Crystallization and purification device and method for ethylene carbonate
By adopting a multi-position fixing mechanism, the synergistic effect of airbags and pistons in the vinyl carbonate crystal purification device, and combining with intelligent control devices, the problems of complex operation and poor sealing performance of traditional devices are solved, and efficient and safe sampling and purity improvement are achieved.
Patent Information
- Application Number
- CN202411497797.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-05-06
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional vinyl carbonate crystal purification devices have problems such as complex operation, inconvenient sampling, poor sealing performance and high energy consumption, making it difficult to effectively deal with pressure changes during the reaction and improve product purity.
Using the multi-position fixing mechanism, the synergistic effect of airbags and pistons, combined with intelligent control devices, a vinyl carbonate crystal purification device is designed to achieve a flexible and safe sampling method and effectively control the pressure and material flow in the reactor.
It significantly improves the safety, reliability and efficiency of operation, avoids material leakage and artificial errors, improves crystallization purity, and reduces production costs and operation difficulty.
Smart Images
Figure CN119926313A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of chemical reaction equipment, in particular to a crystallization and purification device and method for ethylene carbonate. Background Art
[0002] In the chemical industry, ethylene carbonate, as an important organic compound, is widely used in electrolyte solvents, polymer materials, and pharmaceutical intermediates. In order to meet the market demand for high-purity products, the crystallization and purification process of ethylene carbonate is particularly important. However, traditional crystallization and purification methods often face many challenges during operation, such as complex operation, inconvenient sampling, poor sealing performance, and high energy consumption.
[0003] In the prior art, the design of the crystallization reactor is usually unable to effectively cope with the pressure changes generated during the reaction process, resulting in inaccurate sampling. In addition, traditional sampling devices often require more manual intervention, which increases the labor intensity of operators and may introduce human errors. At the same time, poor sealing or improper operation may lead to leakage of volatile substances, affecting the purity and safety of the product.
[0004] Therefore, the market needs an improved ethylene carbonate crystallization purification device, which should be able to adapt to different operating conditions, provide a flexible and safe sampling method, and be able to effectively control the pressure and material flow in the reactor to improve the crystal purity. In addition, the device should also have the characteristics of simple structure, easy operation and maintenance, so as to reduce production costs and improve production efficiency. Summary of the invention
[0005] The present invention proposes an innovative ethylene carbonate crystallization purification device and method thereof, which solves many problems existing in traditional devices through unique structural design and ingenious mechanical coordination. The device combines a multi-position fixing mechanism, the synergistic effect of an airbag and a piston, and an intelligent control device, which significantly improves the safety, reliability and efficiency of operation, and provides a strong guarantee for the production of high-purity ethylene carbonate.
[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a crystallization and purification device for ethylene carbonate, comprising: a crystallization reactor, the crystallization and purification device for ethylene carbonate also comprising: a base, the base is arranged on the outer wall of the crystallization reactor, the outer end surface of the base is provided with a groove, the bottom surface of the groove is provided with a first through hole and a second through hole, and they extend to the inner cavity of the crystallization reactor respectively; an insert is inserted into the groove, the inner cavity of the insert is provided with a placement groove and an air chamber, and the air chamber is provided with an air hole; a collecting device is arranged in the placement groove, and the first end of the collecting device corresponds to the first through hole, and the second end of the collecting device corresponds to the second through hole; a control device is arranged in the first through hole and is located in the inner cavity of the crystallization reactor; a top cap is arranged in the second through hole and is located in the inner cavity of the crystallization reactor; an auxiliary device is arranged on the outer wall of the crystallization reactor and abuts against the outer wall of the insert.
[0007] Preferably, the collecting device includes: a collecting tube, which is a U-shaped structure, the first end of the collecting tube corresponds to the first through hole, the second end of the collecting tube corresponds to the second through hole, the second end of the collecting tube is a closed end, and the second end of the collecting tube is an open end; a piston is installed in the inner cavity of the collecting tube; the first end of the gas tank is connected to the collecting tube and is close to the second end of the collecting tube; an air bag is arranged at the second end of the gas tank, and the air bag is located in the air chamber; a connecting tube is arranged at the first end of the collecting tube, a first inlet hole is opened on the outer wall of the connecting tube, and the outer diameter of the connecting tube is smaller than the outer diameter of the collecting tube; a top cover is arranged at the far end of the connecting tube from the collecting tube, and the outer diameter of the top cover is larger than the outer diameter of the connecting tube; a slip ring is sleeved on the outer wall of the connecting tube; a first spring is arranged on the outer wall of the connecting tube and is located between the top cover and the collecting tube.
