Double cooling decolorization and refining device and its application in the preparation of sodium citrate

Abstract

The present invention relates to the field of sodium citrate preparation, and specifically to a double-cooling decolorizing and refining device and its application in the preparation of sodium citrate, comprising a reaction tank, wherein an agitator is provided in the reaction tank, and further comprising an external cooling jacket and an external cooling coil, wherein a cooling area is formed between the external cooling jacket and the reaction tank, wherein the external cooling jacket has an air inlet and an air outlet, and the external cooling coil has a water inlet and a water outlet. The present invention detects the rotation speed of the agitator through a rotation speed sensor, and adjusts the flow regulating component according to the rotation speed signal, gradually increases the cold air flow rate and the cooling water flow rate, and as the rotation speed of the agitator increases, the opening of the air inlet and the water inlet gradually increases, thereby ensuring the continuous improvement of the cooling effect, effectively controlling the particle size of the crystal formation, and avoiding the increase in the number of crystal nuclei and the uneven crystallization caused by rapid cooling, thereby improving the purity and yield of sodium citrate.

Description

Technical Field

[0001] The invention relates to the field of sodium citrate preparation, in particular to a double cooling decolorization and refining device and application thereof in sodium citrate preparation. Background Art

[0002] In the existing preparation of sodium citrate, a sodium citrate solution is synthesized by a citric acid solution and a sodium hydroxide solution. The sodium citrate solution is decolorized, concentrated, cooled and crystallized by a decolorization and refining device to obtain sodium citrate particles. In the decolorization process, the adsorption properties of activated carbon are used to adsorb the pigments and impurities in the solution onto the surface of the activated carbon.

[0003] However, during the cooling process, the existing cooling method may cause some areas to be insufficiently cooled, while other areas are overcooled, forming a temperature gradient. The temperature fluctuates greatly during the cooling process, making it difficult to maintain a stable temperature, affecting product quality and crystallization efficiency, extending the production cycle, and reducing production efficiency.

[0004] The currently disclosed Chinese patent authorization announcement number is CN112742106B, a DMDO crystal decolorization and drying device, including a box body, a glass container, a controller is arranged on the box body, a crystallization area and a drying area are separated in the box body, a decolorization mechanism is arranged on the left side of the top of the box body, a suction filtration mechanism is arranged on the right side of the upper part of the box body, a cooling mechanism is arranged in the crystallization area, and a drying mechanism is arranged in the drying area; the decolorization mechanism includes a stirring barrel, a transmission ring, an external stirring motor, an internal stirring motor, an external driving gear, an internal driving gear, an external driven gear, an internal driven gear, a stirring rod, a stirring fan blade, a heating rod, a sealing ring, a bearing 1, a bearing 2, a bearing 3, a valve, a filter, a discharge pipe, a top cover, An inner connecting rod, an electric cylinder and a connecting plate, wherein the electric cylinder is fixed on the upper surface of the box body, the output end of the electric cylinder and the connecting plate are rotatably connected, a top cover is fixedly connected to the front end of the connecting plate, a stirring rod is rotatably provided at the middle of the top cover through a bearing 1, a plurality of stirring blades are evenly provided on the outer side of the stirring rod, the inner connecting rod rotatably penetrates the stirring rod, the upper and lower ends of the inner connecting rod and the stirring rod are rotatably connected through bearing 2, a sealing ring is provided between the inner connecting rod and the lower end of the stirring rod, a heating rod is provided at the lower end of the inner connecting rod, an inner driven gear is provided on the outer side of the upper part of the stirring rod, an inner stirring motor is fixedly provided in the top cover, an inner driving gear is fixedly connected to the output end of the inner stirring motor, and the inner driving gear and the inner driven gear are meshed and transmitted with each other.

[0005] According to the above patent, the above patent uses a dual cooling method of cold air and water cooling to quickly cool the liquid in the glass container, so that DMDO crystals can be quickly precipitated. However, rapid cooling will increase the rate of crystal nucleation and the number of crystal nuclei, thereby forming a smaller crystal size. Therefore, there is a need for a dual cooling decolorization and refining device that maintains an appropriate stirring speed, ensures uniform temperature distribution, and flexibly adjusts the cooling rate and crystallization time. Summary of the invention

[0006] In view of the problems existing in the prior art, a double-cooling decolorization and refining device is provided. The rotation speed of the agitator is detected by a rotation speed sensor, and the flow regulating component is adjusted according to the rotation speed signal to gradually increase the cold air flow and the cooling water flow. As the rotation speed of the agitator increases, the openings of the air inlet and the water inlet gradually increase, thereby ensuring the continuous improvement of the cooling effect, effectively controlling the particle size of the crystal formation, and improving the purity and yield of sodium citrate.

