NMP (N-Methyl Pyrrolidone) solution purification device for lithium battery production
By designing a spiral heat exchange tube and a shaftless turbulence mechanism, the problems of uncontrollable temperature and sealed pressure relief in the NMP solution purification device were solved, achieving temperature-controllable heating and efficient distillation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN HUIZHU HENGSHENG TECH CO LTD
- Filing Date
- 2025-05-14
- Publication Date
- 2026-05-12
AI Technical Summary
Existing NMP solution purification equipment suffers from problems such as uncontrollable temperature during heating, leading to thermal decomposition and easy pressure leakage at the mechanical shaft seal.
It employs a spiral heat exchange tube and a shaftless turbulence mechanism, combined with jacket heating and circulating hot water temperature control to avoid local overheating. The piston block is driven by an electric push rod to achieve shaftless turbulence, replacing the traditional mechanical shaft to prevent pressure leakage.
It achieves controllable heating, avoids thermal decomposition and pressure leakage in the seal, and improves distillation efficiency and safety.
Smart Images
Figure CN224220757U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of NMP solution purification, specifically to an NMP solution purification device for lithium battery production. Background Technology
[0002] NMP (N-methylpyrrolidone) is a colorless, transparent, oily liquid with a slight amine odor. It has a melting point of -24.4℃, a boiling point of 203℃, and a flash point of 95℃. It exhibits low volatility and high thermal and chemical stability, making it widely used in the lithium battery manufacturing industry. Currently, the purification process for NMP solution uses vacuum distillation, which requires a distillation vessel. Existing distillation vessels are electrically heated, leading to uncontrollable temperature control and the potential for localized overheating. This can cause thermal decomposition during vacuum distillation, forming other products. Furthermore, existing distillation vessels use mechanical shafts for agitation, which can lead to pressure leaks at the seals of the mechanical shaft during vacuum distillation. Utility Model Content
[0003] To address the shortcomings of existing technologies, this invention provides an NMP solution purification device for lithium battery production.
[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0005] This utility model discloses an NMP solution purification device for lithium battery production, comprising a distillation tank, a top cover mounted on the top of the distillation tank, a steam outlet pipe on the top cover, a spiral heat exchange tube extending into the bottom of the inner cavity of the distillation tank mounted on the top cover via a fixing bracket, a first hot water inlet pipe and a first hot water outlet pipe connected to the two ends of the heat exchange tube on the top cover, a feed pipe on the top cover, a jacket on the outer side of the distillation tank, and a sandwich formed between the jacket and the outer wall of the distillation tank, a plurality of second hot water inlet pipes and second hot water outlet pipes communicating with the sandwich, the first hot water inlet pipe, the first hot water outlet pipe, the second hot water inlet pipe and the second hot water outlet pipe are connected to a hot water circulator via a heat-insulated conduit to form a hot water circulation circuit; and a shaftless turbulence-inducing mechanism is provided at the bottom of the distillation tank.
[0006] As a preferred embodiment of this invention, the inner wall of the distillation tank and the outer wall of the heat exchange tube are both coated with an anti-corrosion coating.
[0007] As a preferred embodiment of this utility model, both the first hot water inlet pipe and the second hot water inlet pipe are equipped with inlet water temperature sensors, and both the first hot water outlet pipe and the second hot water outlet pipe are equipped with outlet water temperature sensors.
[0008] As a preferred embodiment of this utility model, a sealing ring is provided between the distillation tank and the top cover, and a vacuum gauge is provided on the top cover for detecting the internal vacuum degree of the distillation tank.
[0009] As a preferred technical solution of this utility model, the shaftless turbulence mechanism includes an inclined guide tube disposed at the bottom of the distillation tank, a piston block that moves along the inner cavity of the guide tube, a sealing layer that seals the connection between the piston block and the guide tube on the periphery of the piston block, and an electric push rod that drives the piston block to reciprocate at the bottom of the distillation tank.
[0010] As a preferred embodiment of this utility model, the end of the catheter is provided with a guide tube.
[0011] The beneficial effects of this utility model are:
[0012] 1. This NMP solution purification device for lithium battery production has a spiral heat exchange tube installed on the top cover via a fixing bracket, extending into the bottom of the inner cavity of a distillation tank. The top cover has a first hot water inlet pipe and a first hot water outlet pipe connected to the two ends of the heat exchange tube. Circulating hot water is introduced into the heat exchange tube to achieve heating, and the temperature of the circulating hot water is easily controlled, preventing large fluctuations and thermal decomposition due to localized overheating. The heat exchange tube is integrated into the top cover for easy disassembly and cleaning. The spirally arranged heat exchange tube has a large heat exchange area, and a jacket is formed between the jacket and the outer wall of the distillation tank. Hot water is introduced into the jacket to heat the entire distillation tank, thus ensuring a large heat exchange area and high distillation efficiency. A shaftless turbulence mechanism is provided at the bottom of the distillation tank, eliminating the need for a traditional mechanical shaft and preventing pressure leakage at the seal.
