Suspension crystallizer

Abstract

The utility model discloses a suspension crystallizer which comprises a tank body, a water cooling wall and a stripping mechanism, and the tank body comprises a first cavity. The top of the tank body is provided with a first liquid inlet, and the bottom is provided with a discharge port. The first liquid inlet and the discharge hole are communicated with the first cavity. The water cooling wall comprises a shell, a cooling medium inlet and a cooling medium inlet. The tank body is sleeved with the shell, and a second cavity can be formed by the shell and the tank body. The cooling medium inlet and the cooling medium outlet are communicated with the second cavity and are used for circulating a cooling medium, so that the target crystal is separated out from the raw material solution and is attached to the inner wall of the tank body. The stripping mechanism comprises a scraper and a driving device and is used for driving the blade part to rotate through the driving device and stripping the target crystal, so that the target crystal further grows as a crystal nucleus in the solution until the target crystal becomes a large-particle crystal meeting the production requirement. According to the scheme, target crystals are separated out through temperature difference, no new solvent needs to be introduced, and the method is economical and environmentally friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of crystallization and purification of industrial products, in particular to a suspension crystallizer. Background Art

[0002] In the prior art, for the crystallization purification of industrial products, evaporation concentration, distillation, extraction, distillation, crystallization and other methods are generally used for purification. Most of the purifications require high energy consumption or the introduction of new solvents, which is poor in economy and not conducive to environmental protection requirements. Utility Model Content

[0003] In order to overcome the above disadvantages, the purpose of the present invention is to provide a suspension crystallizer to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is a suspension crystallizer, comprising:

[0005] The tank body extends axially and includes a first cavity. A first liquid inlet is provided at the top of the tank body, and a material outlet is provided at the bottom. The first liquid inlet and the material outlet are both connected to the first cavity and are used to flow in the raw material solution for purification.

[0006] The water-cooled wall comprises a shell, a cooling medium inlet and a cooling medium inlet. The shell is sleeved on the tank body along the circumferential direction to form a second cavity with the tank body, and the circumferential direction surrounds the axial direction. The cooling medium inlet and the cooling medium inlet are both connected to the second cavity for circulating the cooling medium so that the target crystal is precipitated from the raw material solution and attached to the inner wall of the tank body.

[0007] The stripping mechanism includes a scraper and a driving device. The scraper extends radially, one end of which is a blade, and the blade is arranged facing the water-cooled wall, and the radial direction is perpendicular to the axial direction. The scraper can rotate circumferentially, and is used to drive the blade to rotate through the driving device to strip the target crystal.

[0008] The utility model provides a suspension crystallizer, in which the raw material solution enters the suspension crystallizer from the first liquid inlet. After the feeding is completed, the cooling medium inlet is introduced with the cooling medium of the temperature required by the process to cool the inner wall of the tank. The target crystals in the raw material solution are crystallized and precipitated on the inner wall of the tank to form a crystal layer. When the crystal layer continues to grow and thicken, it is peeled off by rotating the scraper. The target crystals further grow in the solution as crystal nuclei until they become large-particle crystals that meet production requirements. This solution utilizes temperature difference to precipitate the target crystals, and does not require the introduction of new solvents, which is environmentally friendly. In addition, in addition to peeling off the crystals on the inner wall of the equipment through circular motion, the scraper also accelerates the disturbance of the fluid inside the crystallizer, enhances heat exchange, and makes the internal solution temperature more uniform, thereby obtaining crystals with consistent specifications.

[0009] In some embodiments, a partition extending in an axial spiral direction is provided in the second cavity to form a spiral flow channel. The cooling medium inlet is provided at the bottom of the spiral flow channel, and the cooling medium outlet is provided at the top of the spiral flow channel.

[0010] By adopting the above technical scheme, the interior of the second cavity is processed into a flow channel through a partition, and the cooling medium passes through the spiral flow channel and finally flows out from the cooling medium discharge port. The entire flow process cools the inner wall of the suspension crystallizer so that the temperature of the inner wall is maintained at the crystallization temperature of the product in the raw material solution to precipitate the target crystals.

[0011] In some embodiments, the driving device is a starting motor. The starting motor is arranged at the top of the tank body, and a rotating shaft extending along the axial direction is arranged at the bottom. The rotating shaft is arranged coaxially with the tank body. The rotating shaft is arranged in the first cavity and is used to connect the other end of the fixed scraper along the radial direction.

