Separation and purification device for 8-hydroxyquinoline crystallization

Abstract

The invention relates to the technical field of separation and purification devices, in particular to a separation and purification device for 8-hydroxyquinoline crystallization. The device comprises a crystallization kettle used for cooling an 8-hydroxyquinoline solution, a stirring assembly is arranged in the crystallization kettle, the stirring assembly is provided with a plurality of cleaning assemblies in the radial direction of the crystallization kettle, each cleaning assembly comprises a scraping part and a pneumatic part, the scraping parts are slidably connected to the side, close to the inner wall of the crystallization kettle, of the stirring assembly, and the pneumatic parts are arranged on the scraping parts. The pneumatic part is used for pushing the scraping part to be close to the inner wall of the crystallization kettle; the increased air pressure in the pressure-bearing cavity pushes the pressure-bearing plate to slide towards one side close to the contraction groove, the telescopic arm is pushed out of the contraction groove through the sliding rod, and due to the fact that large air pressure is accumulated in the pressure-bearing cavity before the telescopic arm stretches out of the contraction groove, the conical part is inserted into the crystal above the liquid level at the moment that the top of the contraction groove is completely out of shielding of the installation groove. The telescopic arm instantly releases large force, and it can be ensured that the conical part is inserted into crystals tightly combined with the inner wall of the crystallization kettle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of separation and purification devices, in particular to a separation and purification device for 8-hydroxyquinoline crystals. BACKGROUND

[0002] The 8-hydroxyquinoline crystals obtained by purifying the 8-hydroxyquinoline crude product need to go through the following process flow: heating and dissolving, filtering while hot, cooling and crystallizing, and filtering again. When the hot saturated solution of 8-hydroxyquinoline filtered while hot is injected into the crystallization kettle for the cooling and crystallizing stage, the crystals will preferentially precipitate near the inner wall of the crystallization kettle and adhere to it when the hot saturated solution cools below the crystallization temperature. Since the stirring structure does not have a cleaning function, manual cleaning or the need to disassemble and re-install the cleaning device is generally used.

[0003] In related technologies, the patent for invention with the publication number CN115920443B discloses a sodium molybdate shrinkage crystallization reaction kettle with a cleaning mechanism, and the technical solution points are as follows: a cleaning component is arranged in the stirring seat, the cleaning component can be extended and rotated to clean the inner wall, and a closed structure can be formed between the supporting spring and the baffle, so that the cleaning component is accommodated in the accommodation groove, the stirring function of the stirring device is facilitated, the cleaning component is not affected, and the need to disassemble and re-install the cleaning device is avoided.

[0004] Although the above-mentioned crystallization reaction kettle can achieve the functions of stirring and cleaning by arranging the cleaning component in the stirring seat, the installation height of the stirring seat usually needs to be completely below the liquid level for the purpose of ensuring the stirring effect and process safety. During the stirring process, the liquid level forms a vortex with "high edges and low center", and when the crystallization is completed and the stirring is stopped, the highest point of the crystals precipitated on the side wall will be higher than the liquid level, so that the crystals above the liquid level cannot be scraped off into the solution during the subsequent scraping of the crystals by the cleaning component, thereby causing waste of the crystals. Moreover, the crystallization on the inner wall above the liquid level is combined more tightly with the inner wall of the crystallization kettle than the crystallization below the liquid level due to the evaporation effect of the solvent, and only simple scraping will still leave a large amount of crystallization on the inner wall above the liquid level.

[0005] In view of this, we propose a separation and purification device for 8-hydroxyquinoline crystals to improve the deficiencies in the prior art. SUMMARY

[0006] The present application provides a separation and purification device for 8-hydroxyquinoline crystals, which solves the problem that during the stirring process, the liquid level forms a vortex with "high edges and low center", and when the crystallization is completed and the stirring is stopped, the highest point of the crystals precipitated on the side wall will be higher than the liquid level, that is: When the cleaning assembly scrapes the crystal, the crystal above the liquid level cannot be scraped into the solution, resulting in waste of the crystal.

