Device for recovering residual silver nitrate in EO catalyst

Abstract

The utility model provides a device for recovering residual silver nitrate in an EO catalyst, belongs to the technical field of catalyst treatment, and solves the problems of high working intensity and trouble in transferring the catalyst between a reaction kettle and a filtering device in a reciprocating manner in the prior art. The cleaning device comprises a cleaning tank, a cover plate is arranged on the cleaning tank, the lower surface of the cover plate is connected with a spraying disc, a limiting baffle ring is fixedly arranged on the inner wall of the cleaning tank, a mounting ring is placed on the upper surface of the limiting baffle ring, the inner side of the mounting ring is connected with a screen frame, and a silver ion probe is arranged on the inner wall of the cleaning tank. A catalyst is placed in the screen frame, the catalyst is washed through the spraying disc and then soaked, the drainage pipe is opened to discharge a solution after soaking is completed, washing and soaking of the catalyst are conducted repeatedly, the catalyst does not need to be moved, the working intensity is reduced, the silver ion probe monitors whether cleaning of silver ions is completed or not, and it is guaranteed that the silver ions can be fully recycled.

Description

Technical Field

[0001] This invention belongs to the field of catalyst treatment technology, specifically to a device for recovering residual silver nitrate from EO catalysts. Background Technology

[0002] EO catalysts are catalysts using spherical or cylindrical α-alumina as a support and silver as the active component, used in propane dehydrogenation processes. EO catalysts are typically prepared using an impregnation method, where the support is impregnated in a solution containing silver ions, followed by drying and thermal decomposition. During preparation, co-catalysts (such as barium salts) and inhibitors (such as selenium, tellurium, chlorine, and bromine) can be added to adjust the catalyst's activity and selectivity. The recovery of used EO catalysts is particularly important due to the presence of the valuable precious metal silver.

[0003] The recovery method for this type of catalyst mainly involves leaching the silver from the catalyst with nitric acid, followed by silver precipitation and reduction steps to obtain pure silver. During the leaching process, some silver is adsorbed onto the carrier, which is difficult to remove completely during filtration, resulting in silver waste. To remove the adsorbed silver, multiple rinsing and soaking with water are required. In existing technology, the catalyst is sprayed in the reactor, soaked, and then discharged from the reactor along with the solution. During the discharge of the catalyst and solution, a filtration device is used to separate the catalyst and solution, and then the catalyst in the filtration device is poured back into the reactor for rinsing again. This process of transferring the catalyst between the reactor and the filtration device is labor-intensive and cumbersome. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a device for recovering residual silver nitrate from EO catalysts. The catalyst is placed in a mesh frame, rinsed by a spray plate, and then soaked. After soaking, the solution is drained through a drain pipe. This process of rinsing and soaking the catalyst is repeated without moving the catalyst, thus reducing workload. A silver ion probe monitors whether the silver ions have been completely cleaned, ensuring that the silver ions can be fully recovered.

[0005] The technical solution adopted in this utility model is as follows:

[0006] An apparatus for recovering residual silver nitrate from EO catalyst includes a cleaning tank with a cover plate. A spray plate is connected to the lower surface of the cover plate. A limit ring is fixedly installed on the inner wall of the cleaning tank. An installation ring is placed on the upper surface of the limit ring. A wire mesh frame is connected to the inner side of the installation ring. A silver ion probe is installed on the inner wall of the cleaning tank. The cleaning tank is connected to a drain pipe with a valve installed on the drain pipe.

[0007] Preferably, the upper surface of the spray plate is connected to a connecting pipe that can move through the cover plate, and a nut located above the cover plate is threaded onto the connecting pipe.

[0008] Preferably, the connecting pipe is detachably connected to a flow regulating valve, and the flow regulating valve is connected to an inlet hose.

[0009] Preferably, a rubber block is movably sleeved on the connecting pipe between the spray plate and the cover plate.

[0010] Preferably, the lower surface of the cover plate is provided with a sleeve covering the outside of the spray plate.

[0011] Preferably, the upper end of the cleaning tank is connected to an exhaust pipe, and a filter screen is detachably connected to the exhaust pipe.

