Efficient purification and crystallization equipment for sugar alcohol production

Abstract

The utility model discloses a kind of efficient purification crystallization equipment for sugar alcohol production, comprising: purification tank, the top cover middle part of purification tank is fixedly connected with feed pipe, the inside of purification tank is sequentially provided with primary filter mechanism, ion exchange mechanism and precision filter mechanism from top to bottom, the bottom of purification tank is fixedly connected with guide pipe, the bottom end of guide pipe is fixedly connected with crystallization tank, temperature control jacket is fixedly sleeved on the outside of crystallization tank, bidirectional stirring mechanism is arranged in the inside of crystallization tank, the bottom middle end of crystallization tank is fixedly connected with discharge valve, and discharge valve is provided with discharge pipe at one end;The utility model starts drive motor, rotates double stirring shaft by gear transmission, spiral stirring blade circulates material up and down, transverse stirring rod+stirring tooth realizes horizontal shearing, eliminates dead angle, avoids crystal agglomeration or crystallization slowly, after crystallization is completed, opens discharge valve, crystal is discharged through discharge pipe, enters subsequent process, and finally obtains high-purity, particle-size uniform sugar alcohol finished product.

Description

Technical Field

[0001] This utility model relates to the technical field of sugar alcohol purification and crystallization equipment, specifically a high-efficiency purification and crystallization equipment for sugar alcohol production. Background Technology

[0002] Sugar alcohols are important functional sweeteners, widely used in food, medicine, and chemical industries. Their production process typically includes key steps such as fermentation, concentration, purification, and crystallization. Among these, purification and crystallization are the core steps that determine the purity, particle size, and yield of sugar alcohol products, directly affecting product quality and market competitiveness.

[0003] In existing sugar alcohol production processes, purification equipment often employs single-filtration or single-stage ion exchange structures, which are insufficient to effectively remove impurities, colloids, and ionic contaminants from raw materials. This results in low purification efficiency and insufficient product purity. Meanwhile, crystallization equipment typically uses unidirectional stirring, which creates dead zones in the stirring process. This can lead to uneven temperature distribution and unbalanced solute concentration in the crystallization system, resulting in problems such as inconsistent crystal particle size and severe agglomeration. This not only affects the efficiency of subsequent separation and drying processes but also reduces the commercial value of the product. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency purification and crystallization equipment for sugar alcohol production in order to solve the above problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency purification and crystallization device for sugar alcohol production, comprising: a purification tank, a feed pipe fixedly connected to the middle of the top cover of the purification tank, a primary filtration mechanism, an ion exchange mechanism, and a precision filtration mechanism arranged sequentially from top to bottom inside the purification tank, a guide pipe fixedly connected to the bottom of the purification tank, a crystallization tank fixedly connected to the bottom end of the guide pipe, a temperature control jacket fixedly fitted on the outside of the crystallization tank, a bidirectional stirring mechanism arranged inside the crystallization tank, a discharge valve fixedly connected to the middle of the bottom of the crystallization tank, and a discharge pipe provided at one end of the discharge valve.

[0006] As a further embodiment of this utility model: the primary filtration mechanism includes a fixed ring, a support perforated plate, and a quartz sand filter layer. The fixed ring is vertically slidably connected to the inside of the purification tank, the support perforated plate is fixedly connected to the inner side of the fixed ring, and the quartz sand filter layer is laid on top of the support perforated plate. Multiple sets of positioning pins are symmetrically fixedly connected to the bottom of the fixed ring. The positioning pins are movably inserted into the inner wall of the purification tank. A movable top plate is provided between the multiple sets of positioning pins. The upper surface of the movable top plate has a protrusion adapted to the aperture of the support perforated plate. Multiple sets of connecting sliding parts are symmetrically fixedly connected to the bottom of the movable top plate. A limit rod is symmetrically fixedly connected to the bottom of the fixed ring. A return spring is fixedly connected to the bottom of the fixed ring and to the outer ring of the limit rod. The other end of the connecting sliding part is vertically slidably connected to the limit rod, and the other end of the return spring is fixedly connected to the connecting sliding part.

[0007] As a further embodiment of this utility model: the ion exchange mechanism includes a mounting frame, a cation exchange resin layer and an anion exchange resin layer. The mounting frame is fixedly connected to the inner wall of the purification tank and is located below the primary filtration mechanism. The cation exchange resin layer and the anion exchange resin layer are both disposed inside the mounting frame, with the anion exchange resin layer located below the cation exchange resin layer. The top of the mounting frame is provided with a sloping guide ring.

