A purification method and apparatus for the production of photoinitiators

Abstract

This invention relates to the field of photoinitiator preparation, specifically to a purification apparatus for photoinitiator production. The apparatus includes a base, and further comprises a hot-melting mechanism, a pumping mechanism, and a cooling separation mechanism mounted on the base. The hot-melting mechanism rapidly and efficiently dissolves the crude photoinitiator, and simultaneously drives the pumping mechanism to deliver coolant to the cooling separation mechanism for cooling and recrystallizing the solvent containing the dissolved crude photoinitiator, significantly improving purification efficiency. The pumping mechanism also delivers the solvent to the cooling separation mechanism for further cooling and recrystallization. While delivering the solvent, the pumping mechanism utilizes the liquid kinetic energy of the solvent to drive the cooling separation mechanism to separate the recrystallized solid-liquid mixture, discharging the liquids separately. The operation is simple and convenient. This purification method and apparatus for photoinitiator production facilitates continuous purification operations and significantly improves work efficiency.

Description

Technical Field

[0001] This invention relates to the field of photoinitiator preparation, specifically to a purification method and apparatus for photoinitiator production. Background Technology

[0002] Photoinitiators are compounds that can absorb energy of a certain wavelength in the ultraviolet (250-420nm) or visible (400-800nm) region, generate free radicals, cations, etc., and thus initiate monomer polymerization, cross-linking and curing. In order to improve the purity of photoinitiators, a recrystallization step is required to purify the photoinitiators in the manufacturing process.

[0003] Existing purification equipment has a complex structure and cannot perform continuous purification of photoinitiators, resulting in low production efficiency. Therefore, we propose a purification method and apparatus for photoinitiator production. Summary of the Invention

[0004] The purpose of this invention is to provide a purification method and apparatus for the production of photoinitiators, thereby solving the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a purification apparatus for the production of photoinitiators, comprising a base, and further comprising:

[0005] The hot-melting mechanism, the liquid pumping mechanism, and the cooling separation mechanism are mounted on the base;

[0006] The hot dissolving mechanism is used to rapidly dissolve the crude photoinitiator. Simultaneously, the hot dissolving mechanism drives the pumping mechanism to deliver coolant to the cooling separation mechanism for cooling and recrystallizing the solvent containing the crude photoinitiator. The pumping mechanism also delivers the solvent to the cooling separation mechanism for cooling and recrystallization. Furthermore, while delivering the solvent, the pumping mechanism uses the liquid kinetic energy of the solvent to drive the cooling separation mechanism to separate the recrystallized solid-liquid mixture.

[0007] Preferably, the hot melting mechanism includes a hot melting box with a heating function, and the hot melting box is fixed on the base. A sieve cylinder is fixed inside the hot melting box, and a tube shaft is rotatably connected to the bottom of the sieve cylinder. The upper end of the tube shaft passes through and is rotatably connected to the top wall of the hot melting box. The tube shaft is driven by a motor fixed to the top wall. A stirring rod is fixed on the outer peripheral wall inside the sieve cylinder.

[0008] Preferably, the tube shaft has a through hole on the outer peripheral wall inside the screen cylinder. The lower end of the tube shaft penetrates the bottom of the screen cylinder and has a groove at the lower end. The groove is separated from the inside of the tube shaft. A cap is fitted onto the upper end of the tube shaft and is rotatably connected to it. The cap is fixed on the top wall and is connected to liquid pipe five. Liquid pipe five is connected to an electric control valve one and is connected to a solvent tank. A feed pipe communicating with the inside of the screen cylinder is fixed on the top wall and an electric control valve two is connected to the feed pipe.

[0009] Preferably, the pump mechanism includes a pump cylinder fixed on a base, a piston plate slidably connected inside the pump cylinder, a reciprocating screw rotatably connected to the bottom of the hot melt tank, the upper end of the reciprocating screw penetrating the bottom of the hot melt tank, a multi-faceted rod coaxially fixedly connected to the upper end of the reciprocating screw, the multi-faceted rod being inserted into the groove, a matching sliding sleeve being sleeved and slidably connected on the reciprocating screw, the sliding sleeve being fixedly connected to the piston plate through a pull rod, and the pull rod penetrating and slidably connected to the top plate of the pump cylinder.

