A device for effectively protecting catalysts and a purification method based on the device.

Abstract

This application relates to an effective device for protecting the catalyst and a purification method based on the device, relating to the technical field of anthraquinone process for hydrogen peroxide production. The device includes a primary unit and a secondary unit. The primary unit includes a primary shell and a primary filter element. The filter element has an inner layer and an outer layer; the inner layer is a composite layer composed of one or two of polyester and glass fiber layers, and the outer layer is a cation exchange resin layer. The secondary unit includes a secondary shell and a secondary filter element; the filter element has a fluorine-containing material layer. The primary and secondary units, connected in series, purify the regenerated liquid, removing dust particles and metal ions through a systematic purification method. This mitigates the impact of dust particles and metal ions introduced into the regenerated liquid by the clay bed on the catalyst and the finished product, and addresses a series of problems during hydrogen peroxide production, such as high pressure drop in the hydrogenation tower bed, rapid activity decline, increased side reactions, and unstable hydrogen peroxide production.

Description

Technical Field

[0001] This application relates to the technical field of anthraquinone method for preparing hydrogen peroxide, and in particular to an apparatus for effectively protecting the catalyst and a purification method based on the apparatus. Background Technology

[0002] The anthraquinone process for producing hydrogen peroxide is one of the most mature methods in the world. It utilizes the property that quinones can be hydrogenated and reduced back to their original form. Alkylquinone derivatives are used as carriers, hydrogenated under the catalysis of a palladium catalyst, and then oxidized to synthesize hydrogen peroxide. The process involves anthraquinone hydrogenation, oxidation, extraction, and regeneration. After regeneration, the anthraquinone is returned to the hydrogenation unit, and the process is repeated. Therefore, the production of hydrogen peroxide is a cyclical process.

[0003] In palladium-catalyzed hydrogenation reactions, the main factors affecting catalytic deactivation are: 1) poisoning deactivation; 2) blockage deactivation; 3) sintering deactivation (thermodynamic sintering / chemical sintering); and 4) thermal deactivation. The regeneration process of the regenerated liquid in an anthraquinone hydrogen peroxide plant is typically achieved through a clay bed. The clay particles packed in the clay bed introduce a large amount of fine dust and trace amounts of metal ions (such as Cr, Fe, Ni, Co, Cu, etc.) into the system. The fine dust deposits on the catalyst surface, even encapsulating it, reducing the catalyst's active surface area or isolating active components, leading to decreased or deactivated palladium catalyst activity and affecting its lifespan. The trace amounts of metal ions cause slow chemical sintering of the palladium catalyst's active components, resulting in a decrease in the content of active microcrystalline palladium and affecting catalyst activity.

[0004] In the traditional anthraquinone process for hydrogen peroxide production, the regenerated liquid from the clay bed is filtered through a bag filter before entering the hydrogenation unit (which is filled with palladium catalyst). The regenerated liquid entering the hydrogenation unit contains a large amount of dust particles and trace amounts of metal ions. The presence of dust particles and metal ions reduces the activity of the palladium catalyst, affecting its lifespan and selectivity; it also leads to a decline in the quality of the finished product. Summary of the Invention

[0005] In order to mitigate the impact of dust particles and trace metal ions in the regenerated solution on production equipment and finished products, this application provides an effective device for protecting the catalyst and a purification method based on the device.

[0006] This application provides an effective protection method for catalyst equipment and a purification method based on the equipment, which adopts the following technical solution:

[0007] Firstly, this application provides a device for effectively protecting a catalyst, employing the following technical solution:

[0008] A device for effectively protecting a catalyst includes a primary device and a secondary device connected in series with the primary device;

[0009] The primary device includes a primary shell and a primary filter element. The filter element has an inner layer and an outer layer. The inner layer is a composite layer composed of one or two of polyester and glass fiber layers, and the outer layer is a cation exchange resin layer.

[0010] The secondary device includes a secondary housing connected to the primary housing and a secondary filter element, wherein the filter layer of the secondary filter element is a fluorine-containing material layer.