[0008] Preferably, at least two protrusions are symmetrically arranged on the inner wall of the base, and a slot is opened at a corresponding position on the outer wall of the insert block.
[0009] Preferably, at least two protrusions are distributed along the extension direction of the groove, and the protrusions can generate elastic deformation.
[0010] Preferably, when the airbag is in a collapsed state, the volume of the airbag is smaller than the volume of the air chamber.
[0011] Preferably, the force generated when the airbag expands is greater than the resistance to the movement of the piston.
[0012] Preferably, the control device includes: a control tube, the first end of the control tube is arranged in the first through hole, the second end of the control tube is located in the crystallization reactor, the first end of the control tube is an open end, and the second end of the control tube is a closed end; a top block is slidably arranged in the inner cavity of the control tube; a second is arranged in the control tube and is located between the top block and the second end of the control tube; the second inlet is opened on the outer wall of the control tube; the third can only be opened on the outer wall of the control tube and is located on one side of the second inlet; the opening shapes of the second inlet and the third inlet are both irregular shapes.
[0013] Preferably, the distance between the first inlet hole and the second end of the control tube is greater than the distance between the second inlet hole and the second end of the control tube.
[0014] Preferably, the hole depth of the first inlet hole is smaller than the hole depth of the second inlet hole.
[0015] A crystallization and purification method for ethylene carbonate comprises the following steps: S1. Insert the plug into the groove and select the appropriate insertion depth according to the pressure in the crystallization reactor; S2. Keep the pores closed at all times during the insertion of the plug; S3. When the plug is inserted into a predetermined depth, the material in the crystallization reactor enters the collection tube by opening and closing the pores; S4. When the collected amount reaches the required amount, the pores are closed, and then the plug is pulled out to complete the sampling. The raw materials in the crystallization reactor 1 are adjusted according to the sample to improve the purity.
[0016] The present invention provides a crystallization and purification device and method for ethylene carbonate, which has the following beneficial effects: 1. When the plug is inserted into the groove of the base, the sealing between the plug and the base, and the sealing between the first end of the collecting tube and the control tube can prevent leakage of substances in the crystallization reactor during the sampling process, thereby preventing personnel from being injured.
[0017] 2. The present invention utilizes the second inlet and the third inlet to increase the pressure drop when the material in the crystallization reactor enters the control tube, greatly reducing the pressure in the control tube and further reducing the risk of leakage.
[0018] 3. The present invention utilizes the inflation and deflation of the airbag when the piston moves, so that the airbag is deformed in the air chamber. By controlling the closed state of the air chamber, the movement state of the piston is controlled. The operation is simple and the sampling amount can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the local structure of the present invention; Figure 3 It is the explosion schematic diagram of the present invention; Figure 4 It is a partial cross-sectional view of the present invention; Figure 5 It is a schematic diagram of the collecting device of the present invention; Figure 6 It is a cross-sectional view of the plug block of the present invention; Figure 7 It is a schematic diagram of the control device of the present invention; Figure 8A schematic diagram of the invention auxiliary device; Fig. 9 It is a side view of the plug block of the present invention.
[0020] In the figure: 1, crystallization reactor, 21, base, 22, groove, 23, protrusion, 31, plug, 32, placement groove, 33, air chamber, 34, air hole, 35, card slot, 36, observation window, 37, sealing plug, 4, collecting device, 41, collecting tube, 42, piston, 43, air pipe, 44, air bag, 45, connecting tube, 46, first inlet hole, 47, top cover, 48, slip ring, 49, first spring, 5, control device, 51, control tube, 52, top block, 53, second spring, 54, second inlet hole, 55, third inlet hole, 6, top cap, 7, auxiliary device, 71, first pressure rod, 72, second pressure rod, 73, first pressure plate, 74, second pressure plate, 75, first connecting rod, 76, second connecting rod, 77, sleeve, 78, card plate. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0022] See also Figure 1-8 The present invention provides a crystallization purification device and method technical solution for ethylene carbonate. The detailed connection means are well known in the art. The following mainly introduces the working principle and process. The specific work is as follows.
