A device for concentrating and crystallizing itaconic acid

Abstract

The application relates to the technical field of concentrated crystallization devices, and discloses a concentrated crystallization device for itaconic acid, which comprises a tank body, the top of the tank body is provided with a cover, the bottom of the tank body is provided with a discharge pipe, an eccentric stirring mechanism is arranged on the tank body, and a reverse stirring mechanism is arranged on the inner wall of the tank body. The concentrated crystallization device for itaconic acid is provided with the eccentric stirring mechanism, so that the first rotating plate, the second rotating plate and the connecting block rotate and reciprocate at the same time, efficient mixing and homogenization of liquid are realized, the reciprocating motion can break the laminar flow state of the liquid, the flow between liquids with different temperatures and concentrations is enhanced, uniform precipitation of crystals is promoted, local supersaturation or insufficient saturation is avoided, in addition, the motion can also improve the heat exchange efficiency, the uniform distribution of temperature in the crystallization process is ensured, the quality of products is optimized, the crystallization efficiency is improved, and the working performance and production efficiency of the equipment are overall improved.

Description

Technical Field

[0001] This invention relates to the field of concentration and crystallization equipment technology, specifically to an itaconic acid concentration and crystallization equipment. Background Technology

[0002] Itaconic acid concentration crystallization is a process that extracts and purifies itaconic acid from a solution using crystallization technology. This process typically involves lowering the solution temperature or altering the solution concentration to promote the precipitation of itaconic acid. Itaconic acid is an important biosynthetic intermediate widely used in pharmaceuticals, food, and cosmetics. The advantage of concentration crystallization is that it yields a high-purity product and reduces impurities, thereby improving the effectiveness and safety of subsequent applications.

[0003] In the concentration and crystallization process of itaconic acid, simple stirring is insufficient to achieve homogenization. This is because simple stirring easily creates circulation and eddies, resulting in a certain flow pattern around the stirrer. Consequently, some parts of the liquid remain stagnant for extended periods, failing to mix effectively and creating temperature and concentration gradients. Furthermore, the uneven distribution of solute concentration in the solution due to gravity makes it difficult for simple stirring to quickly and uniformly mix liquids of different concentrations, leading to localized supersaturation or undersaturation, which affects crystal precipitation and growth. Poor homogenization results in uneven crystal growth, forming irregular or large crystals, reducing the purity and quality of the product. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides an itaconic acid concentration and crystallization apparatus, which solves the problem that simple stirring is insufficient to achieve homogenization, leading to uneven crystal growth and reduced product purity.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: an itaconic acid concentration and crystallization device, comprising a tank, a lid provided on the top of the tank, a discharge pipe provided at the bottom of the tank, an eccentric stirring mechanism provided on the tank, a reverse stirring mechanism provided on the inner wall of the tank, and an inner wall scraping mechanism provided on the inner wall of the tank.

[0008] The eccentric stirring mechanism is used to homogenize the liquid in the tank, the reverse stirring mechanism is used to exchange the liquid between the upper and lower layers in the tank, and the inner wall scraping mechanism is used to scrape the inner wall of the tank.

[0009] Preferably, the eccentric stirring mechanism includes a drive motor, which is fixedly connected to the bottom of the tank. An intermittent gear is fixedly connected to the output shaft of the drive motor. A planetary gear is rotatably connected to the bottom of the tank. A main shaft is fixedly connected to the top of the planetary gear. One end of a first rotating plate is hinged to the outer wall of the main shaft. One end of a second rotating plate is hinged to the other end of the first rotating plate. A connecting block is hinged to the other end of the second rotating plate. One end of a spring is fixedly connected to the outer wall of the connecting block. The other end of the spring is fixedly connected to the outer wall of the main shaft.

[0010] Preferably, the surface portion of the intermittent gear has no teeth, and two sets of the first and second rotating plates are provided, with the two sets of the first and second rotating plates arranged symmetrically.

[0011] Preferably, the main shaft is eccentrically positioned, and the outer wall of the main shaft is rotatably connected to the inner wall of the tank.

