Photoinitiator crystallization device

Abstract

The utility model discloses a photoinitiator crystallization device which comprises a crystallization kettle, a stirring shaft, a stirring motor, a liquid inlet and a crystallization outlet, a liquid spraying pipe is arranged on the inner wall of the bottom of the crystallization kettle, uniformly distributed liquid spraying holes are formed in the upper end face of the liquid spraying pipe, and the liquid spraying pipe is connected with a liquid storage device through a liquid spraying inlet outside the crystallization kettle; a circulating cover is further arranged on the side wall of the lower end of the crystallization kettle, the circulating cover is connected with the upper end of the crystallization kettle through a circulating pipe, a circulating pump is mounted on the circulating pipe, and the circulating pipe is connected with a liquid discharging pipe through a three-way connector; by arranging the circulating pump and the circulating pipe, photoinitiator liquid can be subjected to circulating crystallization, the crystallized liquid is discharged into the concentration tank through the liquid discharging pipe to be concentrated, liquid sprayed out of the liquid spraying pipe scours the inner wall of the crystallization kettle, wall sticking is avoided, the conical stirring blades clean the bottom of the crystallization kettle at the same time, and the crystallization kettle is convenient to use. The continuous reaction can be realized, and the production efficiency is higher.

Description

Technical Field

[0001] This utility model relates to the field of photoinitiator production technology, and in particular to a photoinitiator crystallization device. Background Technology

[0002] Photoinitiators, also known as photosensitizers or photocuring agents, are compounds that absorb energy of a certain wavelength in the ultraviolet or visible light region, generating free radicals, cations, etc., thereby initiating monomer polymerization, cross-linking, and curing. To improve the purity of photoinitiators, a crystallization step is required in their manufacturing process. Traditional photoinitiator crystallization devices often produce crystals that adhere to the inner wall of the tank during crystallization, making cleaning time-consuming and labor-intensive, and hindering the assessment of crystallization progress. Furthermore, cleaning the inner wall of the tank can easily scratch the vessel. This invention addresses these shortcomings by improving upon existing crystallization reactors. Utility Model Content

[0003] The purpose of this invention is to provide a photoinitiator crystallization device.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A photoinitiator crystallization device includes a crystallization vessel, a stirring shaft, a stirring motor, a liquid inlet, and a crystallization outlet. The stirring motor is installed at the top of the crystallization vessel, and the stirring shaft is installed inside the crystallization vessel and is drively connected to the stirring motor. Stirring blades are installed on the stirring shaft. The liquid inlet is installed at the top of the crystallization vessel, and the crystallization outlet is installed at the bottom of the crystallization vessel. A spray pipe is provided on the inner wall of the bottom of the crystallization vessel, and the upper end face of the spray pipe has evenly distributed spray holes. The spray pipe is connected to a liquid storage device through a spray inlet outside the crystallization vessel. A circulation hood is also provided on the lower side wall of the crystallization vessel. The circulation hood is connected to the upper end of the crystallization vessel through a circulation pipe. A circulation pump is installed on the circulation pipe, and the circulation pipe is connected to a drain pipe through a three-way connector. A valve one is installed on the drain pipe, and a valve two is installed on the circulation pipe.

[0006] Furthermore, the bottom of the crystallization vessel is configured as a conical structure, a conical stirring blade is installed at the bottom of the stirring shaft, and a scraper plate is provided below the conical stirring blade to contact the conical wall of the crystallization vessel.

[0007] Furthermore, the scraper and the conical stirring blade are set at a 150-degree angle, and a flexible scraper strip is provided at the position where the scraper contacts the conical wall.

[0008] Furthermore, the crystallization vessel is provided with a cooling jacket on its exterior, with the bottom of the cooling inlet of the jacket located on the lower side of the jacket and the cooling outlet located on the upper side of the jacket.

[0009] Furthermore, the inlet side of the circulation hood is provided with a filter plate, and the filter plate is provided with evenly distributed filter holes.

[0010] In summary, this utility model has the following beneficial effects: by setting up a circulating pump and a circulating pipe, the photoinitiator liquid can be circulated and crystallized, and the crystallized liquid can be discharged into a concentration tank for concentration through a drain pipe. The liquid sprayed out by the spray pipe washes the inner wall of the crystallization vessel to prevent it from sticking to the wall, and the conical stirring blades clean the bottom of the crystallization vessel at the same time. This utility model can carry out continuous reaction and has high production efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the reaction vessel of this utility model;

[0012] Figure 2 This is a partial enlarged view of the present invention;

[0013] Figure 3 This is a cross-sectional view of the conical stirring blades.

[0014] In the diagram, 1. Crystallization vessel; 2. Jacket; 3. Stirring shaft; 4. Stirring motor; 5. Stirring blade; 6. Conical stirring blade; 7. Liquid inlet; 8. Crystallization outlet; 9. Scraper; 10. Cooling inlet; 11. Cooling outlet; 12. Circulation pipe; 13. Circulation pump; 14. Circulation hood; 15. Drain pipe; 16. Valve 1; 17. Valve 2; 18. Spray pipe; 19. Spray inlet; 20. Filter plate; 21. Spray hole; 22. Flexible scraper. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention will be clearly and completely described. 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 protection scope of the present invention.

