Hydrofluoric acid production plant

Abstract

The present application relates to a kind of hydrofluoric acid production device.The hydrofluoric acid production device includes reaction kettle, reaction kettle includes kettle body, kettle body is equipped with discharge pipe, stop valve is equipped on discharge pipe, liquid outlet is equipped on discharge pipe, storage tank is equipped on discharge pipe, filter screen is equipped in storage tank, connecting pipe is equipped on storage tank, guide rod is connected in discharge pipe, filter cover, upper guide ring assembly and lower guide ring assembly are sleeved on guide rod, lower reset spring is equipped between lower end of lower guide ring assembly and guide rod, lower guide ring assembly and guide rod are matched by screw guide structure, upper reset spring is equipped between upper guide ring assembly and lower guide ring assembly, sealing ring is equipped on the outer end of filter cover, the lower side surface of upper guide ring and the upper side surface of lower guide ring are equipped with matching upper gear ring and lower gear ring respectively.The present application can separate the generated precipitate during reaction, reduce the influence of precipitate on reaction rate;Without additionally adding filter device, reduce equipment cost.

Description

A hydrofluoric acid production device Technical Field

[0001] This invention belongs to the field of hydrofluoric acid production technology, and specifically relates to a hydrofluoric acid production apparatus. Background Technology

[0002] Hydrofluoric acid is used in the production of fluorinated refrigerants, fluorinated resins, accelerators for organic synthesis (polymerization, condensation, alkylation) of fluorinated resins, flame retardants, dye synthesis, and the manufacture of organic or inorganic fluorides, such as fluorocarbons, aluminum fluoride, uranium hexanitride, and cryolite. Hydrofluoric acid is also used as a catalyst in the petroleum industry, in the manufacture of frosted light bulbs, for desanding metal castings, for removing graphite ash, and for cleaning metals. With the relocation of semiconductor chip manufacturing and LCD manufacturing to my country, the domestic consumption of electronic-grade hydrofluoric acid will surge, and the market for electronic-grade hydrofluoric acid undoubtedly has broad development prospects. Hydrofluoric acid is also the main raw material for manufacturing electronic-grade hydrofluoric acid.

[0003] Currently, existing technologies mostly use fluorite and concentrated sulfuric acid mixed and heated in a reactor to prepare hydrofluoric acid. Calcium sulfate is produced during the reaction. Due to the low solubility of calcium sulfate, it easily forms a solid precipitate. When this precipitate coats calcium fluoride, the reaction efficiency is difficult to improve. In actual production, auxiliary filtration devices are often required to improve production efficiency. Adding a filtration device not only increases equipment costs, but also increases the pressure drop in the reaction system and reduces the reaction rate when a large amount of precipitate adheres to the filter. This necessitates extracting the hydrofluoric acid from the filter, diluting the inside of the filter with a large amount of water, and then disassembling the filter to remove the precipitate. This operation is complex, and production cannot continue while cleaning the precipitate, further reducing production efficiency. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a hydrofluoric acid production apparatus.

[0005] The technical solution of the hydrofluoric acid production apparatus of the present invention is as follows:

[0006] A hydrofluoric acid production apparatus includes a reactor, which comprises a reactor body. A discharge pipe is located at the lower end of the reactor body. A shut-off valve is installed on the discharge pipe, and a liquid outlet is located below the shut-off valve. A storage tank communicating with the liquid outlet is located on the outer wall of the discharge pipe. A filter screen is installed inside the storage tank, and a connecting pipe communicating with the discharge pipe is installed on the storage tank. A guide rod is fixedly connected inside the discharge pipe. A filter cover, an upper guide ring assembly, and a lower guide ring assembly are sequentially mounted on the guide rod from top to bottom. A lower return spring is provided between the lower end of the lower guide ring assembly and the guide rod. The lower guide ring assembly and the guide rod are engaged by a spiral guiding structure. An upper return spring is provided between the upper guide ring assembly and the lower guide ring assembly. The filter cover is fixedly connected to the upper guide ring assembly. A sealing ring is provided at the outer end of the filter cover, which slides and seals with the discharge pipe to block the liquid outlet. Matching upper and lower toothed rings are respectively provided on the lower side of the upper guide ring and the upper side of the lower guide ring.

