Magnetic catalyst recycling and drying system

Abstract

The utility model discloses a magnetic catalyst recycling and drying system, and relates to the technical field of magnetic catalyst recycling equipment, the magnetic catalyst recycling and drying system comprises a cleaning kettle, a magnetic suction device and a separation device; the magnetic suction device is used for separating a magnetic catalyst from a cleaning solution; the magnetic suction device is connected with the cleaning kettle through a first pipeline; the magnetic suction device is further connected with a second pipeline, and the second pipeline is used for inputting a drying medium into the magnetic suction device; and the separation device is connected with the magnetic suction device through a third pipeline and is used for separating the drying medium and the magnetic catalyst. According to the magnetic catalyst recycling and drying system, the used magnetic catalyst can be continuously and integrally subjected to the steps of cleaning of the cleaning kettle, magnetic attraction separation of the magnetic attraction device, drying treatment of the drying medium and the like, and efficient recycling of the magnetic catalyst is achieved. The integrated recycling and drying system is small in occupied area and convenient to move.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic catalyst recovery equipment, in particular to a magnetic catalyst recovery and drying system. Background Art

[0002] Magnetic catalysts are catalysts with magnetic properties that are used to promote chemical reactions. They are usually made by combining catalysts with magnetic materials (such as ferrites, ferromagnetic nanoparticles, etc.) to give them magnetic properties. Magnetic catalysts have many advantages in catalytic reactions, such as easy recycling and reuse, improved reaction efficiency and selectivity, and reduced waste. The position of magnetic catalysts can be controlled by an external magnetic field to achieve precise control and acceleration of the reaction. At the same time, they can be easily recovered and separated by magnetic adsorption after the reaction. This characteristic makes magnetic catalysts have broad application prospects in organic synthesis, environmental protection, wastewater treatment, energy production and other fields.

[0003] Conventional catalysts need to consider the difficulty of recycling in practical applications. Existing magnetic catalysts have certain magnetism while maintaining high catalytic activity. The process of recycling magnetic catalysts using magnetic field force can replace conventional filtering methods, which can not only achieve full resource reuse, but also be environmentally friendly. With the enhancement of environmental awareness and the continuous development of green chemistry, magnetic catalysts are now widely used in the process of petrochemical, bioengineering, sewage treatment and other fields.

[0004] In the existing magnetic catalyst recovery scheme, magnetic separation, cleaning and drying of the magnetic catalyst in the waste liquid are performed separately, and the entire process cannot be operated continuously, resulting in low recovery efficiency of the magnetic catalyst. Utility Model Content

[0005] Aiming at the above problems, the utility model proposes a magnetic catalyst recovery and drying system.

[0006] The technical solution adopted by the utility model is as follows:

[0007] The present application provides a magnetic catalyst recovery and drying system, including a cleaning kettle, a magnetic suction device and a separation device;

[0008] The magnetic suction device is used to separate the magnetic catalyst and the cleaning liquid;

[0009] The magnetic attraction device and the cleaning kettle are connected via a first pipeline;

[0010] The magnetic device is also connected to a second pipeline, and the second pipeline is used to input a drying medium into the magnetic device;

[0011] The separation device is connected to the magnetic attraction device through a third pipeline, and the separation device is used to separate the drying medium and the magnetic catalyst.

[0012] The magnetic catalyst recovery and drying system provided in the present application can continuously and integratedly process the used magnetic catalyst through steps such as cleaning of the cleaning kettle, magnetic separation of the magnetic suction device, and drying treatment of the drying medium, so as to achieve efficient recovery of the magnetic catalyst. The integrated recovery and drying system occupies a small area and is easy to move. In actual use, it is possible to choose to input a drying medium into the magnetic suction device when the magnetic catalyst is in a magnetic suction state to dry the magnetic catalyst, which can improve the uniformity of drying, reduce the moisture content of the magnetic catalyst, and make the magnetic catalyst less likely to agglomerate.