[0023] A crystallization and purification device for ethylene carbonate comprises: a crystallization reactor 1, a base 21, an insert 31, a collecting device 4, a control device 5, a top cap 6 and an auxiliary device 7. The base 21 is arranged on the outer wall of the crystallization reactor 1. The position of the base 21 varies according to different sampling requirements. Liquid phase sampling is usually performed in the lower part of the crystallization reactor 1, in the area below the liquid surface. Gas phase sampling is usually performed in the upper part of the crystallization reactor 1, in the gas phase space. Multiphase sampling may be performed in different locations in the crystallization reactor 1 when there are multiphase substances in the crystallization reactor 1. A plurality of sampling valves are arranged at a height to obtain samples at different levels. A groove 22 is provided on the outer end surface of the base 21. A first through hole and a second through hole are provided on the bottom surface of the groove 22, and the first through hole and the second through hole are respectively extended to the inner cavity of the crystallization reactor 1. The plug 31 is inserted into the groove 22. A placement groove 32 and an air chamber 33 are provided in the inner cavity of the plug hole. An observation window 36 is provided on the outer wall of the plug 31 to observe the position of the placement groove 32. The air chamber 33 is provided with an air hole 34, which is the only outlet position of the air chamber 33. A sealing plug is inserted into the air hole 34. 37, the opening and closing state of the pore 34 can be changed by plugging and pulling out the sealing plug 37, the shape of the plug block 31 matches the shape of the groove 22, and when the plug block 31 is inserted into the groove 22, the two are in a sealed state, the collecting device 4 is arranged in the placement groove 32, and the first end of the collecting device 4 corresponds to the first through hole, and the second end of the collecting device 4 corresponds to the second through hole, the collecting device 4 collects and stores the material in the crystallization reactor 1, the control device 5 is arranged in the first through hole, and is located in the inner cavity of the crystallization reactor 1, and the control device 5 can The connection state between the crystallization reactor 1 and the collecting device 4 is changed, the top cap 6 is arranged in the second through hole and located in the inner cavity of the crystallization reactor 1, the control device 5 is fixed by the first through hole and the second through hole, and at the same time, the second through hole of the top cap 6 and the inner cavity of the crystallization reactor 1 are in an isolated state, and the material in the crystallization reactor 1 can only be discharged from the first through hole, and the auxiliary device 7 is arranged on the outer wall of the crystallization reactor 1 and abuts against the outer wall of the plug block 31 to assist the plugging and pulling out of the plug block 31, thereby reducing the physical expenditure of the operator.