[0007] Furthermore, the outer wall of the guide rod is provided with a mounting groove, and a scraper is hinged in the mounting groove. A torsion spring is provided on the hinge shaft of the scraper so that when the sealing ring seals the liquid outlet, the scraper is driven into the mounting groove by the upper guide ring assembly, and when the sealing ring unseals the liquid outlet, the scraper adheres to the filter cover.

[0008] Furthermore, the upper guide ring assembly includes an upper guide ring, an upper connecting rod, and an upper guide sleeve. The upper guide sleeve matches the guide rod, and the upper guide ring and the upper guide sleeve are arranged coaxially. The two ends of the upper connecting rod are respectively fixedly connected to the upper guide sleeve and the upper guide ring, and the upper gear ring is disposed on the lower side of the upper guide ring.

[0009] Furthermore, the lower guide ring assembly includes a lower guide ring, a lower connecting tube, and a lower guide sleeve. The lower guide sleeve is matched with the guide rod, and the lower guide ring and the lower guide sleeve are arranged coaxially. The two ends of the lower connecting rod are respectively fixedly connected to the lower guide sleeve and the lower guide ring, and the lower gear ring is disposed on the upper side of the lower guide ring.

[0010] Furthermore, the upper end of the lower guide sleeve is provided with a receiving groove, and the lower end of the upper reset spring extends into the receiving groove.

[0011] Furthermore, a fixing ring located below the guide rod is fixedly connected inside the discharge pipe, and a fixing rod is provided inside the fixing ring. The lower end of the guide rod is fixedly connected to the fixing rod.

[0012] Furthermore, the storage box is provided with a support edge for supporting the filter screen, and the storage box is provided with an opening for taking out and putting in the filter screen, and the opening is provided with a sealing plate.

[0013] This invention provides a hydrofluoric acid production apparatus, the advantages of which are:

[0014] The precipitate generated during the reaction can be filtered by the filter cover. When the precipitate becomes too large and clogs the filter cover, the reaction liquid drives the filter cover downwards, the sealing ring unseals the outlet, and the reaction liquid enters the storage tank from the outlet. The precipitate is filtered by the filter screen, and the liquid flows into the discharge pipe through the connecting pipe. The filter cover drives the upper guide ring assembly downwards until the upper and lower gear rings mesh, which in turn drives the lower guide ring assembly downwards and rotates with it. The precipitate on the filter cover enters the storage tank under the action of the filter cover's swing, the impact of the reaction liquid, and the scraper. After the precipitate on the filter cover is cleaned, it rises under the action of the first and second return springs, causing the sealing ring to seal the outlet. At this time, the precipitate on the filter screen can be cleaned. The reaction liquid flowing out of the discharge pipe is pumped into the reactor by the circulating pump. The hydrofluoric acid production device of the present invention can separate the precipitate generated during the reaction, reducing the impact of precipitate on the reaction rate; no additional filtration device is required, reducing equipment costs. In addition, the present invention can automatically clean the precipitate attached to the filter cover, avoiding production stoppages due to precipitate cleaning and improving production efficiency. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the hydrofluoric acid production apparatus according to an embodiment of the present invention;

[0016] Figure 2 is a cross-sectional view of the discharge pipe in the hydrofluoric acid production device according to an embodiment of the present invention;

[0017] Figure 3 is a schematic diagram of the lower guide ring assembly in the hydrofluoric acid production device according to an embodiment of the present invention.

[0018] Figure 4 is a schematic diagram of the upper guide ring assembly in the hydrofluoric acid production device according to an embodiment of the present invention.

[0019] Figure 5 is a schematic diagram of the guide rod in the hydrofluoric acid production device according to an embodiment of the present invention.

[0020] Figure 6 is a schematic diagram of the internal structure of the discharge pipe when the sealing ring is unsealed at the liquid outlet in the hydrofluoric acid production device of this embodiment of the invention.

[0021] Figure 7 is a schematic diagram of the internal structure of the discharge pipe when the sealing ring seals the liquid outlet in the hydrofluoric acid production device according to an embodiment of the present invention.

