A continuous crystallization device for preparing sodium 2B acid

Abstract

This invention relates to the field of crystallization technology, specifically disclosing a continuous crystallization apparatus for the preparation of sodium 2B, comprising a tank body, a guide pipe fixedly connected to the tank body via a limiting plate, a first power component fixedly connected to the top of the tank body, a first rotating shaft rotatably connected to the first power component, the first rotating shaft being equipped with a turbine, and uniformly distributed first and second liquid guide pipes fixedly connected to the tank body, the first and second liquid guide pipes being used to transport refrigerant, and both uniformly distributed first and second liquid guide pipes being connected to an inlet pipe and a outlet pipe. This invention utilizes the method of guiding a saturated solution at a uniform speed through the refrigerant area, causing crystals to precipitate uniformly within the saturated solution. Simultaneously, the precipitated crystals flow away from the refrigerant area with the saturated solution, facilitating further crystal precipitation in subsequent saturated solutions and improving crystal precipitation efficiency.

Description

Technical Field

[0001] This invention relates to the field of crystallization technology, and more particularly to a continuous crystallization apparatus for the preparation of sodium 2B. Background Technology

[0002] Crystallization is a method for purifying specific substances from a saturated solution. It is widely used in the food, pharmaceutical, and chemical industries. There are various existing crystallization methods, including evaporation crystallization, cooling crystallization, and vacuum crystallization.

[0003] In the preparation of sodium 2-B, seed crystals need to be added to the saturated sodium 2-B solution (at this time, the solution temperature is about 80-85℃; adding seed crystals controls the direction and morphology of crystal growth, resulting in a more uniform particle size distribution of sodium 2-B). Then, the saturated sodium 2-B solution is purified by cooling crystallization. However, during this process, due to the influence of heat exchange efficiency, the temperature of the saturated sodium 2-B solution near the refrigeration equipment in the reaction vessel decreases faster, causing a large amount of sodium 2-B crystals to precipitate. Meanwhile, the temperature of the saturated sodium 2-B solution near the middle of the reaction vessel decreases more slowly, resulting in a slower precipitation efficiency of sodium 2-B crystals in the middle saturated sodium 2-B solution. At the same time, the precipitated crystals adhere to the inner wall of the reaction vessel, increasing the heat exchange distance between the refrigeration equipment and the saturated sodium 2-B solution in the reaction vessel, affecting the crystallization efficiency, and thus affecting the preparation efficiency of sodium 2-B. Summary of the Invention

[0004] To overcome the problems in the background art described above, the present invention provides a continuous crystallization apparatus for the preparation of sodium 2B acid.

[0005] The technical implementation of this invention is as follows: A continuous crystallization apparatus for preparing sodium 2B acid includes a tank body, a control terminal installed on the side wall of the tank body, an injection pipe and a discharge pipe respectively connected to the upper and lower parts of the tank body, circumferentially equidistant limiting plates fixedly connected inside the tank body, a guide pipe fixedly connected between the circumferentially equidistant limiting plates, the center line of the guide pipe coinciding with the center line of the tank body, a limiting sleeve fixedly connected to the guide pipe, a first power component electrically connected to the control terminal fixedly connected to the top of the tank body, and the tank body rotatably configured with a first power component connected to the control terminal. A first rotating shaft connected to a power component is provided with a turbine in the portion of the first rotating shaft located inside the guide pipe. A first liquid guide pipe and a second liquid guide pipe are uniformly distributed and fixedly connected inside the tank. The uniformly distributed first liquid guide pipe and the uniformly distributed second liquid guide pipe are staggered and both the first liquid guide pipe and the second liquid guide pipe penetrate the limiting plate and are fixedly connected to it. The first liquid guide pipe and the second liquid guide pipe are used to transport refrigerant. The uniformly distributed first liquid guide pipe and the uniformly distributed second liquid guide pipe are both connected to an inlet pipe and an outlet pipe.

[0006] More preferably, both the first liquid guide tube and the second liquid guide tube are composed of multiple concentric annular tubes and circumferentially equidistant straight tubes, and the annular tubes on the first liquid guide tube and the annular tubes on the second liquid guide tube are staggered. The liquid inlet tube is provided with a solenoid valve that is electrically connected to the control terminal.

[0007] More preferably, it also includes a dispersing and filling mechanism for uniformly adding seed crystals into the tank. The dispersing and filling mechanism is disposed on the upper part of the tank. The top of the tank is provided with two sets of arc-shaped grooves. Each set of arc-shaped grooves on the tank includes a plurality of circumferentially equidistantly distributed grooves. The dispersing and filling mechanism includes circumferentially equidistantly distributed first guide shells. The circumferentially equidistantly distributed first guide shells are respectively slidably disposed in adjacent arc-shaped grooves on the tank. The circumferentially equidistantly distributed first guide shells and the circumferentially equidistantly distributed limiting plates are staggered. The first material guide shell is connected to a storage shell at one end away from the tank body. A conical shell is fixed to one end of the guide pipe away from the first material guide shell. The conical shell is provided with evenly distributed inclined holes. The first material guide shells, which are circumferentially equidistantly distributed, are together provided with a uniform speed discharge component for controlling the uniform falling of the seed crystals. The tank body is provided with a swing component for the circumferentially equidistantly distributed first material guide shells to swing back and forth. The first material guide shells, which are circumferentially equidistantly distributed, are together provided with a cleaning component for cleaning the first liquid guide pipe and the second liquid guide pipe.

[0008] More preferably, the inclined hole gradually moves away from the guide tube from the inlet to the outlet, and the inclined hole is used to reduce the blockage of crystals at this position.