[0007] In order to solve the problems of the prior art, the present invention provides a double-cooling decolorization and refining device, comprising a reaction tank, wherein a stirrer is arranged in the reaction tank, the reaction tank has a feed port and a discharge port, and further comprises an external cooling jacket fixedly sleeved on the lower half of the reaction tank and an external cooling coil spirally wound on the lower half of the reaction tank and in contact with the outer wall of the reaction tank, a cooling area is formed between the external cooling jacket and the reaction tank, the external cooling coil is located in the cooling area, the external cooling jacket has an air inlet and an air outlet for circulating cooling air, and the external cooling coil has a water inlet for circulating cooling water and a water outlet, the reaction tank is provided with a flow regulating component for synchronously controlling the air inlet flow of the external cooling jacket and the water inlet flow of the external cooling coil, the flow regulating component cooperates with the air inlet of the external cooling jacket and the water inlet of the external cooling coil, the reaction tank is provided with a speed sensor for sensing the stirring speed of the agitator and a controller for controlling the flow regulating component, the speed sensor is electrically connected to the controller, when the speed of the agitator gradually increases, the opening of the air inlet of the external cooling jacket and the water inlet of the external cooling coil are in a state gradually approaching a fully open state.

[0008] Preferably, the reaction tank is also provided with an internal cooling coil spirally wound in its lower half and in direct contact with the reaction liquid, and the internal cooling coil also has a water inlet and a water outlet for cooling water circulation. The reaction tank is fixedly provided with a cooling cabin for storing cooling water to which the water inlet of the external cooling coil and the water inlet of the internal cooling coil are connected.

[0009] Preferably, the water outlet of the external cooling coil is connected with the air outlet of the external cooling jacket, and a drainage tank body connected with the water outlet of the internal cooling coil is fixedly provided in the reaction tank, and the drainage tank body has a pipe extending outward, and when the external cooling jacket and the external cooling coil are venting and draining respectively, the cold air and cooling water are in a state of being discharged outward from the air outlet on the external cooling jacket, and when the internal cooling coil is draining, the cooling water is in a state of being discharged outward from the pipe on the drainage tank body.

[0010] Preferably, the flow regulating assembly includes a first plug body arranged at the air inlet of the outer cooling jacket and a second plug body arranged at the water inlets of the outer cooling coil and the inner cooling coil, respectively, the first plug body can move relative to the air inlet, and the second plug body can move relative to the water inlet, when the first plug body and the second plug body respectively block the air inlet and the water inlet, the reaction liquid in the reaction tank is in a state of not being cooled, and when the first plug body and the second plug body respectively open the air inlet and the water inlet, the reaction liquid in the reaction tank is in a state of being cooled.

[0011] Preferably, the flow regulating assembly also includes a linear drive for synchronously controlling the movement of the first plug body and the second plug body. When the linear drive drives the first plug body and the second plug body away from the air inlet and the water inlet respectively, the air inlet and the water inlet are in a synchronous and progressive opening state, so that the reaction liquid is cooled at an appropriate speed.

[0012] Preferably, the first plug body and the second plug body are both made of rubber.

[0013] Preferably, the first plug body is a block structure, the second plug body is a conical structure, and the cooling chamber has a valve sleeve at the position corresponding to the water inlet that can fit with the second plug body. When the first plug body moves, the first plug body is in a state of moving in contact with the external cooling jacket, and the second plug body is synchronously in a state of moving relative to the valve sleeve.

[0014] Preferably, the linear drive has a lifting plate arranged in the cooling chamber and a lifting rod fixedly connected between the lifting plate and the first plug body, each second plug body is fixedly connected to the lifting plate, and the cooling chamber and the outer cooling jacket are provided with openings for the lifting rod to move. When the lifting rod moves, the first plug body and the second plug body are in a state of synchronous movement.

[0015] Preferably, the lifting plate has a plurality of guide rods extending vertically upward through the cooling chamber body and outward, and the cooling chamber body is provided with a guide opening for the guide rods to pass through, and each guide rod is sleeved with a return spring fixedly connected between the cooling chamber body and the lifting plate, and when the first plug body and the second plug body respectively close the air inlet and the water inlet, the return spring is in an uncompressed state.