[0013] Furthermore, it also includes a pump and a fourth pipeline, wherein the pump is arranged on the first pipeline, and the first pipeline is used to transport the cleaned magnetic catalyst and cleaning liquid in the cleaning kettle to the magnetic suction device;

[0014] The two ends of the fourth pipeline are connected to the magnetic device and the cleaning kettle respectively, and the fourth pipeline is used to transport the separated cleaning liquid in the magnetic device back to the cleaning kettle;

[0015] The pump is used to pump the cleaning liquid containing the magnetic catalyst in the cleaning kettle to the magnetic suction device.

[0016] By using the fourth pipeline to connect the magnetic suction device and the cleaning kettle, the cleaning liquid separated by the separation device returns to the cleaning kettle, and the magnetic catalyst and the cleaning liquid that are not completely separated can enter the magnetic suction device again through the cleaning kettle and the first pipeline for re-separation, so that the separation effect is improved. That is, the closed-loop connection between the magnetic suction device and the cleaning kettle can allow the magnetic catalyst that has passed through the magnetic suction device and has not been separated to enter the magnetic suction device from the cleaning kettle again for separation, so that the separation efficiency of the magnetic catalyst is further improved.

[0017] In actual use, the recovery quality of the magnetic catalyst by the magnetic catalyst recovery and drying system can be determined by measuring the mass of the magnetic catalyst in the magnetic catalyst collection device and comparing it with the mass of the magnetic catalyst before the reaction.

[0018] Furthermore, the magnetic attraction device has a first inlet, a second inlet, a first outlet and a second outlet;

[0019] The first pipeline is connected to the magnetic attraction device through a first inlet;

[0020] The second pipeline is connected to the magnetic attraction device through a second inlet;

[0021] The third pipeline is connected to the magnetic attraction device through the second outlet;

[0022] The fourth pipeline is connected to the magnetic attraction device through the first outlet.

[0023] Furthermore, the magnetic attraction device includes a plurality of magnetic separation tubes, and the plurality of magnetic separation tubes are arranged in parallel.

[0024] The provision of a plurality of magnetic separation tubes can further achieve continuous cleaning of the magnetic catalyst and improve the efficiency of separation, drying and recovery of the magnetic catalyst.

[0025] Furthermore, the magnetic separation tube includes a tube body and a magnetic attraction rod arranged on the inner wall of the tube body, and the magnetic attraction rod is used to adsorb the magnetic catalyst.

[0026] Furthermore, the magnetic attraction rods include a plurality of magnetic attraction rods, and the plurality of magnetic attraction rods are evenly distributed on the inner wall of the tube body.

[0027] Furthermore, the magnetic rod is an electromagnetic rod. When the magnetic rod is powered on, it generates magnetic attraction to attract the magnetic catalyst. When the magnetic rod is powered off, there is no magnetic attraction, and the attracted magnetic catalyst is released.

[0028] Furthermore, a plurality of branch pipelines are formed at one end of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline connected to the magnetic attraction device, respectively, and the number of the branch pipelines corresponds to the number of the magnetic separation tubes.

[0029] Furthermore, a switch valve is respectively provided on each branch pipeline of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.

[0030] Furthermore, the magnetic attraction device includes two magnetic separation tubes, namely a first magnetic separation tube and a second magnetic separation tube, and the first magnetic separation tube and the second magnetic separation tube respectively have a first inlet, a second inlet, a first outlet and a second outlet;

[0031] The branch pipelines include two, namely a first branch pipeline and a second branch pipeline;

[0032] The first branch pipeline of the first pipeline is connected to the first inlet of the first magnetic separation tube, and a switch valve A is arranged on the first branch pipeline of the first pipeline;

[0033] The second branch pipeline of the first pipeline is connected to the first inlet of the second magnetic separation tube, and a switch valve B is arranged on the second branch pipeline of the first pipeline;