[0008] As a further embodiment of this utility model: the precision filtration mechanism includes a support frame, a polytetrafluoroethylene filter membrane, and an activated carbon adsorption layer. The support frame is fixedly connected to the inner wall of the purification tank and located below the ion exchange mechanism. The polytetrafluoroethylene filter membrane is fixedly connected to the upper inner side of the support frame, and the activated carbon adsorption layer is fixedly connected to the lower inner side of the support frame. A conical guide hopper is fixedly connected to the bottom of the support frame, and the bottom end of the conical guide hopper is connected to the top end of the guide pipe.

[0009] As a further embodiment of this utility model: the bidirectional stirring mechanism includes a drive motor, a driving gear, and a driven gear. The drive motor is fixedly connected to the top middle of the crystallization tank, the driving gear is fixedly connected to the output end of the drive motor, and the driven gear is meshed with both sides of the driving gear. The top of the crystallization tank is symmetrically rotatably connected to a stirring shaft. The top ends of the two sets of stirring shafts are respectively fixedly connected to the bottom of the two sets of driven gears. The outer side of the stirring shaft is fixedly connected with a spiral stirring blade and a transverse stirring rod from top to bottom. The outer side of the transverse stirring rod is fixedly connected with stirring teeth.

[0010] As a further embodiment of this utility model: an inlet pipe is fixedly connected to the upper end of one side of the temperature control jacket, an outlet pipe is fixedly connected to the lower end of one side of the temperature control jacket, and a spiral guide pipe is fixedly connected inside the temperature control jacket, with the two ends of the spiral guide pipe connected to the inlet pipe and the outlet pipe respectively.

[0011] As a further embodiment of this utility model: the top of the crystallization tank is symmetrically and fixedly connected with bearing seats, and the two sets of stirring shafts are respectively rotatably connected to the inner side of the two sets of bearing seats. A sealing ring is fixedly sleeved on the outer side of the stirring shaft, and the top end of the sealing ring is in contact with the inner wall of the top of the crystallization tank.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] In this invention, the concentrated sugar alcohol solution to be purified enters the purification tank through the feed pipe. It first passes through a quartz sand filter layer to intercept suspended particles and colloids, completing the initial filtration. The movable top plate moves up and down with the solution pressure, and the protrusion inserts into the support plate channel and lifts the filter layer, automatically clearing blockages without the need for frequent shutdowns for cleaning. The fixed ring is slidably connected to the tank wall through a positioning pin, making the entire mechanism easy to disassemble and assemble, and highly efficient in maintenance.

[0014] After initial filtration, the solution flows to the ion exchange unit. The inclined guide ring allows the solution to penetrate the cation exchange resin layer evenly and adsorb metal cations. Then, the solution passes through the anion exchange resin layer to adsorb anionic impurities, achieving ion-level purification and significantly reducing the impurity content of the solution, laying a high-purity foundation for subsequent crystallization.

[0015] The solution continues to pass through a polytetrafluoroethylene filter membrane to trap tiny debris, while activated carbon adsorbs pigments and odors, achieving the required crystallization purity. The conical feed hopper guides the pure solution entirely into the feed tube, eliminating residue and waste, and precisely delivering it to the crystallization tank.

[0016] Based on the properties of sugar alcohols, a regulating medium is introduced from the inlet pipe into the temperature control jacket. The medium flows along the spiral guide pipe, ensuring uniform temperature in all areas of the jacket and maintaining stable temperature inside the crystallizer. The medium can be recycled, reducing energy consumption.

[0017] The drive motor is started, and the dual stirring shafts are rotated through gear transmission. The spiral stirring blades drive the material to circulate up and down. The horizontal stirring rod and stirring teeth achieve horizontal shearing, eliminate dead corners, and avoid crystal agglomeration or slow crystallization. After crystallization, the discharge valve is opened, and the crystals are discharged through the discharge pipe to enter the subsequent process, finally obtaining a high-purity, uniformly sized sugar alcohol product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the spiral guide tube in this utility model;

[0020] Figure 3 This is a schematic diagram of the purification tank in this utility model;

[0021] Figure 4This is a schematic diagram of the primary filtration mechanism in this utility model;

[0022] Figure 5 This is a schematic diagram of the ion exchange mechanism in this utility model;

[0023] Figure 6 This is a schematic diagram of the precision filtration mechanism in this utility model;

[0024] Figure 7 This is a schematic diagram of the bidirectional stirring mechanism in this utility model.