[0024] The collecting device 4 includes: a collecting tube 41, a piston 42, an air pipe 43, an air bag 44, a connecting tube 45, a first inlet hole 46, a top cover 47, a sliding ring 48 and a first spring 49. The collecting tube 41 is a U-shaped structure. The collecting tube 41 is made of a transparent material, and the sampling state can be known by observation. The first end of the collecting tube 41 corresponds to the first through hole, and the second end of the collecting tube 41 corresponds to the second through hole. The second end of the collecting tube 41 is a closed end, and the second end of the collecting tube 41 is an open end. The collecting tube 41 matches the placement slot 32, and the two ends of the collecting tube 41 can be plugged into the first through hole, respectively. The piston 42 is installed in the inner cavity of the collecting tube 41 in the first through hole and the second through hole. The piston 42 can move freely in the collecting tube 41. The sampling is realized by changing the position of the piston 42. When the piston 42 is at the first end of the collecting tube 41, it is in a non-sampling state. When the piston 42 is at the second end of the collecting tube 41, it is in a sampling state. The first end of the gas tank is connected to the collecting tube 41 and is close to the second end of the collecting tube 41. The part between the piston 42 and the first end of the collecting tube 41 is the sampled material, and the part between the piston 42 and the second end of the collecting tube 41 is gas or liquid. When the piston 42 is at the first end of the collecting tube 41, the sampled material is in the gas or liquid state. During the movement from one end to the second end, the gas or liquid between the piston 42 and the second end of the collecting tube 41 will be discharged from the collecting tube 41 through the air pipe 43. The air bag 44 is arranged at the second end of the gas tank, and the air bag 44 is located in the air chamber 33. The gas or liquid discharged from the air pipe 43 enters the air bag 44. The connecting pipe 45 is arranged at the first end of the collecting tube 41. The outer wall of the connecting pipe 45 is provided with a first inlet hole 46. The outer diameter of the connecting pipe 45 is smaller than the outer diameter of the collecting tube 41. The first inlet holes 46 are distributed on the outer wall of the connecting pipe 45 in a circular array. The top cover 47 is arranged at a distance of 1.5 meters from the connecting pipe 45. At the far end of the collecting tube 41, the outer diameter of the top cover 47 is larger than the outer diameter of the connecting tube 45, and the slip ring 48 is sleeved on the outer wall of the connecting tube 45. The slip ring 48 can slide freely on the connecting tube 45. When the slip ring 48 slides to abut against the top cover 47, the first inlet hole 46 is blocked by the slip ring 48 while maintaining a sealed state. The first inlet hole 46 is closed, and the first spring 49 is arranged on the outer wall of the connecting tube 45 and is located between the top cover 47 and the collecting tube 41. The first spring 49 is used to make the slip ring 48 always abut against the top cover 47 when no external force is applied, so that the first inlet hole 46 is in a closed state.
[0025] At least two protrusions 23 are symmetrically arranged on the inner wall of the base 21, and a slot 35 is opened at a corresponding position on the outer wall of the insert block 31. By utilizing the cooperation between the protrusion 23 and the slot 35, when the insert block 31 is inserted into the base 21, the limit position is maintained to achieve a fixing effect.
[0026] At least two protrusions 23 are distributed along the extension direction of the groove 22 , and the protrusions 23 can produce elastic deformation, so that the number of protrusions 23 can be increased, and when the inserting block 31 is inserted into the base 21 at different depths, the inserting block 31 can be fixed at multiple positions.
[0027] When the airbag 44 is in a collapsed state, the volume of the airbag 44 is smaller than the volume of the air chamber 33 . When the gas or liquid in the piston 42 and the second end of the collecting tube 41 enters the airbag 44 , the airbag 44 expands and gradually fills the air chamber 33 .
[0028] The force generated when the airbag 44 expands is greater than the resistance to the movement of the piston 42. When the first end of the collecting tube 41 is in an open state, that is, the first end of the collecting tube 41 is not inserted into the first through hole, the slip ring 48 is moved at the same time, and the first inlet hole 46 is in an open state. The pressure generated when the airbag 44 contracts from the expanded state can push the piston 42 from the second end of the collecting tube 41 to the first end of the collecting tube 41.
[0029] The control device 5 includes: a control tube 51, a top block 52, a second spring 53, a second inlet hole 54 and a third inlet hole 55. The first end of the control tube 51 is arranged in the first through hole, and the second end of the control tube 51 is located in the crystallization reactor 1. The first end of the control tube 51 is an open end, and the second end of the control tube 51 is a closed end. The inner wall of the control tube 51 is stepped. The inner diameter of the first end of the control tube 51 is greater than the inner diameter of the second end of the control tube 51. The inner diameter of the first end of the control tube 51 matches the outer diameter of the slip ring 48. The slip ring 48 will be stuck when it moves to the diameter change position of the control tube 51. At the same time, the first end of the collecting tube 41 can continue to move toward the second end of the control tube 51, so that the slip ring 48 and the connecting tube 45 generate relative movement, the top block 52 is slidably arranged in the inner cavity of the control tube 51, and the top block 52 can only slide within the range of the control tube 51, the second is arranged in the control tube 51, and is located between the top block 52 and the second end of the control tube 51, the second spring 53 makes the top block 52 always have a tendency to move toward the first end of the control tube 51 only under the action of the elastic force of the second spring 53, the second inlet hole 54 is opened on the outer wall of the control tube 51, and the third can only be opened on the outer wall of the control tube 51 and is located on one side of the second inlet hole 54, and under the action of the second spring 53, the top block 52 makes the second inlet hole 54 and the third inlet hole 55 in a closed state.