[0034] The first branch pipeline of the fourth pipeline is connected to the first outlet of the first magnetic separation tube, and a switch valve C is arranged on the first branch pipeline of the fourth pipeline;

[0035] The second branch pipeline of the fourth pipeline is connected to the first outlet of the second magnetic separation tube, and a switch valve D is arranged on the second branch pipeline of the fourth pipeline;

[0036] The first branch pipeline of the second pipeline is connected to the second inlet of the first magnetic separation tube, and a switch valve E is arranged on the first branch pipeline of the second pipeline;

[0037] The second branch pipeline of the second pipeline is connected to the second inlet of the second magnetic separation tube, and a switch valve F is arranged on the second branch pipeline of the second pipeline;

[0038] The first branch pipeline of the third pipeline is connected to the second outlet of the first magnetic separation tube, and a switch valve G is arranged on the first branch pipeline of the third pipeline;

[0039] The second branch pipeline of the third pipeline is connected to the second outlet of the second magnetic separation tube, and a switch valve H is arranged on the second branch pipeline of the third pipeline.

[0040] Furthermore, the switch valve may be a solenoid valve.

[0041] Furthermore, it also includes a drying medium source, which is connected to the magnetic attraction device through a second pipeline, and the drying medium source is used to transport drying medium into the magnetic attraction device to dry the magnetic catalyst in the magnetic attraction device.

[0042] Furthermore, the drying medium source is a nitrogen source, and the nitrogen in the nitrogen source is heated nitrogen.

[0043] Furthermore, it also includes a magnetic catalyst collecting device and an exhaust gas collecting device, wherein the magnetic catalyst collecting device is used to receive the magnetic catalyst separated by the separation device, and the exhaust gas collecting device is used to collect the drying medium separated by the separation device.

[0044] Furthermore, a weighing device is included, which is arranged on the magnetic catalyst collecting device and is used to measure the mass of the magnetic catalyst in the magnetic catalyst collecting device so as to compare it with the mass of the magnetic catalyst before the reaction and determine the recovery rate of the magnetic catalyst.

[0045] Furthermore, the cleaning kettle is provided with a stirring blade.

[0046] Furthermore, the separation device is a gas-solid separation device.

[0047] The beneficial effects of the utility model are:

[0048] (1) The magnetic catalyst recovery and drying system provided in the present application can continuously and integratedly process the used magnetic catalyst through the steps of cleaning of the cleaning kettle, magnetic separation of the magnetic suction device, and drying treatment of the drying medium, so as to realize the efficient recovery of the magnetic catalyst. The integrated recovery and drying system occupies a small area and is easy to move. At the same time, by using the fourth pipeline to connect the magnetic suction device and the cleaning kettle, the cleaning liquid separated by the separation device returns to the cleaning kettle, and the magnetic catalyst and the cleaning liquid that are not completely separated can enter the magnetic suction device again through the cleaning kettle and the first pipeline for re-separation, so that the separation effect is improved. When the magnetic catalyst is in the magnetic suction state, the drying medium is input into the magnetic suction device to dry the magnetic catalyst. This can improve the uniformity of drying, reduce the moisture content of the magnetic catalyst, and make the magnetic catalyst not easy to agglomerate.

[0049] (2) Providing multiple magnetic separation tubes can further achieve continuous cleaning of the magnetic catalyst and improve the efficiency of separation, drying and recovery of the magnetic catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of the magnetic catalyst recovery and drying system of the utility model;

[0051] Figure 2 It is a partial structural schematic diagram of the magnetic attraction device of the utility model.