[0007] To achieve the above object, the device for separating and purifying 8-hydroxyquinoline crystals comprises a crystallization kettle for cooling 8-hydroxyquinoline solution, the crystallization kettle is internally provided with a stirring assembly, the stirring assembly is radially provided with a plurality of cleaning assemblies along the crystallization kettle, the cleaning assembly comprises a scraping member and a pneumatic member, the scraping member is slidingly connected to one side of the stirring assembly close to the inner wall of the crystallization kettle, and the pneumatic member is used to push the scraping member close to the inner wall of the crystallization kettle. Both upper and lower ends of the scraping member are movably connected with extension assemblies, the extension assembly comprises a pressure-bearing member for communicating with the pneumatic member and a working member with a prismatic cross section. During the crystallization process, the scraping member is away from the inner wall of the crystallization kettle, after the crystallization is completed, the pneumatic member pushes the scraping member close to the inner wall of the crystallization kettle, and after the crystallization of the inner wall of the crystallization kettle is scraped, the crystals attached to the surface of the retracted scraping member can be scraped by the stirring assembly. At the moment when the scraping member is close to the inner wall of the crystallization kettle, the working member upwardly away from the scraping member is used to insert into the crystals above the liquid level, and the working member lubricates the crystals and the inner wall of the crystallization kettle with the solution, and during the process of scraping the crystals above the liquid level by the working member, the working member guides the solution to flow into the crystals.

[0008] In the above technical solution, the extension assembly comprises a contraction groove and a pressure-bearing cavity opened on the scraping strip, the contraction groove is communicated with the outside of the mounting groove, the contraction groove and the pressure-bearing cavity are not communicated, the pressure-bearing cavity is communicated with the inside of the mounting groove, the pressure-bearing member comprises a pressure-bearing plate slidingly connected in the pressure-bearing cavity, and the working member comprises a telescopic arm slidingly connected in the contraction groove.

[0009] The telescopic arm and the pressure-bearing plate are fixedly connected with a sliding rod, a second spring is sleeved on the sliding rod outside the pressure-bearing cavity, and the second spring is used to reset the telescopic arm extending out of the contraction groove.

[0010] The telescopic arm comprises a rectangular portion fixedly connected with the sliding rod, a tapered portion is arranged at the top of the rectangular portion, a plurality of drainage channels are opened in the telescopic arm, the inlet of the drainage channel is located in the rectangular portion, and the outlet of the drainage channel is located in the tapered portion.

[0011] In another technical solution, when the scraping strip is retracted inside the installation groove, the telescopic arm is also retracted inside the retraction groove under the pressing of the inner wall of the installation groove. With the air pump blowing air into the installation groove through the cavities inside the main rod and the extension rod, the air pressure in the installation groove increases, pushing the scraping strip out of the installation groove. Since the pressure bearing cavity is in communication with the inside of the installation groove, the air pressure in the pressure bearing cavity also increases. When the scraping strip slides to closely adhere to the inside of the crystallizer, at this time the top of the retraction groove completely loses the shielding of the installation groove, and the increased air pressure in the pressure bearing cavity pushes the pressure bearing plate to slide to the side close to the retraction groove. The telescopic arm is pushed out of the retraction groove through the slide rod. Since a large air pressure has been accumulated in the pressure bearing cavity before the telescopic arm is extended out of the retraction groove, at the moment when the top of the retraction groove completely loses the shielding of the installation groove, the conical part is inserted into the crystal above the liquid surface. The telescopic arm instantaneously releases a large force, which can ensure that the conical part is inserted into the crystal that is closely combined with the inner wall of the crystallizer. At the same time, the top inclined surface of the conical part also contacts the liquid and the crystal, playing a lubricating role.

[0012] In the process of the telescopic arm following the scraping strip to scrape the crystal above the liquid surface, the solution flows into the inlet of the drainage channel located in the lower rectangular part, and then flows out of the outlet located in the upper conical part, so that the solution is continuously introduced between the crystal and the inner wall of the crystallizer during the scraping process.

[0013] Based on the above description, the beneficial effects of the present application compared with the prior art are: With the air pump blowing air into the installation groove through the cavities inside the main rod and the extension rod, the air pressure in the installation groove increases. Since the pressure bearing cavity is in communication with the inside of the installation groove, the air pressure in the pressure bearing cavity also increases. When the scraping strip slides to closely adhere to the inside of the crystallizer, at this time the top of the retraction groove completely loses the shielding of the installation groove, and the increased air pressure in the pressure bearing cavity pushes the pressure bearing plate to slide to the side close to the retraction groove. The telescopic arm is pushed out of the retraction groove through the slide rod. Since a large air pressure has been accumulated in the pressure bearing cavity before the telescopic arm is extended out of the retraction groove, at the moment when the top of the retraction groove completely loses the shielding of the installation groove, the conical part is inserted into the crystal above the liquid surface. The telescopic arm instantaneously releases a large force, which can ensure that the conical part is inserted into the crystal that is closely combined with the inner wall of the crystallizer. At the same time, the top inclined surface of the conical part also contacts the liquid and the crystal, playing a lubricating role.

