A purification device and method of monop-nitrobenzyl malonate

Abstract

The application discloses a kind of purification device and method of monoparais-nitrobenzyl malonate, it is related to monoparais-nitrobenzyl malonate production technical field, the purification device includes base, the top of base is equipped with storage cylinder, the rotating disc is equipped with sector slot one, the disc type frame is equipped with sector slot two;The inner end of material cylinder is fixed with box frame, the rotating sleeve outer side is provided with annular pusher, the filter basket inner side is provided with transmission part, and the box frame is rotatably installed with spray head.In the application, first, through the rotation of rotating disc and the vertical movement of baffle disc, dynamic filtration and impurity discharge are realized, the filtration efficiency and the reliability of impurity discharge are improved, second, through the coordinated movement of mechanical structure, the utilization efficiency of equipment is improved, the downtime caused by cleaning is reduced, for the purification process that needs long time continuous operation, this design can reduce the downtime caused by cleaning, improve the working efficiency of equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of production of mono-p-nitrobenzyl malonate, and in particular to a purification device and method of mono-p-nitrobenzyl malonate. Background Art

[0002] Mono-p-nitrobenzyl malonate is an excellent solvent in the paint, textile and dye industries. It is often used as a solvent for shellac, alkyd resin, nitrocellulose, cellulose acetate, dyes, oils and greases, and printing inks.

[0003] During the synthesis of mono-(p-nitrobenzyl malonate), byproducts such as bis-(p-nitrobenzyl malonate) are produced. Purification can effectively remove these impurities, achieving higher product purity standards. Filtration is a key step in the purification of mono-(p-nitrobenzyl malonate), separating these solid impurities from the target product, thereby improving product purity.

[0004] Existing technologies typically filter the solution while hot through a filter to remove insoluble impurities. During the filtration process, these impurities gradually accumulate on the filter surface, reducing the filter's fluidity. Over time, these impurity particles accumulate, significantly increasing the filter's resistance. This not only affects filtration speed but can also lead to premature filter failure, requiring frequent filter replacements. This increases operating costs and compromises the efficiency of the entire recrystallization process.

[0005] Based on the above-mentioned defects, a purification device and method for mono-p-nitrobenzyl malonate are provided. Summary of the Invention

[0006] The object of the present invention is to solve the above-mentioned problems and to provide a purification device and method for mono-p-nitrobenzyl malonate.

[0007] To achieve the above object, the present invention adopts the following technical solution: a purification device for mono-p-nitrobenzyl malonate, comprising a base, a barrel and a storage barrel connected to the barrel mounted on the top of the base, a feed pipe connected to the top of the barrel, a disc-shaped frame fixedly disposed inside the barrel, a rotating disk rotatably connected to the bottom of the disc-shaped frame, a first fan-shaped groove being formed in the rotating disk, and a second fan-shaped groove being formed in the disc-shaped frame;

[0008] A box frame is fixedly provided at the inner end of the barrel, a filter bucket and a driving member for controlling the rotation of the filter bucket are installed in the box frame, a sewage pipe is connected to the bottom of the filter bucket, and a baffle is vertically slidable in the filter bucket;

[0009] The disc-shaped frame is rotatably connected to a rotary sleeve that passes through the rotary disc downward. The outer side of the rotary sleeve is provided with an annular pushing member. The inner side of the filter bucket is provided with a transmission member. When the rotary sleeve rotates, the baffle moves vertically under the action of the transmission member. A nozzle is rotatably installed on the box frame, an air pump is installed on the outside of the disc-shaped frame, and a second driving member is installed on the barrel. The rotary sleeve and the nozzle rotate synchronously by controlling the second driving member.

[0010] Preferably, the driving member includes a gear disk rotatably connected to the inside of the box frame, a second motor for controlling the rotation of the gear disk is installed at the bottom of the box frame, and teeth are fixed on the side wall of the filter bucket, and the teeth are engaged with the gear disk.