[0010] Preferably, a slide cylinder is fixed and connected to the lower end of the side wall of the pump cylinder, and the slide cylinder is connected to the space below the piston plate inside the pump cylinder. A sliding plate is slidably connected inside the slide cylinder, and a spring is fixed on the side of the sliding plate away from the space. A push-button switch is fixed at the end of the slide cylinder away from the pump cylinder. The spring can engage with the push-button switch. The push-button switch is electrically connected to electric control valve one and electric control valve two. A limit block is fixed on the inner wall of the end of the slide cylinder near the pump cylinder.

[0011] Preferably, a one-way valve 1 and a one-way valve 2 are fixed on the top plate of the pump barrel. Both one-way valve 1 and one-way valve 2 are connected to the space inside the pump barrel located on the upper side of the piston plate. One-way valve 1 is connected to the coolant tank through liquid pipe 1, and one-way valve 2 is connected to liquid pipe 2. The conduction direction of one-way valve 1 points to the inside of the pump barrel, and the conduction direction of one-way valve 2 points to liquid pipe 2.

[0012] Preferably, liquid pipe three and liquid pipe four are fixed to the lower end of the side wall of the pump barrel. Liquid pipe three and liquid pipe four are both connected to the space under the piston plate inside the pump barrel. Liquid pipe three is fixed to and connected to the bottom of the hot melt box. One-way valve three and one-way valve four are respectively connected to liquid pipe three and liquid pipe four. The conduction direction of one-way valve three is pointing to the inside of the pump barrel, and the conduction direction of one-way valve four is pointing to liquid pipe four.

[0013] Preferably, the cooling separation mechanism includes a cooling separation cylinder fixed on the base, a nozzle fixed on the upper top wall of the cooling separation cylinder, and a liquid pipe connected to the nozzle. A pump wheel is fixed in the middle of the outer side wall of the cooling separation cylinder, and the liquid pipe is fixed and connected to the peripheral wall of the pump wheel.

[0014] Preferably, multiple converging cones are fixed at equal intervals from top to bottom on the upper part of the inner wall of the cooling separation cylinder. Both ends of the converging cones are open. The lower part of the converging cones is fixedly connected to the dispersing cones through a branch pipe, and the lower end of the dispersing cones is also open. Both the converging cones and the dispersing cones have cavities inside. The upper and lower ends of the branch pipes are respectively connected to the cavities inside the corresponding converging cones and dispersing cones. The cavity inside the dispersing cone near the middle of the cooling separation cylinder is connected to the liquid pipe II. The cavity inside the converging cone near the top wall of the cooling separation cylinder is connected to the liquid pipe VI.

[0015] Preferably, a filter screen is fixed to the lower part of the inner wall of the cooling separation cylinder, the lower end of the filter screen is fixed and connected to the discharge cylinder, the discharge cylinder passes through and is fixedly connected to the bottom plate of the cooling separation cylinder, the section of the discharge cylinder located on the lower side of the bottom plate is connected to discharge valve one and discharge valve two, and the lower end of the side wall of the cooling separation cylinder is fixed and connected to the drain pipe.

[0016] Preferably, a bushing is fixed in the middle of the inner wall of the cooling separation cylinder, and a rotating shaft is inserted into the bushing and rotated around the fixed axis. The upper end of the rotating shaft is connected to the impeller shaft of the pump wheel through a bevel gear set, and a scraper is fixed at the lower end of the rotating shaft. The scraper is used to clean the inner wall of the filter cylinder.

[0017] A purification method for the production of photoinitiators includes the following steps:

[0018] Step 1: The crude photoinitiator is efficiently dissolved using a hot-melt mechanism;

[0019] Step 2: Driven by the hot-melt mechanism, the pump mechanism delivers the coolant and the solution obtained in Step 1 to the cooling separation mechanism respectively;

[0020] Step 3: The hot-melt mechanism is intermittently and automatically fed through a pump mechanism;

[0021] Step 4: The solution obtained in Step 1 is subjected to efficient cooling and recrystallization using a cooling separation mechanism;

[0022] Step 5: The solid-liquid mixture obtained in Step 4 is separated by a cooling separation mechanism and discharged separately.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In this invention, the photoinitiator crude product is efficiently dissolved by the hot-melting mechanism. At the same time, driven by the hot-melting mechanism, the pumping mechanism delivers the coolant and the solution containing the photoinitiator crude product to the cooling separation mechanism. Furthermore, the pumping mechanism enables intermittent automatic feeding of the hot-melting mechanism, which helps to achieve continuous purification operations and greatly improves work efficiency.