[0014] In the process of the telescopic arm following the scraping strip to scrape the crystal above the liquid surface, the solution flows into the inlet of the drainage channel located in the lower rectangular part, and then flows out of the outlet located in the upper conical part, so that the solution is continuously introduced between the crystal and the inner wall of the crystallizer during the scraping process, thereby reducing the adhesion between the crystal and the crystallizer. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate embodiments of the present application and explain the present application, and do not constitute a limitation of the present application. In the drawings: Figure 1 is a perspective view of the overall structure of the present application; Figure 2 is a perspective view of the stirring stage of the present application; Figure 3 is a perspective view of the cleaning stage of the present application; Figure 4 is an exploded perspective view of the stirring assembly of the present application; Figure 5 is a perspective view of the cleaning assembly of the present application; Figure 6 is a perspective view of the cleaning assembly of the present application; Figure 7 is a perspective view of the cleaning assembly of the present application; Figure 8 is a perspective view of the extension assembly of the present application; Figure 9 is a perspective view of the Figure 8 is an enlarged view of A in the figure; Figure 10 is a perspective view of the extension assembly of the present application; Figure 11 is a perspective view of the extension assembly of the present application;

[0016] The components represented by the respective numbers in the figures are: 100, crystallizer; 200, stirring assembly; 210, main rod; 220, extension rod; 230, stirring seat; 300, cleaning assembly; 310, mounting groove; 320, air pump; 330, scraping strip; 340, first spring; 400, extension assembly; 410, retraction groove; 420, pressure receiving cavity; 430, telescopic arm; 431, rectangular portion; 432, tapered portion; 433, drainage channel; 440, pressure receiving plate; 450, sliding rod; 460, second spring. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0018] For the crystallization of the inner wall above the liquid surface, due to the evaporation effect of the solvent, the crystallization here is combined more tightly with the inner wall of the crystallizer than the crystallization below the liquid surface. Only relying on simple scraping will still leave more crystallization on the inner wall above the liquid surface. For details, please refer to Figures 1-3.

[0019] The embodiment is aimed to provide a separation and purification device for 8-hydroxyquinoline crystal, which comprises a crystallization kettle 100 for cooling 8-hydroxyquinoline solution, a stirring assembly 200 arranged inside the crystallization kettle 100, and a plurality of cleaning assemblies 300 arranged along the radial direction of the crystallization kettle 100 and comprising a scraping member and a pneumatic member, wherein the scraping member is slidingly connected to one side of the stirring assembly 200 close to the inner wall of the crystallization kettle 100, and the pneumatic member is used to push the scraping member close to the inner wall of the crystallization kettle 100. The upper and lower ends of the scraping member are movably connected with extension assemblies 400, and the extension assemblies 400 comprise a pressure-bearing member for communicating with the pneumatic member and a working member with a prismatic cross section. During the crystallization process, the scraping member is away from the inner wall of the crystallization kettle 100, and after the crystallization is completed, the pneumatic member pushes the scraping member to tightly adhere to the inner wall of the crystallization kettle 100, and when the inner wall of the crystallization kettle 100 is scraped, the crystals attached to the surface of the retracting scraping member can be scraped by the stirring assembly 200. At the moment when the scraping member tightly adheres to the inner wall of the crystallization kettle 100, the upward working member is away from the scraping member, is used to insert into the crystals above the liquid surface, and the working member lubricates the crystals and the inner wall of the crystallization kettle 100 by driving the solution, and in the process of scraping the crystals above the liquid surface by the working member, the working member guides the solution to flow into the crystals.

[0020] As shown in Figure 4 The stirring assembly 200 comprises a main rod 210 arranged at the axis of the crystallization kettle 100, a plurality of extension rods 220 fixedly connected to the main rod 210 in the radial direction, and the extension rods 220 are distributed at different axial heights of the main rod 210, and one end of the extension rod 220 away from the main rod 210 is fixedly connected with a stirring seat 230.

[0021] The improvement lies in that the stirring seat 230 is below the liquid surface, and the stirring seat 230 has a spacing with the inner wall of the crystallization kettle 100.