[0016] The invention also provides application of a double cooling decolorization and refining device in the preparation of sodium citrate, and adopts the double cooling decolorization and refining device.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention detects the rotation speed of the agitator through a rotation speed sensor and transmits the signal to the controller. The controller adjusts the flow regulating component according to the rotation speed signal, and gradually increases the cold air flow of the external cooling jacket and the cooling water flow of the external cooling coil. As the rotation speed of the agitator increases, the opening of the air inlet and the water inlet gradually increases to ensure the continuous improvement of the cooling effect. The uniform flow of cold air and cooling water in the cooling area makes the temperature distribution in the lower half of the reaction tank more uniform, avoiding local overcooling. Achieving a cooling rate from slow to fast effectively controls the particle size of the crystals formed, avoids an increase in the number of crystal nuclei and uneven crystallization caused by rapid cooling, thereby improving the purity and yield of sodium citrate;

[0019] 2. The present invention absorbs the heat of the outer wall of the reaction tank through the cooling water of the external cooling coil and the cold air effect, thereby reducing the temperature inside the reaction tank. The cooling water of the internal cooling coil directly contacts the reaction liquid, absorbs the heat of the reaction liquid, and further reduces the temperature inside the reaction tank. This allows the cooling water to absorb the heat of the reaction liquid more efficiently, reduces the path and resistance of heat transfer, helps avoid local overcooling, and ensures a more uniform temperature distribution inside the reaction tank.

[0020] 3. The present invention synchronously controls the movement of the first plug body and the second plug body through a linear drive, so that the air inlet and the water inlet are synchronously and progressively opened, and the flow of cold air and cooling water is gradually increased, and enters and absorbs heat through the air inlet of the external cooling jacket and the water inlet of the external cooling coil and the internal cooling coil respectively. It ensures that the reaction liquid is cooled at an appropriate speed, avoids local overcooling and insufficient cooling, realizes precise control of the temperature in the reaction tank, and improves the cooling effect and reaction stability;

[0021] 4. The present invention stirs different areas in the reaction tank through the first stirring part and the second stirring part according to the positions of the external cooling jacket, the external cooling coil and the internal cooling coil, thereby increasing the uniformity of the temperature in the reaction tank, improving the heat exchange efficiency, and being able to further reduce the temperature in the reaction tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the double-cooling decolorization and refining device of the present invention;

[0023] Figure 2 This is a partial plan view of the double cooling decolorization and refining device of the present invention. Figure 1 ;

[0024] Figure 3 It is a partial three-dimensional structural cross-sectional view of the double-cooling decolorization and refining device of the present invention;

[0025] Figure 4 This is a partial plan view of the double cooling decolorization and refining device of the present invention. Figure 2 ;

[0026] Figure 5 yes Figure 4 A magnified schematic diagram of point A;

[0027] Figure 6 It is a three-dimensional structural schematic diagram of an outer cooling coil, an inner cooling coil and a flow regulating assembly of a double cooling decolorization and refining device of the present invention;

[0028] Figure 7 It is a top view of the outer cooling coil, the inner cooling coil and the flow regulating assembly of the double cooling decolorization and refining device of the present invention;

[0029] Figure 8 yes Figure 7 A three-dimensional structural cross-sectional view at BB;

[0030] Fig. 9 yes Figure 7 Plane section view at CC;

[0031] Fig.10 yes Figure 8 Enlarged schematic diagram of point D.

[0032] The numbers in the figure are: 1. reaction tank; 11. feed inlet; 12. discharge port; 2. agitator; 21. speed sensor; 3. external cooling jacket; 31. air inlet; 32. air outlet; 4. external cooling coil; 41. water inlet; 42. water outlet; 5. flow regulating assembly; 51. first plug body; 52. second plug body; 521. valve sleeve; 53. linear drive; 531. lifting plate; 5311. guide rod; 5312. reset spring; 532. lifting rod; 6. internal cooling coil; 7. cooling cabin; 8. drainage cabin; 81. pipeline. DETAILED DESCRIPTION