[0012] Preferably, the reverse stirring mechanism includes a connecting rod, one end of which is fixedly connected to the bottom of the inner wall of the tank, the other end of which is rotatably connected to a lower gear ring, a transmission gear rotatably connected to the outer wall of the connecting rod, an upper gear ring rotatably connected to the outer wall of the connecting rod, and an impeller fixedly connected to the top of the upper gear ring.

[0013] Preferably, the top of the lower gear ring is provided with an annular gear ring, and the outer wall of the transmission gear meshes with the annular gear ring of the lower gear ring.

[0014] Preferably, the bottom of the upper gear ring is provided with an annular gear ring, and the annular gear ring at the bottom of the upper gear ring meshes with the transmission gear.

[0015] Preferably, the inner wall scraping mechanism includes a gear disk, which is fixedly connected to the outer wall of the main shaft. An intermediate gear is rotatably connected to the bottom of the inner wall of the tank. A bottom gear ring is rotatably connected to the bottom of the inner wall of the tank. A wiping component is rotatably connected to the top of the bottom gear ring. A top gear is fixedly connected to the top of the wiping component. A top gear ring is fixedly connected to the top of the tank.

[0016] Preferably, the outer wall of the gear disk meshes with the intermediate gear, an internal gear ring is provided on the inner wall of the bottom gear ring, and an internal gear ring is provided on the inner wall of the top gear ring.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides an itaconic acid concentration and crystallization apparatus, which has the following beneficial effects:

[0019] 1. This itaconic acid concentration and crystallization device utilizes an eccentric stirring mechanism, which causes the first rotating plate, the second rotating plate, and the connecting block to reciprocate simultaneously during the stirring process. This achieves efficient mixing and homogenization of the liquid. The reciprocating motion breaks the laminar flow state of the liquid, enhances the flow between liquids of different temperatures and concentrations, promotes uniform crystal precipitation, and avoids local oversaturation or undersaturation. In addition, this motion can also improve heat exchange efficiency, ensure uniform temperature distribution during the crystallization process, thereby optimizing product quality and improving crystallization efficiency, and enhancing the overall working performance and production efficiency of the equipment.

[0020] 2. This itaconic acid concentration and crystallization device utilizes an eccentric stirring mechanism. The stirring section is positioned eccentrically, which breaks the symmetrical flow pattern, generating uneven flow and turbulence. This effectively promotes the rapid mixing of liquids with different concentrations and temperatures, reducing local oversaturation or undersaturation. Furthermore, the eccentric position improves the power efficiency of the stirring mechanism because the eccentric design makes the flow path generated by the stirring blades more complex during movement, increasing the intensity of liquid turbulence and thus improving the overall mixing efficiency. This ensures uniform distribution of the liquid within the tank, optimizes heat exchange, and improves the overall efficiency of the crystallization process, thereby enhancing product quality and consistency.

[0021] 3. This itaconic acid concentration and crystallization device utilizes a reverse stirring mechanism. The impeller drives the liquid at the top to flow downward to the eccentric stirring mechanism, increasing the vertical exchange of liquid, enhancing the mixing and homogeneity of the liquid, promoting the effective combination of liquids with different temperatures and concentrations, preventing stratification, increasing the solute dissolution rate during the crystallization process, and ensuring the uniformity and quality of the product. In addition, this vertical liquid exchange can also improve heat exchange efficiency, ensure uniform temperature distribution within the system, and thus optimize the overall crystallization effect.

[0022] 4. This itaconic acid concentration and crystallization device utilizes an internal wall scraping mechanism. The main shaft drives the gear disk to rotate, and the gear disk drives the bottom gear ring to rotate in the opposite direction to the main shaft through the middle gear. The bottom gear ring drives the wiping component to rotate in the opposite direction to the main shaft. At this time, the wiping component rotates in the opposite direction to the eccentric stirring mechanism, forming convection in the opposite direction to the rotation of the eccentric stirring mechanism. This convection helps to break the static layer of the liquid, improve the fluidity of the liquid, and further enhance the mixing effect.

[0023] 5. This itaconic acid concentration and crystallization device utilizes an internal wall scraping mechanism. The wiping component wipes the inner wall of the tank. The main function of the wiping component in wiping the inner wall of the tank is to improve the homogenization effect. First, wiping can remove deposits and crystals on the inner wall, preventing these residues from affecting the mixing of the liquid and avoiding local oversaturation or undersaturation. This ensures that the liquid state in the entire tank is uniform. In addition, the wiping component can promote the circulation of the liquid during its movement, thereby further improving the mixing efficiency, ensuring the consistency of temperature and concentration, and ultimately optimizing the crystallization process, improving the quality and consistency of the product.