[0011] By employing the above technical solution, a primary and a secondary device containing different filter media are connected in series to purify the regenerated liquid to be added to the hydrogenation unit. The primary filter element completely purifies particulate matter with a diameter of 10 μm or larger, achieving a purification efficiency of 99.91% for particles with a diameter of 1 μm. The secondary filter element completely purifies particulate matter with a diameter of 2 μm or larger, achieving a purification efficiency of 99.99% for particles with a diameter of 1 μm. This systematic method of sequentially purifying the regenerated liquid using primary and secondary devices effectively removes dust particles and metal cations from the liquid material, mitigating a series of problems in hydrogen peroxide production, such as high pressure drop in the hydrogenation tower bed, rapid decrease in activity, increased side reactions, and unstable hydrogen peroxide production caused by particulate matter in the regenerated liquid.

[0012] Optionally, the primary filter element has at least two inner layers, and the secondary filter element has one or two layers.

[0013] By adopting the above technical solution, the primary filter element is configured with multiple filtration layers, and the secondary filter element is configured with one or more filtration layers. The multiple layers purify the regenerated liquid step by step, thereby improving the purification effect of the primary and secondary filter elements on the regenerated liquid.

[0014] Optionally, the filtration precision of each layer in the inner layer of the primary filter element is different; when the secondary filter element is set to have two layers, the filtration precision of the two layers is different.

[0015] By adopting the above technical solution and configuring filter media with different filtration precision, the filtration precision and filtration characteristics of the primary and secondary filter elements can be adjusted, making it easier to configure different filter elements according to different filtration needs and improving the versatility of the primary and secondary filter elements.

[0016] Optionally, the outer wall of the primary housing is provided with a vent pipe, lifting lugs, a feed pipe, a discharge pipe, a pressure gauge pipe for installing a pressure gauge, a drain pipe, and an electrostatic grounding plate.

[0017] By adopting the above technical solution, the regenerated liquid enters the primary unit along the feed pipe, is purified by the primary filter element, and flows out along the discharge pipe. The pressure of the primary unit is easily monitored by the pressure gauge pipe and pressure gauge to ensure the stable purification effect of the primary unit. The drain pipe is used to empty the regenerated liquid in the primary unit. The electrostatic grounding plate eliminates the static electricity generated during the purification process, the venting pipe realizes the depressurization of the primary unit and reduces the pressure inside the primary unit, and the lifting lugs facilitate the relocation of the primary unit.

[0018] Optionally, a partition is fixedly installed on the inner wall of the primary housing, the feed pipe and the discharge pipe are respectively placed on both sides of the partition, the partition has mounting holes, and a mounting assembly for fixing the primary filter element on the partition is fixedly installed on the partition, with the end of the primary filter element placed at the mounting hole.

[0019] By adopting the above technical solution, the regenerated liquid flows into one side of the baffle along the feed pipe and passes through the first-stage filter element under its own continuous pressure to enter the other side of the baffle. The baffle separates the unpurified and purified regenerated liquid in the first-stage shell.

[0020] Optionally, the mounting assembly includes a pull rod fixedly mounted on the partition, a support plate fixedly mounted on the end of the pull rod away from the partition, and a guide plate placed between the partition and the pull plate. The guide plate is connected to the pull rod and has a guide hole. The primary filter element passes through the mounting hole and the guide hole and abuts against the support plate. The end of the primary filter element is sealed to the wall of the mounting hole.

[0021] By adopting the above technical solution, when installing the primary filter element on the partition, the pull rod is first fixedly installed on the partition, then the guide plate is installed in the middle of the pull rod, and the support plate is installed at the end of the pull rod. Then, the primary filter element is passed through the mounting hole and the guide hole so that its end is pressed against the support plate. The support plate provides fixed support for the primary filter element to realize its installation on the mounting assembly, and the guide plate limits the primary filter element, improving the stability of the primary filter element fixedly installed on the mounting assembly.

[0022] Optionally, a sealing ring is provided on the wall of the mounting hole, and the outer peripheral wall of the primary filter element abuts against the inner ring of the sealing ring.

[0023] By adopting the above technical solution, the sealing ring is placed between the hole wall of the mounting hole and the primary filter element, thereby achieving a sealed connection between the primary filter element and the partition plate and reducing the risk of unpurified regenerated liquid flowing to the purified regenerated liquid side through the gap between the primary filter element and the mounting hole of the partition plate.