[0011] Preferably, the annular pushing member includes a push rod, which is fixed to the side end of the rotary sleeve through a frame plate. An arc-shaped groove 1 is provided at the bottom of the rotary disk, and the push rod is slidably arranged in the arc-shaped groove 1.

[0012] Preferably, a slide rod is fixedly provided on the top of the rotating disk, and a second arc-shaped groove cooperating with the slide rod is provided on the bottom of the disk frame.

[0013] Preferably, the second driving member includes a screw, which is rotatably connected to the box frame, and the outer side of the screw is screwed and connected with a screw sleeve. A linkage component is provided on the outer side of the barrel, and a slide groove is opened in the box frame. The slide groove cooperates with the screw sleeve to slide through, and a compression component is provided in the box frame. When the screw sleeve moves horizontally, the nozzle is driven to rotate through the compression component.

[0014] Preferably, a stopper is fixed on the box frame, the compression assembly includes a bracket fixed on the nozzle, a support rod is fixed on the side end of the bracket, and a notch is opened in the screw sleeve, and the notch cooperates with the support rod to slide.

[0015] Preferably, a shell cover is fixedly provided on the top of the disc frame, and the linkage assembly includes a bevel gear ring and a bevel gear, the bevel gear ring and the bevel gear are rotatably connected in the shell cover, the bevel gear ring is fixed to the rotary sleeve, and an equipment box is fixedly provided at the outer end of the barrel, and a wheel belt transmission mechanism is installed in the equipment box, and the wheel belt transmission mechanism can drive the bevel gear and the screw to rotate synchronously, and a first motor is installed at the outer end of the equipment box.

[0016] Preferably, the transmission member includes a sliding sleeve, the sliding sleeve is fixed to the baffle, a protrusion is fixed on the inner wall of the rotating sleeve, and a sliding rail that slides in cooperation with the protrusion is opened on the side wall of the sliding sleeve.

[0017] Preferably, the slide rail is composed of an annular groove and a spiral groove, and a frame rod is fixed to the inner end of the shell cover, and the frame rod is slidably connected to the sliding sleeve through a spline.

[0018] A method for purifying mono-p-nitrobenzyl malonate, comprising the following steps:

[0019] S1. Add an appropriate amount of solvent to the crude mono-p-nitrobenzyl malonate and pass it into a purification device, heating until it is completely dissolved;

[0020] S2. Filter the solution while hot to remove insoluble impurities;

[0021] S3, slowly cooling the filtered hot solution to allow crystals to precipitate;

[0022] S4. Wash the crystals with a small amount of cold solvent to remove surface impurities and dry the crystals.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. In this application, dynamic filtration and impurity removal are achieved through the rotation of the rotating disk and the vertical movement of the baffle. This design avoids the problem of impurities clogging the filter screen in traditional filtration devices, improving filtration efficiency and the reliability of impurity removal.

[0025] 2. In this application, the coordinated movement of the mechanical structure allows the filter funnel to be cleaned without affecting the heating and dissolving process of the solution above the tray. This design improves the utilization efficiency of the equipment and reduces the downtime caused by cleaning. For purification processes that require long-term continuous operation, this design can reduce downtime caused by cleaning and improve equipment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the three-dimensional structure of a purification device provided in an embodiment of the present invention is shown;

[0027] Figure 2 A schematic cross-sectional view of a purification device provided in an embodiment of the present invention is shown;

[0028] Figure 3 A schematic cross-sectional view of a housing and a cartridge frame according to an embodiment of the present invention is shown;

[0029] Figure 4 It shows a local enlarged schematic diagram of point A provided according to an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of the matching structure of the rotary sleeve and the sliding sleeve according to an embodiment of the present invention is shown;

[0031] Figure 6 A schematic diagram of the exploded structure of a disc frame, a rotating disc and a filter bucket provided according to an embodiment of the present invention is shown.