[0033] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] See also Figure 1-Figure 5 and Fig.10As shown, a double cooling decolorization and refining device comprises a reaction tank 1, wherein the reaction tank 1 is provided with a stirrer 2, wherein the reaction tank 1 has a feed port 11 and a discharge port 12, and further comprises an external cooling jacket 3 fixedly sleeved on the lower half of the reaction tank 1 and an external cooling coil 4 spirally wound on the lower half of the reaction tank 1 and in contact with the outer wall of the reaction tank 1, wherein a cooling area is formed between the external cooling jacket 3 and the reaction tank 1, wherein the external cooling coil 4 is located in the cooling area, wherein the external cooling jacket 3 has an air inlet 31 and an air outlet 32 ​​for circulating cooling air, wherein the external cooling coil 4 has a water inlet 41 and a water outlet 42 for circulating cooling water, wherein the external cooling jacket 3 has an air inlet 31 and an air outlet 32 ​​for circulating cooling air, wherein the external cooling coil 4 has a water inlet 41 and a water outlet 42 for circulating cooling water, wherein the external cooling jacket 3 has an air inlet 31 and an air outlet 32 ​​for circulating cooling air, wherein the external cooling coil 4 has an air inlet 41 and an air ... jacket 3 has an air inlet 31 and an air outlet 32 ​​for circulating cooling air, wherein the external cooling coil 4 has an air inlet 41 and an air outlet 42 for circulating cooling water, wherein the external cooling jacket 3 has an air in The reaction tank 1 is provided with a flow regulating component 5 for synchronously controlling the air inlet flow rate of the external cooling jacket 3 and the water inlet flow rate of the external cooling coil 4. The flow regulating component 5 cooperates with the air inlet 31 of the external cooling jacket 3 and the water inlet 41 of the external cooling coil 4. The reaction tank 1 is provided with a speed sensor 21 for sensing the stirring speed of the agitator 2 and a controller for controlling the flow regulating component 5. The speed sensor 21 is electrically connected to the controller. When the speed of the agitator 2 gradually increases, the opening of the air inlet 31 of the external cooling jacket 3 and the water inlet 41 of the external cooling coil 4 are gradually approaching a fully open state.

[0035] When preparing sodium citrate, first, the reaction liquid to be treated is added into the reaction tank 1 through the feed port 11 at the top of the reaction tank 1. In the process of preparing sodium citrate, the agitator 2 in the reaction tank 1 is started to stir the reaction liquid. The speed sensor 21 starts to detect the speed of the agitator 2 and transmits the signal to the controller. The controller adjusts the opening of the flow regulating component 5 to the air inlet 31 and the water inlet 41 according to the signal of the speed sensor 21, thereby controlling the air inlet flow of the external cooling jacket 3 and the water inlet flow of the external cooling coil 4.

[0036] As the air inlet 31 of the outer cooling jacket 3 gradually opens, cold air begins to flow into the cooling area between the outer cooling jacket and the reaction tank 1. When the cold air passes through the cooling area, it absorbs the heat of the outer wall of the reaction tank 1, thereby gradually reducing the temperature inside the reaction tank 1. As the speed of the agitator 2 increases, the opening of the air inlet 31 gradually increases, and the flow rate of the cold air also increases, ensuring that the cooling effect continues to improve.

[0037] As the water inlet 41 of the external cooling coil 4 gradually opens, cooling water begins to flow into the external cooling coil 4. When the cooling water passes through the external cooling coil 4, it absorbs the heat of the outer wall of the reaction tank 1, further reducing the temperature inside the reaction tank 1. As the speed of the agitator 2 increases, the opening of the water inlet 41 gradually increases, and the flow rate of the cooling water also increases, ensuring the continuous improvement of the cooling effect.

[0038] The double cooling of the external cooling jacket 3 and the external cooling coil 4 ensures a more uniform temperature distribution in the lower half of the reaction tank 1. The flow of cold air and cooling water in the cooling area enables heat to be evenly absorbed, avoiding the occurrence of local overcooling.

[0039] The speed sensor 21 monitors the speed of the agitator 2 in real time and transmits the data to the controller. The controller dynamically adjusts the opening of the water inlet 41 and the air inlet 31 of the flow regulating component 5 according to the change of the speed, ensuring that the flow of cold air and cooling water matches the speed of the agitator 2. When the speed of the agitator 2 gradually increases, the opening of the air inlet 31 and the water inlet 41 gradually approaches full opening, ensuring the optimization of the cooling effect. It avoids the increase in the rate of nucleation formation due to rapid cooling, so that the number of nuclei increases, thereby forming a smaller crystal size. That is, it avoids uneven crystallization caused by local temperature unevenness, and achieves a cooling rate from slow to fast, thereby effectively controlling the particle size of the crystal formation.

[0040] See also Figure 3-Figure 10 As shown, the reaction tank 1 is also provided with an inner cooling coil 6 which is spirally wound in its lower half and is in direct contact with the reaction liquid. The inner cooling coil 6 also has a water inlet 41 and a water outlet 42 for cooling water to flow. A cooling chamber 7 for storing cooling water is fixedly provided on the reaction tank 1, and the water inlet 41 of the outer cooling coil 4 and the water inlet 41 of the inner cooling coil 6 are connected. The agitator 2 has a first stirring part and a second stirring part. The first stirring part is located in the area surrounded by the inner cooling coil 6, and the second stirring part is located in the area between the outer wall of the reaction tank 1 and the inner cooling coil 6.