[0025] In the diagram: 1. Purification tank; 2. Feed pipe; 3. Primary filtration mechanism; 31. Fixing ring; 32. Support perforated plate; 33. Quartz sand filter layer; 34. Positioning pin; 35. Movable top plate; 36. Connecting sliding part; 37. Limiting rod; 38. Return spring; 4. Ion exchange mechanism; 41. Mounting frame; 42. Cation exchange resin layer; 43. Anion exchange resin layer; 44. Inclined guide ring; 5. Precision filtration mechanism; 51. Support frame; 52. Polytetrafluoroethylene (PTFE) filter. 53. Fluoroethylene filter membrane; 54. Activated carbon adsorption layer; 55. Conical feed hopper; 6. Feed pipe; 7. Crystallization tank; 8. Temperature control jacket; 86. Inlet pipe; 87. Outlet pipe; 88. Spiral guide pipe; 99. Bidirectional stirring mechanism; 90. Drive motor; 91. Drive gear; 92. Driven gear; 93. Driven gear; 94. Stirring shaft; 95. Spiral stirring blade; 96. Transverse stirring rod; 97. Stirring teeth; 98. Bearing seat; 99. Sealing ring; 10. Discharge valve; 11. Discharge pipe. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will be described below based on its overall structure.

[0028] Reference Figures 1 to 7 In this embodiment of the present invention, a high-efficiency purification and crystallization device for sugar alcohol production includes: a purification tank 1, which serves as the core container for purifying sugar alcohol concentrate, providing a stable space for solution purification, and is the basic carrier for achieving three-stage purification. A feed pipe 2 is fixedly connected to the middle of the top cover of the purification tank 1, which is used to accurately introduce the sugar alcohol concentrate to be purified into the purification tank 1.

[0029] The purification tank 1 is equipped with a primary filtration mechanism 3, an ion exchange mechanism 4, and a precision filtration mechanism 5 arranged sequentially from top to bottom. The primary filtration mechanism 3 performs the first purification of the concentrate, the ion exchange mechanism 4 completes the ion-level deep purification, and the precision filtration mechanism 5 performs the third purification.

[0030] The bottom of the purification tank 1 is fixedly connected to a feed pipe 6, which is the conveying channel for the purified sugar alcohol solution. The bottom end of the feed pipe 6 is fixedly connected to a crystallization tank 7, which serves as the core container for sugar alcohol crystallization and provides space for crystal growth. A temperature control jacket is fixedly fitted on the outside of the crystallization tank 7.

[0031] The crystallization tank 7 is equipped with a bidirectional stirring mechanism 9 to achieve all-round stirring of the solution inside the crystallization tank 7. A discharge valve 10 is fixedly connected to the bottom middle of the crystallization tank 7, and a discharge pipe 11 is provided at one end of the discharge valve 10.

[0032] Reference Figure 3 and Figure 4The primary filtration mechanism 3 includes a fixing ring 31, a support perforated plate 32, and a quartz sand filter layer 33. The fixing ring 31 is vertically slidably connected to the inside of the purification tank 1. The support perforated plate 32 is fixedly connected to the inner side of the fixing ring 31, and the quartz sand filter layer 33 is laid on the top of the support perforated plate 32. Multiple sets of positioning pins 34 are symmetrically fixedly connected to the bottom of the fixing ring 31. The positioning pins 34 are movably inserted into the inner wall of the purification tank 1. A movable top plate 35 is provided between the multiple sets of positioning pins 34. The upper surface of the movable top plate 35 has a protrusion adapted to the aperture of the support perforated plate 32. Multiple sets of connecting sliding parts 36 are symmetrically fixedly connected to the bottom of the movable top plate 35. A limit rod 37 is symmetrically fixedly connected to the bottom of the fixing ring 31. A return spring 38 is fixedly connected to the bottom of the fixing ring 31 and to the outer ring of the limit rod 37. The other end of the connecting sliding part 36 is vertically slidably connected to the limit rod 37, and the other end of the return spring 38 is vertically slidably connected to the connecting sliding part 36. The component 36 is fixedly connected. The concentrated liquid flows through the quartz sand filter layer 33 on top of the support plate 32. The porous structure of the quartz sand directly traps suspended particles, macromolecular colloids and other impurities in the solution, completing the first stage of purification. The support plate 32 provides stable support for the quartz sand filter layer 33, preventing it from collapsing due to gravity. When the concentrated liquid permeates downward under the action of gravity, it will exert pressure on the movable top plate 35, pushing the movable top plate 35 to slide downward along the limit rod 37 through the connecting sliding component 36, while compressing the reset spring. Spring 38, when the flow rate of the concentrate fluctuates or the amount of impurities retained changes, the return spring 38 rebounds, driving the movable top plate 35 to return to its original position. During this process, the protrusions on the surface of the movable top plate 35 that are adapted to the aperture of the support orifice plate 32 will insert into the channel of the support orifice plate 32 and lift the quartz sand filter layer 33, clearing the impurities blocking the pores of the filter layer and ensuring that the filtration channel is unobstructed. The fixing ring 31 is slidably connected to the inner wall of the purification tank 1 through the positioning pin 34, which facilitates the installation and disassembly of the entire primary filtration mechanism 3.