[0009] More preferably, the uniform discharge assembly includes circumferentially equidistant first augers, which are rotatably disposed within adjacent first guide shells. The auger blades on the first augers are symmetrically distributed. A first rotating frame is rotatably disposed within the first guide shell, and the first rotating frame is provided with circumferentially equidistant grooves. The first rotating frame is located below adjacent first augers. A protective shell is fixed to one end of the first guide shell near the first rotating shaft. Both the first augers and the first rotating frame penetrate the adjacent protective shells and are rotatably connected to them. The first auger and the adjacent first rotating frame are driven by pulleys and belts. The protective shell is rotatably provided with a second rotating shaft. The second rotating shaft is driven by a bevel gear set to the adjacent first auger. The second rotating shaft slides in an adjacent arc-shaped groove on the tank body. Two spur gears are installed on one end of the second rotating shaft outside the tank body through two one-way bearings. The one-way rotation directions of the two one-way bearings on the same second rotating shaft are opposite. The tank body is fixed with two gear rings, which are divided into internal gears and external gears. The gear rings mesh with the adjacent spur gears.

[0010] More preferably, the diameter of the pulley on the first rotating frame is larger than the diameter of the pulley on the adjacent first auger, in order to control the speed difference between the first rotating frame and the adjacent first auger.

[0011] More preferably, the swing assembly includes a support frame fixed to the side wall of the tank. The support frame is rotatably mounted on a third rotating shaft, which is connected to the first rotating shaft via a sprocket and a chain. The third rotating shaft is fixedly mounted on a first rotating disk, and a protruding post is provided at the eccentric position of the first rotating disk. A fixing frame is fixedly mounted to the side wall of the tank, and a sliding frame is provided in a limiting sliding manner on the fixing frame. The protruding post of the first rotating disk is slidably engaged with the sliding frame. A second rotating disk is rotatably mounted on the top of the tank. The first guide shells, which are circumferentially equidistant, are fixedly mounted to the second rotating disk. A protruding post is provided at the eccentric position of the second rotating disk, and the protruding post of the second rotating disk is slidably engaged with the sliding frame.

[0012] More preferably, the cleaning assembly includes a fixing ring, which is rotatably disposed in the tank body. The first guide shells, which are circumferentially equidistant, are all fixedly connected to the fixing ring. The fixing ring is fixedly connected to scrapers that are circumferentially equidistant. The first liquid guide tubes and the second liquid guide tubes, which are evenly distributed, are slidably engaged with the scrapers. The scrapers are provided with evenly distributed through holes.

[0013] More preferably, it further includes a flow guiding mechanism for guiding the crystals to accumulate between the flow guide tube and the limiting sleeve. The flow guiding mechanism is disposed at the lower end of the first rotating shaft, which penetrates the conical shell and is rotatably connected to it. The flow guiding mechanism includes a second rotating frame, which is fixed to the lower end of the first rotating shaft and contacts the lower surface of the conical shell. The second rotating frame is fixed with circumferentially equidistant first inclined plates. The circumferentially equidistant first inclined plates are jointly fixed with a fixed sleeve. The fixed sleeve is slidably provided with a sliding sleeve, which contacts the limiting sleeve. The lower part of the sliding sleeve is truncated cone-shaped, and the truncated cone part of the sliding sleeve is provided with uniformly distributed inclined holes. The sliding sleeve is equipped with an air bladder. The side of the fixed sleeve near the limiting sleeve is fixed with circumferentially equidistant second inclined plates. The limiting sleeve is provided with a discharge assembly for guiding the crystals to discharge.

[0014] More preferably, the discharge assembly includes a second guide shell, which is fixedly connected to the side wall of the limiting sleeve and penetrates the tank body and is fixedly connected thereto. The limiting sleeve is provided with a circular hole communicating with the second guide shell. A second power component electrically connected to the control terminal is installed at one end of the second guide shell located outside the tank body. A second auger connected to the second power component is rotatably provided on the second guide shell. A fixing plate is fixedly connected to the side of the second guide shell away from the second power component. The fixing plate is provided with a fan-shaped hole. A rotating plate that contacts and cooperates with the fixing plate is fixedly connected to the second auger. The rotating plate is provided with two symmetrical fan-shaped holes. The two fan-shaped holes on the rotating plate are used to alternately communicate with the fan-shaped holes on the fixing plate.

[0015] The present invention has the following advantages: 1. The present invention utilizes the guiding of the sodium 2B saturated solution to make the sodium 2B saturated solution in uniform contact with the refrigerant in the first and second liquid guiding tubes, thereby ensuring the uniform precipitation of sodium 2B crystals in the sodium 2B saturated solution. At the same time, due to the flow of the sodium 2B saturated solution, the precipitated crystals move away from the first and second liquid guiding tubes, which facilitates the uniform precipitation of sodium 2B crystals in the subsequent sodium 2B saturated solution, thereby improving the crystal precipitation efficiency.

[0016] 2. By uniformly adding seed crystals to the saturated sodium 2B solution in the circulating process, the seed crystals flow together with the saturated sodium 2B solution, which reduces the amount of sodium 2B crystals adhering to the inner wall of the tank. At the same time, the uniformly distributed seed crystals facilitate the uniform precipitation of crystals with basically the same shape and size in the saturated sodium 2B solution, thereby improving the crystallization effect and crystallization efficiency.

[0017] 3. The crystals are driven by the second rotating frame and the first inclined plate to gather between the guide tube and the limiting sleeve, which facilitates the uniform contact of the sodium 2B saturated solution with the refrigerant in the first and second guide tubes, thereby further improving the crystallization efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal components of the tank body of the present invention;

[0020] Figure 3 This is a schematic diagram of the components at the first and second liquid guide tubes of the present invention.