[0024] 6. This itaconic acid concentration and crystallization device utilizes an internal wall scraping mechanism. The wiping element can not only move linearly when wiping the inner wall of the tank, but also rotate, thereby achieving a more comprehensive cleaning effect. The rotation ensures that the wiping element covers a wider area when in contact with the inner wall, effectively removing residues and deposits on the inner wall and improving cleaning efficiency. In addition, the rotation motion can also enhance the interaction between the wiping element and the liquid, promote liquid flow, further improve the homogenization effect, and ensure that the liquid state remains uniform during the crystallization process, thereby further optimizing the quality and purity of the final product. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an itaconic acid concentration and crystallization device proposed in this invention;

[0026] Figure 2 This is a schematic cross-sectional view of the tank body of an itaconic acid concentration and crystallization device proposed in this invention;

[0027] Figure 3 This is a schematic diagram of the intermittent gear structure of an itaconic acid concentration and crystallization device proposed in this invention;

[0028] Figure 4 This is a schematic diagram of the eccentric stirring mechanism of an itaconic acid concentration and crystallization device proposed in this invention;

[0029] Figure 5 This is a schematic diagram of the reverse stirring mechanism of an itaconic acid concentration and crystallization device proposed in this invention;

[0030] Figure 6 This is a schematic diagram of the inner wall scraping mechanism of an itaconic acid concentration and crystallization device proposed in this invention.

[0031] In the diagram: 1. Tank body; 2. Lid; 3. Discharge pipe; 4. Eccentric stirring mechanism; 41. Drive motor; 42. Intermittent gear; 43. Planetary gear; 44. Main shaft; 45. First rotating plate; 46. Second rotating plate; 47. Connecting block; 48. Spring; 5. Reverse stirring mechanism; 51. Connecting rod; 52. Transmission gear; 53. Lower gear ring; 54. Upper gear ring; 55. Impeller; 6. Inner wall scraping mechanism; 61. Gear disk; 62. Intermediate gear; 63. Bottom gear ring; 64. Wiping component; 65. Top gear; 66. Top gear ring. Detailed Implementation

[0032] 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.

[0033] Please see Figures 1-6 An itaconic acid concentration and crystallization apparatus includes a tank 1, which is a device for concentrating and crystallizing itaconic acid and can perform heating. A lid 2 is installed on the top of the tank 1. In this itaconic acid concentration and crystallization apparatus, the lid 2 primarily prevents external contamination, maintains a stable internal environment, avoids the loss of volatile substances, and reduces the entry of dust and other impurities. This helps control reaction conditions, improves the quality and purity of crystals, and also provides safety by preventing liquid spillage or accidental leakage, ensuring the safety and effectiveness of the operation. The bottom of tank 1 is provided with a discharge pipe 3. The main function of the discharge pipe 3 at the bottom of tank 1 is to facilitate the discharge of the crystallized liquid or precipitate, ensuring the continuity and efficiency of operation. The discharge pipe 3 can help remove the formed crystals or impurities in time, preventing them from accumulating in tank 1 and avoiding the impact on subsequent processes. In addition, the discharge pipe 3 is also convenient for cleaning and maintenance, keeping the equipment in good working condition and ensuring the smooth progress of the production process. Tank 1 is provided with an eccentric stirring mechanism 4, a reverse stirring mechanism 5 on the inner wall of tank 1, and an inner wall scraping mechanism 6 on the inner wall of tank 1.