[0024] Optionally, a filter cavity is formed in the primary filter element along the axial direction. The primary device further includes a pressurization component. The pressurization component includes a liquid guide rod rotatably installed in the filter cavity, a limiting bracket fixedly installed on the partition plate for axially limiting the liquid guide rod, and a plurality of fan blades circumferentially fixed on the liquid guide rod. The liquid guide rod is rotatably engaged with the limiting bracket. The outer wall of the liquid guide rod is spirally provided with a liquid guide groove. The cavity of the feed pipe is arranged facing the fan surface of the fan blades.

[0025] By adopting the above technical solution, the purification speed is slow due to the high purification accuracy and small purification area of ​​the first-stage filter element. A pressurization device is installed, where the regenerated liquid entering the first-stage housing along the feed pipe acts on the fan blades. The fan blades drive the guide rod to rotate, and the guide groove on the guide rod pumps the regenerated liquid into the filter chamber, increasing the flow rate of the regenerated liquid in the filter chamber, thereby pressurizing the regenerated liquid in the filter chamber and improving the purification efficiency of the first-stage filter element.

[0026] Optionally, a connecting pipe is provided between the discharge pipe and the secondary device, and a hydraulic motor is provided between the connecting pipes. The top end of the liquid guide rod passes through the primary housing and is connected to the hydraulic motor for transmission.

[0027] By adopting the above technical solution, a hydraulic motor is installed between the connecting pipes. The regenerated liquid purified by the primary device flows through the connecting pipes, driving the hydraulic motor to rotate. The hydraulic motor drives the guide rod to rotate, thereby increasing the pressure of the pressurization component.

[0028] Secondly, this application also discloses a purification method for a device that effectively protects the catalyst, employing the following technical solution:

[0029] A purification method for a device that effectively protects the catalyst includes the following steps:

[0030] S1. Primary Purification: The primary device performs primary purification and cation exchange on the liquid material to be purified. The liquid material to be purified is fed into the primary housing through the primary feed pipe. The primary filter element inside the primary housing purifies the liquid material to be purified. The purified liquid material flows out from the primary discharge pipe.

[0031] S2, Secondary Purification: The secondary device is used to purify the liquid material that has been purified in the primary stage. The liquid material that has been purified in the primary stage is fed into the secondary housing through the secondary feed pipe. The secondary filter element inside the secondary housing purifies the liquid material that has been purified in the primary stage. The purified liquid material flows out from the secondary discharge pipe.

[0032] In summary, this application includes the following beneficial technical effects:

[0033] 1. Connecting primary and secondary units with different filter media in series, the regenerated liquid to be added to the hydrogenation unit is purified. The systematic purification process removes dust particles and metal ions and other impurities from the regenerated liquid, reducing the impact on the palladium catalyst and the finished product. At the same time, it improves a series of problems caused by impurities, such as high pressure drop in the hydrogenation tower bed, rapid decrease in activity, increased side reactions, and unstable hydrogen peroxide production.

[0034] 2. A pressurization device is installed to increase the flow rate of the regenerated liquid in the filter chamber, thereby pressurizing the regenerated liquid in the filter chamber and improving the purification efficiency of the first-stage filter element;

[0035] 3. A systematic purification method that uses primary and secondary devices to purify liquid materials in sequence effectively removes particulate matter from the liquid materials, and improves a series of problems caused by particulate matter in the regenerated liquid during the hydrogen peroxide production process, such as high pressure drop in the hydrogenation tower bed, rapid decrease in activity, increased side reactions, and unstable hydrogen peroxide production. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0037] Figure 2 This is a schematic diagram of the structure of the primary filter element in Embodiment 1 of this application.