[0021] Figure 4 This is a cross-sectional view of the components at the flow guide tube and the limiting sleeve of the present invention;

[0022] Figure 5 This is a cross-sectional view of the dispersing packing mechanism of the present invention;

[0023] Figure 6 This is a first cross-sectional view of the uniform discharge assembly of the present invention;

[0024] Figure 7 This is a second cross-sectional view of the uniform discharge assembly of the present invention;

[0025] Figure 8 This is a three-dimensional structural diagram of the cleaning component of the present invention;

[0026] Figure 9 This is a three-dimensional structural schematic diagram of the flow guiding mechanism of the present invention;

[0027] Figure 10 This is a cross-sectional view of the flow guiding mechanism of the present invention;

[0028] Figure 11 This is a cross-sectional view of the material discharge assembly of the present invention;

[0029] Figure 12 This is a three-dimensional structural diagram of the fixed plate and rotating plate of the present invention.

[0030] Meaning of the reference numerals in the diagram:

[0031] 1. Tank body; 11. Control terminal; 12. Limiting plate; 13. Guide pipe; 14. Limiting sleeve; 15. First power component; 16. First rotating shaft; 17. First liquid guide pipe; 171. Second liquid guide pipe; 18. Liquid inlet pipe; 19. Liquid outlet pipe.

[0032] 2. First feed guide shell; 21. Feed storage shell; 22. Conical shell; 23. Inclined hole;

[0033] 3. First auger; 31. First rotating frame; 32. Protective shell; 33. Second rotating shaft; 34. Spur gear; 35. Gear ring.

[0034] 4. Support frame; 41. Third rotating shaft; 42. First rotating disk; 43. Fixed frame; 44. Sliding frame; 45. Second rotating disk;

[0035] 5. Fixing ring; 51. Scraper;

[0036] 6. Second rotating frame; 61. First inclined plate; 62. Fixed sleeve; 63. Sliding sleeve; 64. Airbag; 65. Second inclined plate;

[0037] 7. Second guide shell, 71. Second power component, 72. Second auger, 73. Fixed plate, 74. Rotating plate. Detailed Implementation

[0038] References to embodiments herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments, and that both the first and second power components are drive motors.

[0039] Example 1: A continuous crystallization apparatus for the preparation of sodium 2B acid, such as Figures 1-4 As shown, the system includes a tank 1, a control terminal 11 mounted on the front side of the tank 1, an injection pipe and a discharge pipe connected to the upper and lower parts of the tank 1 respectively, a switch valve mounted on the discharge pipe, four circumferentially equidistant limiting plates 12 fixed to the inner wall of the tank 1, and a guide pipe 13 fixed between the four limiting plates 12. Both the tank 1 and the guide pipe 13 are made of heat-insulating material, the center line of the guide pipe 13 coincides with the center line of the tank 1, a limiting sleeve 14 is fixed to the lower part of the guide pipe 13, and the top of the tank 1... A first power component 15 is fixedly connected to a control terminal 11. A first rotating shaft 16 is rotatably mounted on the tank body 1. The first rotating shaft 16 is fixedly connected to the output shaft of the first power component 15. Two turbines are arranged at the lower part of the first rotating shaft 16. Two evenly distributed first liquid guide pipes 17 and two evenly distributed second liquid guide pipes 171 are fixedly connected inside the tank body 1. The two first liquid guide pipes 17 and the two second liquid guide pipes 171 are staggered, and the first liquid guide pipes 17 and the second liquid guide pipes 171 are... Both the first liquid guide tube 17 and the second liquid guide tube 171 are connected to the limiting plate 12. Each tube consists of multiple concentric annular tubes and four circumferentially spaced straight tubes. The annular tubes on the first liquid guide tube 17 and the second liquid guide tube 171 are staggered. The first and second liquid guide tubes 17 and 171 are used to transport refrigerant. Two straight tubes symmetrically arranged on the left and right sides of each of the two first liquid guide tubes 17 and two second liquid guide tubes 171 are connected to an inlet pipe 18. Two straight pipes symmetrically arranged in the two second liquid guide pipes 171 are connected to a drain pipe 19. Both the inlet pipe 18 and the drain pipe 19 are three-way pipes. A solenoid valve is installed on the inlet pipe 18. The solenoid valve is electrically connected to the control terminal 11. By using the restriction of the guide pipe 13 and cooperating with the first rotating shaft 16 to drive the turbine to rotate, the sodium 2B saturated solution passes through the first liquid guide pipe 17 and the second liquid guide pipe 171 at a uniform speed, thereby achieving uniform cooling of the sodium 2B saturated solution and causing sodium 2B crystals to precipitate uniformly.

[0040] When preparing sodium 2B using this device, the operator adds the mixed saturated sodium 2B solution into the tank 1 through the filling pipe, so that the liquid level of the saturated sodium 2B solution is higher than the upper surface of the guide pipe 13. Then, the saturated sodium 2B solution is crystallized. At this time, the operator starts the first power unit 15 through the control terminal 11. The first power unit 15 drives the first rotating shaft 16 and the turbine on it to rotate. The rotation of the turbine agitates the liquid in the tank 1 for internal circulation, so that the saturated sodium 2B solution flows from the upper part of the guide pipe 13 to between it and the tank 1. Then, the saturated sodium 2B solution enters the lower part of the guide pipe 13 through the limiting sleeve 14, completing the internal circulation of the saturated sodium 2B solution.

