Reaction system for preparing light stabilizer

Abstract

The reaction system comprises a reaction kettle, a temperature control system, a feeding structure, a stirring structure, a conveying pipe, a filtering device, a material conveying system and a purification system, an opening structure at the top of the reaction kettle is provided with an upper cover, the stirring structure is arranged in the reaction kettle, the conveying pipe is arranged at the bottom of the reaction kettle, and the filtering device is arranged in the material conveying system. The material conveying system is arranged between the conveying pipe and the filtering device, the filtering device is arranged at one end of the conveying pipe away from the reaction kettle, and the purification system is arranged at one side of the filtering device away from the conveying pipe; compared with the prior art, the utility model has the advantages that after the reaction is finished, impurities in a reaction system are removed through filtration, then purification is carried out, and column chromatography in the system can be separated by utilizing the distribution coefficient difference of different substances between a stationary phase and a mobile phase, so that a high-purity light stabilizer is obtained, the reaction is rapid, and the operation is simple. Side reactions are few, and the reaction time is short.

Description

Technical Field

[0001] This invention relates to the field of light stabilizer preparation technology, specifically a reaction system for preparing light stabilizers. Background Technology

[0002] Light stabilizers are additives used to prevent the degradation of polymer materials due to ultraviolet radiation, and are widely used in plastics, rubber, fibers, and other fields. Their preparation process involves several key steps, including reaction, filtration, purification, and storage. The technical selection and optimization of each step have a significant impact on the quality and performance of the final product.

[0003] In terms of reaction technology, the synthesis of light stabilizers typically requires precise control of reaction conditions to ensure high purity and high yield of the product. For example, dissolving the raw materials in an alkaline environment using ethanolamine and reacting in a pipeline circulating reactor can reach the reaction endpoint in a short time. However, traditional reaction methods, such as the N-methylation reaction of formaldehyde / formic acid, produce saline wastewater, putting pressure on the environment. Regarding filtration and purification technology, filtration is an important step in removing solid impurities or insoluble substances during the reaction process, while purification is a key step in ensuring the high purity of light stabilizers. Filtration devices are usually equipped with precision filters, which can effectively remove impurities and improve product yield and quality. Purification methods include extraction, recrystallization, and column chromatography. Column chromatography utilizes the difference in partition coefficients between different substances in the stationary and mobile phases for separation, effectively removing impurities and further improving the purity of the target product. For example, post-treatment methods such as cooling water washing, decolorization, filtration, and cooling crystallization can significantly improve product purity. In terms of storage technology, the storage conditions of light stabilizers directly affect their stability and performance. Typically, light stabilizers need to be stored in dry, light-protected, and sealed conditions to prevent degradation due to moisture, light exposure, or oxidation. For example, the storage conditions for light stabilizer 622 require a softening temperature between 55 and 80°C and a certain standard of transmittance at specific wavelengths to ensure its performance during long-term storage. By improving reaction conditions, optimizing filtration and purification technologies, and implementing appropriate storage conditions, the production efficiency and product quality of light stabilizers can be significantly improved, while reducing environmental impact.

[0004] This invention provides a reaction system for preparing light stabilizers, including reaction, filtration and purification devices. Through the coordinated work of the above parts, the reaction system can achieve efficient and stable production of high-quality light stabilizers, while reducing production costs and energy consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a reaction system for preparing light stabilizers to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This invention provides a reaction system for preparing a light stabilizer, comprising:

[0008] A reaction vessel with an open top, a top cover, and a cavity in the side wall;

[0009] A temperature control system is located inside a cavity in the side wall of the reactor.

[0010] A feeding structure is provided in the upper cover;

[0011] A stirring structure is fixed to the upper cover and suspended inside the reaction vessel;

[0012] A delivery pipe is provided at the bottom of the reactor and is connected to the reactor. A control valve is provided at the connection between the delivery pipe and the reactor.

[0013] A filtration device is located at the end of the delivery pipe furthest from the reactor.

[0014] A material conveying system is provided between the reactor and the filtration device, and the material conveying system is connected to a conveying pipe;

[0015] A purification system is located on the side of the filter device away from the delivery pipe, and the purification system is connected to the filter device.

[0016] A storage tank is located on the side of the purification system away from the delivery pipe.