[0022] Furthermore, the main rod 210, the extension rod 220 and the stirring seat 230 are all hollow structures.

[0023] It should be noted that the main rod 210 is driven by a belt, a belt pulley, a motor and a bearing structure, the main rod 210 drives the stirring seat 230 to rotate, accelerates the cooling of the 8-hydroxyquinoline hot saturated solution in the crystallization kettle 100, and the spacing between the stirring seat 230 and the inner wall of the crystallization kettle 100 ensures that the 8-hydroxyquinoline can form crystals with larger particles and complete structure on the inner wall of the crystallization kettle 100, so as to facilitate the subsequent re-filtering step.

[0024] In Figures 5-7In the embodiment, the cleaning assembly 300 comprises a mounting groove 310 formed in the stirring seat 230, the pneumatic member comprises a gas pump 320 connected to the top of the main rod 210, the stirring seat 230 is open towards the inner wall of the crystallizer 100, and the scraping member comprises a scraping strip 330 slidingly connected in the mounting groove 310.

[0025] Further, the scraping strip 330 is provided with a plurality of first springs 340 on the side towards the axis of the crystallizer 100, the first springs 340 are located in the mounting groove 310, and the first springs 340 are used to drive the scraping strip 330 sliding out of the mounting groove 310 to reset.

[0026] Further, the outer wall of the scraping strip 330 is tightly attached to the edge of the inner wall of the opening of the mounting groove 310.

[0027] That is, the opening of the gas pump 320 is rotationally connected with the inner wall of the cavity of the main rod 210 and is sealed by an "O" sealing gasket, when the crystallization is completed, the gas pump 320 blows gas into the mounting groove 310, so that the gas pressure in the mounting groove 310 is increased and the scraping strip 330 is pushed to slide out of the mounting groove 310 until the scraping strip 330 is tightly attached to the inner wall of the crystallizer 100, the scraping strip 330 rotates around the main rod 210 synchronously with the stirring seat 230, so that the crystals (the part below the liquid surface) on the inner wall of the crystallizer 100 are scraped off, during which the first springs 340 are deformed and store elastic potential energy. When the scraping of the crystals on the inner wall of the crystallizer 100 is completed, the first springs 340 release the elastic potential energy, drive the scraping strip 330 to retract into the mounting groove 310, and meanwhile the mounting groove 310 scrapes off the crystals attached to the outer wall of the scraping strip 330.

[0028] Based on the above description, the preferred effects of the extension assembly 400 will be explained below in combination with Figures 8-11 The extension assembly 400 comprises a retraction groove 410 and a pressure bearing cavity 420 formed in the scraping strip 330, the retraction groove 410 is communicated with the outside of the mounting groove 310, the retraction groove 410 and the pressure bearing cavity 420 are not communicated with each other, the pressure bearing cavity 420 is communicated with the inside of the mounting groove 310, the pressure bearing member comprises a pressure bearing plate 440 slidingly connected in the pressure bearing cavity 420, and the working member comprises a telescopic arm 430 slidingly connected in the retraction groove 410.

[0029] The improvement is that the telescopic arm 430 and the pressure bearing plate 440 are fixedly connected with a sliding rod 450, the sliding rod 450 is sleeved with a second spring 460 in the pressure bearing cavity 420, and the second spring 460 is used to drive the telescopic arm 430 extending out of the retraction groove 410 to reset.

[0030] In addition, the telescopic arm 430 and the pressure bearing plate 440 are fixedly connected with the sliding rod 450, the sliding rod 450 is sleeved with the second spring 460 in the pressure bearing cavity 420, and the second spring 460 is used to drive the telescopic arm 430 extending out of the retraction groove 410 to reset.

[0031] In particular, the telescopic arm 430 comprises a rectangular part 431 fixedly connected with the slide rod 450, the top of the rectangular part 431 is provided with a tapered part 432, and a plurality of drainage channels 433 are arranged in the telescopic arm 430, the inlet of the drainage channels 433 is located in the rectangular part 431, and the outlet of the drainage channels 433 is located in the tapered part 432.