[0025] In this invention, a cooling separation mechanism is used to efficiently cool and recrystallize the solution containing crude photoinitiator, thereby greatly improving the cooling efficiency and effect of the solution and the purification efficiency. Furthermore, the cooling separation mechanism is used to separate the solid-liquid mixture and discharge them separately, making the operation simple and convenient. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall assembly cross-section of the present invention;

[0027] Figure 2 for Figure 1 Enlarged structural diagram at point A in the diagram;

[0028] Figure 3 for Figure 1 Enlarged structural diagram at point B in the diagram;

[0029] Figure 4 This is a schematic diagram of the cross-sectional structure of the converging cone and the dispersing cone in this invention.

[0030] In the diagram: 1. Base; 2. Hot melt box; 3. Screen cylinder; 4. Pipe shaft; 5. Stirring rod; 6. Motor; 7. Cap; 8. Electrically controlled valve one; 9. Liquid pipe five; 10. Feed pipe; 11. Electrically controlled valve two; 12. Pump cylinder; 13. One-way valve one; 14. Liquid pipe one; 15. Sliding sleeve; 16. One-way valve three; 17. Pull rod; 18. One-way valve two; 19. Piston plate; 20. Liquid pipe three; 21. One-way valve four; 22. Liquid pipe four; 23. Nozzle; 24. Cooling separation cylinder; 25. 26. Converging cone; 27. Dispersing cone; 28. Liquid pipe six; 29. ​​Liquid pipe two; 30. Pump wheel; 31. Bevel gear set; 32. Bushing; 33. Rotating shaft; 34. Scraper; 35. Filter screen cylinder; 36. Discharge cylinder; 37. Discharge valve one; 38. Discharge valve two; 39. Drain pipe; 40. Reciprocating screw; 41. Multi-faceted rod; 42. Groove; 43. Through hole; 44. Slide cylinder; 45. Push button switch; 46. Spring; 47. Slide plate; 48. Branch pipe; 49. Limit block. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1 to 4 The present invention provides a technical solution: a purification device for the production of photoinitiators, comprising a base 1, and further comprising:

[0033] A hot-melting mechanism, a pumping mechanism, and a cooling separation mechanism are mounted on the base 1;

[0034] The hot dissolving mechanism is used to rapidly dissolve the crude photoinitiator. Simultaneously, the hot dissolving mechanism drives the pumping mechanism to deliver coolant to the cooling separation mechanism for cooling and recrystallizing the solvent containing the crude photoinitiator. The pumping mechanism also delivers the solvent to the cooling separation mechanism for cooling and recrystallization. Furthermore, while delivering the solvent, the pumping mechanism uses the liquid kinetic energy of the solvent to drive the cooling separation mechanism to separate the recrystallized solid-liquid mixture.

[0035] In this embodiment, the hot melting mechanism includes a hot melting box 2 with a heating function, and the hot melting box 2 is fixed on the base 1. A sieve cylinder 3 is fixed inside the hot melting box 2, and a tube shaft 4 is rotatably connected to the bottom of the sieve cylinder 3. The upper end of the tube shaft 4 passes through and is rotatably connected to the top wall of the hot melting box 2. The tube shaft 4 is connected to a motor 6 fixed on the top wall. A stirring rod 5 is fixed on the outer peripheral wall inside the sieve cylinder 3.

[0036] In this embodiment, the tube shaft 4 is provided with a through hole 42 on the outer peripheral wall inside the sieve cylinder 3. The lower end of the tube shaft 4 penetrates the bottom of the sieve cylinder 3 and has a groove 41 at the lower end. The groove 41 is separated from the interior of the tube shaft 4. The upper end of the tube shaft 4 is fitted with a cap 7 and is fixedly rotatably connected to it. The cap 7 is fixed on the top wall. The cap 7 is connected to the liquid pipe 9, and the liquid pipe 9 is connected to an electric control valve 8. The liquid pipe 9 is connected to the solvent tank. The solvent tank is not shown in this application. The feed pipe 10, which communicates with the interior of the sieve cylinder 3, is fixed on the top wall, and the feed pipe 10 is connected to an electric control valve 11.