[0033] Reference Figure 3 and Figure 5The ion exchange mechanism 4 includes a mounting frame 41, a cation exchange resin layer 42, and an anion exchange resin layer 43. The mounting frame 41 is fixedly connected to the inner wall of the purification tank 1 and is located below the primary filtration mechanism 3. Both the cation exchange resin layer 42 and the anion exchange resin layer 43 are disposed inside the mounting frame 41, with the anion exchange resin layer 43 located below the cation exchange resin layer 42. The top of the mounting frame 41 is provided with a sloping guide ring 44. The solution first contacts the sloping guide ring 44 at the top of the mounting frame 41. The sloping structure evenly disperses the solution onto the surface of the cation exchange resin layer 42, avoiding uneven resin utilization caused by localized concentrated penetration of the solution. The cation exchange resin layer 42 adsorbs cationic impurities in the solution and removes metal ions from the solution. The solution, after removing cationic impurities, continues to penetrate downwards to the anion exchange resin layer 43, where the anion exchange resin layer 43 adsorbs anionic impurities in the solution, completing deep purification at the ion level, significantly reducing the ion content in the solution, and improving the purity of the sugar alcohol.

[0034] Reference Figure 3 and Figure 6 The precision filtration mechanism 5 includes a support frame 51, a polytetrafluoroethylene (PTFE) filter membrane 52, and an activated carbon adsorption layer 53. The support frame 51 is fixedly connected to the inner wall of the purification tank 1 and is located below the ion exchange mechanism 4. The PTFE filter membrane 52 is fixedly connected to the upper inner side of the support frame 51, and the activated carbon adsorption layer 53 is fixedly connected to the lower inner side of the support frame 51. A conical guide hopper 54 is fixedly connected to the bottom of the support frame 51, and the bottom end of the conical guide hopper 54 is connected to the top end of the guide pipe 6. The solution first passes through the support frame. The polytetrafluoroethylene filter membrane 52 on the inner side of 51 traps residual tiny resin debris and ultrafine particulate impurities in the solution. Then it flows through the activated carbon adsorption layer 53. The porous structure of the activated carbon adsorbs pigments, odor substances and trace organic impurities in the solution, so that the sugar alcohol solution reaches the purity required for crystallization. The purified sugar alcohol solution enters the conical guide hopper 54. The conical structure, through the inclined surface convergence effect, completely guides the solution into the guide pipe 6, avoiding the solution remaining at the bottom of the purification tank 1 and causing material waste. Finally, it is transported to the crystallization tank 7 through the guide pipe 6.

[0035] Reference Figure 1 , Figure 2 and Figure 7The bidirectional stirring mechanism 9 includes a drive motor 91, a drive gear 92, and a driven gear 93. The drive motor 91 is fixedly connected to the top middle of the crystallization tank 7. The drive gear 92 is fixedly connected to the output end of the drive motor 91. The driven gear 93 is meshed with both sides of the drive gear 92. The top of the crystallization tank 7 is symmetrically rotatably connected to a stirring shaft 94. The top ends of the two sets of stirring shafts 94 are fixedly connected to the bottom of the two sets of driven gears 93 respectively. The outer side of the stirring shaft 94 is fixedly connected with a spiral stirring blade 95 and a transverse stirring rod 96 from top to bottom. The outer side of the transverse stirring rod 96 is fixedly connected with stirring teeth 97.