[0034] The eccentric stirring mechanism 4 is used to homogenize the liquid in tank 1. Its function is to enhance the mixing effect by breaking the symmetrical flow pattern of the liquid. Compared with central stirring, the eccentric setting can effectively promote the uniform distribution of liquids of different concentrations and temperatures, reduce local supersaturation, and ensure uniform crystal growth. Furthermore, the eccentric stirring mechanism 4 can increase turbulence intensity and improve heat exchange efficiency, thereby improving overall production efficiency and product quality. The counter-stirring mechanism 5 is used to exchange liquid between the upper and lower layers in tank 1. Its function is to effectively break the laminar flow state of the liquid and promote the mixing of liquids of different depths. The mixing of liquids enhances the flow between the upper and lower layers, avoids stratification, ensures uniform temperature and concentration distribution, improves the solute dissolution rate, and prevents precipitate formation, thereby optimizing the crystallization process and improving product quality and yield. The inner wall scraping mechanism 6 is used to scrape the inner wall of the tank 1. Its function is to prevent the accumulation of crystalline substances and impurities on the inner wall, keep the inner wall clean, thereby ensuring good heat exchange efficiency and avoiding operational problems caused by scaling. In addition, the inner wall scraping mechanism 6 can reduce the workload of cleaning and maintenance, ensure the normal operation of the equipment, and improve production efficiency and product quality.

[0035] The eccentric stirring mechanism 4 includes a drive motor 41, which is fixedly connected to the bottom of the tank 1. An intermittent gear 42 is fixedly connected to the output shaft of the drive motor 41. A planetary gear 43 is rotatably connected to the bottom of the tank 1. A main shaft 44 is fixedly connected to the top of the planetary gear 43. One end of a first rotating plate 45 is hinged to the outer wall of the main shaft 44. One end of a second rotating plate 46 is hinged to the other end of the first rotating plate 45. A connecting block 47 is hinged to the other end of the second rotating plate 46. A spring is fixedly connected to the outer wall of the connecting block 47. One end of spring 48 is fixedly connected to the outer wall of main shaft 44. The surface of intermittent gear 42 has no teeth. After intermittent gear 42 drives planetary gear 43 to rotate for a period of time, the planetary gear 43 enters an intermittent state due to the toothless part. Two sets of first rotating plate 45 and second rotating plate 46 are set up. The two sets of first rotating plate 45 and second rotating plate 46 are set symmetrically. Main shaft 44 is set eccentrically. The outer wall of main shaft 44 is rotatably connected to the inner wall of tank 1, so that main shaft 44 rotates stably. Open the lid 2 on top of tank 1, pour the raw material to be concentrated and crystallized into tank 1, and then turn on the drive motor 41. The drive motor 41 drives the intermittent gear 42 to rotate. When the toothed part of the intermittent gear 42 meshes with the planetary gear 43, it drives the planetary gear 43 to rotate. When the toothless part of the intermittent gear 42 rotates to one side of the planetary gear 43, the planetary gear 43 is no longer driven. When the planetary gear 43 rotates, it drives the main shaft 44 to rotate. The main shaft 44 drives the first rotating plate 45, the second rotating plate 46, and the connecting block 47 to rotate. Under the action of centrifugal force, the connecting block 47 drives the spring 48 to stretch. At this time, the first rotating plate 45 and the second rotating plate 46 rotate relative to each other to a larger intersection angle, and the connecting block 47 moves away from the main shaft 44. When the planetary gear 43 stops rotating, the spring 48 drives the connecting block 47 to return to its original position, causing the first rotating plate 45 and the second rotating plate 46 to rotate relative to each other to a smaller intersection angle. This allows the first rotating plate 45, the second rotating plate 46, and the connecting block 47 to reciprocate simultaneously during the stirring process, achieving efficient mixing and homogenization of the liquid. The reciprocating motion can break the laminar flow state of the liquid, enhance the flow between liquids of different temperatures and concentrations, promote the uniform precipitation of crystals, and avoid local oversaturation or undersaturation. In addition, this motion can also improve heat exchange efficiency, ensure uniform temperature distribution during crystallization, thereby optimizing product quality and improving crystallization efficiency, and improving the overall working performance and production efficiency of the equipment.

[0036] Furthermore, the stirring part is set in an eccentric position. The eccentric design can break the symmetrical flow pattern and generate uneven flow and turbulence, which can effectively promote the rapid mixing of liquids with different concentrations and temperatures.