[0041] During the circulation of the sodium 2-B saturated solution within tank 1, the operator simultaneously adds an appropriate amount of seed crystals to tank 1. This facilitates the maintenance of specific growth directions and morphologies of the crystals in the subsequent sodium 2-B saturated solution, thereby improving the purity and consistency of the product. During this process, the precipitated crystals move along with the flow of the sodium 2-B saturated solution within tank 1. The sodium 2-B saturated solution carries the seed crystals into the space between the guide pipe 13 and tank 1. At this point, the four limiting plates 12 prevent the sodium 2-B saturated solution from flowing smoothly downwards between the guide pipe 13 and tank 1. When the sodium 2-B saturated solution flows through the first guide pipe 17 and the second guide pipe 171, it is limited by the first guide pipe 17 and the second guide pipe 171, causing the sodium 2-B saturated solution to flow in a wave-like pattern. Simultaneously, the limiting effect of the first guide pipe 17 and the second guide pipe 171 ensures that the seed crystals are uniformly dispersed in the sodium 2-B saturated solution.

[0042] After the first power unit 15 has been operating for a period of time, the control terminal 11 starts the existing condensing equipment. Simultaneously, the condensed cold water from the condensing equipment enters the two first guide pipes 17 and the two second guide pipes 171 through four inlet pipes 18. Subsequently, the cold water returns to the existing condensing equipment through four drain pipes 19. During this process, the operator adjusts the opening and closing of the solenoid valves on the four inlet pipes 18 via the control terminal 11 to control the flow rate of the cold water within the four inlet pipes 18, thereby controlling the flow rate of the cold water in the first guide pipes 17 and the second guide pipes 171 and the flow rate of the cold water passing near them. The heat exchange efficiency of the sodium 2-B saturated solution is achieved by controlling the flow rate of cold water through the control terminal 11, so that the flow rate of cold water in the two first liquid guide pipes 17 and the two second liquid guide pipes 171 decreases sequentially from top to bottom. At this time, the slower-flowing cold water at the bottom fully exchanges heat with the passing sodium 2-B saturated solution, thereby achieving uniform cooling of the sodium 2-B saturated solution. Subsequently, under the cooling effect, sodium 2-B precipitates around the seed crystal and forms crystals. The control of the cooling rate of the sodium 2-B saturated solution during this process makes it easy to control the size and shape of the precipitated crystals.

[0043] In the crystallization process described above, the circulating flow of the sodium 2-B saturated solution facilitates continuous and uniform cooling of the sodium 2-B saturated solution, thereby improving the crystallization efficiency of sodium 2-B to a certain extent. Simultaneously, the regulation of the cold water flow rate within the four inlet pipes 18 during this process facilitates uniform cooling of the sodium 2-B saturated solution, thus achieving uniform precipitation of sodium 2-B and controlling the shape of the precipitated crystals to a certain extent. The gradual change in the cold water flow rate within the four inlet pipes 18 is merely one method and is not a limitation of the invention. This invention utilizes the control terminal 11 to program different solenoid valves on the four inlet pipes 18, enabling the crystallization operation of different types of saturated solutions. Furthermore, the temperature of the liquid flowing within the inlet pipes 18 can be adjusted by the operator according to the properties of the precipitated substance.

[0044] After circulating cold water for a period of time, the crystallization operation of the saturated sodium 2B solution is completed. The operator shuts down the existing condensation equipment and the first power unit 15 through the control terminal 11. Subsequently, the operator opens the switch valve of the discharge pipe on the tank 1 to discharge the mother liquor and sodium 2B crystals together into another container. The sodium 2B crystals are then subjected to processing steps such as filtration, washing and drying.

[0045] Example 2: Based on Example 1, such as Figures 4-7 As shown, it also includes a dispersing and filling mechanism, which is located at the upper part of the tank body 1. The dispersing and filling mechanism is used to uniformly add seed crystals into the tank body 1. The top of the tank body 1 is provided with two sets of arc-shaped grooves, each set of arc-shaped grooves containing four circumferentially equidistantly distributed grooves. The dispersing and filling mechanism includes four circumferentially equidistantly distributed first guide shells 2. The four first guide shells 2 are slidably disposed in adjacent arc-shaped grooves on the tank body 1. The four first guide shells 2 are staggered with four limiting plates 12. The lower part of the first guide shell 2 is provided with an approximately figure-eight shaped chamber. The upper end of the first guide shell 2 is connected to a storage shell 21 and a guide pipe. A conical shell 22 is fixed to the lower end of 13. The conical shell 22 is provided with evenly distributed inclined holes 23. The inclined holes 23 are inclined downward from the liquid inlet to the liquid outlet. The inclined holes 23 are used to reduce the blockage of crystals at this position. The four first guide shells 2 are together provided with a uniform discharge assembly for controlling the uniform falling of the seed crystals. The tank body 1 is provided with a swing assembly for the four first guide shells 2 to swing back and forth. The four first guide shells 2 are together provided with a cleaning assembly for cleaning the first liquid guide tube 17 and the second liquid guide tube 171. By using the conical shell 22 to restrict the crystals, it is easy for all crystals in the saturated solution to precipitate out.