[0030] The opening shapes of the second inlet 54 and the third inlet 55 are both irregular, which may cause greater turbulence when the fluid passes through, increase energy loss, and further increase pressure drop. The irregular shape may also cause uneven fluid flow, further increasing flow resistance.
[0031] The distance between the first inlet hole 46 and the second end of the control tube 51 is greater than the distance between the second inlet hole 54 and the second end of the control tube 51 .
[0032] The hole depth of the first inlet hole 46 is smaller than that of the second inlet hole 54. Increasing the hole depth increases the path length of the fluid passing through the control tube 51. A larger hole depth means that the fluid needs to pass through a longer throttling channel, which increases friction loss and leads to a greater pressure drop. Two inlet holes with different hole depths are used to cope with different pressures in the crystallization reactor 1.
[0033] The auxiliary device 7 includes: a first pressure rod 71, a second pressure rod 72, a first pressure plate 73, a second pressure plate 74, a first connecting rod 75, a second connecting rod 76, a sleeve 77 and a clamping plate 78. The first pressure rod 71 and the second pressure rod 72 have the same shape and are mirror-imaged. The first end of the first pressure rod 71 and the first end of the second pressure rod 72 are respectively connected to the outer wall of the crystallization reactor 1. The first pressure plate 73 is hinged to the middle part of the first pressure rod 71, and the second pressure plate 74 is hinged to the middle part of the second pressure rod 72. The first pressure plate 73 and the second pressure plate 74 are respectively attached to the outer wall of the plug block 31. The first pressure plate 73 is located above the air hole 34. At the same time, the sealing plug 37 is connected to the first pressure plate 73 in a clamping connection relationship and can be connected by pressing. The lifting action of the first pressure plate 73 can be used to pull the sealing plug 37 out of the air hole 34. At the same time, the operator can separate the sealing plug 37 and the first pressure plate 73 by external force. The rod 75 and the second connecting rod 76 are respectively arranged at the second ends of the first pressure rod 71 and the second pressure rod 72. The first connecting rod 75 and the second connecting rod 76 have the same outer diameter and are located between the first pressure rod 71 and the second pressure rod 72. The two ends of the sleeve 77 are respectively sleeved between the first connecting rod 75 and the second connecting rod 76. Through the connection of the sleeve 77, when an external force is applied to one of the first connecting rod 75 and the second connecting rod 76, the first pressure rod 71 and the second pressure rod 72 will move as a whole. By removing the sleeve 77 from one of the first connecting rod 75 and the second connecting rod 76, the first pressure rod 71 and the second pressure rod 72 can be used independently. The first end of the clamping plate 78 is hinged on the outer wall of the plug block 31, and the second end of the clamping plate 78 can be clamped on the second pressure plate 74. When the plug block 31 is pulled out of the base 21, the clamping plate 78 can be clamped on the second pressure plate 74. At this time, the plug block 31 can be pulled out by lifting the second pressure rod 72.
[0034] A crystallization and purification method for ethylene carbonate comprises the following steps: S1. Insert the plug 31 into the groove 22 and select a suitable insertion depth according to the pressure in the crystallization reactor 1; S2. During the insertion of the plug 31, the pore 34 is always kept closed; S3. When the plug 31 is inserted into a predetermined depth, the material in the crystallization reactor 1 enters the collection tube 41 by opening and closing the pores 34; S4. When the collected amount reaches the required amount, the pore 34 is closed, and then the plug 31 is pulled out to complete the sampling. The raw material in the crystallization reactor 1 is adjusted according to the sample to improve the purity.