[0013] 2. The NMP solution purification device for lithium battery production is equipped with inlet water temperature sensors on both the first hot water inlet pipe and the second hot water inlet pipe, and outlet water temperature sensors on both the first hot water outlet pipe and the second hot water outlet pipe. This allows for the detection of the outlet and inlet water temperatures of the circulating hot water, facilitating the control and adjustment of the water temperature.
[0014] 3. The NMP solution purification device for lithium battery production is equipped with a shaftless turbulence mechanism at the bottom of the distillation tank. The shaftless turbulence mechanism is driven by an electric push rod to move the piston block back and forth, which has the effect of suction and discharge at the bottom of the distillation pipe, thus achieving the effect of turbulence and stirring. This promotes the flow of NMP solution and ensures good heat exchange effect. Attached Figure Description
[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0016] Figure 1 This is a schematic diagram of the structure of an NMP solution purification device for lithium battery production according to this utility model;
[0017] Figure 2 This is a schematic diagram of the top cover structure d of an NMP solution purification device for lithium battery production according to this utility model;
[0018] Figure 3 This is a schematic diagram of the shaftless turbulence mechanism of an NMP solution purification device for lithium battery production according to this utility model.
[0019] In the diagram: 1. Distillation tank; 2. Top cover; 3. Steam outlet pipe; 4. Heat exchanger pipe; 5. First hot water inlet pipe; 6. First hot water outlet pipe; 8. Feed pipe; 9. Jacket; 10. Jacket layer; 11. Second hot water inlet pipe; 12. Second hot water outlet pipe; 16. Inlet water temperature sensor; 17. Outlet water temperature sensor; 18. Vacuum gauge; 19. Shaftless turbulence mechanism; 20. Conduit; 21. Piston block; 22. Sealing layer; 23. Electric push rod; 24. Guide pipe. Detailed Implementation
[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0021] Example: Figure 1 , Figure 2 , Figure 3As shown, this utility model discloses an NMP solution purification device for lithium battery production, comprising a distillation tank 1, a top cover 2 installed on the top of the distillation tank 1, a steam outlet pipe 3 provided on the top cover 2, a spiral heat exchange tube 4 extending into the bottom of the inner cavity of the distillation tank 1 and mounted on the top cover 2 via a fixing bracket, a first hot water inlet pipe 5 and a first hot water outlet pipe 6 connected to the two ends of the heat exchange tube 4 on the top cover 2, a feed pipe 8 provided on the top cover 2, a jacket 9 provided on the outer side of the distillation tank 1, and a jacket 10 formed between the jacket 9 and the outer wall of the distillation tank 1, a plurality of second hot water inlet pipes 11 and second hot water outlet pipes 12 connected to the jacket 10, the first hot water inlet pipe 5, the first hot water outlet pipe 6, the second hot water inlet pipe 11 and the second hot water outlet pipe 12 being connected to a hot water circulation machine 13 via a heat-insulated conduit to form a hot water circulation circuit; and a shaftless turbulence-inducing mechanism 19 provided at the bottom of the distillation tank 1. A spiral heat exchange tube 4, extending into the bottom of the inner cavity of the distillation tank 1, is installed on the top cover 2 via a fixing bracket. The top cover 2 is equipped with a first hot water inlet pipe 5 and a first hot water outlet pipe 6 connected to the two ends of the heat exchange tube 4. In this way, circulating hot water is introduced into the heat exchange tube 4 to achieve the heating effect. The temperature of the circulating hot water is easy to control and will not produce large fluctuations, thus avoiding thermal decomposition due to local overheating. Furthermore, the heat exchange tube 4 is integrated into the top cover 2, making it easy to disassemble and clean. The spiral heat exchange tube 4 has a large heat exchange area, and a jacket 10 is formed between the jacket and the outer wall of the distillation tank 1. Hot water is introduced into the jacket 10 to heat the entire distillation tank 1, thereby achieving a large heat exchange area and ensuring high distillation efficiency. A shaftless turbulence mechanism 19 is provided at the bottom of the distillation tank 1, which avoids the traditional mechanical shaft and prevents pressure leakage at the seal.
[0022] The inner wall of the distillation tank 1 and the outer wall of the heat exchange tube 4 are coated with an anti-corrosion coating 14, which serves to prevent corrosion.
[0023] The first hot water inlet pipe 5 and the second hot water inlet pipe are each equipped with an inlet water temperature sensor 16, and the first hot water outlet pipe 6 and the second hot water outlet pipe are each equipped with an outlet water temperature sensor 17. This allows for the detection of the outlet and inlet water temperatures of the circulating hot water, facilitating the control and adjustment of the water temperature.