[0041] When the cooling process starts, cooling water is filled into the cooling chamber 7, and as the water inlets 41 of the outer cooling coil 4 and the inner cooling coil 6 are gradually opened, the cooling water enters the outer cooling coil 4 and the inner cooling coil 6 respectively. The cooling water of the outer cooling coil 4 absorbs the heat of the outer wall of the reaction tank 1, reducing the temperature inside the reaction tank 1. The cooling water of the inner cooling coil 6 directly contacts the reaction liquid, absorbing the heat of the reaction liquid, and at the same time, the first stirring part and the second stirring part stir different areas in the reaction tank 1, thereby increasing the uniformity of the temperature inside the reaction tank 1, improving the heat exchange efficiency, and further reducing the temperature inside the reaction tank 1.

[0042] The inner cooling coil 6 is spirally wound around the lower half of the reaction tank 1 and in direct contact with the reaction liquid, so that the cooling water can absorb the heat of the reaction liquid more efficiently, thereby more effectively and evenly reducing the temperature of the reaction liquid. Compared with the cooling effect of the outer cooling coil 4, the path and resistance of heat transfer are reduced. It helps to avoid local overcooling and ensure that the temperature distribution in the reaction tank 1 is more uniform, thereby improving the stability of the reaction and the quality of the product.

[0043] See also Figure 3-Figure 10As shown, the water outlet 42 of the external cooling coil 4 is connected to the air outlet 32 ​​of the external cooling jacket 3, and a drainage chamber 8 connected to the water outlet 42 of the internal cooling coil 6 is fixedly provided in the reaction tank 1, and the drainage chamber 8 has a pipe 81 extending outward. When the external cooling jacket 3 and the external cooling coil 4 are venting and draining respectively, the cold air and cooling water are in a state of being discharged outward from the air outlet 32 ​​on the external cooling jacket, and when the internal cooling coil 6 is draining, the cooling water is in a state of being discharged outward from the pipe 81 on the drainage chamber 8.

[0044] The first stirring part has a sleeve rotatably mounted on the pipe 81, and the sleeve is connected to the pipe 81 through a bearing. The sleeve can be driven to rotate by a gear or a belt, and the specific gear transmission device or belt transmission device is not shown in the figure; the second stirring part has a rotating shaft rotatably connected between the drainage chamber 8 and the reaction tank 1, and the bottom of the reaction tank 1 is fixedly provided with a rotating motor that can drive the rotating shaft to rotate and thus drive the second stirring part to rotate as a whole, and the rotating motor is not shown in the figure; the first stirring part and the second stirring part are rotated by different driving methods respectively to ensure the effective implementation of the stirring process; when the cooling process is completed, since the water outlet 42 of the external cooling coil 4 is connected to the air outlet 32 ​​of the external cooling jacket 3, the cold air and cooling water are discharged outward from the air outlet 32 ​​on the external cooling jacket.

[0045] At the same time, the cooling water of the inner cooling coil 6 is discharged outward through the pipe 81 on the drainage chamber 8. The drainage chamber 8 is arranged inside the reaction tank 1 and is fixedly connected to the reaction tank 1. One end of the pipe 81 is fixedly connected to the drainage chamber 8, and the other end extends outward through the reaction tank 1. The pipe 81 is connected to the drainage chamber 8, and the water discharged from the inner cooling coil 6 through the water outlet 42 first enters the drainage chamber 8. However, the pipe 81 is connected to the external water pump to pump out the water in the drainage chamber 8, thereby ensuring the smooth operation of the inner cooling coil 6, avoiding the accumulation of cooling water and cold air, and maintaining the continuity of the cooling effect. The cooling effect and the temperature control accuracy in the reaction tank 1 are further improved, ensuring the stability of the reaction process and the quality of the product.

[0046] See also Figure 2-Figure 10As shown, the flow regulating assembly 5 includes a first plug body 51 arranged at the air inlet 31 of the outer cooling jacket 3 and a second plug body 52 respectively arranged at the water inlet 41 of the outer cooling coil 4 and the inner cooling coil 6, the first plug body 51 can move relative to the air inlet 31, and the second plug body 52 can move relative to the water inlet 41. When the first plug body 51 and the second plug body 52 respectively block the air inlet 31 and the water inlet 41, the reaction liquid in the reaction tank 1 is in a state of not being cooled, and when the first plug body 51 and the second plug body 52 respectively open the air inlet 31 and the water inlet 41, the reaction liquid in the reaction tank 1 is in a state of being cooled.