[0032] It should be noted that when the scraping strip 330 is retracted in the installation groove 310, the telescopic arm 430 is also retracted in the contraction groove 410 under the pressing of the inner wall of the installation groove 310, along with the fact that the air pump 320 blows air into the installation groove 310 through the cavity in the main rod 210 and the extension rod 220, the air pressure in the installation groove 310 increases, the scraping strip 330 is pushed out of the installation groove 310, since the pressure bearing cavity 420 is in communication with the inside of the installation groove 310, the air pressure in the pressure bearing cavity 420 also increases, when the scraping strip 330 slides to be close to the inside of the crystallizer 100, at this time, the top of the contraction groove 410 is completely shielded from the installation groove 310, the air pressure in the pressure bearing cavity 420 pushes the pressure bearing plate 440 to slide to the side close to the contraction groove 410, and the telescopic arm 430 is pushed out of the contraction groove 410 through the slide rod 450, since a large air pressure has been accumulated in the pressure bearing cavity 420 before the telescopic arm 430 is extended out of the contraction groove 410, at the moment when the top of the contraction groove 410 is completely shielded from the installation groove 310, the tapered part 432 is inserted into the crystal above the liquid surface, and the telescopic arm 430 instantaneously releases a large force, so that the tapered part 432 can be inserted into the crystal combined closely with the inner wall of the crystallizer 100, and the top inclined surface of the tapered part 432 also contacts the liquid and the crystal, thereby playing a lubricating role.

[0033] In the process that the telescopic arm 430 follows the scraping strip 330 to scrape the crystal above the liquid surface, the solution flows into the drainage channels 433 from the inlet of the lower rectangular part 431 and then flows out from the outlet of the upper tapered part 432, so that the solution is continuously introduced between the crystal and the inner wall of the crystallizer 100 in the process of scraping, thereby reducing the adhesion between the crystal and the crystallizer 100, and making the crystal above the liquid surface more easily scraped into the solution.

[0034] In summary, the working principle of the present application is as follows: Firstly, the hot saturated solution of 8-hydroxyquinoline is injected into the crystallizer 100 to cool and crystallize, and during the period, the solution cooling is accelerated by the stirring seat 230, and the crystallization speed of 8-hydroxyquinoline is improved.

[0035] When the crystallization is completed, the air pump 320 blows air into the installation groove 310, so that the air pressure in the installation groove 310 increases and pushes the scraper 330 out of the installation groove 310 until the scraper 330 closely adheres to the inner wall of the crystallization kettle 100. The scraper 330 rotates around the main rod 210 synchronously with the stirring seat 230, so that the crystals on the inner wall of the crystallization kettle 100 are scraped off. During this period, the first spring 340 is deformed and stores elastic potential energy. When the scraping of the crystals on the inner wall of the crystallization kettle 100 is completed, the first spring 340 releases the elastic potential energy, drives the scraper 330 to retract into the installation groove 310, and at the same time, the installation groove 310 scrapes off the crystals adhering to the outer wall of the scraper 330.

[0036] When the scraper 330 is retracted into the installation groove 310, the telescopic arm 430 is also retracted into the contraction groove 410 under the pressing of the inner wall of the installation groove 310. With the air pump 320 blowing air into the installation groove 310 through the cavities in the main rod 210 and the extension rod 220, the air pressure in the installation groove 310 increases, pushing the scraper 330 out of the installation groove 310. Since the pressure bearing cavity 420 is in communication with the inside of the installation groove 310, the air pressure in the pressure bearing cavity 420 also increases. When the scraper 330 slides to closely adhere to the inside of the crystallization kettle 100, at this time, the top of the contraction groove 410 completely loses the shielding of the installation groove 310, and the increased air pressure in the pressure bearing cavity 420 pushes the pressure bearing plate 440 to slide towards the side close to the contraction groove 410, pushing the telescopic arm 430 out of the contraction groove 410 through the slide rod 450. Since a large air pressure has been accumulated in the pressure bearing cavity 420 before the telescopic arm 430 is extended out of the contraction groove 410, at the moment when the top of the contraction groove 410 completely loses the shielding of the installation groove 310, the tapered portion 432 is inserted into the crystals above the liquid surface, and the telescopic arm 430 instantaneously releases a large force, which can ensure that the tapered portion 432 is inserted into the crystals closely combined with the inner wall of the crystallization kettle 100. At the same time, the top inclined surface of the tapered portion 432 also contacts the liquid and the crystals, playing a lubricating role.

[0037] During the process of the telescopic arm 430 scraping the crystals above the liquid surface along with the scraper 330, the solution flows into the contraction groove 410 from the inlet of the lower rectangular portion 431 and then flows out from the outlet of the upper tapered portion 432, so that the solution is continuously introduced between the crystals and the inner wall of the crystallization kettle 100 during the scraping process, reducing the adhesion between the crystals and the inner wall of the crystallization kettle 100, so that the crystals above the liquid surface are more easily scraped off into the solution.