[0022] Figure 8 is an enlarged view of point A in Figure 6;

[0023] Figure 9 is an enlarged view of point B in Figure 6;

[0024] In the diagram: 1. Reactor body; 2. Feed pipe; 3. Liquid inlet pipe; 4. Drive motor; 5. Discharge pipe; 6. Shut-off valve; 7. Liquid outlet; 8. Storage tank; 9. Sealing plate; 10. Connecting pipe; 11. Opening; 12. Filter screen; 13. Support edge; 14. Fixing ring; 15. Fixing rod; 16. Guide rod; 17. Guide groove; 18. Spiral groove; 19. Lower guide ring; 20. Lower connecting rod; 21. Lower guide sleeve; 22. Lower gear ring; 23. Receiving groove; 24. Upper guide ring; 25. Upper connecting rod; 26. Upper guide sleeve; 27. Upper gear ring; 28. Lower return spring; 29. ​​Upper return spring; 30. Filter cover; 31. Mounting groove; 32. Scraper. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] A specific embodiment of the hydrofluoric acid production apparatus of the present invention is shown in Figures 1 to 9. The apparatus includes a reaction vessel, which comprises a vessel body 1. A feed pipe 2 is welded to the top of the vessel body 1, and a liquid inlet pipe 3 is welded to the upper end of the side wall of the vessel body 1. A stirrer is rotatably mounted inside the vessel body 1, and a drive motor 4 for driving the stirrer is fixedly connected to the upper end of the vessel body 1. A discharge pipe 5 is welded to the bottom of the vessel body 1, and a shut-off valve 6 is installed on the discharge pipe 5.

[0027] Two liquid outlets 7 are provided on the outer wall of the discharge pipe 5 located below the shut-off valve 6. The two liquid outlets 7 are symmetrically arranged about the center face of the discharge pipe 5. Storage tanks 8 are welded to the outer wall of the discharge pipe 5 on the edges of the two liquid outlets 7, and the storage tanks 8 have connecting holes that communicate with the liquid outlets 7. A support edge 13 located below the connecting hole is welded to the inner wall of the storage tank 8, and a filter screen 12 is placed on the support edge 13. The upper side of the filter screen 12 is coplanar with the lower side of the liquid outlet 7 so that the liquid entering the storage tank 8 from the liquid outlet 7 can fall onto the filter screen 12. An opening 11 is provided on the outer wall of the storage tank 8 on the side away from the discharge pipe 5. The lower side of the opening 11 is coplanar with the upper side of the support edge 13, and the upper side is located above the upper side of the filter screen 12. The outer side of the filter screen 12 is coplanar with the outer side of the storage tank 8. A sealing plate 9 sealing the opening 11 is fixedly connected to the outer wall of the storage tank 8 by screws. A connecting pipe 10 is fixedly connected to the lower side of the storage box 8. The lower end of the connecting pipe 10 is fixedly connected to the outer wall of the discharge pipe 5 and communicates with the discharge pipe 5.

[0028] A fixing ring 14 is fixedly connected to the inner wall of the discharge pipe 5. A fixing rod 15 is fixedly connected inside the fixing ring 14. The fixing rod 15 is located on one diameter of the fixing ring 14, and both ends of the fixing rod 15 are welded and fixed to the inner wall of the fixing ring 14. A guide rod 16 is welded to the center of the upper side of the fixing rod 15. A filter cover 30, an upper guide ring assembly, and a lower guide ring assembly are sequentially guided on the guide rod 16 from top to bottom.

[0029] The upper guide ring assembly includes an upper guide ring 24, an upper connecting rod 25, and an upper guide sleeve 26. The upper guide ring 24 is coaxially arranged with the guide rod 16, which is located inside the upper guide ring 24 and along one diameter of the upper guide ring 24. Both ends of the upper guide rod 16 are fixedly connected to the inner wall of the upper guide ring 24, and the upper guide sleeve 26 is fixedly connected to the center of the upper guide rod 16. The inner diameter of the upper guide sleeve 26 is approximately equal to the outer diameter of the guide rod 16, allowing the upper guide sleeve 26 to be guided and fitted onto the guide rod 16. An upper toothed ring 27 is fixedly connected to the lower side of the upper guide ring 24. A filter cover 30 is fixedly connected to the upper end of the upper guide sleeve 26, and a sealing ring is fixedly connected to the outer end of the filter cover 30. The outer side of the sealing ring is tightly fitted against the inner wall of the discharge pipe 5, sealing the liquid outlet 7 on the discharge pipe 5. The guide rod 16 has a guide groove 17 extending vertically, and the inner wall of the upper guide sleeve 26 has a guide strip that matches the guide groove 17, so that the upper guide sleeve 26 can slide up and down along the guide rod 16.