[0038] Figure 3 This is a schematic diagram of the overall structure of Embodiment 4 of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Primary unit; 11. Primary housing; 1101. Lower housing; 1102. Upper housing; 1103. Upper housing cavity; 1104. Lower housing cavity; 1105. Feed pipe; 1106. Discharge pipe; 1107. Pressure gauge pipe; 1108. Drain pipe; 1109. Static grounding plate; 1110. Vent pipe; 1111. Lifting lug; 12. Primary filter element; 121. Filter element outer frame; 122. Filter element inner support. 1. Support; 2. Filter element end cap; 3. Filter element support grid; 4. Secondary device; 5. Secondary housing; 6. Secondary filter element; 7. Partition plate; 8. Mounting hole; 9. Mounting assembly; 10. Tie rod; 11. Support plate; 12. Guide plate; 13. Guide hole; 14. Sealing ring; 15. Filter chamber; 16. Pressurization assembly; 17. Liquid guide rod; 18. Limiting bracket; 19. Fan blade; 10. Liquid guide groove; 10. Connecting pipe; 11. Hydraulic motor. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0041] This application discloses a device for effectively protecting catalysts and a purification method based on the device.

[0042] Example 1:

[0043] Reference Figure 1 and Figure 2 An effective device for protecting a catalyst includes a primary device 1, a secondary device 2, and a connecting pipe 8 connecting the primary device 1 and the secondary device 2.

[0044] The primary unit 1 and the secondary unit 2 purify the regenerated liquid, removing dust particles and trace metal ions. This improves the problem of excessive dust particles and trace metal ions in the regenerated liquid entering the hydrogenation unit 10, reduces the impact of dust particles and trace metal ions on the hydrogenation tower catalyst and the finished product, and further mitigates a series of problems caused by dust particles in the regenerated liquid during hydrogen peroxide production, such as high pressure drop in the hydrogenation tower bed, rapid decrease in activity, increased side reactions, and unstable hydrogen peroxide production.

[0045] Reference Figure 1 and Figure 2 The primary device 1 includes a primary housing 11, a mounting assembly 5 fixedly installed inside the primary housing 11, and a primary filter element 12 fixedly installed on the mounting assembly 5.

[0046] The primary outer shell 11 is capsule-shaped, comprising a lower shell 1101 with one open end and an upper shell 1102 with one open end. The open ends of the upper shell 1102 and the lower shell 1101 are positioned opposite each other and are rotatably connected by a hinge. The upper shell 1102 is rotatably fastened to the open end of the lower shell 1102. A lower shell cavity 1104 is formed inside the lower shell 1101, and an upper shell cavity 1103 is formed inside the upper shell 1102.

[0047] An inlet pipe 1105 and an outlet pipe 1106 are welded and installed on the outer wall of the lower housing 1101. The lumen of the inlet pipe 1105 and the lumen of the outlet pipe 1106 are both connected to the lower housing cavity 1104, and the end of the outlet pipe 1106 away from the lower housing 1101 is connected to one end of the connecting pipe 8. The regenerated liquid enters the primary housing 11 along the inlet pipe 1105, is purified by the primary filter element 12, flows out along the outlet pipe 1106, and flows to the secondary device 2 through the connecting pipe 8.

[0048] A pressure gauge tube 1107 is welded and installed on the lower housing 1101, and the lumen of the pressure gauge tube 1107 is connected to the lower housing cavity 1104. The pressure gauge tube 1107 is used to install a pressure gauge, which facilitates real-time monitoring of the pressure inside the primary housing 11, ensuring that the pressure inside the primary housing 11 is stable and moderate, reducing the risk of leakage or explosion of the primary housing 11, and improving the service life of the primary device 1. A drain pipe 1108 is welded and installed at the bottom of the lower housing 1101, and the lumen of the drain pipe 1108 is connected to the lower housing cavity 1104, which facilitates the drainage of the regenerated liquid inside the primary housing 11. An electrostatic grounding plate 1109 is bolted to the bottom of the lower housing 1101. The electrostatic grounding plate 1109 is placed on the ground to connect with the ground, conduct the static electricity generated during the purification process to the ground, eliminate the static electricity generated during the purification process, and reduce the impact of static electricity on the purification equipment.

[0049] A vent pipe 1110 is welded to the top of the upper housing 1102. The cavity of the vent pipe 1110 is connected to the upper housing cavity 1103. Normally, a switch control valve is installed at the vent pipe 1110 to control its opening and closing. The vent pipe 1110 facilitates the discharge of regenerated liquid or gas from the primary housing 11, or depressurizes the primary housing 11, reducing the pressure within the primary device 1 and maintaining pressure stability. A lifting lug 1111 is also welded to the upper housing 1102. The lifting lug 1111 facilitates the hooking of a lifting hook or the threading of a lifting rope, facilitating the movement of the primary device 1.