[0052] The reference numerals in the figures are:

[0053] 10. Cleaning kettle; 101. Paddle; 20. Magnetic device; 201. Tube body; 202. Magnetic rod; 203. First magnetic separation tube; 204. Second magnetic separation tube; 30. Drying medium source; 40. Separation device; 51. First pipeline; 52. Fourth pipeline; 53. Second pipeline; 54. Third pipeline; 61. Switch valve A; 62. Switch valve B; 63. Switch valve C; 64. Switch valve D; 65. Switch valve E; 66. Switch valve F; 67. Switch valve G; 68. Switch valve H; 70. Pump; 80. Magnetic catalyst collection device; 90. Tail gas collection device. DETAILED DESCRIPTION

[0054] The utility model is described in detail below in conjunction with the accompanying drawings.

[0055] Example 1

[0056] like Figure 1 and Figure 2 As shown, the present application provides a magnetic catalyst recovery and drying system, including a cleaning kettle 10, a magnetic suction device 20, a separation device 40, a first pipeline 51, a fourth pipeline 52, a second pipeline 53 and a third pipeline 54;

[0057] The cleaning kettle 10 is used to clean the magnetic catalyst;

[0058] The magnetic suction device 20 is used to separate the magnetic catalyst and the cleaning liquid;

[0059] The magnetic device 20 and the cleaning kettle 10 are connected in a closed loop through a first pipeline 51 and a fourth pipeline 52 respectively. The first pipeline 51 is used to transport the cleaned magnetic catalyst and cleaning liquid in the cleaning kettle 10 to the magnetic device 20, and the fourth pipeline 52 is used to transport the separated cleaning liquid in the magnetic device 20 back to the cleaning kettle 10.

[0060] The second pipeline 53 is connected to the magnetic device 20, and the drying medium is input into the magnetic device 20 through the second pipeline 53;

[0061] The separation device 40 is connected to the magnetic attraction device 20 via a third pipeline 54 , and the separation device 40 is used to separate the drying medium and the magnetic catalyst.

[0062] The magnetic catalyst recovery and drying system provided in the present application can continuously and integratedly process the used magnetic catalyst through the steps of cleaning of the cleaning kettle 10, magnetic separation of the magnetic suction device 20, and drying of the drying medium, so as to realize the efficient recovery of the magnetic catalyst. The integrated recovery and drying system occupies less space and is easy to move. At the same time, by using the fourth pipeline 52 to connect the magnetic suction device 20 and the cleaning kettle 10, the cleaning liquid separated by the separation device 40 is returned to the cleaning kettle 10, and the magnetic catalyst and the cleaning liquid that are not completely separated can enter the magnetic suction device 20 again through the cleaning kettle 10 and the first pipeline 51, and be separated again, so that the separation effect is improved. In actual use, it is possible to choose to input the drying medium into the magnetic suction device 20 when the magnetic catalyst is in the magnetic suction state to dry the magnetic catalyst, so that the uniformity of drying can be improved, the moisture content of the magnetic catalyst can be reduced, and the magnetic catalyst is not easy to agglomerate.

[0063] In this embodiment, a pump 70 is further included. The pump 70 is disposed on the first pipeline 51 . The pump 70 is used to pump the cleaning liquid containing the magnetic catalyst in the cleaning kettle 10 to the magnetic suction device 20 .

[0064] In this embodiment, the magnetic attraction device 20 has a first inlet, a second inlet, a first outlet, and a second outlet;

[0065] The first pipeline 51 is connected to the magnetic attraction device 20 through the first inlet;

[0066] The fourth pipeline 52 is connected to the magnetic attraction device 20 through the first outlet;

[0067] The second pipeline 53 is connected to the magnetic attraction device 20 through the second inlet;

[0068] The third pipeline 54 is connected to the magnetic attraction device 20 through the second outlet.

[0069] In this embodiment, the magnetic attraction device 20 includes two magnetic separation tubes, and the two magnetic separation tubes are arranged in parallel.

[0070] In other embodiments, the magnetic suction device 20 may include three or more magnetic separation tubes. The number of magnetic separation tubes actually used is determined based on the capacity of the magnetic separation tubes, the adsorption capacity of the magnetic suction rod 202, and the volume of the magnetic catalyst to be recovered.