[0047] When the first plug 51 and the second plug 52 of the flow regulating assembly 5 respectively block the air inlet 31 of the outer cooling jacket and the water inlet 41 of the outer cooling coil 4 and the inner cooling coil 6, the reaction liquid in the reaction tank 1 is in an uncooled state.

[0048] When cooling is required, the first plug body 51 and the second plug body 52 open the air inlet 31 and the water inlet 41 respectively, and cold air enters through the air inlet 31 of the outer cooling jacket 3, and cooling water enters through the water inlet 41 of the outer cooling coil 4 and the inner cooling coil 6. The cold air and cooling water absorb the heat of the outer wall of the reaction tank 1 and the reaction liquid respectively.

[0049] The heat of the reaction liquid is taken away by the cold air and the cooling water. Through the double cooling method, the temperature distribution in the reaction tank 1 is ensured to be uniform, thereby improving the cooling effect.

[0050] See also Figure 2-Figure 10 As shown, the flow regulating assembly 5 also includes a linear drive 53 for synchronously controlling the movement of the first plug body 51 and the second plug body 52. ​​When the linear drive 53 drives the first plug body 51 and the second plug body 52 to move away from the air inlet 31 and the water inlet 41 respectively, the air inlet 31 and the water inlet 41 are in a synchronous and progressive opening state, so that the reaction liquid is cooled at an appropriate speed.

[0051] When the cooling process needs to be started, the linear drive 53 in the flow regulating assembly 5 will synchronously control the movement of the first plug 51 and the second plug 52, so that the first plug 51 and the second plug 52 are respectively away from the air inlet 31 of the outer cooling jacket and the water inlet 41 of the outer cooling coil 4 and the inner cooling coil 6.

[0052] As the air inlet 31 and the water inlet 41 are opened synchronously and gradually, the flow rates of cold air and cooling water gradually increase. Cold air enters through the air inlet 31 of the outer cooling jacket and absorbs heat. Cooling water enters through the water inlet 41 of the outer cooling coil 4 and the inner cooling coil 6 and absorbs heat.

[0053] It ensures that the reaction liquid is cooled at an appropriate speed, avoids local overcooling caused by too fast cooling speed, and also prevents insufficient cooling, thereby achieving precise control of the temperature in the reaction tank 1 and improving the cooling effect and reaction stability.

[0054] See also Figure 3-Figure 5 and Figure 8-Figure 10 As shown, the first plug body 51 and the second plug body 52 are both made of rubber.

[0055] Since the first plug body 51 and the second plug body 52 are made of rubber material, they have good sealing performance and wear resistance, ensuring a tight fit between the first plug body 51 and the air inlet 31 and between the second plug body 52 and the water inlet 41 .

[0056] It effectively prevents the leakage of cold air and cooling water, prevents the cooling rate from being affected, accurately controls the cooling process, and improves the cooling effect.

[0057] See also Figure 3-Figure 5 and Figure 8-Figure 10 As shown, the first plug body 51 is specifically a block structure, the second plug body 52 is specifically a conical structure, and the cooling chamber 7 has a valve sleeve 521 that can fit with the second plug body 52 at the position corresponding to the water inlet 41. When the first plug body 51 moves, the first plug body 51 is in a state of moving in contact with the outer cooling jacket 3, and the second plug body 52 is synchronously in a state of moving relative to the valve sleeve 521.

[0058] When the cooling process is started, the linear drive 53 in the flow regulating assembly 5 synchronously controls the movement of the first plug 51 and the second plug 52. The first plug 51 moves against the outer cooling jacket 3 and gradually moves away from the air inlet 31 of the outer cooling jacket. The second plug 52 synchronously moves relative to the valve sleeve 521 on the cooling chamber 7 and gradually moves away from the water inlet 41 of the outer cooling coil 4 and the inner cooling coil 6.

[0059] As the air inlet 31 and the water inlet 41 are opened synchronously and gradually, the flow rates of the cold air and cooling water are gradually increased, and the cooling effect is gradually improved, thereby ensuring that the reaction liquid is cooled at an appropriate speed and improving the cooling effect.