[0030] The lower guide ring assembly includes a lower guide ring 19, a lower connecting rod 20, and a lower guide sleeve 21. The lower guide ring 19 is coaxially arranged with the guide rod 16, which is located inside the lower guide ring 19 and is positioned below one diameter of the lower guide ring 19. Both ends of the lower guide rod 16 are fixedly connected to the inner wall of the lower guide ring 19, and the lower guide sleeve 21 is fixedly connected to the center of the lower guide rod 16. The inner diameter of the lower guide sleeve 21 is substantially equal to the outer diameter of the guide rod 16, allowing the lower guide sleeve 21 to be fitted onto the guide rod 16. A lower gear ring 22 is fixedly connected to the upper side of the lower guide ring 19. The outer diameter of the upper guide ring 24 is equal to the outer diameter of the lower guide ring 19. When the upper guide ring 24 and the lower guide ring 19 are in close contact, the upper gear ring 27 meshes with the lower gear ring 22. The guide rod 16 has a spiral groove 18 located below the guide groove 17, and the inner wall of the lower guide sleeve 21 has a guide post that matches the spiral groove 18. When the lower guide sleeve 21 moves downward, the guide post slides in the spiral groove 18, and the lower guide sleeve 21 rotates.

[0031] A lower return spring 28 and an upper return spring 29 are fitted onto the guide rod 16. The lower end of the lower return spring 28 is fixedly connected to the fixed rod 15, and the upper end abuts against the lower side of the lower guide sleeve 21. The lower return spring 28 is compressed during the downward movement of the lower guide ring assembly. The upper return spring 29 is located between the lower guide sleeve 21 and the upper guide sleeve 26. The upper end of the upper return spring 29 abuts against the upper guide sleeve 26, and the lower end of the upper return spring 29 abuts against the lower guide sleeve 21. In order to ensure that the upper guide sleeve 26 can fit tightly against the lower guide sleeve 21 during the downward movement, the upper end of the lower guide sleeve 21 has a downwardly extending receiving groove 23, and the lower side of the upper return spring 29 is located in the receiving groove 23.

[0032] In this embodiment of the hydrofluoric acid production apparatus, the reaction raw materials are added to the reactor through the feed pipe 2 and the liquid inlet pipe 3. The drive motor 4 is started, driving the stirrer to stir the reaction raw materials in the reactor. After a period of reaction, when some sediment is generated in the reactor, the shut-off valve 6 is opened. The fluid in the reactor flows into the discharge pipe 5, and the sediment in the fluid is filtered by the filter cover 30. The filtered liquid is discharged from the discharge pipe 5 and is transported back to the reactor for further reaction. When there is a lot of sediment attached to the filter cover 30, the pressure on the filter cover 30 increases, and the filter cover 30 drives the upper guide ring assembly to move downward. During this process, the lower guide ring assembly compresses the upper return spring 29. When the upper toothed ring 27 of the upper guide ring assembly meshes with the lower toothed ring 22 of the lower guide ring assembly, the upper guide ring assembly pushes the lower guide ring assembly downward. During the downward movement, the lower guide ring assembly rotates, driving the upper guide ring 24 and the filter cover 30 to rotate. During this process, the sealing ring descends to the lower side of the outlet 7, and the reaction liquid enters the storage tank 8 from the outlet 7. The precipitate is filtered by the filter screen 12, and the liquid flows into the discharge pipe 5 through the connecting pipe 10. As the filter cover 30 rotates, the precipitate on the filter cover 30 enters the storage tank 8 under the action of the swaying and the impact of the reaction liquid. After the precipitate on the filter cover 30 is cleaned, it rises under the action of the first and second return springs, causing the sealing ring to seal the outlet 7. At this time, the precipitate on the filter screen 12 can be cleaned by opening the sealing plate 9.