[0071] In this embodiment, the magnetic separation tube includes a tube body 201 and a magnetic attraction rod 202 disposed on the inner wall of the tube body 201 , and the magnetic attraction rod 202 is used to adsorb the magnetic catalyst.

[0072] In this embodiment, the magnetic rods 202 include a plurality of magnetic rods 202 , and the plurality of magnetic rods 202 are evenly distributed on the inner wall of the tube body 201 .

[0073] In this embodiment, the magnetic rod 202 is an electromagnetic rod. When the magnetic rod 202 is powered on, a magnetic attraction force is generated to attract the magnetic catalyst. When the magnetic rod 202 is powered off, there is no magnetic attraction force and the attracted magnetic catalyst can be released.

[0074] In this embodiment, the magnetic catalyst is nano-magnetic Fe3O4 particles, and in other embodiments, it can also be other magnetic catalysts that can be magnetically attracted and released by a magnetic rod.

[0075] In this embodiment, the ends of the first pipeline 51 , the fourth pipeline 52 , the second pipeline 53 and the third pipeline 54 connected to the magnetic attraction device 20 are respectively formed with a plurality of branch pipelines, and the number of the branch pipelines corresponds to the number of magnetic separation tubes.

[0076] In this embodiment, a switch valve is respectively disposed on each branch pipeline of the first pipeline 51 , the fourth pipeline 52 , the second pipeline 53 and the third pipeline 54 .

[0077] In this embodiment, the two magnetic separation tubes are the first magnetic separation tube 203 and the second magnetic separation tube 204;

[0078] The branch pipelines include two, namely a first branch pipeline and a second branch pipeline;

[0079] The first branch pipeline of the first pipeline 51 is connected to the first inlet of the first magnetic separation tube 203, and a switch valve A61 is provided on the first branch pipeline of the first pipeline 51;

[0080] The second branch pipeline of the first pipeline 51 is connected to the first inlet of the second magnetic separation tube 204, and a switch valve B62 is provided on the second branch pipeline of the first pipeline 51;

[0081] The first branch pipeline of the fourth pipeline 52 is connected to the first outlet of the first magnetic separation tube 203, and a switch valve C63 is provided on the first branch pipeline of the fourth pipeline 52;

[0082] The second branch pipeline of the fourth pipeline 52 is connected to the first outlet of the second magnetic separation tube 204, and a switch valve D64 is provided on the second branch pipeline of the fourth pipeline 52;

[0083] The first branch pipeline of the second pipeline 53 is connected to the second inlet of the first magnetic separation tube 203, and a switch valve E65 is provided on the first branch pipeline of the second pipeline 53;

[0084] The second branch pipeline of the second pipeline 53 is connected to the second inlet of the second magnetic separation tube 204, and a switch valve F66 is provided on the second branch pipeline of the second pipeline 53;

[0085] The first branch pipeline of the third pipeline 54 is connected to the second outlet of the first magnetic separation tube 203, and a switch valve G67 is provided on the first branch pipeline of the third pipeline 54;

[0086] The second branch pipeline of the third pipeline 54 is connected to the second outlet of the second magnetic separation tube 204 , and a switch valve H68 is provided on the second branch pipeline of the third pipeline 54 .

[0087] In this embodiment, the switch valve can be a solenoid valve. In actual use, a controller is also included, and the controller is connected to the solenoid valve by electrical signals, and the controller can realize automatic opening and closing control of the solenoid valve.

[0088] In this embodiment, a drying medium source 30 is further included. The drying medium source 30 is connected to the magnetic device 20 via a second pipeline 53 . The drying medium source 30 is used to transport drying medium into the magnetic device 20 to dry the magnetic catalyst in the magnetic device 20 .

[0089] In this embodiment, the drying medium source 30 is a nitrogen source, and the nitrogen in the nitrogen source is heated nitrogen.