[0035] Working principle: In the initial state, the top block 52 is located near the first end of the control tube 51, the second inlet hole 54 and the third inlet hole 55 are in a closed state, the slip ring 48 is in a state of abutting the top cover 47, the first inlet hole 46 is in a closed state, the piston 42 is located near the first end of the collection tube 41, and the air bag 44 is in a deflated state; at this time, sampling begins, first aligning the plug block 31 with the groove 22 and preliminarily inserting it, and selecting a suitable depth according to the reaction state, that is, according to the pressure state in the tube. If the pressure in the tube is large, the insertion depth is deep, and if the pressure is small, the insertion depth is shallow, and the first pressing plate 73 and the second pressing plate 74 are respectively abutted against the plug The outer wall of the block 31, the sealing plug 37 and the first pressure plate 73 are in a clamping state, and the plug block 31 is slowly inserted into the base 21 by pressing the second ends of the first pressure rod 71 and the second pressure rod 72 downwards. The insertion depth of the plug block 31 is controlled according to the touch of the moment when the protrusion 23 and the card slot 35 are clamped; when the slip ring 48 is clamped at the variable diameter position of the control tube 51, as the collecting tube 41 continues to be inserted, the top cover 47 abuts against the end of the top block 52, the first spring 49 and the second spring 53 are both compressed, and the first inlet hole 46 is in an open state. According to the insertion depth, the first inlet hole 46 corresponds to the second inlet hole 54 and the third inlet hole 55 respectively, so as to realize The material in the crystallization reactor 1 enters the first inlet hole 46 from the second inlet hole 54, or enters the first inlet hole 46 from the third inlet hole 55, so as to achieve different pressure injection. At this time, the sleeve 77 can be moved to allow the first pressure rod 71 and the second pressure rod 72 to move independently. At this time, the first pressure rod 71 is lifted to allow the first pressure plate 73 to drive the sealing plug 37 to be pulled out, and the air hole 34 is in an open state. Under the pressure in the crystallization reactor 1, the material in the crystallization reactor 1 enters the collecting tube 41. At the same time, the piston 42 moves from the first end to the second end of the collecting tube 41, and the air bag 44 gradually expands. The sampling amount can be observed through the observation window 36. If it reaches The required sampling amount is obtained by moving the first pressure rod 71 in the opposite direction so that the sealing plug 37 closes the air hole 34. Since the air chamber 33 is closed, the airbag 44 cannot continue to expand, thereby controlling the continued movement of the piston 42. At this time, the clamping plate 78 is clamped on the outer wall of the second pressure plate 74, and the second pressure rod 72 is moved in the opposite direction to slowly pull the plug 31 out of the base 21. During the process of pulling out the plug 31, the elastic force of the first spring 49 and the second spring 53 is used to restore the top ring and the sliding ring 48 to their original positions, and the first inlet hole 46, the second inlet hole 54 and the third inlet hole 55 are respectively closed to complete the sampling. The raw materials in the crystallization reactor 1 are adjusted according to the sample to improve the purity.
[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A crystallization and purification device for ethylene carbonate, comprising: The crystallization reaction kettle (1) is characterized in that the crystallization and purification device for ethylene carbonate further comprises: A base (21), the base (21) being arranged on the outer wall of the crystallization reaction kettle (1), the outer end surface of the base (21) being provided with a groove (22), the bottom surface of the groove (22) being provided with a first through hole and a second through hole, which respectively extend to the inner cavity of the crystallization reaction kettle (1); An insert block (31), the insert block (31) is inserted into the groove (22), the inner cavity of the insert hole is provided with a placement groove (32) and an air chamber (33), and the air chamber (33) is provided with an air hole (34); A collecting device (4), the collecting device (4) being arranged in the placement groove (32), and the first end of the collecting device (4) corresponding to the first through hole, and the second end of the collecting device (4) corresponding to the second through hole; A control device (5), wherein the control device (5) is arranged in the first through hole and located in the inner cavity of the crystallization reaction kettle (1); A top cap (6), wherein the top cap (6) is arranged in the second through hole and is located in the inner cavity of the crystallization reaction kettle (1); An auxiliary device (7), wherein the auxiliary device (7) is arranged on the outer wall of the crystallization reaction kettle (1) and abuts against the outer wall of the insert block (31); The collecting device (4) comprises: A collecting tube (41), the collecting tube (41) being of a U-shaped structure, the first end of the collecting tube (41) corresponding to the first through hole, the second end of the collecting tube (41) corresponding to the second through hole, the second end of the collecting tube (41) being a closed end, and the first end of the collecting tube (41) being an open end; A piston (42), wherein the piston (42) is installed in the inner cavity of the collecting tube (41); An air pipe (43), wherein the first end of the air tank is connected to the collecting pipe (41) and is close to the second end of the collecting pipe (41); An air bag (44), the air bag (44) being arranged at the second end of the gas tank, and the air bag (44) being located in the air chamber (33); a connecting pipe (45), the connecting pipe (45) being arranged at a first end of the collecting pipe (41), the outer wall of the connecting pipe (45) being provided with a first inlet hole (46), and the outer diameter of the connecting pipe (45) being smaller than the outer diameter of the collecting pipe (41); A top cover (47), the top cover (47) being arranged at a distal end of the connecting pipe (45) away from the collecting pipe (41), and the outer diameter of the top cover (47) being greater than the outer diameter of the connecting pipe (45); A slip ring (48), wherein the slip ring (48) is sleeved on the outer wall of the connecting pipe (45); A first spring (49), wherein the first spring (49) is arranged on the outer wall of the connecting pipe (45) and is located between the top cover (47) and the collecting pipe (41).