[0036] The top of the crystallization tank 7 is symmetrically and fixedly connected with bearing seats 98. Two sets of stirring shafts 94 are rotatably connected to the inner sides of the two sets of bearing seats 98. A sealing ring 99 is fixedly sleeved on the outer side of the stirring shaft 94. The top of the sealing ring 99 is in contact with the inner wall of the top of the crystallization tank 7. When the drive motor 91 is started, the drive gear 92 is driven to rotate. The drive gear 92 drives the driven gears 93 on both sides to rotate synchronously through meshing transmission, thereby driving the two sets of stirring shafts 94 to rotate stably along the bearing seats 98. The bearing seats 98 can reduce the rotational friction of the stirring shafts 94. The sealing ring 99 prevents the solution from leaking from the shaft gap. The screw on the outer side of the stirring shaft 94 When the stirring blade 95 rotates, it generates an upward spiral lift force, which drives the high-concentration solution at the bottom of the crystallizer 7 to flow upward. At the same time, the horizontal stirring rod 96 and stirring teeth 97 perform horizontal shearing and mixing of the solution. The two work together to form an all-round flow field of "up and down circulation + horizontal stirring", eliminating the stirring dead corners in the crystallizer 7, ensuring that the sugar alcohol concentration in the solution is uniform, and avoiding crystal agglomeration caused by local supersaturation or slow crystallization caused by local unsaturation. As stirring continues, the sugar alcohol molecules in the solution gradually reach a supersaturated state and precipitate crystals. Under the action of the uniform flow field, the crystals grow stably into particles with uniform particle size.

[0037] Reference Figure 1 and Figure 2The upper end of one side of the temperature control jacket 8 is fixedly connected to an inlet pipe 81, and the lower end of one side of the temperature control jacket 8 is fixedly connected to an outlet pipe 82. A spiral guide pipe 83 is fixedly connected inside the temperature control jacket 8. The two ends of the spiral guide pipe 83 are connected to the inlet pipe 81 and the outlet pipe 82, respectively. After the pure sugar alcohol solution enters the crystallization tank 7, a stable crystallization temperature environment is created by the temperature control jacket 8. According to the crystallization characteristics of the target sugar alcohol, a temperature regulating medium, such as cooling water or constant temperature circulating water, is introduced into the temperature control jacket 8 through the inlet pipe 81. The medium flows along the spiral guide pipe 83 inside the temperature control jacket 8. The spiral structure extends the flow path of the medium in the jacket, ensuring that the temperature of each area of ​​the temperature control jacket 8 is uniform, thereby stabilizing the solution temperature in the crystallization tank 7 at the critical temperature required for crystallization, providing stable temperature conditions for crystal growth. The temperature-regulated medium is discharged through the outlet pipe 82 and can be recycled to reduce energy consumption.

[0038] The working principle of this utility model is as follows:

[0039] The concentrated sugar alcohol solution to be purified enters the equipment through the feed pipe 2 in the middle of the top cover of the purification tank 1. It first contacts the primary filtration mechanism 3. The concentrated solution flows through the quartz sand filter layer 33 on top of the support perforated plate 32. The porous structure of the quartz sand directly traps suspended particles, large molecular colloids and other impurities in the solution, completing the first stage of purification. The support perforated plate 32 provides stable support for the quartz sand filter layer 33 to prevent it from collapsing due to gravity. When the concentrated solution permeates downward under the action of gravity, it will exert pressure on the movable top plate 35, pushing the movable top plate 35 along the limit through the connecting sliding part 36. Position rod 37 slides downwards, simultaneously compressing return spring 38. When the concentrate flow rate fluctuates or the amount of impurities retained changes, return spring 38 rebounds, causing movable top plate 35 to return upwards. During this process, the protrusions on the surface of movable top plate 35 that match the aperture of support orifice plate 32 will insert into the orifice of support orifice plate 32 and lift the quartz sand filter layer 33, clearing the impurities blocking the pores of the filter layer and ensuring unobstructed filtration channels. Fixed ring 31 is slidably connected to the inner wall of purification tank 1 through positioning pin 34, facilitating the installation and disassembly of the entire primary filtration mechanism 3.