[0032] Legend:

[0033] 1. Base; 2. Barrel; 3. Filter hopper; 4. Rotary disk; 401. Sector groove 1; 402. Arc groove 1; 403. Slide rod; 5. Disc frame; 501. Sector groove 2; 502. Arc groove 2; 6. Shell; 7. Bevel gear ring; 8. Rotary sleeve; 801. Protrusion; 9. Push rod; 10. Slide sleeve; 11. Slide rail; 12. Baffle plate; 13. Frame rod; 14. Bevel gear; 15. Equipment box; 16. Wheel belt transmission mechanism; 17. First motor; 18. Box frame; 19. Gear; 20. Toothed disc; 21. Second motor; 22. Screw; 23. Screw sleeve; 24. Notch; 25. Nozzle; 26. Bracket; 27. Support rod; 28. Air pump; 29. ​​Block; 30. Drain pipe; 31. Storage barrel. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] The present invention provides a technical solution: please refer to Figures 1-6 A purification device for mono-p-nitrobenzyl malonate includes a base 1, a barrel 2 and a storage barrel 31 connected to the barrel 2 are installed on the top of the base 1, a feed pipe is connected to the top of the barrel 2, a disc frame 5 is fixedly provided inside the barrel 2, a turntable 4 is rotatably connected to the bottom of the disc frame 5, a fan-shaped groove 1 401 is opened in the turntable 4, and a fan-shaped groove 2 501 is opened in the disc frame 5.

[0036] Barrel 2 is used to hold the nitrobenzyl ester solution to be purified. A feed pipe is connected to the top to facilitate material input. A storage barrel 31 is connected to barrel 2 and temporarily stores the purified nitrobenzyl ester for subsequent processing. The space within barrel 2, above the disc holder 5, is specifically used for heating and dissolving the crude product and solvent. An external heating device (such as an electric heating mantle or oil bath heater) heats the crude product and solvent until they are completely dissolved, forming a uniform solution. The flow and residence time of the solution can be adjusted by controlling the rotation of the rotary disk 4. When the first and second sector grooves 401 and 501 are aligned, the solution flows smoothly into the filter hopper 3. When the first and second sector grooves 401 and 501 are misaligned, the solution is temporarily contained in the space above the disc holder 5 for heating and dissolving.

[0037] Filter hopper 3 is connected to barrel 2 and is used for filtration and separation. When sector-shaped groove 1 401 is aligned with sector-shaped groove 2 501 , the solution flows into filter hopper 3 , where impurities are filtered out. The purified solution then flows into storage barrel 31 for temporary storage. Storage barrel 31 is used to temporarily store the purified mono-p-nitrobenzyl malonate solution for subsequent processing steps such as cooling and crystallization.

[0038] The rotation of the rotary disk 4 allows for flexible control of the solution flow and residence time. This allows the dissolution and filtration processes to be adjusted according to actual needs, improving purification efficiency. During the dissolution stage, the residence time of the solution above the disc holder 5 can be appropriately extended to ensure complete dissolution of the crude product. During the filtration stage, the solution can be quickly introduced into the filter hopper 3 to reduce residual impurities. The entire device has a compact structure, is easy to operate and maintain, and the flow of the solution is controlled by the rotation of the rotary disk 4, which is simple to operate and easy to implement automated control.

[0039] A box frame 18 is fixed to the inner end of the barrel 2, and a filter bucket 3 and a driving member for controlling the rotation of the filter bucket 3 are installed in the box frame 18. The bottom of the filter bucket 3 is connected to a sewage pipe 30, and the output end of the sewage pipe 30 extends outward from the barrel 2. A baffle 12 that can block the input end of the sewage pipe 30 slides vertically in the filter bucket 3.