[0012] By adopting the above technical solution, the rotating shaft of the starting motor drives the scraper to make circular motion. After the scraper moves and the crystal layer thickness grows to a certain extent, the blade of the scraper can peel off the target crystals on the inner wall of the suspended crystallizer, so that a large number of crystals are suspended in the solution inside the equipment and continue to crystallize.

[0013] In some embodiments, the suspension crystallizer further comprises a filter membrane, which is disposed on one side of the first cavity near the discharge port and connected to the bottom of the rotating shaft, and is used to separate the first cavity and allow the target crystals to settle to the bottom of the tank through the filter membrane and be discharged from the discharge port.

[0014] By adopting the above technical scheme, the target crystals are suspended in the raw material solution and continue to grow. After reaching a certain crystal specification, they are settled at the bottom of the equipment through the filter membrane and discharged through the discharge port. The finished product is obtained through subsequent centrifugation, filtration, washing and other processes.

[0015] In some embodiments, the suspension crystallizer further comprises a second liquid inlet, which is arranged on the shell opposite to the cooling medium outlet.

[0016] By adopting the above technical scheme, the function of the second liquid inlet is to recover the solution of the back-end process. For example, the crystals discharged from the discharge port contain part of the raw material solution. After the subsequent centrifugation process, this part of the raw material solution is returned to the second liquid inlet and enters the suspension crystallizer again to repeat the crystallization to improve the yield of the product.

[0017] In some embodiments, the suspension crystallizer further comprises a temperature sensor interface. The temperature sensor interface is arranged on the top of the tank body and is used to install a temperature sensor for detecting the temperature of the raw material solution.

[0018] By adopting the above technical solution, the temperature sensor interface is used to install the sensor to monitor the temperature of the raw material solution inside the equipment so as to meet the temperature requirements for product crystallization and continued growth.

[0019] In some embodiments, the suspension crystallizer further comprises a liquid level gauge interface, which is disposed on the top of the tank body and is used to install a liquid level gauge to detect the liquid level in the first cavity.

[0020] With the above technical solution, the liquid level meter interface is used to install a liquid level sensor to monitor the liquid level of the raw material solution inside the equipment. When the raw material solution fills the tank, the feeding is stopped.

[0021] In some embodiments, a gap is provided between the blade and the inner wall of the tank.

[0022] By adopting the above technical solution, the gap between the scraper and the inner wall of the tank can be adjusted according to different types of product purification processes to meet the needs of different crystal sizes.

[0023] In some embodiments, the outside of the tank and the shell are both provided with thermal insulation devices.

[0024] By adopting the above technical solution, the outer shell of the suspension crystallizer, i.e. the tank body and the shell, must be subjected to heat insulation treatment to prevent the temperature of the external environment from causing uneven temperature inside the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional diagram of an embodiment of a suspension crystallizer of the utility model;

[0026] Figure 2 This is a structural schematic diagram of an embodiment of a suspension crystallizer of the utility model;

[0027] In the figure:

[0028] 1-suspension crystallizer; 2-tank body; 20-first cavity; 21-first liquid inlet; 22-discharge port; 3-water-cooled wall; 30-shell; 31-cooling medium inlet; 32-cooling medium inlet; 33-partitioning piece; 34-spiral flow channel; 4-peeling mechanism; 40-scraper; 41-blade; 42-starting motor; 43-rotating shaft; 44-retention gap; 50-filter membrane; 51-second liquid inlet; 52-temperature sensor interface; 53-liquid level meter interface. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0030] refer to Figure 1 and Figure 2 , Figure 1 A three-dimensional diagram of a suspension crystallizer 1 provided in an embodiment of the utility model is shown; Figure 2 A structural schematic diagram of a suspension crystallizer 1 provided in an embodiment of the utility model is shown.

[0031] like Figure 1 and Figure 2 As shown in the figure, a suspension crystallizer 1 provided by the present application is shown, comprising a tank body 2, a water-cooled wall 3 and a stripping mechanism 4, wherein the tank body 2 is axially ( Figure 1 The tank 2 is provided with a first liquid inlet 21 at the top and a material outlet 22 at the bottom. The first liquid inlet 21 and the material outlet 22 are both connected to the first cavity 20 for the raw material solution to flow in for purification. The water-cooled wall 3 includes a shell 30, a cooling medium inlet 31 and a cooling medium inlet. The shell 30 is circumferentially ( Figure 1 The stripping mechanism 4 includes a scraper 40 and a driving device. The scraper 40 is radially (shown in the θ direction) and is sleeved on the tank body 2 to form a second cavity with the tank body 2, and circumferentially surrounds the axial direction. The cooling medium inlet 31 and the cooling medium inlet are both connected to the second cavity, and are used to circulate the cooling medium so that the target crystals are precipitated from the raw material solution and attached to the inner wall of the tank body 2. Figure 1 The scraper 40 extends in the direction of λ in the middle, and one end is a blade 41, which is arranged facing the water-cooled wall 3 and is radially perpendicular to the axial direction. The scraper 40 can rotate in the circumferential direction, and is used to drive the blade 41 to rotate through the driving device to peel off the target crystal.