2. A crystallization and purification device for ethylene carbonate according to claim 1, characterized in that: At least two protrusions (23) are symmetrically arranged on the inner wall of the base (21), and a slot (35) is provided at a corresponding position on the outer wall of the insert block (31).
3. A crystallization and purification device for ethylene carbonate according to claim 2, characterized in that: The at least two protrusions (23) are distributed along the extension direction of the groove (22), and the protrusions (23) can generate elastic deformation.
4. A crystallization and purification device for ethylene carbonate according to claim 3, characterized in that: When the airbag (44) is in a collapsed state, the volume of the airbag (44) is smaller than the volume of the air chamber (33).
5. A crystallization and purification device for ethylene carbonate according to claim 4, characterized in that: The force generated by the air bag (44) when it expands is greater than the resistance to the movement of the piston (42).
6. A crystallization and purification device for ethylene carbonate according to claim 5, characterized in that: The control device (5) comprises: A control tube (51), wherein the first end of the control tube (51) is disposed in the first through hole, the second end of the control tube (51) is located in the crystallization reaction kettle (1), the first end of the control tube (51) is an open end, and the second end of the control tube (51) is a closed end; A top block (52), wherein the top block (52) is slidably disposed in the inner cavity of the control tube (51); a second spring (53), the second spring being arranged in the control tube (51) and being located between the top block (52) and the second end of the control tube (51); A second inlet hole (54), wherein the second inlet hole (54) is formed on the outer wall of the control tube (51); A third inlet hole (55) is provided on the outer wall of the control tube (51) and is located on one side of the second inlet hole (54).
7. A crystallization and purification device for ethylene carbonate according to claim 6, characterized in that: The opening shapes of the second inlet hole (54) and the third inlet hole (55) are both irregular shapes.
8. A crystallization and purification device for ethylene carbonate according to claim 7, characterized in that: The distance between the first inlet hole (46) and the second end of the control tube (51) is greater than the distance between the second inlet hole (54) and the second end of the control tube (51).
9. A crystallization and purification device for ethylene carbonate according to claim 8, characterized in that: The hole depth of the first inlet hole (46) is smaller than the hole depth of the second inlet hole (54).
10. A method for crystallizing and purifying ethylene carbonate, which is applied to the device for crystallizing and purifying ethylene carbonate as claimed in claim 9, characterized in that: The steps include: S1. Insert the plug (31) into the groove (22) and select a suitable insertion depth according to the pressure in the crystallization reactor (1); S2. During the insertion of the plug (31), the pore (34) is always kept closed; S3. When the plug (31) is inserted to a predetermined depth, the material in the crystallization reactor (1) enters the collection tube (41) by controlling the opening and closing of the pores (34); S4. When the collected amount reaches the required amount, the pore (34) is closed, and then the plug (31) is pulled out to complete the sampling. The raw materials in the crystallization reactor (1) are adjusted according to the sample to improve the purity.