[0040] After the solution flows into the filter hopper 3, impurities are filtered out, and the purified solution flows into the storage cylinder 31. During this process, the baffle 12 blocks the input end of the sewage pipe 30, ensuring that the input end of the sewage pipe 30 is completely closed. The purpose of this step is to prevent the purified solution from flowing out of the sewage pipe 30 and ensure that only impurities can be discharged. After the filter hopper 3 completes filtering of this portion of the solution, the rotary disk 4 is controlled to rotate so that the sector groove 1 401 and the sector groove 2 501 are staggered. During this process, the baffle 12 moves upward in the vertical direction under the action of the transmission member, opening the input end of the sewage pipe 30, and impurities are discharged through the sewage pipe 30 at the bottom of the filter hopper 3.

[0041] The solution achieves dynamic filtration and impurity discharge through the rotation of the rotary disk 4 and the vertical movement of the baffle 12. This design avoids the problem of impurities clogging the filter screen in traditional filtration devices, improving filtration efficiency and reliability of impurity discharge.

[0042] The disc-shaped frame 5 is rotatably connected to a rotary sleeve 8 that passes through the rotary disk 4 downward. The outer side of the rotary sleeve 8 is provided with an annular pushing member that drives the rotary disk 4 to rotate. A transmission member is provided on the inner side of the filter bucket 3. When the rotary sleeve 8 rotates, the baffle 12 moves vertically under the action of the transmission member. A nozzle 25 is rotatably mounted on the box frame 18, an air pump 28 is installed on the outside of the disc-shaped frame 5, and a driving member 2 for controlling the synchronous rotation of the rotary sleeve 8 and the nozzle 25 is installed on the barrel 2.

[0043] After the filter 3 has finished filtering the solution, the second driver controls the rotary sleeve 8 to rotate synchronously with the spray head 25. During this process, the baffle 12, driven by the transmission element, lifts upward away from the input end of the drain pipe 30, opening the drain pipe 30 and allowing impurities to be discharged. The rotary disc 4, driven by the annular pusher, rotates, causing the first sector groove 401 to stagger with the second sector groove 501. Simultaneously, the spray head 25 lifts upward and toward the filter 3. By activating the air pump 28 and the first driver, the spray head 25 blows air into the rotating filter 3, achieving air jet cleaning of the filter 3, further improving its cleanliness and reducing impurity residue. Furthermore, during the cleaning process, the first sector groove 401 and the second sector groove 501 are staggered, allowing the space above the disc frame 5 to heat and dissolve the solution continuing to flow into the barrel 2. This coordinated movement of the mechanical structure ensures that the heating and dissolving process of the solution above the disc frame 5 is not affected during the cleaning process of the filter 3. This design improves equipment utilization and reduces downtime due to cleaning. For purification processes that require long-term continuous operation, this design can reduce downtime due to cleaning and improve equipment efficiency.

[0044] Specifically, such as Figure 2 As shown, the driving member 1 includes a gear disc 20 rotatably connected to the inside of the box frame 18, a second motor 21 for controlling the rotation of the gear disc 20 is installed at the bottom of the box frame 18, and teeth 19 for engaging with the gear disc 20 are fixed on the side wall of the filter hopper 3.

[0045] When the filter hopper 3 needs to be cleaned, the second motor 21 is started to drive the gear disc 20 to rotate. The gear disc 20 engages with the teeth 19 on the side wall of the filter hopper 3 to drive the filter hopper 3 to rotate. During the rotation process, the nozzle 25 blows air or sprays liquid to clean the filter hopper 3 to improve the cleaning effect.

[0046] Specifically, such as Figure 3 and Figure 6 As shown, the annular pusher includes a push rod 9 fixed to the side end of the rotary sleeve 8 through a frame plate, and an arc groove 1 402 is provided at the bottom of the rotary disk 4 to cooperate with the sliding of the push rod 9; a slide rod 403 is fixed to the top of the rotary disk 4, and an arc groove 2 502 is provided at the bottom of the disc frame 5 to cooperate with the sliding of the slide rod 403.