[0060] See also Figure 3-Figure 5 and Figure 8-Figure 10 As shown, the linear drive 53 has a lifting plate 531 arranged in the cooling chamber 7 and a lifting rod 532 fixedly connected between the lifting plate 531 and the first plug body 51, each second plug body 52 is fixedly connected to the lifting plate 531, and the cooling chamber 7 and the outer cooling jacket 3 are provided with openings for the lifting rod 532 to move. When the lifting rod 532 moves, the first plug body 51 and the second plug body 52 are in a state of synchronous movement.

[0061] When the linear drive 53 pushes the lifting rod 532 to move upward, the lifting plate 531 moves upward accordingly, and the lifting rod 532 drives the first plug body 51 to move close to the outer cooling jacket 3, gradually moving away from the air inlet 31 of the outer cooling jacket 3, and the area of ​​the air inlet 31 blocked gradually decreases, and the air intake gradually increases. At the same time, the second plug body 52 fixedly connected to the lifting plate 531 synchronously moves relative to the valve sleeve 521 on the cooling cabin 7, gradually moving away from the valve sleeve 521, and the distance between the second plug body 521 and the valve sleeve 521 gradually increases, and the water intake gradually increases, thereby achieving synchronous regulation.

[0062] When the linear drive 53 drives the lifting plate 531 to move downward until the second plug body 52 completely blocks the valve sleeve 521, the first plug body 51 synchronously and completely blocks the air inlet 31. At this time, the lifting plate 531 cannot continue to move downward, ensuring that the air inlet 31 of the outer cooling jacket 3 and the water inlet 41 of the outer cooling coil 4 and the inner cooling coil 6 are all in a closed state.

[0063] The linkage between the lifting rod 532 and the lifting plate 531 ensures the synchronous movement of the first plug body 51 and the second plug body 52, and realizes the precise control of the flow of cold air and cooling water, thereby controlling the cooling speed of the reaction liquid.

[0064] See also Figure 3-Figure 5 and Figure 8-Figure 10 As shown, the lifting plate 531 has a plurality of guide rods 5311 extending vertically upward through the cooling chamber 7 and outward, and the cooling chamber 7 is provided with a guide opening for the guide rods 5311 to pass through, and each guide rod 5311 is sleeved with a return spring 5312 fixedly connected between the cooling chamber 7 and the lifting plate 531, and when the first plug body 51 and the second plug body 52 respectively close the air inlet 31 and the water inlet 41, the return spring 5312 is in an uncompressed state.

[0065] When the first plug body 51 and the second plug body 52 need to close the air inlet 31 and the water inlet 41 respectively, the linear drive 53 stops driving the lifting rod 532. Under the action of the return spring 5312, the return spring 5312 gradually returns to the uncompressed state, ensuring that the first plug body 51 and the second plug body 52 are in the initial position, which is convenient for the next operation.

[0066] The double cooling decolorization and refining device is used in the preparation of sodium citrate.

[0067] The present invention detects the rotation speed of the agitator 2 through the rotation speed sensor 21 and transmits the signal to the controller. The controller adjusts the flow regulating component 5 according to the rotation speed signal, and gradually increases the cold air flow of the external cooling jacket 3 and the cooling water flow of the external cooling coil 4. As the rotation speed of the agitator 2 increases, the opening of the air inlet 31 and the water inlet 41 gradually increases, ensuring the continuous improvement of the cooling effect.

[0068] The dual cooling method of cold air and cooling water makes the temperature distribution in the lower half of the reaction tank 1 more uniform, avoiding local overcooling. The particle size of the crystal formation is effectively controlled by the cooling rate from slow to fast, avoiding the increase in the number of crystal nuclei and uneven crystallization caused by rapid cooling, thereby improving the purity and yield of sodium citrate.