[0016] like Figure 1 and Figure 2As shown, a photoinitiator crystallization device includes a crystallization vessel 1, a stirring shaft 3, a stirring motor 4, a liquid inlet 7, and a crystallization outlet 8. The stirring motor 4 is installed at the top of the crystallization vessel 1, and the stirring shaft 3 is installed inside the crystallization vessel 1, with a driving connection between the stirring shaft 3 and the stirring motor 4. Stirring blades 5 are installed on the stirring shaft 3. The liquid inlet 7 is installed at the top of the crystallization vessel 1, and the crystallization outlet 8 is installed at the bottom of the crystallization vessel 1. A spray pipe 18 is provided on the inner wall of the bottom of the crystallization vessel 1. The upper end face of the pipe 18 is provided with evenly distributed spray holes 21. The spray pipe 18 is connected to the liquid storage device through the spray inlet 19 outside the crystallization vessel 1. The lower side wall of the crystallization vessel 1 is also provided with a circulation cover 14. The circulation cover 14 is connected to the upper end of the crystallization vessel 1 through a circulation pipe 12. A circulation pump 13 is installed on the circulation pipe 12. The circulation pipe 12 is connected to the drain pipe 15 through a three-way connector. A valve 16 is installed on the drain pipe 15. A valve 2 17 is provided on the circulation pipe 12.

[0017] Furthermore, the bottom of the crystallization vessel 1 is configured as a conical structure, and a conical stirring blade 6 is installed at the bottom of the stirring shaft 3. A scraper 9 that contacts the conical wall of the crystallization vessel 1 is provided below the conical stirring blade 6.

[0018] Furthermore, such as Figure 3 As shown, the scraper 9 and the conical stirring blade 6 are set at a 150-degree angle. A flexible scraper 22 is provided at the position where the scraper 9 contacts the conical wall. The flexible scraper 22 is made of flexible plastic. When stirring, the folded edge structure of the scraper 9 will impact the bottom of the crystallizer 1, preventing crystals from sticking to the inner wall of the crystallizer 1.

[0019] Furthermore, the crystallization vessel 1 is provided with a cooling jacket 2 on its exterior. The bottom of the cooling inlet 10 of the jacket 2 is located on the lower side of the jacket 2, and the cooling outlet 11 is located on the upper side of the jacket 2. The jacket 2 cools down the crystallization vessel 1, thereby causing the photoinitiator to crystallize and precipitate.

[0020] Furthermore, the inlet side of the circulation hood 14 is provided with a filter plate 20, which has evenly distributed filter holes. The filter plate 20 filters the crystals to prevent them from being discharged from the drain pipe 15.

[0021] Working principle: The liquid to be crystallized is added into the crystallization vessel 1 through the inlet 7. The jacket 2 cools the crystallization vessel 1. The photoinitiator crystals are cooled and precipitated during the stirring process of the stirring shaft 3. The spray pipe 18 flushes the inner wall of the crystallization vessel 1 to prevent it from sticking to the wall. The bottom of the crystallization vessel 1 is cleaned by the conical stirring blade 6. The circulation pipe 12 and the circulation pump 13 circulate the liquid. At the same time, the crystallized liquid is discharged into the concentration tank for concentration through the drain pipe 15. The spray inlet 19 can also be connected to the concentration tank through the pipeline and the high-pressure pump to pump the concentrated liquid back into the crystallization vessel 1. The precipitated crystals can be discharged and collected from the crystallization outlet 8.

[0022] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A photoinitiator crystallization apparatus, comprising a crystallization vessel (1), a stirring shaft (3), a stirring motor (4), a liquid inlet (7), and a crystallization outlet (8), wherein the stirring motor (4) is installed on the top of the crystallization vessel (1), and the stirring shaft (3) is installed inside the crystallization vessel (1). The stirring shaft (3) is connected to the stirring motor (4) for transmission. Stirring blades (5) are mounted on the stirring shaft (3). The liquid inlet (7) is installed at the top of the crystallization vessel (1), and the crystallization outlet (8) is installed at the bottom of the crystallization vessel (1). The characteristic feature is that: The bottom inner wall of the crystallization vessel (1) is provided with a spray pipe (18), and the upper end face of the spray pipe (18) is provided with evenly distributed spray holes (21). The spray pipe (18) is connected to the liquid storage device through the spray inlet (19) outside the crystallization vessel (1). The lower side wall of the crystallization vessel (1) is also provided with a circulation cover (14). The circulation cover (14) is connected to the upper end of the crystallization vessel (1) through a circulation pipe (12). A circulation pump (13) is installed on the circulation pipe (12). The circulation pipe (12) is connected to the drain pipe (15) through a three-way connector. A valve one (16) is installed on the drain pipe (15). A valve two (17) is provided on the circulation pipe (12).

2. The photoinitiator crystallization apparatus according to claim 1, characterized in that: The bottom of the crystallization vessel (1) is set in a conical structure, and a conical stirring blade (6) is installed at the bottom of the stirring shaft (3). A scraper (9) that contacts the conical wall of the crystallization vessel (1) is provided below the conical stirring blade (6).

3. The photoinitiator crystallization apparatus according to claim 2, characterized in that: The scraper (9) and the conical stirring blade (6) are set at a 150-degree angle, and a flexible scraper (22) is provided at the position where the scraper (9) contacts the conical wall.

4. The photoinitiator crystallization apparatus according to claim 3, characterized in that: The crystallization vessel (1) is provided with a jacket (2) for cooling. The bottom of the cooling inlet (10) of the jacket (2) is located on the lower side of the jacket (2), and the cooling outlet (11) is located on the upper side of the jacket (2).

5. The photoinitiator crystallization apparatus according to claim 1, characterized in that: The circulation hood (14) is provided with a filter plate (20) on the liquid inlet side, and the filter plate (20) is provided with evenly distributed filter holes.

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