[0050] Reference Figure 1 and Figure 2 A partition 3 is provided inside the lower housing 1101. The partition 3 is disc-shaped, and its edge is seamlessly welded to the inner wall of the lower housing 1101 to separate the lower housing cavity 1104. The inlet pipe 1105 and the outlet pipe 1106 are located on both sides of the partition 3 to connect with the lower housing 1101. A mounting hole 4 is provided through the partition 3, and the top of the primary filter element 12 is installed in the mounting hole 4.

[0051] An installation assembly 5 is fixedly installed on the partition 3, positioned on the side of the partition 3 closest to the discharge pipe 1106. The installation assembly 5 includes a pull rod 51 bolted to the partition 3, a support plate 52 mounted on the pull rod 51, and a guide plate 53. The support plate 52, guide plate 53, and partition 3 are arranged parallel to each other. There are four pull rods 51, symmetrically distributed about the central axis of the partition 3. The guide plate 53 is bolted to the middle of the length of the four pull rods 51, and the support plate 52 is bolted to the ends of the four pull rods 51 furthest from the partition 3. The guide plate 53 has a guide hole 54, the shape of which is adapted to the cross-sectional shape of the primary filter element 12 and coaxially arranged with the installation hole 4.

[0052] When mounting component 5 is assembled on partition 3, first fix the tie rod 51 on partition 3, then install the guide plate 53 on the middle position of tie rod 51 with bolts, and finally install the support plate 52 on the end position of tie rod 51. This completes the assembly of mounting component 5 on partition 3.

[0053] When installing the primary filter element 12, simply pass the primary filter element 12 through the mounting hole 4 and the guide hole 54 so that its end is pressed against the support plate 52. At this time, the other end of the primary filter element 12 is just placed at the mounting hole 4. The guide hole 54 on the guide plate 53 limits the primary filter element 12, and the support plate 52 supports the primary filter element 12 in the axial direction, thereby improving the stability of the primary filter element 12 in the mounting assembly 5. The mounting assembly 5 realizes the positioning and installation of the filter element in the primary housing 11.

[0054] A sealing ring 55 is embedded in the wall of the mounting hole 4. In this embodiment, the sealing ring 55 is an O-ring, and the material of the O-ring is fluororubber or fluoropolymer-coated material. After the primary filter element 12 is installed in the primary housing 11 through the mounting assembly 5, the end of the primary filter element 12 passes through the mounting hole 4 and is installed. The outer wall of the end of the primary filter element 12 abuts against the inner wall of the sealing ring 55. The sealing ring 55 fills and seals the gap between the mounting hole 4 and the primary filter element 12, thereby achieving a sealed connection between the primary filter element 12 and the partition plate 3.

[0055] The regenerated liquid enters the primary housing 11 through the feed pipe 1105 and is placed on one side of the partition 3. After being purified by the primary filter element 12, it enters the other side of the partition 3. The partition 3 separates the unpurified regenerated liquid from the purified regenerated liquid. The sealing ring 55 reduces the risk of unpurified regenerated liquid flowing to the purified regenerated liquid side through the gap between the primary filter element 12 and the mounting hole 4 of the partition 3.

[0056] The primary filter element 12 is cylindrical and includes an outer frame 121, an inner support 122 integrally formed inside the outer frame 121, an end cap 123 heat-fused to one end of the outer frame 121, and a support mesh 124 inserted between the outer frame 121 and the inner support 122. The outer frame 121, inner support 122, and end cap 123 are all made of polyester material. The end cap 123 is positioned on the side of the primary filter element 12 closest to the support plate 52. The primary filter element 12 measures 150mm x 1024mm.

[0057] Multiple filter element support grids 124 are arranged along the axial direction of the primary filter element 12. In this embodiment, the number of filter element support grids 124 is set to 3, and the 3 filter element support grids 124 are coaxially arranged with the filter element inner support 122 and are arranged to extend along the axial direction of the primary filter element 12 in sequence, with adjacent filter element support grids 124 abutting each other.