[0090] In this embodiment, a magnetic catalyst collecting device 80 and an exhaust gas collecting device 90 are also included. The magnetic catalyst collecting device 80 is used to receive the magnetic catalyst separated by the separation device 40, and the exhaust gas collecting device 90 is used to collect the drying medium separated by the separation device 40 to prevent exhaust gas pollution.

[0091] In this embodiment, the magnetic catalyst collecting device 80 is a collecting barrel, which is placed at the outlet of the separation device 40 .

[0092] In this embodiment, a weighing device (not shown in the figure) is also included, and the weighing device is arranged on the magnetic catalyst collecting device.

[0093] In this embodiment, the cleaning kettle 10 is provided with a stirring blade 101 .

[0094] In this embodiment, the separation device 40 is a gas-solid separation device.

[0095] The work flow of the magnetic catalyst recovery and drying system provided in this application includes:

[0096] Inputting the magnetic catalyst to be cleaned into the cleaning kettle 10;

[0097] Open the cleaning kettle 10, and clean the magnetic catalyst by stirring the cleaning kettle 10;

[0098] Turn on the pump 70 and the switch valve A61, pump the cleaning liquid mixed with the magnetic catalyst into the first magnetic separation tube 203, turn on the electromagnetic rod of the first magnetic separation tube 203, and make it generate magnetic attraction to absorb the magnetic catalyst (i.e. magnetic attraction separation process);

[0099] After a period of time, the switch valve A61 is closed, and the switch valve B62 is opened to allow the cleaning liquid to flow back to the cleaning kettle 10. At the same time, the cleaning liquid mixed with the magnetic catalyst is pumped into the second magnetic separation tube 204, and the electromagnetic rod of the second magnetic separation tube 204 is turned on to generate magnetic attraction to adsorb the magnetic catalyst.

[0100] Open the switch valve C63 to drain the cleaning liquid in the first magnetic separation tube 203 and return it (i.e., the cleaning liquid) to the cleaning kettle 10;

[0101] Open the switch valve E65 and the switch valve G67, and introduce hot nitrogen gas, a drying medium, into the first magnetic separation tube 203 to dry the magnetic catalyst in the first magnetic separation tube 203;

[0102] The electromagnetic rod of the first magnetic separation tube 203 is closed to make it lose its magnetic attraction, so that the magnetic catalyst enters the separation device 40 along with the drying medium, and the gas-solid separation is achieved through the separation device 40, and the magnetic catalyst collection device 80 and the tail gas collection device 90 are used to collect the magnetic catalyst and the drying medium;

[0103] During the process of magnetic separation and drying of the magnetic catalyst in the first magnetic separation tube 203, according to the storage and adsorption conditions of the second magnetic separation tube 204, the switch valve B62 is closed in time, and the switch valve D64 is opened to drain the cleaning liquid in the second magnetic separation tube 204 and return it to the cleaning kettle 10;

[0104] Open the switch valve F66 and the switch valve H68, and introduce hot nitrogen gas, a drying medium, into the second magnetic separation tube 204 to dry the magnetic catalyst in the second magnetic separation tube 204;

[0105] The electromagnetic rod of the second magnetic separation tube 204 is closed to make it lose its magnetic attraction, so that the magnetic catalyst enters the separation device 40 along with the drying medium, and the separation device 40 is used to achieve gas-solid separation, and the magnetic catalyst collection device 80 and the tail gas collection device 90 are used to collect the magnetic catalyst and the drying medium;

[0106] During the process of magnetic separation and drying of the magnetic catalyst in the second magnetic separation tube 204, and when the drying medium and magnetic catalyst in the first magnetic separation tube 203 are emptied, the pump 70 and the switch valve A61 are opened in time to pump the cleaning liquid mixed with the magnetic catalyst into the first magnetic separation tube 203, and circulate in sequence until the magnetic catalyst in the cleaning kettle 10 is recovered.