[0046] like Figure 6 and Figure 7As shown, the uniform discharge assembly includes four circumferentially equidistant first augers 3, which are rotatably mounted within adjacent first guide shells 2. The auger blades on the first augers 3 are symmetrically distributed. A first rotating frame 31 is rotatably mounted within the first guide shell 2, located below the adjacent first augers 3. The first rotating frame 31 has four circumferentially equidistant grooves. A protective shell 32 is fixedly connected to one end of the first guide shell 2 near the first rotating shaft 16. Both the first augers 3 and the first rotating frame 31 penetrate the adjacent protective shell 32 and are rotatably connected to it. The first augers 3 and the adjacent first rotating frame 31 are driven by pulleys and belts, which are located within the adjacent protective shells 32. The diameter of the pulley on the first rotating frame 31 is larger than the diameter of the pulley on the adjacent first auger 3, used to control the first rotating frame 31. Due to the speed difference between the first auger 3 and the adjacent first auger 3, a second rotating shaft 33 is rotatably mounted on the upper part of the protective shell 32. The second rotating shaft 33 is driven by a bevel gear set to the adjacent first auger 3. The bevel gear set is located inside the adjacent protective shell 32. The second rotating shaft 33 slides in an adjacent arc-shaped groove on the tank body 1. Two spur gears 34 are mounted on the upper part of the second rotating shaft 33 through two one-way bearings. The one-way rotation directions of the two one-way bearings on the same second rotating shaft 33 are opposite. Two gear rings 35 are fixed to the tank body 1. The two gear rings 35 are divided into internal gears and external gears. The gear rings 35 mesh with the adjacent spur gears 34. The rotation of the first auger 3 makes the seed crystals fill the grooves of the adjacent first rotating frame 31. Then the first rotating frame 31 rotates and evenly sprinkles the seed crystals in its grooves into the saturated solution in the tank body 1, which facilitates the uniform precipitation of crystals in the saturated solution.

[0047] like Figure 5 As shown, the swing assembly includes a support frame 4, which is fixed to the upper right side of the tank body 1. A third rotating shaft 41 is rotatably mounted on the support frame 4. The upper end of the third rotating shaft 41 is connected to the upper end of the first rotating shaft 16 via a sprocket and chain drive. A first rotating disk 42 is fixedly mounted to the lower end of the third rotating shaft 41. A protruding post is provided at the eccentric position of the lower surface of the first rotating disk 42. A fixing frame 43 is fixedly mounted on the upper right side wall of the tank body 1. A sliding frame 44 is provided in a limited sliding manner on the fixing frame 43. The sliding frame 44 has two symmetrical sliding grooves. The protrusion of the rotating disk 42 slides in the groove on the right side of the sliding frame 44. The top of the tank 1 is rotatably equipped with a second rotating disk 45. The four first material guide shells 2 are all fixedly connected to the second rotating disk 45. A protrusion is provided at the eccentric part of the upper surface of the second rotating disk 45. The protrusion of the second rotating disk 45 slides in the groove on the left side of the sliding frame 44. By reciprocating the rotation of the second rotating disk 45, the four first material guide shells 2 evenly sprinkle the seed crystals into the saturated solution, so that the crystal shape precipitated in the saturated solution remains basically consistent and the quality of the precipitated crystals is improved.

[0048] like Figure 2 and Figure 8As shown, the cleaning assembly includes a fixing ring 5, which is rotatably mounted on the upper part of the tank body 1. All four first guide shells 2 are fixedly connected to the fixing ring 5. The fixing ring 5 is fixedly connected to four scrapers 51 that are circumferentially equidistant. The scrapers 51 are approximately T-shaped. The two first liquid guide pipes 17 and the two second liquid guide pipes 171 are slidably engaged with the scrapers 51. The scrapers 51 are provided with uniformly distributed through holes. The movement of the scrapers 51 is used to clean the first liquid guide pipes 17 and the second liquid guide pipes 171, which facilitates stable heat exchange between the cold water and the saturated solution in the first liquid guide pipes 17 and the second liquid guide pipes 171, thereby ensuring uniform cooling of the saturated solution.

[0049] After the sodium 2-B saturated solution is added to tank 1 (at this time, the liquid level of the sodium 2-B saturated solution is lower than the lower surface of the first guide shell 2 and higher than the upper surface of the guide pipe 13), the operator adds the required seed crystals evenly into the four first guide shells 2. Then, the operator starts the first power unit 15 and the existing condensation equipment through the control terminal 11. The first power unit 15 drives the first rotating shaft 16 to rotate and repeat the above operation, so that the sodium 2-B saturated solution circulates internally in tank 1. The existing condensation equipment works to make cold water flow in the two first liquid guide pipes 17 and the two second liquid guide pipes 171, so as to uniformly cool the circulating sodium 2-B saturated solution, which is conducive to the uniform precipitation of sodium 2-B crystals.

[0050] The rotation of the first rotating shaft 16 drives the third rotating shaft 41 and the first rotating disk 42 to rotate via pulleys and belts. The rotation of the first rotating disk 42 causes its upper protrusions to press against the sliding frame 44, causing it to move back and forth. The sliding frame 44 moves and presses against the protrusions of the second rotating disk 45, causing the second rotating disk 45 to drive the four first guide shells 2 to rotate back and forth in a reciprocating manner. The reciprocating rotation of the first guide shells 2 facilitates the uniform distribution of seed crystals in the sodium 2B saturated solution. At the same time, the second rotating disk 45 drives the four second rotating shafts 33 to swing back and forth in a reciprocating manner. At this time, it is subjected to the meshing action of two gear rings 35 and adjacent spur gears 34 (since the two gear rings 35 are divided into internal gears and external gears, the meshing sides of the two adjacent spur gears 34 and the adjacent gear rings 35 are opposite). Furthermore, with the guiding effect of the one-way bearings of the two spur gears 34 on the same second rotating shaft 33, the four second rotating shafts 33 will continuously rotate during the reciprocating forward and reverse oscillation process. The rotation of the second rotating shafts 33 drives the adjacent first augers 3 to rotate through the adjacent bevel gear sets. The rotation of the first augers 3 causes the seed crystals in the storage shell 21 and the first guide shell 2 to uniformly fill the grooves of the adjacent first rotating frame 31. The rotation of the first augers 3 drives the adjacent first rotating frame 31 to rotate through the pulleys and belts. The rotation of the first rotating frame 31 causes the seed crystals in the grooves to fall downwards at a uniform speed. The fallen seed crystals fall into the sodium 2B saturated solution between the guide pipe 13 and the tank 1, and the seed crystals are evenly distributed in the sodium 2B saturated solution.