[0058] The filter element support mesh 124 is the filtration layer of the primary filter element 12, and it consists of an inner layer and an outer layer. Since the purification precision of the primary filter element 12 can be selected within the range of 1-5μm, there are many types of composite filter element support mesh 124, which can be adjusted according to different application conditions.

[0059] The inner layer of the filter element support grid 124 is a composite layer composed of one or two of polyester and glass fiber layers, and the outer layer is a cation exchange resin layer. Both the inner and outer layers are horizontally stacked to form multiple layers, with the outer cation exchange resin layer covering the outside of the inner layer.

[0060] In this embodiment, the inner layer of the filter element support grid 124 is a polyester layer (polybutylene terephthalate cloth with a purification accuracy of 5μm) and a glass fiber layer (glass fiber cloth with a purification accuracy of 2μm) arranged sequentially from the inside to the outside. The purification accuracy of the two combined is 1μm, and the filtration efficiency for materials with a particle size of 1μm is 99.91%.

[0061] The outer layer of the filter element support grid 124 is a double-layer cation exchange resin (cation exchange resin 311) arranged sequentially from the inside out. Similarly, the thickness of the outer layer filter material of the filter element support grid 124 can be selected within the range of 1-20 mm. In this embodiment, the single-layer thickness of the cation exchange resin is 4 mm. The inner and outer layers purify and exchange cations in the regenerated liquid, improving the purification effect. The filter material is vertically folded, resulting in a large purification area and high throughput, increasing the throughput of the first-stage filter element 12 and reducing equipment investment.

[0062] The secondary device 2 includes a secondary housing 21 and a secondary filter element 22 fixedly installed on the secondary housing 21. The shape and structure of the secondary housing 21 are exactly the same as those of the primary housing 11. The only difference between the shape and structure of the secondary filter element 22 and the primary filter element 12 is that the secondary filter element 22 does not have an outer ion exchange resin filter material. The end of the connecting pipe 8 away from the primary device 1 is connected to the feed pipe 1105 of the secondary housing 21.

[0063] The difference between the secondary device 2 and the primary device 1 lies in the filter media of the secondary filter element 22. The filter media of the secondary filter element 22 is a fluorinated material, such as polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), ECTFE, or PFA, and the filter media is composed of multiple layers. In this embodiment, the filter media of the secondary filter element 22 is two layers of vertically stacked polytetrafluoroethylene (PTFE cloth, both with a filtration accuracy of 0.1 μm), and the purification efficiency for materials with a particle size of 0.1 μm or larger is 99.99%.

[0064] The implementation principle of Example 1 is as follows: The liquid material flows into the first-stage housing 11, is purified by the first-stage filter element 12 with polyester and glass fiber as filter media, and is then transported to the second-stage housing 21. It is then purified by the second-stage filter element 22 with fluorine-containing material as filter media. The first-stage filter element completely filters material particles with a particle size of 10μm or larger, and achieves a purification efficiency of 99.91% for material particles with a particle size of 1μm. The second-stage filter element completely filters material particles with a particle size of 2μm or larger, and achieves a purification efficiency of 99.99% for material particles with a particle size of 1μm. Thus, after purification, the liquid material with low dust particle and trace metal ion content is output.

[0065] By connecting a primary unit 1 and a secondary unit 2 containing different filter media in series, the primary unit 1 and the secondary unit 2 purify the regenerated liquid. Through a systematic purification method, dust particles and trace metal ions in the regenerated liquid are removed, which improves a series of problems in the hydrogen peroxide production process, such as high pressure drop in the hydrogenation tower bed, rapid decrease in activity, increased side reactions, and unstable hydrogen peroxide production caused by dust particles and trace metal ions in the regenerated liquid.

[0066] Example 2:

[0067] The difference between this embodiment and Embodiment 1 lies in the structure of the filter element support grid 124. The inner layer of the filter element support grid 124 consists of a polyester layer (polybutylene terephthalate cloth, purification accuracy 20μm), a glass fiber layer (glass fiber cloth, purification accuracy 10μm), and a polyester layer (polybutylene terephthalate cloth, purification accuracy 2μm) arranged sequentially along the axis of the primary filter element 12. The resulting composite material has a purification accuracy of 1μm and a filtration efficiency of 99.98% for materials with a particle size of 1μm.