[0033] In some embodiments, the upper end of the outer wall of the guide rod 16 is provided with two vertically extending mounting grooves 31. When the sealing ring seals the liquid outlet 7, the lower end of the mounting groove 31 is located inside the upper guide sleeve 26. When the sealing ring unseals the liquid outlet 7, the lower end of the mounting groove 31 is located outside the upper guide sleeve 26. A scraper 32 is hinged in the mounting groove 31. The hinge axis between the scraper 32 and the mounting groove 31 is located at the lower end of the mounting groove 31. A torsion spring is installed on the hinge axis between the scraper 32 and the mounting groove 31. When the sealing ring seals the liquid outlet 7, the scraper 32 rotates from the mounting groove 31 under the action of the torsion spring and presses against the filter cover 30. When the filter cover 30 moves upward under the action of the upper return spring 29 and the lower return spring 28, the filter cover 30 and the upper guide sleeve 26 can drive the scraper 32 to rotate into the mounting groove 31.

[0034] When the sealing ring is released from the outlet 7, the scraper 32 adheres tightly to the filter cover 30. During the rotation of the filter cover 30, the scraper 32 can scrape off the sediment attached to the filter cover 30, thereby improving the cleaning effect on the sediment on the filter cover 30.

[0035] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrofluoric acid production apparatus, characterized in that, The apparatus includes a reaction vessel, which comprises a vessel body. A discharge pipe is located at the lower end of the vessel body. A shut-off valve is installed on the discharge pipe. A liquid outlet is located on the outer wall of the discharge pipe, below the shut-off valve. A storage tank, communicating with the liquid outlet, is located on the outer wall of the discharge pipe. A filter screen is installed inside the storage tank. A connecting pipe communicating with the discharge pipe is installed on the storage tank. A guide rod is fixedly connected inside the discharge pipe. A filter cover, an upper guide ring assembly, and a lower guide ring assembly are sequentially mounted on the guide rod from top to bottom. A lower return spring is installed between the lower end of the lower guide ring assembly and the guide rod. The lower guide ring assembly and the guide rod are connected via a spiral guide structure. An upper return spring is installed between the upper guide ring assembly and the lower guide ring assembly. The filter cover is fixedly connected to the upper guide ring assembly. A sealing ring, which slides and seals with the discharge pipe to block the liquid outlet, is located at the outer end of the filter cover. Matching upper and lower toothed rings are respectively provided on the lower side of the upper guide ring and the upper side of the lower guide ring.

2. The hydrofluoric acid production apparatus according to claim 1, characterized in that, The guide rod has an installation groove on its outer wall, and a scraper is hinged in the installation groove. A torsion spring is provided on the hinge shaft of the scraper so that when the sealing ring seals the liquid outlet, the scraper is driven into the installation groove by the upper guide ring assembly, and when the sealing ring unseals the liquid outlet, the scraper adheres to the filter cover.

3. The hydrofluoric acid production apparatus according to claim 2, characterized in that, The upper guide ring assembly includes an upper guide ring, an upper connecting rod, and an upper guide sleeve. The upper guide sleeve matches the guide rod, and the upper guide ring and the upper guide sleeve are arranged coaxially. The two ends of the upper connecting rod are fixedly connected to the upper guide sleeve and the upper guide ring, respectively. The upper gear ring is disposed on the lower side of the upper guide ring.

4. The hydrofluoric acid production apparatus according to claim 3, characterized in that, The lower guide ring assembly includes a lower guide ring, a lower connecting tube, and a lower guide sleeve. The lower guide sleeve is matched with the guide rod, and the lower guide ring and the lower guide sleeve are arranged coaxially. The two ends of the lower connecting rod are fixedly connected to the lower guide sleeve and the lower guide ring, respectively. The lower gear ring is disposed on the upper side of the lower guide ring.

5. The hydrofluoric acid production apparatus according to claim 4, characterized in that, The upper end of the lower guide sleeve is provided with a receiving groove, and the lower end of the upper reset spring extends into the receiving groove.

6. The hydrofluoric acid production apparatus according to claim 4, characterized in that, The discharge pipe is internally fixedly connected to a fixing ring located below the guide rod. The fixing ring contains a fixing rod, and the lower end of the guide rod is fixedly connected to the fixing rod.

7. The hydrofluoric acid production apparatus according to claim 1, characterized in that, The storage box is provided with a support edge for supporting the filter screen, and the storage box is provided with an opening for taking out and putting in the filter screen, and the opening is provided with a sealing plate.

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