[0047] When it is necessary to discharge the dissolved liquid above the disc frame 5 downward, as the rotary sleeve 8 rotates, the push rod 9 fixed to the side end of the rotary sleeve 8 first slides along the arc groove 1 402. During this process, the rotary disc 4 will remain stationary relative to the disc frame 5, and the sliding sleeve 10 will move downward under the action of the transmission member to block the input end of the sewage pipe 30. Subsequently, as the rotary disc 4 continues to rotate, the push rod 9 acts on the inner wall of the arc groove 1 402, driving the rotary disc 4 to rotate, so that the sector groove 1 401 is rotated and aligned with the sector groove 2 501.

[0048] When the turntable 4 rotates, the slide bar 403 fixed on the turntable 4 will rotate along the arc groove 2 502. The sliding cooperation between the slide bar 403 and the arc groove 2 502 limits the rotation range of the turntable 4, thereby ensuring that the fan-shaped groove 1 401 and the fan-shaped groove 2 501 maintain a stable staggered or aligned state.

[0049] The coordinated action of push rod 9 and slide rod 403 ensures precise rotation of disk 4, achieving stable alignment or misalignment between sector slot 1 401 and sector slot 2 501. This precise control is crucial for the smooth drainage and filtration of the liquid. During the initial stage, disk 4 remains stationary, with only the movement of sleeve 10 sealing drain pipe 30 to ensure a tight seal before liquid discharge. Subsequently, push rod 9 begins to rotate disk 4. This step-by-step operation reduces interference between different movements and improves operational reliability.

[0050] Specifically, such as Figures 1-6 As shown, the second driving member includes a screw rod 22 rotatably connected to the box frame 18, and a linkage assembly that drives the screw rod 22 to rotate synchronously with the rotary sleeve 8. The outer side of the screw rod 22 is screwed and connected with the screw sleeve 23. A sliding groove is provided in the box frame 18 for the screw sleeve 23 to slide through. A pressing assembly is provided in the box frame 18. When the screw sleeve 23 moves horizontally, the nozzle 25 is driven to rotate through the pressing assembly.

[0051] As the screw 22 and the rotary sleeve 8 rotate synchronously under the action of the linkage assembly, the screw sleeve 23, threadedly connected to the screw 22, slides along the chute. During this process, the spray head 25 rotates along the cartridge frame 18 under the action of the compression assembly. As the rotary sleeve 8 rotates, driving the rotary disk 4 via the annular pusher, the spray head 25 rotates and rises under the action of the compression assembly as the sector groove 1 401 and sector groove 2 501 become misaligned. When sector groove 1 401 and sector groove 2 501 align, the spray head 25 rotates so that its output end is blocked by the block 29, preventing the solution filtered by the filter 3 from flowing into the spray head 25.

[0052] A block 29 is fixed to the cartridge frame 18 to block the output end of the nozzle 25. The compression assembly includes a bracket 26 fixed to the nozzle 25. A support rod 27 is fixed to the side end of the bracket 26. A recess 24 is formed in the screw sleeve 23 to accommodate the sliding movement of the support rod 27. When the screw sleeve 23 moves horizontally, the inner wall of the recess 24 will compress the support rod 27, driving the nozzle 25 to rotate.

[0053] A shell cover 6 is fixed to the top of the disc frame 5. The linkage assembly includes a bevel gear ring 7 and a bevel gear 14 rotatably connected to the shell cover 6. The bevel gear ring 7 is coaxially fixed with the rotary sleeve 8. An equipment box 15 is fixed to the outer end of the barrel 2. A wheel belt transmission mechanism 16 that drives the bevel gear 14 and the screw 22 to rotate synchronously is installed in the equipment box 15. A first motor 17 that acts on the wheel belt transmission mechanism 16 is installed at the outer end of the equipment box 15.

[0054] The belt drive mechanism 16 consists of two sprockets and a chain with meshing sleeves mounted on the outside of the sprockets. One sprocket is coaxially fixed to the bevel gear 14, and the other is coaxially fixed to the screw 22. When the first motor 17 is started, the two sprockets will rotate synchronously under the action of the chain. When the bevel gear 14 rotates, it will drive the rotating sleeve 8 to rotate through the meshing bevel gear ring 7.