[0032] The suspension crystallizer 1 provided by the present application, the raw material solution enters the suspension crystallizer 1 from the first liquid inlet 21, after the feeding is completed, the cooling medium inlet is introduced into the cooling medium of the temperature required by the process, and the inner wall of the tank body 2 is cooled, and the target crystals in the raw material solution are crystallized and precipitated on the inner wall of the tank body 2 to form a crystal layer. When the crystal layer continues to grow and thicken, it is peeled off by rotating the scraper 40, and the target crystals further grow in the solution as crystal nuclei until they become large-particle crystals that meet production requirements. This solution utilizes temperature difference to precipitate the target crystals, does not need to introduce new solvents, and saves the environment. In addition, in addition to peeling the crystals on the inner wall of the equipment through circular motion, the scraper 40 also accelerates the disturbance of the fluid inside the crystallizer, enhances heat exchange, and makes the internal solution temperature more uniform, thereby obtaining crystals of consistent specifications.

[0033] In some embodiments, reference Figure 1 and Figure 2 The second cavity is provided with a partition 33 extending in an axial spiral direction to form a spiral flow channel 34. The cooling medium inlet 31 is provided at the bottom of the spiral flow channel 34, and the cooling medium outlet 32 ​​is provided at the top of the spiral flow channel 34.

[0034] Illustratively, the interior of the second cavity is processed into a flow channel form by a partition 33, and the cooling medium passes through the spiral flow channel 34 and finally flows out from the cooling medium discharge port 22. The entire flow process cools the inner wall of the suspension crystallizer 1 so that the temperature of the inner wall is maintained at the crystallization temperature of the product in the raw material solution to precipitate the target crystals.

[0035] In some embodiments, reference Figure 1 and Figure 2 The driving device is a starting motor 42. The starting motor 42 is arranged at the top of the tank body 2, and a rotating shaft 43 extending along the axial direction is arranged at the bottom. The rotating shaft 43 is arranged coaxially with the tank body 2. The rotating shaft 43 is arranged in the first cavity 20, and is used to connect the other end of the fixed scraper 40 along the radial direction.

[0036] Exemplarily, the rotating shaft 43 of the starting motor 42 drives the scraper 40 to make a circular motion. After the scraper 40 moves and the crystal layer thickness grows to a certain extent, the blade 41 of the scraper 40 can peel off the target crystals on the inner wall of the suspended crystallizer 1, so that a large number of crystals are suspended in the solution inside the equipment and continue to crystallize.

[0037] In some embodiments, reference Figure 1 and Figure 2 The suspension crystallizer 1 further includes a filter membrane 50. The filter membrane 50 is disposed on one side of the first cavity 20 near the discharge port 22 and connected to the bottom of the rotating shaft 43, and is used to separate the first cavity 20, and allows the target crystal to settle on the bottom of the tank 2 through the filter membrane 50 and be discharged from the discharge port 22.

[0038] Illustratively, the target crystals are suspended in the raw material solution and continue to grow. After reaching a certain crystal specification, they are settled to the bottom of the device through the filter membrane 50 and discharged through the discharge port 22. The finished product is obtained through subsequent processes such as centrifugation, filtration, and washing.

[0039] In some embodiments, reference Figure 1 and Figure 2 The suspension crystallizer 1 further includes a second liquid inlet 51. The second liquid inlet 51 is disposed in the housing 30 opposite to the cooling medium outlet 32.

[0040] Exemplarily, the function of the second liquid inlet 51 is to recover the solution of the back-end process. For example, the crystals discharged from the discharge port 22 contain part of the raw material solution. After the subsequent centrifugation process, this part of the raw material solution is returned to the second liquid inlet 51 and enters the suspension crystallizer 1 again to repeat the crystallization to improve the yield of the product.