[0037] In this embodiment, the pumping mechanism includes a pump cylinder 12 fixed on the base 1, a piston plate 19 slidably connected inside the pump cylinder 12, a reciprocating screw 39 rotatably connected to the bottom of the hot melt box 2, and the upper end of the reciprocating screw 39 penetrates the bottom of the hot melt box 2. A polygonal rod 40 is coaxially fixedly connected to the upper end of the reciprocating screw 39. The polygonal rod 40 is inserted into the groove 41. A matching sliding sleeve 15 is sleeved and slidably connected on the reciprocating screw 39. The sliding sleeve 15 is fixedly connected to the piston plate 19 through a pull rod 17. The pull rod 17 penetrates and slidably connects to the top plate of the pump cylinder 12.

[0038] In this embodiment, a slide cylinder 43 is fixed and connected to the lower end of the side wall of the pump cylinder 12, and the slide cylinder 43 is connected to the space below the piston plate 19 inside the pump cylinder 12. A slide plate 46 is slidably connected inside the slide cylinder 43, and a spring 45 is fixed on the side of the slide plate 46 away from the space. A push-button switch 44 is fixed at the end of the slide cylinder 43 away from the pump cylinder 12. The spring 45 can engage with the push-button switch 44. The push-button switch 44 is electrically connected to the first electric control valve 8 and the second electric control valve 11. A limit block 48 is fixed on the inner wall of the end of the slide cylinder 43 near the pump cylinder 12.

[0039] In this embodiment, a first check valve 13 and a second check valve 18 are fixed on the top plate of the pump cylinder 12. Both the first check valve 13 and the second check valve 18 are connected to the space inside the pump cylinder 12 located above the piston plate 19. The first check valve 13 is connected to the coolant tank through a liquid pipe 14 (not shown in this application). The second check valve 18 is connected to a second liquid pipe 28. The conduction direction of the first check valve 13 points towards the inside of the pump cylinder 12, and the conduction direction of the second check valve 18 points towards the liquid pipe. 28. Liquid pipe 3 20 and liquid pipe 4 22 are fixed to the lower end of the side wall of pump barrel 12. Liquid pipe 3 20 and liquid pipe 4 22 are both connected to the space under the piston plate 19 inside pump barrel 12. Liquid pipe 3 20 is fixed to and connected to the bottom of hot melt box 2. One-way valve 3 16 and one-way valve 4 21 are respectively connected to liquid pipe 3 20 and liquid pipe 4 22. The conduction direction of one-way valve 3 16 is towards the inside of pump barrel 12, and the conduction direction of one-way valve 4 21 is towards liquid pipe 4 22.

[0040] In this embodiment, the cooling separation mechanism includes a cooling separation cylinder 24 fixed on a base 1. A nozzle 23 is fixed on the upper top wall of the cooling separation cylinder 24, and a liquid pipe 22 is connected to the nozzle 23. A pump wheel 29 is fixed in the middle of the outer side wall of the cooling separation cylinder 24, and the liquid pipe 22 is fixed and connected to the peripheral wall of the pump wheel 29. Multiple converging cones 25 are fixed at equal intervals from top to bottom on the upper part of the inner wall of the cooling separation cylinder 24. Both ends of the converging cones 25 are open. A dispersing cone 26 is fixedly connected to the lower part of the converging cones 25 through a branch pipe 47, and the lower end of the dispersing cone 26 is open. Both the converging cones 25 and the dispersing cones 26 have cavities inside. The upper and lower ends of the branch pipe 47 are respectively connected to the cavities inside the corresponding converging cones 25 and dispersing cones 26. The cavities inside the dispersing cones 26 near the middle of the cooling separation cylinder 24 are... The cavity is connected to the liquid pipe 28. The cavity inside the converging cone 25 near the top wall of the cooling separation cylinder 24 is connected to the liquid pipe 27. A filter screen cylinder 34 is fixed to the lower part of the inner wall of the cooling separation cylinder 24. The lower end of the filter screen cylinder 34 is fixed and connected to the discharge cylinder 35. The discharge cylinder 35 passes through and is fixedly connected to the bottom plate of the cooling separation cylinder 24. The section of the discharge cylinder 35 located on the lower side of the bottom plate is connected to the discharge valve 36 and the discharge valve 37. The lower end of the side wall of the cooling separation cylinder 24 is fixed and connected to the drain pipe 38. A bushing 31 is fixed to the middle of the inner wall of the cooling separation cylinder 24. A rotating shaft 32 is inserted into the bushing 31 and rotated around the fixed axis. The upper end of the rotating shaft 32 is connected to the impeller shaft of the pump wheel 29 through the bevel gear set 30. A scraper 33 is fixed to the lower end of the rotating shaft 32, and the scraper 33 is used to clean the inner wall of the filter screen cylinder 34.