[0055] Specifically, such as Figure 5 and Figure 6 As shown, the transmission member includes a sliding sleeve 10 that is slidably embedded in the inner side of the rotary sleeve 8 and fixed to the baffle 12. The inner wall of the rotary sleeve 8 is fixed with a protrusion 801, and the side wall of the sliding sleeve 10 is provided with a slide rail 11 that slides with the protrusion 801.

[0056] As the sleeve 8 rotates, the protrusion 801 fixed to the inner wall of the sleeve 8 slides along the slide rail 11. As the push rod 9 fixed to the side wall of the sleeve 8 slides along the arc-shaped groove 1 402, the protrusion 801 slides along the spiral groove of the slide rail 11. The pressure exerted by the side wall of the protrusion 801 on the inner wall of the spiral groove drives the sleeve 10 downward along the support rod 13. During this process, the first sector groove 401 and the second sector groove 501 remain offset. Until the baffle 12 fixed to the sleeve 10 blocks the input end of the sewage pipe 30, as the sleeve 8 continues to rotate, the push rod 9 acts on the inner wall of the arc-shaped groove 1 402, pushing the rotary disc 4 to rotate, aligning the first sector groove 401 with the second sector groove 501. During this process, the protrusion 801 slides along the annular groove of the slide rail 11, and the baffle 12 maintains its blockage of the input end of the sewage pipe 30.

[0057] The slide rail 11 is composed of an annular groove and a spiral groove. A support rod 13 is fixed to the inner top of the housing 6 and is slidably connected to the sleeve 10 via a spline. The spline arrangement of the support rod 13 restricts the relative sliding of the sleeve 10, thereby facilitating the compression transmission of the spiral groove of the slide rail 11 by the protrusion 801 fixed to the inner wall of the rotary sleeve 8.

[0058] Specifically, a method for purifying mono-p-nitrobenzyl malonate comprises the following steps:

[0059] S1. Add an appropriate amount of solvent to the crude mono-p-nitrobenzyl malonate and pass it into a purification device, heating until it is completely dissolved;

[0060] S2. Filter the solution while hot to remove insoluble impurities;

[0061] S3, slowly cooling the filtered hot solution to allow crystals to precipitate;

[0062] S4. Wash the crystals with a small amount of cold solvent to remove surface impurities and dry the crystals.

[0063] When selecting a solvent, ensure that it can completely dissolve the target substance at high temperatures, while its solubility decreases significantly at low temperatures. Common solvents include ethyl acetate, ethanol, and petroleum ether. Suitable solvents can be screened experimentally, for example by adding a small amount of sample to the solvent, heating and dissolving it, and then observing for crystal precipitation after cooling.

[0064] Add the crude mono-p-nitrobenzyl malonate to an appropriate amount of solvent and heat until it is completely dissolved. If there is still undissolved solid, continue to add solvent until it is completely dissolved.

[0065] Filter the hot solution to remove insoluble impurities. Use a preheated funnel and filter paper to prevent crystallization during the filtration process. Slowly cool the hot filtered solution to allow crystals to precipitate. Avoid cooling too quickly to prevent impurities from being trapped in the crystals.