[0051] When the sodium 2-benzene saturated solution carrying uniformly distributed seed crystals passes through the first liquid guide tube 17 and the second liquid guide tube 171, the existing condenser continues to operate, cooling and crystallizing the sodium 2-benzene saturated solution passing through this section, further improving the crystallization efficiency of sodium 2-benzene. Subsequently, the sodium 2-benzene crystals flow with the sodium 2-benzene saturated solution to the lower part of the guide tube 13. At this time, under the guidance of the conical shell 22, a large amount of sodium 2-benzene crystals accumulate between the guide tube 13 and the limiting sleeve 14. Then, the sodium 2-benzene saturated solution returns to the guide tube 13 through the inclined hole 23. The above process is repeated to continuously cool and crystallize the sodium 2-benzene saturated solution, facilitating sufficient crystallization and indirectly improving the crystallization efficiency. During this process, the conical shell 22 intercepts the sodium 2-benzene crystals, facilitating sufficient heat exchange between the sodium 2-benzene saturated solution and the cold water in the first liquid guide tube 17 and the second liquid guide tube 171. The above operation is repeated to crystallize sodium 2-benzene.

[0052] During the crystallization process described above, the operator controls the flow rate of cold water in the first liquid guide tube 17 and the second liquid guide tube 171 through the control terminal 11. After the flow rate of cold water in the first liquid guide tube 17 and the second liquid guide tube 171 remains stable for a period of time, the flow rate of cold water in the first liquid guide tube 17 and the second liquid guide tube 171 gradually increases. At this time, the increased flow rate of cold water in the first liquid guide tube 17 and the second liquid guide tube 171 will further uniformly cool the sodium 2B saturated solution that has precipitated some crystals again, thereby further improving the crystallization efficiency of sodium 2B saturated solution.

[0053] When the four first guide shells 2 reciprocate in both directions, the four first guide shells 2 drive the four scrapers 51 to reciprocate in both directions through the fixing ring 5. When the scrapers 51 rotate, they scrape the first liquid guide tube 17 and the second liquid guide tube 171, so that the cold water in the first liquid guide tube 17 and the second liquid guide tube 171 can fully and stably exchange heat with the sodium 2B saturated solution, ensuring that the sodium 2B saturated solution cools down at a stable rate, thereby maintaining the stability of the seed crystal efficiency.

[0054] Example 3: Based on Example 2, such as Figure 9 and Figure 10As shown, it also includes a flow guiding mechanism, which is located at the lower end of the first rotating shaft 16. The flow guiding mechanism is used to guide the crystals to accumulate between the flow guiding tube 13 and the limiting sleeve 14. The first rotating shaft 16 penetrates the conical shell 22 and is rotatably connected to it. The flow guiding mechanism includes a second rotating frame 6, which is fixed to the lower end of the first rotating shaft 16 and contacts the lower surface of the conical shell 22. Four first inclined plates 61 are circumferentially equidistantly distributed on the upper part of the second rotating frame 6. The four first inclined plates 61 are jointly fixed to a fixing sleeve 62. The center line of the fixing sleeve 62 coincides with the center line of the limiting sleeve 14. The inner side of the fixing sleeve 62 is limited by a sliding device. A sliding sleeve 63 is provided, which contacts and engages with a limiting sleeve 14. The lower part of the sliding sleeve 63 is shaped like a frustum, and the frustum-shaped part of the sliding sleeve 63 is provided with evenly distributed inclined holes. An air bladder 64 is installed on the sliding sleeve 63. Four second inclined plates 65 are circumferentially and equidistantly distributed on the outer side of the fixed sleeve 62. A discharge component for guiding the crystals out is provided on the limiting sleeve 14. After the saturated solution exceeds the upper surface of the sliding sleeve 63, the sliding sleeve 63 moves to contact the limiting sleeve 14. Then, under the stirring action of the first inclined plate 61, the crystals are stored between the fixed sleeve 62 and the limiting sleeve 14, which facilitates the subsequent removal of the crystals and improves the overall preparation efficiency.

[0055] like Figure 9 , Figure 11 and Figure 12 As shown, the discharge assembly includes a second guide shell 7, which is fixedly connected to the right side wall of the limiting sleeve 14 and penetrates the tank body 1 and is fixedly connected thereto. The limiting sleeve 14 is provided with a round hole that communicates with the second guide shell 7. A second power component 71 is installed on the right side of the second guide shell 7 and is electrically connected to the control terminal 11. A second auger 72 is rotatably installed inside the second guide shell 7, and the output shaft of the second power component 71 is fixedly connected to the second auger 72. A fixed plate 73 is fixedly connected inside the feed guide shell 7. A fan-shaped hole is provided at the lower part of the fixed plate 73. A rotating plate 74 is fixedly connected to the left end of the second auger 72. The rotating plate 74 is in contact with the fixed plate 73. The rotating plate 74 is provided with two fan-shaped holes symmetrically arranged. The two fan-shaped holes on the rotating plate 74 are used to alternately communicate with the fan-shaped holes on the fixed plate 73. By rotating the rotating plate 74 and the second auger 72, the precipitated crystals are taken out, which facilitates the subsequent processing of the precipitated crystals and improves the preparation efficiency of the crystals.