[0040] The sugar alcohol solution, after primary filtration, continues to flow downwards into the ion exchange unit 4. The solution first contacts the inclined guide ring 44 at the top of the mounting frame 41. The inclined structure evenly disperses the solution onto the surface of the cation exchange resin layer 42, avoiding uneven resin utilization caused by localized concentrated penetration of the solution. The cation exchange resin layer 42 adsorbs cationic impurities in the solution and removes metal ions. The solution, now free of cationic impurities, continues to penetrate downwards to the anion exchange resin layer 43. The anion exchange resin layer 43 adsorbs anionic impurities in the solution, completing deep purification at the ion level, significantly reducing the ion content in the solution, and improving the purity of the sugar alcohol.

[0041] The solution after ion exchange enters the precision filtration mechanism 5 for the third purification and transportation. The solution first passes through the polytetrafluoroethylene filter membrane 52 inside the support frame 51. The filter membrane traps the tiny resin debris and ultrafine particulate impurities remaining in the solution. Then it flows through the activated carbon adsorption layer 53. The porous structure of the activated carbon adsorbs pigments, odor substances and trace organic impurities in the solution, so that the sugar alcohol solution reaches the purity required for crystallization. The purified sugar alcohol solution enters the conical guide hopper 54. The conical structure, through the inclined surface convergence effect, completely guides the solution into the guide pipe 6, avoiding the solution remaining at the bottom of the purification tank 1 and causing material waste. Finally, it is transported to the crystallization tank 7 through the guide pipe 6.

[0042] After the pure sugar alcohol solution enters the crystallization tank 7, a stable crystallization temperature environment is created by the temperature control jacket 8. According to the crystallization characteristics of the target sugar alcohol, a temperature regulating medium, such as cooling water or constant temperature circulating water, is introduced into the temperature control jacket 8 through the liquid inlet pipe 81. The medium flows along the spiral guide pipe 83 inside the temperature control jacket 8. The spiral structure extends the flow path of the medium in the jacket, ensuring that the temperature of each area of ​​the temperature control jacket 8 is uniform, thereby stabilizing the solution temperature in the crystallization tank 7 at the critical temperature required for crystallization, providing stable temperature conditions for crystal growth. The temperature-regulated medium is discharged through the liquid outlet pipe 82 and can be recycled to reduce energy consumption.

[0043] The drive motor 91 is started, driving the drive gear 92 to rotate. The drive gear 92 drives the driven gears 93 on both sides to rotate synchronously through meshing transmission, thereby driving the two sets of stirring shafts 94 to rotate stably along the bearing housing 98. The bearing housing 98 can reduce the rotational friction of the stirring shafts 94, and the sealing ring 99 prevents the solution from leaking from the shaft gap. When the spiral stirring blades 95 on the outside of the stirring shaft 94 rotate, they generate an upward spiral lift force, which drives the high-concentration solution at the bottom of the crystallizing tank 7 to flow upward. At the same time, the horizontal stirring rod 96 and stirring teeth 97 perform horizontal shearing and mixing of the solution. The two work together to form "up and down circulation + horizontal stirring". The uniform flow field eliminates dead zones in the crystallizer 7, ensuring a uniform concentration of sugar alcohol in the solution and avoiding crystal agglomeration caused by local oversaturation or slow crystallization caused by local unsaturation. As stirring continues, the sugar alcohol molecules in the solution gradually reach a supersaturated state and precipitate crystals. Under the action of the uniform flow field, the crystals grow stably into particles with uniform particle size. When the crystallization process is completed, the discharge valve 10 at the bottom of the crystallizer 7 is opened, and the sugar alcohol crystals and a small amount of mother liquor in the crystallizer 7 are discharged from the equipment through the discharge pipe 11 and enter the subsequent centrifugal separation and drying process to finally obtain a high-purity sugar alcohol product.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency purification and crystallization device for sugar alcohol production, characterized in that, include: A purification tank (1) is provided with a feed pipe (2) fixedly connected to the middle of the top cover of the purification tank (1). The purification tank (1) is provided with a primary filtration mechanism (3), an ion exchange mechanism (4) and a precision filtration mechanism (5) arranged from top to bottom. A guide pipe (6) is fixedly connected to the bottom of the purification tank (1). A crystallization tank (7) is fixedly connected to the bottom end of the guide pipe (6). A temperature control jacket (8) is fixedly fitted on the outside of the crystallization tank (7). A bidirectional stirring mechanism (9) is provided inside the crystallization tank (7). A discharge valve (10) is fixedly connected to the middle of the bottom of the crystallization tank (7). A discharge pipe (11) is provided at one end of the discharge valve (10).