[0068] Example 3:

[0069] The difference between this embodiment and Embodiment 1 is that the structure of the filter element support grid 124 is different.

[0070] The inner layer of the filter element support grid 124 is composed of a polyester layer (polybutylene terephthalate cloth, purification accuracy 20μm) and a polyester layer (polybutylene terephthalate cloth, purification accuracy 10μm) arranged sequentially along the axis of the primary filter element 12. After the composite, the filtration accuracy is 5μm, and the filtration efficiency for 5μm particle size is 99.91%.

[0071] Example 4:

[0072] Reference Figure 3 The difference between this embodiment and Embodiment 1 is that a pressurization component 7 is also provided in the primary device 1.

[0073] The cylindrical filter element has a filter cavity 6 inside, and the presence of the filter element end cap 123 makes the filter cavity 6 a blind hole.

[0074] The pressurization assembly 7 includes a limiting bracket 72 fixedly mounted on the side of the partition 3 away from the mounting assembly 5 by bolts, and a liquid guide rod 71 rotatably mounted on the limiting bracket 72. Part of the liquid guide rod 71 is rotatably mounted inside the filter chamber 6, and the end of the liquid guide rod 71 extends out of the upper housing 1102. The portion of the liquid guide rod 71 placed inside the primary housing 11 has a liquid guide groove 74 on its outer peripheral wall, which spirals upwards along the axis of the liquid guide rod 71. Multiple fan blades 73 are welded to the outer peripheral wall of the liquid guide rod 71. In this embodiment, the number of fan blades 73 is set to three, and they are symmetrically arranged about the axis of the liquid guide rod 71. The fan surface of each fan blade 73 faces the cavity of the feed pipe 1105.

[0075] The limiting bracket 72 limits the liquid guide rod 71 in the axial direction to prevent the liquid guide rod 71 from moving during rotation. The regenerated liquid enters the first-stage housing 11 along the feed pipe 1105. The regenerated liquid acts on the fan blade 73, which pushes the liquid guide rod 71 to rotate. The liquid guide groove 74 on the liquid guide rod 71 pumps the regenerated liquid into the filter chamber 6, increasing the flow rate of the regenerated liquid in the filter chamber 6, thereby pressurizing the regenerated liquid in the filter chamber 6 and improving the purification efficiency of the first-stage filter element 12.

[0076] Two hydraulic motors 9 are connected between the connecting pipes 8. The inlet and outlet of each hydraulic motor 9 are connected to the connecting pipes 8. The two hydraulic motors 9 are respectively bolted to the top of the primary housing 11 and the top of the secondary housing 21. The two hydraulic motors 9 can be connected in series or in parallel; in this embodiment, the two hydraulic motors 9 are connected in series. The output shaft of each hydraulic motor 9 is fixedly connected to the end of the guide rod 71 extending out of the upper housing 1102 via a coupling.

[0077] The regenerated liquid flowing through the connecting pipe 8 drives the hydraulic motor 9 to rotate, which in turn drives the guide rod 71 to rotate, thereby increasing the pressure of the pressurization component 7. When the flow rate of the regenerated liquid in the connecting pipe 8 increases, the hydraulic motor 9 rotates faster, thus increasing the pressure of the pressurization device, improving the purification speed of the first-stage filter element 12, and further increasing the flow rate of the regenerated liquid, achieving positive feedback.

[0078] The implementation principle of Example 2 is as follows: By setting up the pressurization component 7, the regenerated liquid enters the primary housing 11 along the feed pipe 1105. The regenerated liquid acts on the fan blades 73, which push the guide rod 71 to rotate. The guide groove 74 on the guide rod 71 pumps the regenerated liquid into the filter chamber 6, increasing the flow rate of the regenerated liquid in the filter chamber 6, thereby pressurizing the regenerated liquid in the filter chamber 6 and improving the purification efficiency of the primary filter element 12. The regenerated liquid purified by the primary device 1 flows to the connecting pipe 8 and drives the hydraulic motor 9 to rotate. The hydraulic motor 9 drives the guide rod 71 to rotate, realizing dual driving of the guide rod 71 and achieving pressurization of the regenerated liquid in the filter chamber 6 by the pressurization component 7.