[0041] The method of use and advantages of this invention: The purification device for photoinitiator production operates as follows:

[0042] Step 1: As Figure 1 As shown, when the motor 6 is started, the motor 6 drives the tube shaft 4 to rotate, which in turn drives the stirring rod 5 to stir the crude photoinitiator and solvent in the sieve cylinder 3. This allows the crude photoinitiator to dissolve quickly and efficiently in the heated hot melt box 2, improving the dissolution efficiency and effect. It should be noted that the amount of crude photoinitiator in the sieve cylinder 3 is always greater than the amount of solvent dissolved, so as to ensure that the solvent is saturated, which helps to improve the cooling recrystallization effect.

[0043] Step Two: As Figure 1 and Figure 2As shown, the rotation of the tube shaft 4 drives the reciprocating screw 39 to rotate via the polygonal rod 40. This causes the reciprocating screw 39 to move the piston plate 19 up and down within the pump cylinder 12 via the sliding sleeve 15 and the pull rod 17. When the piston plate 19 moves upward, it applies a compressive force to the space above it, causing the coolant to be transported through the liquid pipe 28 to the inner cavity of the lowest dispersion cone 26. At the same time, the upward movement of the piston plate 19 also applies a suction force to the space below it, causing the solution containing the photoinitiator dissolved in the hot melt tank 2 to enter the pump cylinder 12 through the liquid pipe 3 20. When the piston plate 19 moves downward, it applies a suction force to the space above it, causing the coolant to be transported from the coolant tank to the pump cylinder 12 through the liquid pipe 14. At the same time, the upward movement of the piston plate 19 also applies a compressive force to the space below it, causing the solution containing the photoinitiator dissolved in the pump cylinder 12 to be transported through the liquid pipe 4 22 to the nozzle 23, and then sprayed from the nozzle 23 into the cooling separation cylinder 24.

[0044] Step 3: As described in Step 2, such as Figure 1 and Figure 3 As shown, when the piston plate 19 moves downward, the pressure in its lower space increases, causing the slide plate 46 to drive the spring 45 to engage with the button switch 44, energizing the button switch 44. This energizes and opens the first and second solenoid valves 11, allowing the solvent to enter the tube shaft 4 through the liquid pipe 9 and then through the various through holes 42 into the sieve cylinder 3. Simultaneously, the crude photoinitiator enters the sieve cylinder 3 through the feed pipe 10. When the piston plate 19 moves upward, the pressure in its lower space decreases, causing the slide plate 46 to drive the spring 45 away from the button switch 44. At this point, the button switch 44 is de-energized, energizing and closing the first and second solenoid valves 11. This closes the liquid pipe 9 and the feed pipe 10, stopping the feeding process and achieving intermittent automatic feeding. This facilitates continuous purification operations and greatly improves work efficiency.

[0045] Step Four: As Figure 1 and Figure 4 As shown, the coolant flows upward through the cavity in the lowest dispersion cone 26 via the corresponding branch pipe 47, and then flows through each converging cone 25 and dispersion cone 26 in sequence, finally exiting through the liquid pipe 27. This ensures that each converging cone 25 and dispersion cone 26 has a cooling effect and increases the cooling area. The solution sprayed from the nozzle 23 passes through the upper surfaces of each converging cone 25 and dispersion cone 26 from top to bottom, thereby greatly improving the cooling efficiency and effect of the solution. This allows the photoinitiator in the solution to recrystallize efficiently, greatly improving the purification efficiency.