[0012] Preferably, an ultrasonic generator is provided at the bottom of the cleaning tank.

[0013] Preferably, the silver ion probe is connected to a display screen located on the outside of the cleaning tank.

[0014] Preferably, the lower surface of the cover plate is provided with an annular rubber pad.

[0015] Preferably, the mounting ring is provided with a first handle, and the cover plate is provided with a second handle.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] The catalyst is placed in a mesh frame and rinsed by a spray plate, then soaked. After soaking, the solution is drained by opening the drain pipe. This process of rinsing and soaking the catalyst is repeated without moving the catalyst, reducing workload. A silver ion probe monitors whether the silver ions have been cleaned, ensuring that the silver ions can be fully recovered. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram provided for an embodiment of the present utility model.

[0020] Reference numerals: 1-Cleaning tank; 2-Limiting ring; 3-First handle; 4-Sleeve; 5-Ultrasonic generator; 6-Drain pipe; 7-Mesh frame; 8-Silver ion probe; 9-Display; 10-Mounting ring; 11-Exhaust pipe; 12-Filter screen; 13-Annular rubber pad; 14-Spray tray; 15-Rubber block; 16-Connecting pipe; 17-Flow regulating valve; 18-Inlet hose; 19-Nut; 20-Second handle; 21-Cover plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] The following is combined with Figure 1 This utility model will be described in detail.

[0025] Example

[0026] An apparatus for recovering residual silver nitrate from an EO catalyst includes a cleaning tank 1, a cover plate 21 on the cleaning tank 1, a spray plate 14 connected to the lower surface of the cover plate 21, a limit ring 2 fixedly installed on the inner wall of the cleaning tank 1, an installation ring 10 placed on the upper surface of the limit ring 2, a mesh frame 7 connected to the inner side of the installation ring 10, a silver ion probe 8 installed on the inner wall of the cleaning tank 1, a drain pipe 6 connected to the cleaning tank 1, and a valve installed on the drain pipe 6.

[0027] The catalyst is placed in the mesh frame 7 and rinsed by the spray plate 14, then soaked. After soaking, the drain pipe 6 is opened to drain the solution. The rinsing and soaking of the catalyst are repeated. The silver ion probe 8 monitors the concentration of silver ions in the solution. If the concentration of silver ions reaches the standard, the rinsing and soaking operation can be stopped. Finally, the cover plate 21 is opened to remove the mesh frame 7 and a new catalyst is replaced for treatment.

[0028] The cover plate 21 can be hinged to the upper end of the cleaning tank 1 or the cover plate 21 can be detachably connected to the cleaning tank 1. In this application, the cover plate 21 is placed directly on the cleaning tank 1, so as to facilitate the removal of the cover plate 21.

[0029] The upper surface of the spray plate 14 is connected to a connecting pipe 16 that extends through the cover plate 21. A nut 19 is threaded onto the connecting pipe 16 and located above the cover plate 21. The nut 19, fitted onto the connecting pipe 16, allows the spray plate 14 to be suspended below the cover plate 21. When cleaning or replacing the spray plate 14 is required, the nut 19 can be removed to take out the spray plate 14, making the operation simple.

[0030] A flow regulating valve 17 is detachably connected to the connecting pipe 16, and the flow regulating valve 17 is connected to an inlet hose 18. The flow regulating valve 17 can adjust the water flow and open / close the inlet hose 18 as needed. Both ends of the flow regulating valve 17 are equipped with rigid pipes; one end of the flow regulating valve 17 is connected to the inlet hose 18 via a plug, and the other end of the flow regulating valve 17 is threaded to the connecting pipe 16. When disassembling the spray plate 14, the inlet hose 18 must be removed first, then the flow regulating valve 17 must be unscrewed, and finally the nut 19 must be unscrewed.

[0031] A rubber block 15 is movably sleeved on the connecting pipe 16, located between the spray plate 14 and the cover plate 21. The rubber block 15, together with the nut 19, can restrict the position of the spray plate 14, preventing the spray plate 14 from sliding up and down during the movement of the cover plate 21, which would cause the spray plate 14 to hit the cover plate 21 and be damaged.