2. The high-efficiency purification and crystallization equipment for sugar alcohol production according to claim 1, characterized in that, The primary filtration mechanism (3) includes: a fixing ring (31), a support perforated plate (32), and a quartz sand filter layer (33). The fixing ring (31) is vertically slidably connected to the inside of the purification tank (1). The support perforated plate (32) is fixedly connected to the inner side of the fixing ring (31). The quartz sand filter layer (33) is laid on the top of the support perforated plate (32). The bottom of the fixed ring (31) is symmetrically fixedly connected to multiple sets of positioning pins (34). The positioning pins (34) are movably inserted into the inner wall of the purification tank (1). A movable top plate (35) is provided between the multiple sets of positioning pins (34). The upper surface of the movable top plate (35) is provided with a protrusion that matches the diameter of the hole in the support plate (32). The bottom of the movable top plate (35) is symmetrically fixedly connected to multiple sets of connecting sliding parts (36). The bottom of the fixed ring (31) is symmetrically fixedly connected to a limiting rod (37). The bottom of the fixed ring (31) and the outer ring of the limiting rod (37) are fixedly connected to a return spring (38). The other end of the connecting sliding part (36) is slidably connected to the limiting rod (37). The other end of the return spring (38) is fixedly connected to the connecting sliding part (36).

3. The high-efficiency purification and crystallization equipment for sugar alcohol production according to claim 1, characterized in that, The ion exchange mechanism (4) includes: a mounting frame (41), a cation exchange resin layer (42), and an anion exchange resin layer (43). The mounting frame (41) is fixedly connected to the inner wall of the purification tank (1) and is located below the primary filtration mechanism (3). The cation exchange resin layer (42) and the anion exchange resin layer (43) are both disposed inside the mounting frame (41). The anion exchange resin layer (43) is located below the cation exchange resin layer (42). The top of the mounting frame (41) is provided with a sloping guide ring (44).

4. The high-efficiency purification and crystallization equipment for sugar alcohol production according to claim 1, characterized in that, The precision filtration mechanism (5) includes: a support frame (51), a polytetrafluoroethylene filter membrane (52), and an activated carbon adsorption layer (53). The support frame (51) is fixedly connected to the inner wall of the purification tank (1) and located below the ion exchange mechanism (4). The polytetrafluoroethylene filter membrane (52) is fixedly connected to the upper inner side of the support frame (51). The activated carbon adsorption layer (53) is fixedly connected to the lower inner side of the support frame (51). A conical guide hopper (54) is fixedly connected to the bottom of the support frame (51). The bottom end of the conical guide hopper (54) is connected to the top end of the guide pipe (6).

5. The high-efficiency purification and crystallization equipment for sugar alcohol production according to claim 1, characterized in that, The bidirectional stirring mechanism (9) includes: a drive motor (91), a drive gear (92), and a driven gear (93). The drive motor (91) is fixedly connected to the top middle of the crystallization tank (7). The drive gear (92) is fixedly connected to the output end of the drive motor (91). The driven gear (93) is meshed with both sides of the drive gear (92). The top of the crystallization tank (7) is symmetrically rotatably connected to a stirring shaft (94). The top ends of the two sets of stirring shafts (94) are fixedly connected to the bottom of the two sets of driven gears (93) respectively. The outer side of the stirring shaft (94) is fixedly connected with a spiral stirring blade (95) and a transverse stirring rod (96) from top to bottom. The outer side of the transverse stirring rod (96) is fixedly connected with stirring teeth (97).

6. The high-efficiency purification and crystallization equipment for sugar alcohol production according to claim 1, characterized in that, The upper end of one side of the temperature control jacket (8) is fixedly connected to an inlet pipe (81), the lower end of one side of the temperature control jacket (8) is fixedly connected to an outlet pipe (82), and a spiral guide pipe (83) is fixedly connected inside the temperature control jacket (8). The two ends of the spiral guide pipe (83) are respectively connected to the inlet pipe (81) and the outlet pipe (82).

7. The high-efficiency purification and crystallization equipment for sugar alcohol production according to claim 5, characterized in that, The top of the crystallization tank (7) is symmetrically fixedly connected with bearing seats (98), and two sets of stirring shafts (94) are rotatably connected to the inner side of the two sets of bearing seats (98). A sealing ring (99) is fixedly sleeved on the outer side of the stirring shaft (94), and the top end of the sealing ring (99) is in contact with the inner wall of the top of the crystallization tank (7).

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