[0107] Example 2

[0108] The difference between this embodiment and embodiment 1 is that in this embodiment, the fourth pipeline and the switch valve C and the switch valve D provided on the branch pipeline of the fourth pipeline are not provided, or the switch valve C and the switch valve D are always kept in a closed state, and the cleaning liquid separated by the separation device does not flow back to the cleaning kettle, and the cleaning liquid in the cleaning kettle can be pumped clean. This embodiment is suitable for the case where the amount of magnetic catalyst in the cleaning liquid is small.

[0109] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A magnetic catalyst recovery and drying system, characterized in that: It includes a cleaning kettle, a magnetic suction device and a separation device; The magnetic suction device is used to separate the magnetic catalyst and the cleaning liquid; The magnetic attraction device and the cleaning kettle are connected via a first pipeline; The magnetic suction device is also connected to a second pipeline, and the second pipeline is used to input a drying medium into the magnetic suction device; The separation device is connected to the magnetic attraction device through a third pipeline, and the separation device is used to separate the drying medium and the magnetic catalyst.

2. A magnetic catalyst recovery and drying system as claimed in claim 1, characterized in that: It also includes a pump and a fourth pipeline, wherein the pump is arranged on the first pipeline, and the first pipeline is used to transport the cleaned magnetic catalyst and cleaning liquid in the cleaning kettle to the magnetic suction device; Both ends of the fourth pipeline are connected to the magnetic device and the cleaning kettle respectively, and the fourth pipeline is used to transport the separated cleaning liquid in the magnetic device back to the cleaning kettle.

3. A magnetic catalyst recovery and drying system as claimed in claim 2, characterized in that: The magnetic attraction device has a first inlet, a second inlet, a first outlet and a second outlet; The first pipeline is connected to the magnetic attraction device through a first inlet; The second pipeline is connected to the magnetic attraction device through a second inlet; The third pipeline is connected to the magnetic attraction device through the second outlet; The fourth pipeline is connected to the magnetic attraction device through the first outlet.

4. A magnetic catalyst recovery and drying system as claimed in claim 2 or 3, characterized in that: The magnetic attraction device comprises a plurality of magnetic separation tubes, and the plurality of magnetic separation tubes are arranged in parallel.

5. A magnetic catalyst recovery and drying system as claimed in claim 4, characterized in that: The magnetic separation tube comprises a tube body and a magnetic attraction rod arranged on the inner wall of the tube body, and the magnetic attraction rod is used for absorbing the magnetic catalyst.

6. A magnetic catalyst recovery and drying system as claimed in claim 5, characterized in that: The magnetic attraction rod is an electromagnetic rod. When the magnetic attraction rod is powered on, a magnetic attraction force is generated to attract the magnetic catalyst. When the magnetic attraction rod is powered off, there is no magnetic attraction force, and the attracted magnetic catalyst is released.

7. A magnetic catalyst recovery and drying system as claimed in claim 4, characterized in that: The ends of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline connected to the magnetic attraction device are respectively formed with a plurality of branch pipelines, and the number of the branch pipelines corresponds to the number of the magnetic separation tubes; A switch valve is respectively arranged on each branch pipeline of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.

8. A magnetic catalyst recovery and drying system as claimed in claim 1, characterized in that: It also includes a drying medium source, which is connected to the magnetic attraction device through a second pipeline.

9. A magnetic catalyst recovery and drying system as claimed in claim 1, characterized in that: It also includes a magnetic catalyst collecting device and an exhaust gas collecting device. The magnetic catalyst collecting device is used to receive the magnetic catalyst separated by the separation device, and the exhaust gas collecting device is used to collect the drying medium separated by the separation device.

10. A magnetic catalyst recovery and drying system as claimed in claim 9, characterized in that: It also includes a weighing device, which is arranged on the magnetic catalyst collecting device.

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