[0037] The reverse stirring mechanism 5 includes a connecting rod 51, one end of which is fixedly connected to the bottom of the inner wall of the tank 1, and the other end of which is rotatably connected to a lower gear ring 53. A transmission gear 52 is rotatably connected to the outer wall of the connecting rod 51. An upper gear ring 54 is rotatably connected to the outer wall of the connecting rod 51. An impeller 55 is fixedly connected to the top of the upper gear ring 54. An annular gear ring is provided on the top of the lower gear ring 53. The outer wall of the transmission gear 52 meshes with the annular gear ring of the lower gear ring 53. An annular gear ring is provided on the bottom of the upper gear ring 54. The annular gear ring at the bottom of the upper gear ring 54 meshes with the transmission gear 52, thus playing a transmission role and realizing power transmission. The main shaft 44 drives the lower gear ring 53 to rotate, which in turn drives the transmission gear 52 to rotate. The transmission gear 52 drives the upper gear ring 54 to rotate in the opposite direction to the lower gear ring 53. The upper gear ring 54 drives the impeller 55 to rotate, and the impeller 55 drives the liquid at the top to flow to the eccentric stirring mechanism 4 at the bottom. This increases the vertical exchange of liquid, enhances the mixing and homogeneity of the liquid, promotes the effective combination of liquids with different temperatures and concentrations, prevents stratification, increases the solute dissolution rate during the crystallization process, and ensures the uniformity and quality of the product. In addition, this vertical liquid exchange can also improve the heat exchange efficiency, ensure the uniform temperature distribution within the system, and thus optimize the overall crystallization effect.

[0038] The inner wall scraping mechanism 6 includes a gear disk 61, which is fixedly connected to the outer wall of the main shaft 44. An intermediate gear 62 is rotatably connected to the bottom of the inner wall of the tank 1, and a bottom gear ring 63 is rotatably connected to the bottom of the inner wall of the tank 1. A wiping element 64 is rotatably connected to the top of the bottom gear ring 63, and a top gear 65 is fixedly connected to the top of the wiping element 64. A top gear ring 66 is fixedly connected to the top of the tank 1. The outer wall of the gear disk 61 meshes with the intermediate gear 62. An internal gear ring is provided on the inner wall of the bottom gear ring 63, allowing the internal gear ring of the bottom gear ring 63 to mesh and drive with the intermediate gear 62. An internal gear ring is provided on the inner wall of the top gear ring 66, so that the internal gear ring of the top gear ring 66 meshes with the top gear 65. The main shaft 44 drives the gear disk 61 to rotate. The gear disk 61 drives the bottom gear ring 63 to rotate in the opposite direction to the main shaft 44 through the intermediate gear 62. The bottom gear ring 63 drives the wiping member 64 to rotate in the opposite direction to the main shaft 44. At this time, the wiping member 64 rotates in the opposite direction to the eccentric stirring mechanism 4, forming convection in the opposite direction to the rotation of the eccentric stirring mechanism 4. This convection helps to break the static layer of the liquid, improve the fluidity of the liquid, and further enhance the mixing effect.

[0039] Furthermore, the wiping component 64 wipes the inner wall of the tank 1. The main function of the wiping component 64 in wiping the inner wall of the tank 1 is to improve the homogenization effect. First, wiping can remove deposits and crystals on the inner wall, preventing these residues from affecting the mixing of the liquid, avoiding local oversaturation or undersaturation, and ensuring that the liquid state in the entire tank is uniform. In addition, the wiping component can promote the circulation of the liquid during its movement, thereby further improving the mixing efficiency, ensuring the consistency of temperature and concentration, and ultimately optimizing the crystallization process and improving the quality and consistency of the product.

[0040] Furthermore, the top gear 65 on the top of the wiping component 64 meshes with the top gear ring 66, causing the top gear 65 to rotate while simultaneously rotating on its own axis. This design allows the wiping component 64 to not only move linearly but also rotate while wiping the inner wall of the tank 1, thus achieving a more comprehensive cleaning effect. First, the rotation ensures that the wiping component covers a wider area when in contact with the inner wall, effectively removing residues and deposits and improving cleaning efficiency. In addition, the rotation motion enhances the interaction between the wiping component 64 and the liquid, promoting liquid flow and further improving homogenization. This ensures that the liquid state remains uniform during the crystallization process, thereby further optimizing the quality and purity of the final product.