[0017] Furthermore, the temperature control system includes a temperature regulating device disposed within the cavity and connected to a control board.

[0018] As a specific embodiment of this utility model, the temperature control system changes the temperature of the reactor by circulating or reciprocating hot and cold media; or other conventional reactor temperature control methods.

[0019] Furthermore, the feeding structure includes a feed pipe, a pump, and a filter box. One end of the feed pipe is inserted through the top cover, and the other end is equipped with a filter box. The pump is placed between the top cover and the filter box and is connected through the feed pipe. The filtered raw material is pumped into the reactor for reaction, which improves the reaction efficiency and avoids impurities from affecting the reaction.

[0020] Furthermore, the stirring structure includes a rotating shaft, spiral blades, a scraper, and a motor. The motor is positioned above the upper cover, and the top of the rotating shaft is connected to the motor. The rotating shaft passes through the upper cover and is placed inside the reactor. Spiral blades are mounted on the rotating shaft. Furthermore, a U-shaped scraper is mounted at the bottom of the rotating shaft, and the scraper is positioned in contact with the inner wall of the reactor. The scraper promptly scrapes off the material, preventing raw materials or products from sticking to the wall and reducing yield.

[0021] Furthermore, the material conveying system includes multiple material storage boxes, the outlet of each material storage box is connected to the inside of the conveying pipe, and the outlet of each material storage box is equipped with a control valve two and a material pump one, with the material pump one located on the side of the control valve two near the material storage box.

[0022] Furthermore, the material storage box is also provided with a feed inlet, which is connected to the inside of the conveying pipe. A control valve three and a material pump two are provided at the connection between the feed inlet and the conveying pipe. The material pump two is located on the side of the control valve three near the material storage box. The material storage box is in a sealed state for material turnover, which facilitates the continuous operation of the subsequent filtration stage.

[0023] Furthermore, the filtration device incorporates a commonly used filter, preferably a precision filter. The use of a precision filter significantly improves filtration efficiency, removing finer particles and impurities that might otherwise be missed by ordinary filters. This ensures higher purity of the filtrate, crucial for applications requiring high-quality output. The precision filter provides a more precise filtration effect, effectively capturing smaller and more difficult-to-remove impurities.

[0024] Furthermore, the purification system is an extraction purification system, and the top of the purification system is equipped with a reflux pipe, which is connected to the reaction vessel.

[0025] This invention utilizes extraction and purification to effectively separate the target product from impurities, thereby improving product purity. The reflux tube design allows incompletely extracted target products to re-enter the reaction system, further enhancing extraction efficiency and reducing product loss.

[0026] The reflux pipe returns a portion of the extractant to the reactor, reducing extractant consumption and lowering production costs. This recycling of the extractant improves resource utilization and reduces waste emissions.

[0027] The reflux tube design avoids the problem of impurities being mixed in due to excessive extractant, further improving the purity and quality of the product.

[0028] The connection between the reflux pipe and the reactor makes the entire purification process more stable and reduces the problem of unstable purification effect caused by fluctuations in the amount of extractant.

[0029] The extraction and purification process is relatively simple and consumes less energy, offering a significant energy advantage compared to traditional distillation or other complex purification methods. The reflux tube design reduces the heating and cooling requirements of the extractant, further lowering energy consumption.

[0030] The purification system has a compact structure and a small footprint, making it suitable for large-scale production in limited spaces.

[0031] Compared with the prior art, the beneficial effects of this utility model are:

[0032] The reaction system for preparing light stabilizers according to this invention can be fully automated for both reaction and post-processing. After the reaction, impurities in the reaction system are removed by filtration, and then the system is purified by column chromatography. Different substances can be separated by utilizing the difference in the partition coefficients between the stationary phase and the mobile phase to obtain high-purity light stabilizers. The reaction is rapid, with few side reactions and a short reaction time. Attached Figure Description

[0033] Figure 1 This is a schematic structural diagram of the reaction system of this utility model.