[0066] The above description of the embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A purification device for mono-p-nitrobenzyl malonate, comprising a base, characterized in that: A barrel and a storage barrel connected to the barrel are installed on the top of the base. A material delivery pipe is connected to the top of the barrel. A disc-shaped frame is fixed inside the barrel. A rotary disc is rotatably connected to the bottom of the disc-shaped frame. A fan-shaped groove 1 is opened in the rotary disc, and a fan-shaped groove 2 is opened in the disc-shaped frame. A box frame is fixedly provided at the inner end of the barrel, a filter bucket and a driving member for controlling the rotation of the filter bucket are installed in the box frame, a sewage pipe is connected to the bottom of the filter bucket, and a baffle is vertically slidable in the filter bucket; The disc-shaped frame is rotatably connected to a rotary sleeve that passes through the rotary disc downward. The outer side of the rotary sleeve is provided with an annular pushing member. The inner side of the filter bucket is provided with a transmission member. When the rotary sleeve rotates, the baffle moves vertically under the action of the transmission member. A nozzle is rotatably installed on the box frame. An air pump is installed on the outside of the disc-shaped frame. A second driving member is installed on the barrel, and the rotary sleeve and the nozzle rotate synchronously through the second driving member. A stopper is fixed on the cartridge frame. When the first sector groove is aligned with the second sector groove, the nozzle rotates so that its output end is blocked by the stopper. The second driving member includes a screw, which is rotatably connected to the box frame, and the outer side of the screw is screwed and connected to a screw sleeve. A linkage component is provided on the outer side of the barrel, and a slide groove is provided in the box frame. The slide groove cooperates with the screw sleeve to slide through. A compression component is provided in the box frame. When the screw sleeve moves horizontally, the compression component drives the nozzle to rotate; A shell cover is fixedly provided on the top of the disc frame, and the linkage assembly includes a bevel gear ring and a bevel gear, the bevel gear ring and the bevel gear are rotatably connected in the shell cover, the bevel gear ring is fixed to the rotary sleeve, and an equipment box is fixedly provided on the outer end of the barrel, and a wheel belt transmission mechanism is installed in the equipment box, and the wheel belt transmission mechanism can drive the bevel gear and the screw to rotate synchronously, and a first motor is installed on the outer end of the equipment box.

2. A purification device for mono-p-nitrobenzyl malonate according to claim 1, characterized in that, The driving member includes a gear disk rotatably connected to the inside of the box frame, and a second motor for controlling the rotation of the gear disk is installed at the bottom of the box frame. The side wall of the filter bucket is fixed with teeth, which are engaged with the gear disk.

3. A purification device for mono-p-nitrobenzyl malonate according to claim 1, characterized in that, The annular pushing member includes a push rod, which is fixed to the side end of the rotary sleeve through a frame plate. An arc groove 1 is opened at the bottom of the rotary disk, and the push rod is slidably arranged in the arc groove 1.

4. A purification device for mono-p-nitrobenzyl malonate according to claim 3, characterized in that, A slide rod is fixedly arranged on the top of the rotating disk, and an arc groove 2 for cooperating with the slide rod to slide is opened on the bottom of the disk frame.

5. A purification device for mono-p-nitrobenzyl malonate according to claim 1, characterized in that, The compression assembly comprises a bracket fixed on the nozzle, a support rod is fixed on the side end of the bracket, a notch is provided in the screw sleeve, and the notch is adapted to slide with the support rod.

6. A purification device for mono-p-nitrobenzyl malonate according to claim 1, characterized in that: The transmission member includes a sliding sleeve, which is fixed to the baffle. A protrusion is fixed on the inner wall of the rotating sleeve, and a sliding rail is provided on the side wall of the sliding sleeve to slide in cooperation with the protrusion.

7. A purification device for mono-p-nitrobenzyl malonate according to claim 6, characterized in that: The slide rail is composed of an annular groove and a spiral groove. A frame rod is fixedly provided at the inner end of the shell cover. The frame rod is slidably connected to the sliding sleeve through a spline.

8. A purification method using the purification device of mono-p-nitrobenzyl malonate according to claim 1, characterized in that: The purification method comprises the following steps: S1. Add an appropriate amount of solvent to the crude mono-p-nitrobenzyl malonate and pass it into a purification device, heating until it is completely dissolved; S2. Filter the solution while hot to remove insoluble impurities; S3, slowly cooling the filtered hot solution to allow crystals to precipitate; S4. Wash the crystals with a small amount of cold solvent to remove surface impurities, and then dry the crystals.

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