[0041] In summary, when using this itaconic acid concentration and crystallization device, open the lid 2 on the top of the tank 1, pour the raw material to be concentrated and crystallized into the tank 1, and then turn on the drive motor 41. The drive motor 41 drives the intermittent gear 42 to rotate. When the toothed part of the intermittent gear 42 meshes with the planetary gear 43, it drives the planetary gear 43 to rotate. When the toothless part of the intermittent gear 42 rotates to one side of the planetary gear 43, the planetary gear 43 is no longer driven. When the planetary gear 43 rotates, it drives the main shaft 44 to rotate. The main shaft 44 drives the first rotating plate 45, the second rotating plate 46, and the connecting block 47 to rotate. Under the action of centrifugal force, the connecting block 47 drives the spring 48 to stretch. At this time, the first rotating plate 45 and the second rotating plate 46 rotate relative to each other to a large intersection angle, and the connecting block 48... 7 moves away from the main shaft 44. When the planetary gear 43 stops rotating, the spring 48 drives the connecting block 47 back to its original position, causing the first rotating plate 45 and the second rotating plate 46 to rotate relative to each other to a smaller intersection angle. This allows the first rotating plate 45, the second rotating plate 46, and the connecting block 47 to reciprocate simultaneously during the stirring process, achieving efficient mixing and homogenization of the liquid. The reciprocating motion can break the laminar flow state of the liquid, enhance the flow between liquids of different temperatures and concentrations, promote the uniform precipitation of crystals, and avoid local oversaturation or undersaturation. In addition, this motion can also improve heat exchange efficiency, ensure uniform temperature distribution during crystallization, thereby optimizing product quality and improving crystallization efficiency, and improving the overall working performance and production efficiency of the equipment.

[0042] Furthermore, the stirring section is positioned eccentrically. This eccentric design breaks the symmetrical flow pattern, generating uneven flow and turbulence. This effectively promotes the rapid mixing of liquids with different concentrations and temperatures, reducing local oversaturation or undersaturation. In addition, the eccentric position also improves the power efficiency of the stirring mechanism. The eccentric design makes the flow path generated by the stirring blades more complex during movement, increasing the intensity of liquid turbulence and thus improving the overall mixing efficiency. This ensures uniform distribution of liquid within the tank, optimizes heat exchange, and improves the overall efficiency of the crystallization process, thereby enhancing product quality and consistency.

[0043] At this time, the main shaft 44 drives the lower gear ring 53 to rotate, the lower gear ring 53 drives the transmission gear 52 to rotate, the transmission gear 52 drives the upper gear ring 54 to rotate in the opposite direction to the lower gear ring 53, the upper gear ring 54 drives the impeller 55 to rotate, and the impeller 55 drives the liquid at the top to flow to the eccentric stirring mechanism 4 at the bottom, which increases the exchange of liquid between the upper and lower parts, enhances the mixing and homogeneity of the liquid, promotes the effective combination of liquids with different temperatures and concentrations, prevents the occurrence of stratification, improves the solute dissolution rate during the crystallization process, and ensures the uniformity and quality of the product. In addition, this exchange of liquid between the upper and lower parts can also improve the heat exchange efficiency, ensure the uniform temperature distribution in the system, and thus optimize the overall crystallization effect.

[0044] At the same time, the main shaft 44 drives the gear disk 61 to rotate. The gear disk 61 drives the bottom gear ring 63 to rotate in the opposite direction to the main shaft 44 through the intermediate gear 62. The bottom gear ring 63 drives the wiping component 64 to rotate in the opposite direction to the main shaft 44. At this time, the wiping component 64 rotates in the opposite direction to the eccentric stirring mechanism 4, forming convection in the opposite direction to the rotation of the eccentric stirring mechanism 4. This convection helps to break the static layer of the liquid, improve the fluidity of the liquid, and further enhance the mixing effect.

[0045] Furthermore, the wiping component 64 wipes the inner wall of the tank 1. The main function of the wiping component 64 in wiping the inner wall of the tank 1 is to improve the homogenization effect. First, wiping can remove deposits and crystals on the inner wall, preventing these residues from affecting the mixing of the liquid, avoiding local oversaturation or undersaturation, and ensuring that the liquid state in the entire tank is uniform. In addition, the wiping component can promote the circulation of the liquid during its movement, thereby further improving the mixing efficiency, ensuring the consistency of temperature and concentration, and ultimately optimizing the crystallization process and improving the quality and consistency of the product.