[0034] Explanation of reference numerals in the attached figures

[0035] As shown in the figure: 1. Reactor; 2. Top cover; 3. Temperature control system; 301. Temperature regulating device; 302. Control panel; 4. Feeding structure; 401. Feed pipe; 402. Pump; 403. Filter box; 5. Stirring structure; 501. Rotating shaft; 502. Spiral blade; 503. Scraper; 504. Motor; 6. Conveying pipe; 7. Control valve one; 8. Filtering device; 9. Material conveying system; 901. Material storage tank; 902. Control valve two; 903. Material pump; 10. Purification system; 11. Storage tank; 12. Return pipe. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0037] A reaction system for preparing light stabilizers, such as Figure 1 As shown, it includes: a reaction vessel 1, a temperature control system 3, a feeding structure 4, a stirring structure 5, a conveying pipe 6, a filter device 8, a material conveying system 9, a purification system 10, and a storage tank 11.

[0038] The reactor 1 has an open top structure, a top cover 2 on the reactor 1, and a cavity in the side wall of the reactor 1.

[0039] Temperature control system 3 is located in the cavity of the side wall of reactor 1; temperature control system 3 includes temperature regulating device 301, which is located in the cavity and connected to control board 302.

[0040] Feeding structure 4 is located in the upper cover 2. The feeding structure 4 includes a feeding pipe 401, a pump 402 and a filter box 403. One end of the feeding pipe 401 is inserted into the upper cover 2 and the other end is provided with the filter box 403. The pump 402 is placed between the upper cover 2 and the filter box 403 and is connected through the feeding pipe 401.

[0041] A stirring structure 5 is fixed to the upper cover 2 and suspended inside the reactor 1. The stirring structure 5 includes a rotating shaft 501, a spiral blade 502, a scraper 503, and a motor 504. The motor 504 is positioned above the upper cover 2. The top of the rotating shaft 501 is connected to the motor 504, and the rotating shaft 501 passes through the upper cover 2 and is placed inside the reactor 1. The spiral blade 502 is mounted on the rotating shaft. A U-shaped scraper 503 is mounted at the bottom of the rotating shaft 501, and the scraper 503 is in contact with the inner wall of the reactor 1.

[0042] The conveying pipe 6 is located at the bottom of the reactor 1 and is connected to the reactor 1. A control valve 7 is provided at the connection between the conveying pipe 6 and the reactor 1.

[0043] Filtering device 8 is located at the end of the conveying pipe 6 away from the reactor 1;

[0044] A material conveying system 9 is located between the reactor 1 and the filter device 8, and is connected to a conveying pipe 6. The material conveying system 9 includes multiple material storage tanks 901, the outlet of each material storage tank 901 being connected to the inside of the conveying pipe 6. Each material storage tank 901 has a control valve 902 and a material pump 903 at its outlet, with the material pump 903 located near the control valve 902 on the side close to the material storage tank 901. Each material storage tank 901 also has an inlet (…). Figure 1 (Not shown), the feed inlet is connected to the inside of the conveying pipe 6, and a control valve three and a material pump two are provided at the connection between the feed inlet and the conveying pipe 6. Figure 1 (Not shown), the material pump 2 is located on the side of the control valve 3 near the material storage tank 901. The material storage tank is in a closed state and is used for material turnover to facilitate the continuous operation of the subsequent filtration stage.

[0045] Purification system 10 is located on the side of filter device 8 away from conveying pipe 6, and is connected to filter device 8; purification system 10 is for extraction purification, and reflux pipe 12 is provided at the top of purification system, and reflux pipe 12 is connected to reaction vessel 1.

[0046] Storage tank 11 is located on the side of the purification system 10 away from the delivery pipe 6.

[0047] Working principle:

[0048] This reaction system for preparing light stabilizers achieves efficient and continuous production through the coordinated operation of its components. The working principles and cooperation mechanisms of each part are as follows:

[0049] 1. Feed Structure 4: Raw materials are precisely metered and introduced into reactor 1 through feed structure 4. The feed structure typically includes a feed inlet for inputting raw materials, ensuring that the raw materials are accurately added to the reaction system according to predetermined requirements.

[0050] 2. Reactor 1: Reactor 1 is the core area of ​​the reaction, where the raw materials undergo chemical reactions. The reactor is equipped with a stirring structure 5, which ensures thorough mixing of the raw materials, guaranteeing the uniformity and efficiency of the reaction. A temperature control system 3 is connected to the reactor, precisely controlling the temperature inside the reactor through heating or cooling devices to maintain it within the optimal reaction temperature range, thereby ensuring the smooth progress of the reaction and the quality of the product.

