5 and the third filter membrane 6 during vibration are scraped and cleaned; through the linkage design of the annular corrugated plate 13 and the vibrating rod 14, combined with the spring 25 reset mechanism, the dynamic vibration and cleaning synergy of the multi-stage filter membrane are realized. Rotating the mounting plate 11 drives the annular corrugated plate 13 to periodically squeeze the vibrating rod 14, causing the filter membrane to generate high-frequency vibration during sliding, effectively shaking off the deeply attached particles and loosening the filter cake layer. In cooperation with the cleaning brush 7, the surface impurities are synchronously scraped off. The dual effects of vibration and cleaning significantly improve the dredging efficiency of the filter membrane pores, prevent micropore blockage and reduce pressure difference fluctuations. At the same time, the solid-liquid separation effect is strengthened, the service life of the filter membrane is further extended, and it is ensured that the filtration system can still maintain a stable flux and continuous cleaning ability under high load.

[0047] Although specific embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these specific embodiments without departing from the principles and spirit of the invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A membrane filtration device for separating waste catalysts from hydrogenation liquid, comprising a base (1), characterized in that, One end of the base (1) is fixedly connected to a filter tank (2) for filtering waste catalysts in the hydrogenation liquid. One end of the filter tank (2) is fixedly connected to a feed pipe (3) for transporting the hydrogenation liquid. Inside the filter tank (2), a first filter membrane (4), a second filter membrane (5), and a third filter membrane (6) for multi-stage filtering of catalyst particles in the hydrogenation liquid are rotatably connected. The pore sizes on the surfaces of the first filter membrane (4), the second filter membrane (5), and the third filter membrane (6) decrease in sequence. A transmission mechanism for driving their rotation is provided on one side of the first filter membrane (4), the second filter membrane (5), and the third filter membrane (6). A liquid storage mechanism for storing the hydrogenation liquid after filtration is fixedly connected to the bottom of the filter tank (2). A vibration mechanism for vibrating the first filter membrane (4), the second filter membrane (5), and the third filter membrane (6) is provided inside the filter tank (2). A cleaning brush (7) for cleaning the first filter membrane (4), the second filter membrane (5), and the third filter membrane (6) is fixedly connected inside the filter tank (2). A catalyst discharging mechanism for discharging the catalyst is provided on one side of the filter tank (2).

2. The membrane filtration device for separating waste catalysts in a hydrogenation liquid according to claim 1, wherein: The transmission mechanism includes a first motor (8) fixedly connected to one side of the filter tank (2). The output shaft of the first motor (8) is fixedly connected to a transmission wheel (9). A gear (10) for slowing down the rotation speed is meshed on the surface of the transmission wheel (9). A spline rod (12) is rotatably connected inside the filter tank (2). The gear (10) is fixedly connected to the surface of the spline rod (12). One end of the spline rod (12) is slidably connected to a mounting plate (11), and the mounting plate (11) is slidably connected inside the filter tank (2).

3. The membrane filtration device for separating waste catalysts in the hydrogenation liquid according to claim 2, wherein: The first filter membrane (4), the second filter membrane (5), and the third filter membrane (6) are fixedly installed on the surface of the mounting plate (11) and are used for disassembling the first filter membrane (4), the second filter membrane (5), and the third filter membrane (6). Moreover, the first filter membrane (4), the second filter membrane (5), and the third filter membrane (6) are all slidably connected inside the filter tank (2).

4. The membrane filtration device for separating waste catalysts in hydrogenation liquid according to claim 3, characterized in that: The vibration mechanism includes a vibration rod (14) fixedly connected inside the filter tank (2). An annular corrugated plate (13) is fixedly connected to one side of the mounting plate (11), and one end of the vibration rod (14) is in contact with the surface of the annular corrugated plate (13).

5. The membrane filtration device for separating waste catalysts in hydrogenation liquid according to claim 4, characterized in that: A spring (25) for vibrating the first filter membrane (4), the second filter membrane (5), and the third filter membrane (6) is fixedly connected to one side of the first filter membrane (4), the second filter membrane (5), and the third filter membrane (6), and one end of the spring (25) is fixedly connected inside the filter tank (2).

6. The membrane filtration device for separating waste catalysts in hydrogenation liquid according to claim 1, characterized in that: The liquid storage mechanism includes a liquid storage tank (15) fixedly connected to the discharging end of the filter tank (2). One end of the liquid storage tank (15) is fixedly connected to a discharging pipe (16) for facilitating discharging. An electronic switch valve (17) for controlling the discharging of the liquid storage tank (15) is fixedly installed on the inner wall of the discharging pipe (16).

7. The membrane filtration device for separating waste catalysts in hydrogenation liquid according to claim 6, wherein: A motor three (18) is fixedly connected to the bottom of the liquid storage tank (15). The output shaft of the motor three (18) is fixedly connected to a stirring rod (19) for stirring the hydrogenation liquid that has been filtered inside the liquid storage tank (15). The stirring rod (19) is rotatably connected inside the liquid storage tank (15).

8. The membrane filtration device for separating waste catalysts in hydrogenation liquid according to claim 1, wherein: The catalyst discharging mechanism includes a cleaning frame (21) fixedly connected inside the filtration tank (2). The cleaning frame (21) is located inside the first filtration membrane (4), the second filtration membrane (5), and the third filtration membrane (6). A spiral discharging rod (24) for driving the discharge of catalyst particles is rotatably connected inside the cleaning frame (21). A cleaning hole is formed on one side of the cleaning frame (21).

9. The membrane filtration device for separating waste catalyst from hydrogenation liquid according to claim 8, wherein: One end of the spiral discharging rod (24) is fixedly connected to a synchronous pulley (22). A motor two (20) is fixedly installed on one side of the filtration tank (2). The output shaft of the motor two (20) is fixedly connected to one end of the synchronous pulley (22). A synchronous belt (23) that drives the synchronous rotation of the synchronous pulley (22) is engaged with the surface of the synchronous pulley (22).

10. The membrane filtration device for separating waste catalysts in the hydrogenation liquid according to claim 8, wherein: The cleaning brushes (7) respectively contact the inner tops of the first filtration membrane (4), the second filtration membrane (5), and the third filtration membrane (6), and the first filtration membrane (4), the second filtration membrane (5), and the third filtration membrane (6) are located above the cleaning frame (21).

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