[0024] The distillation vessel 1 is provided with a sealing ring between it and the top cover 2, and the top cover is provided with a vacuum gauge 18 for detecting the internal vacuum of the distillation vessel 1.
[0025] The shaftless turbulence mechanism 19 includes an inclined conduit 20 disposed at the bottom of the distillation tank 1. A piston block 21 that moves along the inner cavity of the conduit 20 is disposed inside the conduit 20. A sealing layer 22 is disposed around the piston block 21 to seal the connection between the piston block 21 and the conduit 20. An electric push rod 23 that drives the piston block to reciprocate is disposed at the bottom of the distillation tank 1. The shaftless turbulence mechanism 19 is disposed at the bottom of the distillation tank 1. The shaftless turbulence mechanism 19 drives the piston block 21 to reciprocate by the electric push rod 23. This has the effect of suction and discharge at the bottom of the distillation pipe, thereby achieving the effect of turbulence and stirring. This promotes the flow of NMP solution and ensures a good heat exchange effect.
[0026] The end of the conduit 20 is provided with a guide tube 24, which facilitates the flow of liquid pushed out of the piston block from the conduit to various places, thereby playing a good role in turbulence and agitation.
[0027] During operation, this NMP solution purification device for lithium battery production uses a spiral heat exchange tube 4, which extends into the bottom of the inner cavity of a distillation tank 1, mounted on a top cover 2 via a fixing bracket. The top cover 2 is equipped with a first hot water inlet pipe 5 and a first hot water outlet pipe 6 connected to the two ends of the heat exchange tube 4. Circulating hot water is introduced into the heat exchange tube 4 to achieve heating, and the temperature of the circulating hot water is easily controlled, preventing large fluctuations and thermal decomposition due to localized overheating. The heat exchange tube 4 is integrated into the top cover 2, facilitating disassembly and cleaning. The spirally arranged heat exchange tube 4 has a large heat exchange area, and a jacket 10 is formed between the jacket and the outer wall of the distillation tank 1. Hot water is introduced into the jacket 10 to heat the entire distillation tank 1, thus ensuring a large heat exchange area and high distillation efficiency. A shaftless turbulence mechanism 19 is provided at the bottom of the distillation tank 1, eliminating the need for a traditional mechanical shaft and preventing pressure leakage at the seal.
[0028] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An NMP solution purification apparatus for lithium battery production, characterized in that, The system includes a distillation tank (1), a top cover (2) mounted on the top of the distillation tank (1), a steam outlet pipe (3) on the top cover (2), a spiral heat exchange tube (4) extending into the bottom of the inner cavity of the distillation tank (1) mounted on the top cover (2) via a fixing bracket, a first hot water inlet pipe (5) and a first hot water outlet pipe (6) connected to the two ends of the heat exchange tube (4) on the top cover (2), a feed pipe (8) on the top cover (2), and a jacket (9) on the outer side of the distillation tank (1). The jacket (9) forms a jacket (10) with the outer wall of the distillation tank (1). The jacket is provided with a plurality of second hot water inlet pipes (11) and second hot water outlet pipes (12) that are connected to the jacket (10). The first hot water inlet pipe (5), the first hot water outlet pipe (6), the second hot water inlet pipe (11) and the second hot water outlet pipe (12) are connected to the hot water circulator (13) through heat-insulated conduits to form a hot water circulation circuit. The bottom of the distillation tank (1) is provided with a shaftless turbulence mechanism (19).
2. The NMP solution purification apparatus for lithium battery production according to claim 1, characterized in that, The inner wall of the distillation tank (1) and the outer wall of the heat exchange tube (4) are coated with an anti-corrosion coating.
3. The NMP solution purification apparatus for lithium battery production according to claim 1, characterized in that, The first hot water inlet pipe (5) and the second hot water inlet pipe are both equipped with inlet water temperature sensors (16), and the first hot water outlet pipe (6) and the second hot water outlet pipe are both equipped with outlet water temperature sensors (17).
4. The NMP solution purification apparatus for lithium battery production according to claim 1, characterized in that, A sealing ring is provided between the distillation tank (1) and the top cover (2), and a vacuum gauge (18) is provided on the top cover (2) for detecting the internal vacuum of the distillation tank (1).
5. The NMP solution purification apparatus for lithium battery production according to claim 1, characterized in that, The shaftless turbulence mechanism (19) includes an inclined conduit (20) disposed at the bottom of the distillation tank (1). A piston block (21) is disposed inside the conduit (20) and moves along the inner cavity of the conduit (20). A sealing layer (22) is disposed on the periphery of the piston block (21) to seal the connection between the piston block (21) and the conduit (20). An electric push rod (23) is disposed at the bottom of the distillation tank (1) to drive the piston block to reciprocate.
6. The NMP solution purification apparatus for lithium battery production according to claim 5, characterized in that, The end of the conduit (20) is provided with a guide tube (24).