[0032] A sleeve 4 is provided on the lower surface of the cover plate 21, which covers the outside of the spray plate 14. The sleeve 4 can prevent the spray plate 14 from being damaged by impact with the cleaning tank 1 during the placement of the cover plate 21. At the same time, the sleeve 4 can serve as a guide component for the cover plate 21. The outer wall of the sleeve 4 fits against the inner wall of the cleaning tank 1 to ensure that the cover plate 21 is placed in the right position and to prevent the cover plate 21 from sliding laterally.

[0033] The upper end of the cleaning tank 1 is connected to an exhaust pipe 11, and a filter screen 12 is detachably connected to the exhaust pipe 11. During the rinsing process, dust will be raised on the catalyst. To prevent dust from overflowing from the cleaning tank 1 and causing environmental pollution, the filter screen 12 is installed to filter the dust. The exhaust pipe 11 is L-shaped to prevent the sprayed water from splashing into the exhaust pipe 11 and flowing out of the cleaning tank 1. The filter screen 12 is connected to the upper end face of the exhaust pipe 11 by a screw, which facilitates disassembly and assembly.

[0034] An ultrasonic generator 5 is installed at the bottom of the cleaning tank 1. The ultrasonic generator 5 can perform ultrasonic cleaning on the catalyst during the immersion process, thereby increasing the cleaning effect.

[0035] The silver ion probe 8 is connected to a display screen 9 located on the outside of the cleaning tank 1. The display screen 9 allows operators to easily view the values ​​monitored by the silver ion probe 8.

[0036] An annular rubber pad 13 is provided on the lower surface of the cover plate 21. After the cover plate 21 covers the cleaning tank 1, the upper end face of the cleaning tank 1 fits against the annular rubber pad 13, thereby sealing the gap between the cover plate 21 and the cleaning tank 1 and preventing dust leakage. At the same time, the rubber block 15 also seals the gap between the connecting pipe 16 and the cover plate 21, ensuring that the air in the cleaning tank 1 can only be discharged from the exhaust pipe 11.

[0037] The mounting ring 10 is equipped with a first handle 3, and the cover plate 21 is equipped with a second handle 20, so that the operator can use the handles to remove the cover plate 21 and the wire frame 7.

[0038] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An apparatus for recovering residual silver nitrate from EO catalyst, comprising a cleaning tank (1), characterized in that, The cleaning tank (1) is provided with a cover plate (21), the lower surface of the cover plate (21) is connected to a spray plate (14), the inner wall of the cleaning tank (1) is fixedly provided with a limit ring (2), the upper surface of the limit ring (2) is placed with an installation ring (10), the inner side of the installation ring (10) is connected with a wire mesh frame (7), the inner wall of the cleaning tank (1) is provided with a silver ion probe (8), the cleaning tank (1) is connected with a drain pipe (6), and a valve is provided on the drain pipe (6).

2. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 1, characterized in that, The upper surface of the spray plate (14) is connected to a connecting pipe (16) that can move through the cover plate (21), and a nut (19) located above the cover plate (21) is threaded on the connecting pipe (16).

3. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 2, characterized in that, The connecting pipe (16) is detachably connected to a flow regulating valve (17), and the flow regulating valve (17) is connected to an inlet hose (18).

4. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 2, characterized in that, A rubber block (15) is movably sleeved on the connecting pipe (16) between the spray plate (14) and the cover plate (21).

5. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 1, characterized in that, The lower surface of the cover plate (21) is provided with a sleeve (4) covering the outside of the spray plate (14).

6. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 1, characterized in that, The upper end of the cleaning tank (1) is connected to an exhaust pipe (11), and a filter screen (12) is detachably connected to the exhaust pipe (11).

7. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 1, characterized in that, An ultrasonic generator (5) is installed at the bottom of the cleaning tank (1).

8. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 1, characterized in that, The silver ion probe (8) is connected to a display screen (9) located outside the cleaning tank (1).

9. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 1, characterized in that, The lower surface of the cover plate (21) is provided with an annular rubber pad (13).

10. The apparatus for recovering residual silver nitrate from EO catalyst according to claim 1, characterized in that, The mounting ring (10) is provided with a first handle (3), and the cover plate (21) is provided with a second handle (20).

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