[0041] In some embodiments, reference Figure 1 and Figure 2The suspension crystallizer 1 further comprises a temperature sensor interface 52. The temperature sensor interface 52 is arranged on the top of the tank body 2 and is used to install a temperature sensor for detecting the temperature of the raw material solution.

[0042] Exemplarily, the temperature sensor interface 52 is used to install a sensor to monitor the temperature of the raw material solution inside the device to meet the temperature requirements for product crystallization and continued growth.

[0043] In some embodiments, reference Figure 1 and Figure 2 The suspension crystallizer 1 further includes a liquid level meter interface 53 . The liquid level meter interface 53 is disposed on the top of the tank body 2 and is used to install a liquid level meter to detect the liquid level in the first cavity 20 .

[0044] Exemplarily, the liquid level meter interface 53 is used to install a liquid level sensor to monitor the liquid level of the raw material solution inside the equipment. When the raw material solution fills the tank body 2, the feeding is stopped.

[0045] In some embodiments, reference Figure 1 and Figure 2 A gap 44 is provided between the blade 41 and the inner wall of the tank body 2 .

[0046] For example, the gap 44 between the scraper 40 and the inner wall of the tank 2 can be adjusted according to different types of product purification processes to meet the needs of different crystal sizes.

[0047] In some embodiments, the outside of the tank body 2 and the shell 30 are both provided with thermal insulation devices.

[0048] Exemplarily, the outer shell of the suspension crystallizer 1, namely the tank 2 and the shell 30, need to be subjected to heat insulation treatment to prevent the temperature of the external environment from causing uneven temperature inside the equipment.

[0049] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A suspension crystallizer, characterized in that: include: The tank body extends axially and includes a first cavity; a first liquid inlet is provided at the top of the tank body, and a material outlet is provided at the bottom; the first liquid inlet and the material outlet are both connected to the first cavity, and are used for the raw material solution to flow in for purification; The water-cooled wall comprises a shell, a cooling medium inlet and a cooling medium inlet; the shell is sleeved on the tank body along the circumferential direction to form a second cavity with the tank body, and the circumferential direction surrounds the axial direction; the cooling medium inlet and the cooling medium inlet are both connected to the second cavity for circulating the cooling medium so that the target crystal is precipitated from the raw material solution and attached to the inner wall of the tank body; The stripping mechanism comprises a scraper and a driving device; the scraper extends radially, one end of which is a blade, the blade is arranged facing the water-cooled wall, and the radial direction is perpendicular to the axial direction; the scraper can rotate circumferentially, and is used to drive the blade to rotate through the driving device to strip the target crystal.

2. The suspension crystallizer according to claim 1, characterized in that: A partition extending in an axial spiral is provided in the second cavity to form a spiral flow channel; a cooling medium inlet is provided at the bottom of the spiral flow channel, and a cooling medium outlet is provided at the top of the spiral flow channel.

3. The suspension crystallizer according to claim 1, characterized in that: The driving device is a starting motor; the starting motor is arranged at the top of the tank body, and a rotating shaft extending axially is arranged at the bottom; the rotating shaft is arranged coaxially with the tank body; the rotating shaft is arranged in the first cavity and is used to connect the other end of the fixed scraper along the radial direction.

4. The suspension crystallizer according to claim 3, characterized in that: It also includes a filter membrane; the filter membrane is arranged on one side of the first cavity close to the discharge port and is connected to the bottom of the rotating shaft, which is used to separate the first cavity and allow the target crystal to settle at the bottom of the tank through the filter membrane and be discharged from the discharge port.

5. The suspension crystallizer according to claim 1, characterized in that: It also includes a second liquid inlet; the second liquid inlet is arranged on the shell body opposite to the cooling medium outlet.

6. The suspension crystallizer according to claim 1, characterized in that: It also includes a temperature sensor interface; the temperature sensor interface is arranged on the top of the tank body and is used to install a temperature sensor for detecting the temperature of the raw material solution.

7. The suspension crystallizer according to claim 1, characterized in that: It also includes a liquid level gauge interface; the liquid level gauge interface is arranged on the top of the tank body and is used to install a liquid level gauge to detect the liquid level height in the first cavity.

8. The suspension crystallizer according to claim 1, characterized in that: A reserved gap is arranged between the blade and the inner wall of the tank body.

9. The suspension crystallizer according to claim 1, characterized in that: The outside of the tank and the shell are both equipped with thermal insulation devices.

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