[0056] During the crystallization operation of the sodium 2B saturated solution, as the sodium 2B saturated solution is added into the tank 1, the airbag 64 is buoyed by the sodium 2B saturated solution, and the sliding sleeve 63 moves upward to seal the lower gap between the fixed sleeve 62 and the limiting sleeve 14. Subsequently, the control terminal 11 starts the first power component 15 and the existing condensation equipment, and then repeats the above operation. At this time, a large amount of sodium 2B crystals will accumulate between the guide pipe 13 and the limiting sleeve 14, and at this time, the fan-shaped holes on the rotating plate 74 and the fan-shaped holes on the fixed plate 73 are intersected, so that the second guide shell 7 is in a blocked state.

[0057] In the above process, the first power component 15 drives the second rotating frame 6 to rotate together via the first rotating shaft 16. The rotation of the second rotating frame 6 drives the four first inclined plates 61, the fixed sleeve 62, the sliding sleeve 63, and the four second inclined plates 65 to rotate together. The rotation of the first inclined plates 61 drives the sodium 2B crystals between the guide tube 13 and the limiting sleeve 14, causing the sodium 2B crystals to enter between the fixed sleeve 62 and the limiting sleeve 14. Subsequently, the rotation of the four second inclined plates 65 drives the sodium 2B crystals to move into the second guide shell 7. At this time, the operator controls the movement of the crystals. The control terminal 11 starts the second power component 71, which drives the second auger 72 and the rotating plate 74 to rotate at a constant speed. The rotation of the rotating plate 74 causes its two fan-shaped holes to alternately connect with the fan-shaped holes on the fixed plate 73, so that the sodium 2B crystals accumulated in the second guide shell 7 gradually enter the right side of the rotating plate 74. At this time, under the rotation of the second auger 72, the sodium 2B crystals are evenly discharged from the right side of the second guide shell 7, which facilitates the subsequent processing of the sodium 2B crystals and further improves the preparation efficiency of sodium 2B.

[0058] After a period of crystallization, the operator shuts down the first power unit 15, the existing condensation equipment, and the second power unit 71. When the second power unit 71 stops working, the fan-shaped holes on the rotating plate 74 and the fan-shaped holes on the fixed plate 73 are staggered. Subsequently, the mother liquor and the remaining crystals in the tank 1 are removed. The sodium 2B crystals are then further processed. When crystallization is performed again, the above operation is repeated to prevent clumping.

[0059] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A continuous crystallization apparatus for the preparation of sodium 2β, characterized in that, The system includes a tank (1), a control terminal (11) installed on the side wall of the tank (1), an injection pipe and a discharge pipe connected to the upper and lower parts of the tank (1), circumferentially equidistant limiting plates (12) fixed inside the tank (1), and a guide pipe (13) fixed between the circumferentially equidistant limiting plates (12). The center line of the guide pipe (13) coincides with the center line of the tank (1), and a limiting sleeve (14) is fixed to the guide pipe (13). A first power component (15) electrically connected to the control terminal (11) is fixed to the top of the tank (1). A first rotating shaft (16) connected to the first power component (15) is rotatably provided on the tank (1). A turbine is provided on the part of the shaft (16) located inside the guide pipe (13). A first liquid guide pipe (17) and a second liquid guide pipe (171) are uniformly distributed and fixedly connected inside the tank (1). The first liquid guide pipe (17) and the second liquid guide pipe (171) are staggered and both the first liquid guide pipe (17) and the second liquid guide pipe (171) penetrate the limiting plate (12) and are fixedly connected to it. The first liquid guide pipe (17) and the second liquid guide pipe (171) are used to transport refrigerant. The first liquid guide pipe (17) and the second liquid guide pipe (171) are both connected to the inlet pipe (18) and the outlet pipe (19). It also includes a dispersing and filling mechanism for uniformly adding seed crystals into the tank (1). The dispersing and filling mechanism includes a first guide shell (2) distributed circumferentially. The first guide shell (2) distributed circumferentially is provided with a uniform discharge component for controlling the uniform falling of seed crystals. The tank (1) is provided with a swinging component for the first guide shell (2) distributed circumferentially to swing back and forth. The first guide shell (2) is rotatably provided with a first rotating frame (31), the first rotating frame (31) is provided with grooves evenly distributed in the circumferential direction, the first guide shell (2) is fixedly connected to a protective shell (32) at one end near the first rotating shaft (16), the protective shell (32) is rotatably provided with a second rotating shaft (33), the second rotating shaft (33) is located outside the tank body (1) with two spur gears (34) installed through two one-way bearings, the one-way rotation directions of the two one-way bearings on the second rotating shaft (33) are opposite, the tank body (1) is fixedly connected with two gear rings (35), the two gear rings (35) are divided into internal gears and external gears, the gear rings (35) mesh with the adjacent spur gears (34); The swing assembly includes a support frame (4), which is fixed to the side wall of the tank (1). The support frame (4) is rotatably provided with a third rotating shaft (41), and the third rotating shaft (41) is fixedly connected to a first rotating disk (42). A protruding post is provided at the eccentric part of the first rotating disk (42). A fixing frame (43) is fixedly connected to the side wall of the tank (1). A sliding frame (44) is provided in a limiting sliding manner on the fixing frame (43). The protruding post of the first rotating disk (42) is slidably engaged with the sliding frame (44). A second rotating disk (45) is rotatably provided on the top of the tank (1). The first guide shell (2) is fixedly connected to the second rotating disk (45). A protruding post is provided at the eccentric part of the second rotating disk (45). The protruding post of the second rotating disk (45) is slidably engaged with the sliding frame (44).