[0079] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for effectively protecting a catalyst, characterized in that: It includes a primary device (1) and a secondary device (2) connected in series with the primary device (1). The primary device (1) includes a primary housing (11) and a primary filter element (12). The filter layer of the primary filter element (12) includes an inner layer and an outer layer. The inner layer is a composite layer composed of one or two of polyester layer and glass fiber layer, and the outer layer is a cation exchange resin layer. The secondary device (2) includes a secondary housing (21) connected to the primary housing (11) and a secondary filter element (22), wherein the filter layer of the secondary filter element (22) is a fluorine-containing material layer; The outer wall of the primary housing (11) is provided with a vent pipe (1110), a lifting lug (1111), a feed pipe (1105), a discharge pipe (1106), a pressure gauge pipe (1107) for installing a pressure gauge, a drain pipe (1108), and an electrostatic grounding plate (1109). A partition (3) is fixed on the inner wall of the first-stage housing (11). The feed pipe (1105) and the discharge pipe (1106) are respectively placed on both sides of the partition (3). The partition (3) is provided with mounting holes (4). A mounting assembly (5) for fixing the first-stage filter element (12) on the partition (3) is fixedly installed on the partition (3). The end of the first-stage filter element (12) is placed at the mounting hole (4). The primary filter element (12) has a filter cavity (6) formed along the axial direction. The primary device (1) also includes a pressurizing component (7). The pressurizing component (7) includes a liquid guide rod (71) rotatably installed in the filter cavity (6), a limiting bracket (72) fixedly installed on the partition plate (3) for axially limiting the liquid guide rod (71), and a plurality of fan blades (73) circumferentially fixed on the liquid guide rod (71). The liquid guide rod (71) is rotatably engaged with the limiting bracket (72). The outer wall of the liquid guide rod (71) is spirally provided with a liquid guide groove (74). The cavity of the feed pipe (1105) is arranged facing the fan surface of the fan blades (73). A connecting pipe (8) is connected between the discharge pipe (1106) and the secondary device (2). A hydraulic motor (9) is installed between the connecting pipes (8). The top end of the guide rod (71) passes through the primary housing (11) and is connected to the hydraulic motor (9) for transmission.

2. The device for effectively protecting a catalyst according to claim 1, characterized in that: The primary filter element (12) has a filter layer comprising at least two inner layers, and the secondary filter element (22) has a filter layer comprising one or two layers.

3. The device for effectively protecting a catalyst according to claim 2, characterized in that: The filtration precision of each layer in the inner layer of the primary filter element (12) is different; when the secondary filter element (22) is set to two layers, the filtration precision of each layer is different.

4. The device for effectively protecting a catalyst according to claim 1, characterized in that: The mounting assembly (5) includes a pull rod (51) fixedly mounted on the partition (3), a support plate (52) fixedly mounted on the end of the pull rod (51) away from the partition (3), and a guide plate (53) placed between the partition (3) and the pull rod (51). The guide plate (53) is connected to the pull rod (51), and a guide hole (54) is provided on the guide plate (53). The primary filter element (12) passes through the mounting hole (4) and the guide hole (54) and abuts against the support plate (52). The end of the primary filter element (12) is sealed to the wall of the mounting hole (4).

5. The device for effectively protecting a catalyst according to claim 4, characterized in that: A sealing ring (55) is provided on the wall of the mounting hole (4), and the outer peripheral wall of the primary filter element (12) abuts against the inner ring of the sealing ring (55).

6. A purification method for a device based on any one of claims 1-5 that effectively protects the catalyst, characterized in that, Includes the following steps: S1, Primary purification: The primary device (1) is used to perform primary purification and cation exchange on the liquid material to be purified. The liquid material to be purified is fed into the primary housing (11) through the primary feed pipe. The primary filter element (12) inside the primary housing (11) purifies the liquid material to be purified. The purified liquid material flows out from the primary discharge pipe. S2, Secondary Purification: The liquid material that has been purified in the first stage is purified in the second stage using the secondary device (2). The liquid material that has been purified in the first stage is fed into the secondary housing (21) through the secondary feed pipe. The secondary filter element (22) inside the secondary housing (21) purifies the liquid material that has been purified in the first stage. The purified liquid material flows out from the secondary discharge pipe.

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