[0046] Furthermore, the top gear 65 on the top of the wiping component 64 meshes with the top gear ring 66, causing the top gear 65 to rotate while simultaneously rotating on its own axis. This design allows the wiping component 64 to not only move linearly but also rotate while wiping the inner wall of the tank 1, thus achieving a more comprehensive cleaning effect. First, the rotation ensures that the wiping component covers a wider area when in contact with the inner wall, effectively removing residues and deposits and improving cleaning efficiency. In addition, the rotation motion enhances the interaction between the wiping component 64 and the liquid, promoting liquid flow and further improving homogenization. This ensures that the liquid state remains uniform during the crystallization process, thereby further optimizing the quality and purity of the final product.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An itaconic acid concentration and crystallization apparatus, comprising a tank, characterized in that: The top of the tank is provided with a lid, the bottom of the tank is provided with a discharge pipe, the tank is provided with an eccentric stirring mechanism, the inner wall of the tank is provided with a reverse stirring mechanism, and the inner wall of the tank is provided with an inner wall scraping mechanism. The eccentric stirring mechanism is used to homogenize the liquid in the tank, the reverse stirring mechanism is used to exchange the liquid between the upper and lower layers in the tank, and the inner wall scraping mechanism is used to scrape the inner wall of the tank. The eccentric stirring mechanism includes a drive motor, which is fixedly connected to the bottom of the tank. An intermittent gear is fixedly connected to the output shaft of the drive motor. A planetary gear is rotatably connected to the bottom of the tank. A main shaft is fixedly connected to the top of the planetary gear. One end of a first rotating plate is hinged to the outer wall of the main shaft. One end of a second rotating plate is hinged to the other end of the first rotating plate. A connecting block is hinged to the other end of the second rotating plate. One end of a spring is fixedly connected to the outer wall of the connecting block. The other end of the spring is fixedly connected to the outer wall of the main shaft. The main shaft is eccentrically positioned, and its outer wall is rotatably connected to the inner wall of the tank. The reverse stirring mechanism includes a connecting rod, one end of which is fixedly connected to the bottom of the inner wall of the tank, and the other end of which is rotatably connected to a lower gear ring. A transmission gear is rotatably connected to the outer wall of the connecting rod, and an upper gear ring is rotatably connected to the outer wall of the connecting rod. An impeller is fixedly connected to the top of the upper gear ring. The main shaft drives the lower gear ring to rotate, the lower gear ring drives the transmission gear to rotate, the transmission gear drives the upper gear ring to rotate in the opposite direction to the lower gear ring, the upper gear ring drives the impeller to rotate, and the impeller drives the liquid at the top to flow to the eccentric stirring mechanism at the bottom. The inner wall scraping mechanism includes a gear disk, which is fixedly connected to the outer wall of the main shaft. An intermediate gear is rotatably connected to the bottom of the inner wall of the tank. A bottom gear ring is rotatably connected to the bottom of the inner wall of the tank. A wiping component is rotatably connected to the top of the bottom gear ring. A top gear is fixedly connected to the top of the wiping component. A top gear ring is fixedly connected to the top of the tank. The wiping component wipes the inner wall of the tank. The top gear on the top of the wiping component meshes with the top gear ring, causing the top gear to rotate while rotating on its own axis. The top gear drives the wiping component to rotate while rotating on its own axis. The gear disk drives the bottom gear ring to rotate in the opposite direction to the main shaft through the middle gear. The bottom gear ring drives the wiping component to rotate in the opposite direction to the main shaft. At this time, the wiping component rotates in the opposite direction to the eccentric stirring mechanism.

2. The itaconic acid concentration and crystallization apparatus according to claim 1, characterized in that: The surface portion of the intermittent gear has no teeth, and there are two sets of the first rotating plate and the second rotating plate, which are arranged symmetrically.

3. The itaconic acid concentration and crystallization apparatus according to claim 1, characterized in that: The top of the lower gear ring is provided with an annular gear ring, and the outer wall of the transmission gear meshes with the annular gear ring of the lower gear ring.

4. The itaconic acid concentration and crystallization apparatus according to claim 3, characterized in that: The bottom of the upper gear ring is provided with an annular gear ring, which meshes with the transmission gear.

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