[0046] Step 5: The recrystallized photoinitiator and solution flow downwards into the filter cylinder 34, leaving the solid photoinitiator inside the filter cylinder 34. At the same time, the solvent is discharged through the drain pipe 38, and the solid photoinitiator accumulates in the discharge cylinder 35. When a large amount accumulates, firstly, discharge valve 1 36 is opened, allowing the photoinitiator to enter between discharge valve 1 36 and discharge valve 2 37. Then, discharge valve 1 36 is closed, and then discharge valve 2 37 is opened. This allows the recrystallized photoinitiator to be removed without stopping the purification process, making the operation convenient.

[0047] like Figure 1 As shown, while the solution in the liquid pipe 22 flows, it drives the rotating shaft 32 to rotate through the impeller shaft and bevel gear set 30 in the pump wheel 29. This causes the rotating shaft 32 to drive the scraper 33 to clean the inner wall of the filter cylinder 34, so that the solid photoinitiator accumulates in the discharge cylinder 35 and avoids clogging of the filter cylinder 34. This improves the solid-liquid separation efficiency of the photoinitiator and the solution. In addition, the whole device has a compact structure and occupies less space.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A purification device for the production of photoinitiators, comprising a base (1), characterized in that: Also includes: A hot-melting mechanism, a pumping mechanism, and a cooling separation mechanism are mounted on the base (1); The hot dissolving mechanism is used to rapidly dissolve the crude photoinitiator. Simultaneously, the hot dissolving mechanism drives the pump mechanism to deliver coolant to the cooling separation mechanism to cool and recrystallize the solvent containing the crude photoinitiator. The pump mechanism also delivers the solvent to the cooling separation mechanism for cooling and recrystallization. Furthermore, while delivering the solvent, the pump mechanism uses the liquid kinetic energy of the solvent to drive the cooling separation mechanism to separate the recrystallized solid-liquid mixture. The hot melting mechanism includes a hot melting box (2) with heating function, and the hot melting box (2) is fixed on the base (1). A sieve cylinder (3) is fixed inside the hot melting box (2), and a tube shaft (4) is rotatably connected to the bottom of the sieve cylinder (3). The upper end of the tube shaft (4) passes through and is rotatably connected to the top wall of the hot melting box (2). The tube shaft (4) is connected to a motor (6) fixed on the top wall. A stirring rod (5) is fixed on the outer peripheral wall inside the sieve cylinder (3). A through hole (42) is opened on the outer peripheral wall inside the sieve cylinder (3). The lower end of the tube shaft (4) penetrates the bottom of the sieve cylinder (3) and has a groove (41) at the lower end. The groove (41) is separated from the interior of the tube shaft (4). The upper end of the tube shaft (4) is fitted with a cap (7) and is fixedly rotatably connected to it. The cap (7) is fixed on the top wall. The cap (7) is connected to the liquid pipe five (9), and the liquid pipe five (9) is connected to an electric control valve one (8). The liquid pipe five (9) is connected to the solvent tank. The top wall is fixed with a feed pipe (10) that communicates with the interior of the sieve cylinder (3), and the feed pipe (10) is connected to an electric control valve two (11). The pumping mechanism includes a pump cylinder (12) fixed on a base (1), a piston plate (19) slidably connected inside the pump cylinder (12), a reciprocating screw (39) rotatably connected to the bottom of the hot melt box (2), and the upper end of the reciprocating screw (39) penetrates the bottom of the hot melt box (2). A multi-faceted rod (40) is coaxially fixedly connected to the upper end of the reciprocating screw (39), and the multi-faceted rod (40) is inserted into the groove (41). A matching sliding sleeve (15) is sleeved and slidably connected on the reciprocating screw (39), and the sliding sleeve (15) is fixedly connected to the piston plate (19) through a pull rod (17). The pull rod (17) penetrates and slidably connects to the pump cylinder (12). On the top plate of 2), the lower end of the side wall of the pump cylinder (12) is fixed and connected to a slide cylinder (43), and the slide cylinder (43) is connected to the space below the piston plate (19) inside the pump cylinder (12). The slide cylinder (43) is slidably connected to a slide plate (46), and a spring (45) is fixed on the side of the slide plate (46) away from the space. A button switch (44) is fixed at the end of the slide cylinder (43) away from the pump cylinder (12). The spring (45) can be in contact with the button switch (44). The button switch (44) is electrically connected to the first electric control valve (8) and the second electric control valve (11). A limit block (48) is fixed on the inner wall of the end of the slide cylinder (43) close to the pump cylinder (12). One-way valve 1 (13) and one-way valve 2 (18) are fixed on the top plate of the pump cylinder (12). One-way valve 1 (13) and one-way valve 2 (18) are both connected to the space inside the pump cylinder (12) located on the upper side of the piston plate (19). One-way valve 1 (13) is connected to the coolant tank through liquid pipe 1 (14). One-way valve 2 (18) is connected to liquid pipe 2 (28). The conduction direction of one-way valve 1 (13) points to the inside of the pump cylinder (12), and the conduction direction of one-way valve 2 (18) points to liquid pipe 2 (28). Liquid pipe three (20) and liquid pipe four (22) are fixed at the lower end of the side wall of the pump barrel (12). Liquid pipe three (20) and liquid pipe four (22) are connected to the space below the piston plate (19) inside the pump barrel (12). Liquid pipe three (20) is fixed and connected to the bottom of the hot melt box (2). One-way valve three (16) and one-way valve four (21) are respectively connected to liquid pipe three (20) and liquid pipe four (22). The conduction direction of one-way valve three (16) is pointing to the inside of the pump barrel (12), and the conduction direction of one-way valve four (21) is pointing to liquid pipe four (22). The cooling separation mechanism includes a cooling separation cylinder (24) fixed on a base (1), a nozzle (23) fixed on the upper top wall of the cooling separation cylinder (24), and a liquid pipe (22) connected to the nozzle (23). A pump wheel (29) is fixed in the middle of the outer side wall of the cooling separation cylinder (24), and the liquid pipe (22) is fixed and connected to the peripheral wall of the pump wheel (29). A filter screen cylinder (34) is fixed to the lower part of the inner wall of the cooling separation cylinder (24). The lower end of the filter screen cylinder (34) is fixed and connected to the discharge cylinder (35). The discharge cylinder (35) passes through and is fixedly connected to the bottom plate of the cooling separation cylinder (24). The section of the discharge cylinder (35) located on the lower side of the bottom plate is connected to the discharge valve one (36) and the discharge valve two (37). The lower end of the side wall of the cooling separation cylinder (24) is fixed and connected to the drain pipe (38). A bushing (31) is fixed in the middle of the inner wall of the cooling separation cylinder (24). A rotating shaft (32) is inserted into the bushing (31) and rotates on a fixed axis. The upper end of the rotating shaft (32) is connected to the impeller shaft of the pump wheel (29) through a bevel gear set (30). A scraper (33) is fixed at the lower end of the rotating shaft (32), and the scraper (33) is used to clean the inner wall of the filter cylinder (34).