2. The continuous crystallization apparatus for preparing sodium 2B acid according to claim 1, characterized in that, The first liquid guide tube (17) and the second liquid guide tube (171) are both composed of multiple concentric annular tubes and circumferentially distributed straight tubes. The annular tubes on the first liquid guide tube (17) and the annular tubes on the second liquid guide tube (171) are staggered. The inlet tube (18) is equipped with a solenoid valve that is electrically connected to the control terminal (11).

3. The continuous crystallization apparatus for preparing sodium 2B acid according to claim 1, characterized in that, The dispersing filler mechanism is located on the upper part of the tank (1). The top of the tank (1) is provided with two sets of arc grooves. Each set of arc grooves on the tank (1) includes multiple circumferentially equidistantly distributed arc grooves. The first guide shells (2) circumferentially equidistantly distributed arc grooves are respectively slidably disposed in adjacent arc grooves on the tank (1). The first guide shells (2) circumferentially equidistantly distributed arc grooves and the limiting plates (12) circumferentially equidistantly distributed arc grooves are staggered. The end of the first guide shell (2) away from the tank (1) is connected to the storage shell (21). The end of the guide pipe (13) away from the first guide shell (2) is fixed to a conical shell (22). The conical shell (22) is provided with uniformly distributed inclined holes (23). The first guide shells (2) circumferentially equidistantly distributed arc grooves are together provided with a cleaning component for cleaning the first liquid guide pipe (17) and the second liquid guide pipe (171).

4. The continuous crystallization apparatus for preparing sodium 2B acid according to claim 3, characterized in that, The inclined hole (23) gradually moves away from the guide tube (13) from the liquid inlet to the liquid outlet. The inclined hole (23) is used to reduce the blockage of crystals at this position.

5. A continuous crystallization apparatus for preparing sodium 2B acid according to claim 3, characterized in that, The uniform discharge assembly includes a first auger (3) circumferentially equidistantly distributed. The first augers (3) circumferentially equidistantly distributed are rotatably disposed in adjacent first guide shells (2). The auger blades on the first augers (3) are symmetrically distributed. The first rotating frame (31) is located below the adjacent first augers (3). The first augers (3) and the first rotating frame (31) both penetrate the adjacent protective shell (32) and are rotatably connected to it. The first augers (3) and the adjacent first rotating frame (31) are driven by pulleys and belts. The second rotating shaft (33) is driven by a bevel gear set to the adjacent first augers (3). The second rotating shaft (33) slides in adjacent arc grooves on the tank body (1).

6. The continuous crystallization apparatus for preparing sodium 2B acid according to claim 5, characterized in that, The diameter of the pulley on the first rotating frame (31) is larger than the diameter of the pulley on the adjacent first auger (3), which is used to control the speed difference between the first rotating frame (31) and the adjacent first auger (3).

7. A continuous crystallization apparatus for preparing sodium 2B acid according to claim 5, characterized in that, The third rotating shaft (41) is connected to the first rotating shaft (16) by a sprocket and a chain.

8. A continuous crystallization apparatus for preparing sodium 2B acid according to claim 3, characterized in that, The cleaning assembly includes a fixing ring (5), which is rotatably disposed inside the tank (1). The first guide shells (2) distributed circumferentially are fixedly connected to the fixing ring (5). The fixing ring (5) is fixedly connected to scrapers (51) distributed circumferentially. The first liquid guide tubes (17) and the second liquid guide tubes (171) are evenly distributed and slide in cooperation with the scrapers (51). The scrapers (51) are provided with evenly distributed through holes.

9. A continuous crystallization apparatus for preparing sodium 2B acid according to claim 3, characterized in that, It also includes a flow guiding mechanism for guiding crystals to accumulate between the flow guide tube (13) and the limiting sleeve (14). The flow guiding mechanism is disposed at the lower end of the first rotating shaft (16), which penetrates the conical shell (22) and is rotatably connected to it. The flow guiding mechanism includes a second rotating frame (6), which is fixed to the lower end of the first rotating shaft (16) and contacts the lower surface of the conical shell (22). The second rotating frame (6) is fixed with circumferentially equidistant first inclined plates (61). The first inclined plate (61) is fixedly connected to a fixed sleeve (62), and the fixed sleeve (62) is slidably provided with a sliding sleeve (63). The sliding sleeve (63) is in contact with the limiting sleeve (14). The lower part of the sliding sleeve (63) is set in a frustum shape, and the frustum-shaped part of the sliding sleeve (63) is provided with evenly distributed inclined holes. The sliding sleeve (63) is equipped with an airbag (64). The fixed sleeve (62) is fixedly connected to a second inclined plate (65) circumferentially distributed at equal intervals on the side near the limiting sleeve (14). The limiting sleeve (14) is provided with a discharge assembly for guiding the crystals to be discharged.

10. A continuous crystallization apparatus for preparing sodium 2B acid according to claim 9, characterized in that, The discharge assembly includes a second guide shell (7), which is fixedly connected to the side wall of the limiting sleeve (14). The second guide shell (7) penetrates the tank body (1) and is fixedly connected to it. The limiting sleeve (14) is provided with a circular hole communicating with the second guide shell (7). A second power component (71) electrically connected to the control terminal (11) is installed at one end of the second guide shell (7) outside the tank body (1). The second guide shell (7) is rotatably configured to interact with the control terminal (11). The second auger (72) is connected to the second power component (71). A fixed plate (73) is fixedly connected to the side of the second guide shell (7) away from the second power component (71). The fixed plate (73) is provided with a fan-shaped hole. The second auger (72) is fixedly connected to a rotating plate (74) that contacts and cooperates with the fixed plate (73). The rotating plate (74) is provided with two symmetrical fan-shaped holes. The two fan-shaped holes on the rotating plate (74) are used to alternately communicate with the fan-shaped holes on the fixed plate (73).

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