[0051] 3. Stirring Structure 5: Stirring structure 5 provides mechanical stirring within the reactor, ensuring thorough mixing of reactants and preventing localized excessively high or low concentrations, thereby improving the reaction rate and product uniformity. The stirring speed can be adjusted according to reaction requirements.

[0052] 4. Conveyor Pipe 6: After the reaction is complete, the generated material is output from the reactor 1 through conveyor pipe 6. The conveyor pipe connects various components to ensure that the material can flow smoothly in the system.

[0053] 5. Filtering device 8: During the conveying process, the material first passes through the filtering device 8 to remove solid impurities or unreacted solid particles that may be generated during the reaction. The filtering device is equipped with a precision filter, which can effectively improve the filtration accuracy and ensure the smooth progress of subsequent processing.

[0054] 6. Material conveying system 9: The material conveying system includes valves, pipes and material storage tank 901 (specifically including inlet, control valve three, material pump two, outlet, control valve two 902 and material pump one 903). All of the above settings can adjust the stored materials and material output as needed to ensure continuous storage and output of materials.

[0055] 7. Purification System 10: Purification System 10 employs extraction purification. Column chromatography within the system utilizes the difference in partition coefficients between the stationary and mobile phases to separate the target product from impurities. The material contacts the extractant in the purification system; the target product dissolves in the extractant, while impurities remain in the aqueous phase or other solvents, thus achieving separation. A reflux pipe is installed at the top of the purification system, connected to the reaction vessel 1. Incompletely extracted target product or a portion of the extractant is returned to the reaction vessel through the reflux pipe, further improving extraction efficiency and reducing product loss.

[0056] Its working principle is as follows:

[0057] (a) Selection of stationary and mobile phases: Stationary phase: The stationary phase is a solid or liquid substance packed within the chromatography column, typically silica gel, alumina, polystyrene, etc. These materials have different polarities and pore structures, enabling them to undergo physical or chemical adsorption with the substances to be separated. Mobile phase: The mobile phase is a liquid or gas that passes through the chromatography column, typically an organic solvent (such as ethanol, toluene, ethyl acetate, etc.) or an aqueous solution. The selection of the mobile phase needs to be optimized based on the polarity of the target substance and impurities to achieve the best separation effect.

[0058] (b) Sample loading: The product to be purified is dissolved in a suitable solvent and then loaded onto the top of the chromatography column. The individual components in the sample begin to partition between the stationary phase and the mobile phase.

[0059] (c) Partitioning Process: When the mobile phase passes through the chromatography column, different components in the sample will be partitioned between the stationary phase and the mobile phase. The partition coefficient is a parameter that measures the ability of a substance to partition between the stationary and mobile phases, defined as the ratio of the concentration of the substance in the stationary phase to its concentration in the mobile phase. Components with different partition coefficients migrate at different rates in the chromatography column. Components with larger partition coefficients have a longer residence time and slower migration rate in the stationary phase; components with smaller partition coefficients have a longer residence time and faster migration rate in the mobile phase.

[0060] (d) Separation process: As the mobile phase continues to flow, different components gradually separate in the chromatography column. Due to the difference in migration velocity, the components are gradually separated in the chromatography column, resulting in different separations.

[0061] (e) Elution process: As the components elute from the chromatography column, the target product and impurities are collected separately using a collection device. The elution process can be optimized by changing the composition or polarity of the mobile phase to achieve better separation. Typically, the elution process starts with a low-polarity solvent and gradually increases the polarity of the solvent to elute components of different polarities sequentially.

[0062] (f) Repeated operations: In some cases, to further improve purity, the collected target product can be subjected to multiple column chromatography operations to gradually remove residual impurities. Through column chromatography, the purification system can efficiently separate the target product from impurities, ensuring the high purity and quality of the light stabilizer and providing a reliable guarantee for subsequent applications.

[0063] 8. Storage Tank 11: The purified light stabilizer is piped to storage tank 11 for storage. The storage tank is usually equipped with a sealing device to prevent the product from being contaminated or volatilized during storage.

[0064] Collaborative working mechanism

[0065] Continuity: The entire system is connected by pipelines, enabling continuous operation from raw material feeding, reaction, filtration, purification to product storage. This continuous production method greatly improves production efficiency and reduces the risk of human intervention and operational errors.