2. A purification apparatus for the production of photoinitiators according to claim 1, characterized in that The upper part of the inner wall of the cooling separation cylinder (24) is fixed with multiple converging cones (25) at equal intervals from top to bottom. Both ends of the converging cones (25) are open. The lower part of the converging cones (25) is fixedly connected to the dispersing cones (26) through the branch pipe (47). The lower end of the dispersing cones (26) is open. Both the converging cones (25) and the dispersing cones (26) have cavities inside. The upper and lower ends of the branch pipe (47) are respectively connected to the cavities inside the corresponding converging cones (25) and dispersing cones (26). The cavity inside the dispersing cone (26) near the middle of the cooling separation cylinder (24) is connected to the liquid pipe two (28). The cavity inside the converging cone (25) near the top wall of the cooling separation cylinder (24) is connected to the liquid pipe six (27).

3. The method for producing photoinitiator by purifying device according to any one of claims 1-2, characterized in that: Includes the following steps: Step 1: The crude photoinitiator is efficiently dissolved using a hot-melt mechanism; Step 2: Driven by the hot-melt mechanism, the pump mechanism delivers the coolant and the solution obtained in Step 1 to the cooling separation mechanism respectively; Step 3: The hot-melt mechanism is intermittently and automatically fed through a pump mechanism; Step 4: The solution obtained in Step 1 is subjected to efficient cooling and recrystallization using a cooling separation mechanism; Step 5: The solid-liquid mixture obtained in Step 4 is separated by a cooling separation mechanism and discharged separately.

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