[0069] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A double cooling decolorization and refining device, comprising a reaction tank (1), wherein the reaction tank (1) is provided with a stirrer (2), and the reaction tank (1) has a feed inlet (11) and a discharge outlet (12); characterized in that: The reactor also comprises an external cooling jacket (3) fixedly mounted on the lower half of the reaction tank (1) and an external cooling coil (4) spirally wound on the lower half of the reaction tank (1) and in contact with the outer wall of the reaction tank (1), wherein a cooling area is formed between the external cooling jacket (3) and the reaction tank (1), and the external cooling coil (4) is located in the cooling area; the external cooling jacket (3) has an air inlet (31) and an air outlet (32) for circulating cooling air; the external cooling coil (4) has a water inlet (41) and a water outlet (42) for circulating cooling water; the reactor (1) is provided with a flow regulating component (5) for synchronously controlling the air inlet flow of the external cooling jacket (3) and the water inlet flow of the external cooling coil (4), wherein the flow regulating component (5) is connected to the air inlet (31) of the external cooling jacket (3) and the water outlet (42) of the external cooling coil (4). 31) and the water inlet (41) of the external cooling coil (4); a speed sensor (21) for sensing the stirring speed of the stirrer (2) and a controller for controlling the flow regulating component (5) are provided on the reaction tank (1), and the speed sensor (21) is electrically connected to the controller; when the speed of the stirrer (2) gradually increases, the opening of the air inlet (31) of the external cooling jacket (3) and the water inlet (41) of the external cooling coil (4) are gradually approaching a fully opened state; the reaction tank (1) is also provided with an internal cooling coil (6) spirally wound on its lower half and in direct contact with the reaction liquid, and the internal cooling coil (6) also has a water inlet (41) and a water outlet (42) for cooling water to flow; the reaction tank (1) is fixedly provided with a water inlet (41) for cooling water to flow through the external cooling coil (31). A cooling chamber (7) for storing cooling water is connected to a water inlet (41) of the pipe (4) and a water inlet (41) of the inner cooling coil (6); a water outlet (42) of the outer cooling coil (4) is connected to an air outlet (32) of the outer cooling jacket (3); a drainage chamber (8) connected to the water outlet (42) of the inner cooling coil (6) is fixedly provided in the reaction tank (1); the drainage chamber (8) has a pipe (81) extending outwardly; when the outer cooling jacket (3) and the outer cooling coil (4) are respectively exhausted and drained, the cold air and the cooling water are both in a state of being discharged outwardly from the air outlet (32) on the outer cooling jacket; when the inner cooling coil (6) is drained, the cooling water is in a state of being discharged outwardly from the pipe (81) on the drainage chamber (8); flow rate The regulating assembly (5) comprises a first plug body (51) arranged at the air inlet (31) of the outer cooling jacket and a second plug body (52) arranged at the water inlet (41) of the outer cooling coil (4) and the inner cooling coil (6), respectively; the first plug body (51) is movable relative to the air inlet (31), and the second plug body (52) is movable relative to the water inlet (41); when the first plug body (51) and the second plug body (52) respectively block the air inlet (31) and the water inlet (41), the reaction liquid in the reaction tank (1) is in a state of not being cooled; and when the first plug body (51) and the second plug body (52) respectively open the air inlet (31) and the water inlet (41), the reaction liquid in the reaction tank (1) is in a state of being cooled;The flow regulating assembly (5) further comprises a linear drive (53) for synchronously controlling the movement of the first plug body (51) and the second plug body (52); when the linear drive (53) drives the first plug body (51) and the second plug body (52) to move away from the air inlet (31) and the water inlet (41) respectively, the air inlet (31) and the water inlet (41) are in a synchronous and progressively opened state, so that the reaction liquid is cooled at an appropriate speed; the linear drive (53) comprises a lifting plate (531) arranged in the cooling chamber (7) and a lifting rod (532) fixedly connected between the lifting plate (531) and the first plug body (51); each second plug body (52) is fixedly connected to the lifting plate (531); a through hole for the lifting rod (532) to move is provided on the cooling chamber (7) and the outer cooling jacket (3); when the lifting rod (532) moves, the first plug body (51) and the second plug body (52) are in a synchronously moving state. ; 2. The double cooling decolorization and refining device according to claim 1, characterized in that: The first plug body (51) and the second plug body (52) are both made of rubber.

3. The double cooling decolorization and refining device according to claim 1, characterized in that: The first plug body (51) is specifically a block structure, and the second plug body (52) is specifically a cone structure. The cooling chamber (7) has a valve sleeve (521) at a position corresponding to the water inlet (41) that can fit with the second plug body (52). When the first plug body (51) moves, the first plug body (51) is in a state of moving in contact with the outer cooling jacket (3), and the second plug body (52) is synchronously in a state of moving relative to the valve sleeve (521).

4. The double cooling decolorization and refining device according to claim 1, characterized in that: The lifting plate (531) has a plurality of guide rods (5311) extending vertically upward through the cooling chamber (7) and outwardly. The cooling chamber (7) is provided with guide openings for the guide rods (5311) to pass through. Each guide rod (5311) is sleeved with a return spring (5312) fixedly connected between the cooling chamber (7) and the lifting plate (531). When the first plug body (51) and the second plug body (52) respectively close the air inlet (31) and the water inlet (41), the return spring (5312) is in an uncompressed state.

5. The application of a double cooling decolorization and refining device in the preparation of sodium citrate is characterized in that: A double cooling decolorization and refining device as described in any one of claims 1 to 4 is used.

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