[0066] Automated control: The automated control of components such as the temperature control system 3, stirring structure 5, and material conveying system 9 ensures the stability and consistency of the entire production process. Through sensors and controllers, the system can automatically adjust reaction conditions and material conveying speed according to preset parameters.

[0067] Resource recycling: The reflux pipe design in the purification system enables the recycling of the extractant, reducing resource waste and lowering production costs. Simultaneously, the reflux mechanism also improves the recovery rate of the target product, further optimizing the production process.

[0068] Raw materials are fed into reactor 1 through feeding structure 4. Temperature control system 3 regulates and controls the required reaction temperature in reactor 1. Stirring structure 5 stirs the reaction. After the reaction is completed, control valve 1 7 is activated, and the material is output through the conveying pipe. Control valve 3 and material pump 2 are activated in sequence to feed the material into each material storage box 901. The material storage boxes 901 are stored in sequence. Control valve 2 902 and material pump 1 903 are activated in sequence to transport the material in each material storage box 901 to the filtration device. The filtered material enters the purification system 10 for purification. The purified material is stored in storage box 11.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0070] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. A reaction system for preparing a light stabilizer, characterized in that, include: The reactor (1) has an open top structure, a top cover (2) on the reactor (1), and a cavity is opened in the side wall of the reactor (1). Temperature control system (3), wherein the temperature control system (3) is located in the cavity of the side wall of the reactor (1); Feeding structure (4), wherein the feeding structure (4) is disposed in the upper cover (2); The stirring structure (5) is fixed to the upper cover (2) and suspended inside the reactor (1); The conveying pipe (6) is located at the bottom of the reactor (1) and is connected to the reactor (1). A control valve (7) is provided at the connection between the conveying pipe (6) and the reactor (1). A filter device (8) is located at the end of the conveying pipe (6) away from the reactor (1); Material conveying system (9), which is located between the reactor (1) and the filter device (8), and is connected to the conveying pipe (6). Purification system (10), wherein the purification system (10) is located on the side of the filter device (8) away from the conveying pipe (6), and the purification system (10) is connected to the filter device (8); Storage tank (11) is located on the side of the purification system (10) away from the delivery pipe (6).

2. The reaction system for preparing a light stabilizer according to claim 1, characterized in that, The temperature control system (3) includes a temperature regulating device (301), which is located in the cavity and is connected to the control board (302).

3. The reaction system for preparing a light stabilizer according to claim 1, characterized in that, The feeding structure (4) includes a feeding pipe (401), a pump (402) and a filter box (403). One end of the feeding pipe (401) is inserted through the upper cover (2), and the other end is provided with a filter box (403). The pump (402) is placed between the upper cover (2) and the filter box (403) and is connected through the feeding pipe (401).

4. The reaction system for preparing a light stabilizer according to claim 1, characterized in that, The stirring structure (5) includes a rotating shaft (501), a spiral blade (502), a scraper (503), and a motor (504). The motor (504) is placed above the upper cover (2). The top of the rotating shaft (501) is connected to the motor (504). The rotating shaft (501) passes through the upper cover (2) and is placed inside the reactor (1). The spiral blade (502) is provided on the rotating shaft.

5. The reaction system for preparing a light stabilizer according to claim 4, characterized in that, The bottom of the rotating shaft (501) is provided with a U-shaped scraper (503), which is in contact with the inner wall of the reactor (1).

6. The reaction system for preparing a light stabilizer according to claim 1, characterized in that, The material conveying system (9) includes multiple material storage boxes (901). The outlet of the material storage box (901) is connected to the inside of the conveying pipe (6). The outlet of the material storage box (901) is equipped with a control valve two (902) and a material pump one (903). The material pump one (903) is located on the side of the control valve two (902) near the material storage box (901).

7. The reaction system for preparing a light stabilizer according to claim 6, characterized in that, The material storage box (901) is also provided with a feed inlet, which is connected to the inside of the conveying pipe (6). A control valve three and a material pump two are provided at the connection between the feed inlet and the conveying pipe (6). The material pump two is located on the side of the control valve three near the material storage box (901).

8. The reaction system for preparing a light stabilizer according to claim 1, characterized in that, The purification system (10) is for extraction and purification. The top of the purification system is provided with a reflux pipe (12), which is connected to the reactor (1).

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