[0038] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A separation and purification apparatus for 8-hydroxyquinoline crystallization, comprising a crystallization vessel (100) for cooling an 8-hydroxyquinoline solution, wherein a stirring assembly (200) is provided inside the crystallization vessel (100), and the stirring assembly (200) is provided with a plurality of cleaning components (300) radially along the crystallization vessel (100), wherein the cleaning components (300) include a scraper and a pneumatic component, the scraper being slidably connected to the side of the stirring assembly (200) near the inner wall of the crystallization vessel (100), and the pneumatic component being used to push the scraper closer to the inner wall of the crystallization vessel (100), characterized in that: Both ends of the scraper are movably connected to an extension assembly (400), and the extension assembly (400) includes a pressure-bearing component for connecting the pneumatic component and a working component with a prismatic cross section. During the crystallization process, the scraper moves away from the inner wall of the crystallization vessel (100). After crystallization is completed, the pneumatic component pushes the scraper to stick to the inner wall of the crystallization vessel (100). When the crystals on the inner wall of the crystallization vessel (100) are scraped off, the crystals attached to the surface of the retracted scraper can be scraped off by the stirring component (200). At the instant the scraper is pressed against the inner wall of the crystallization vessel (100), the upward working part moves away from the scraper and is used to insert into the crystal located above the liquid surface. The working part drives the solution to lubricate the crystal and the inner wall of the crystallization vessel (100). During the process of the working part scraping the crystal above the liquid surface, the working part guides the solution to flow into the crystal.

2. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 1, characterized in that: The stirring assembly (200) includes a main rod (210) located at the axis of the crystallizing vessel (100). The main rod (210) is radially fixedly connected to a plurality of extension rods (220), and the plurality of extension rods (220) are evenly distributed at different heights along the axial direction of the main rod (210). The end of the extension rod (220) away from the main rod (210) is fixedly connected to a stirring seat (230).

3. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 2, characterized in that: The stirring seat (230) is located below the liquid surface, and there is a gap between the stirring seat (230) and the inner wall of 110.

4. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 2, characterized in that: The main rod (210), extension rod (220) and stirring seat (230) are all hollow structures.

5. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 2, characterized in that: The cleaning component (300) includes a mounting groove (310) formed in the stirring seat (230), the pneumatic component includes an air pump (320) connected to the top of the main rod (210), the opening of the stirring seat (230) faces the inner wall of the crystallizing vessel (100), and the scraping component includes a scraper (330) slidably connected in the mounting groove (310).

6. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 5, characterized in that: The scraper (330) is provided with a plurality of first springs (340) on the side facing the axis of the crystallization vessel (100). The first springs (340) are located in the mounting groove (310) and are used to drive the scraper (330) that has slid out of the mounting groove (310) to reset.

7. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 5, characterized in that: The outer wall of the scraper (330) is in close contact with the edge of the inner wall of the opening of the mounting groove (310).

8. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 5, characterized in that: The extension assembly (400) includes a shrinkage groove (410) and a pressure chamber (420) formed on the scraper (330). The shrinkage groove (410) is connected to the outside of the mounting groove (310). The shrinkage groove (410) and the pressure chamber (420) are not connected. The pressure chamber (420) is connected to the inside of the mounting groove (310). The pressure-bearing component includes a pressure plate (440) slidably connected in the pressure chamber (420). The working component includes a telescopic arm (430) slidably connected in the shrinkage groove (410).

9. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 8, characterized in that: A slide rod (450) is fixedly connected between the telescopic arm (430) and the pressure plate (440). A second spring (460) is sleeved around the slide rod (450) inside the pressure cavity (420). The second spring (460) is used to drive the telescopic arm (430) that extends out of the contraction groove (410) to reset.

10. The separation and purification apparatus for 8-hydroxyquinoline crystallization according to claim 9, characterized in that: The telescopic arm (430) includes a rectangular portion (431) fixedly connected to a slide rod (450). The top of the rectangular portion (431) is provided with a tapered portion (432). Multiple drainage channels (433) are provided inside the telescopic arm (430). The inlet of the drainage channel (433) is located inside the rectangular portion (431), and the outlet of the drainage channel (433) is located inside the tapered portion (432).

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