NMP recovery and refining equipment for lithium battery production

Abstract

The utility model discloses a kind of NMP recovery refining equipment for lithium battery production, including rectifying column body, still include spraying mechanism, by the rectifying column of the NMP recovery refining equipment for lithium battery production in existing patent technology is improved and set spraying mechanism, after spraying liquid enters ball barrel through the L-shaped bend of spraying mechanism, on one hand, it is transported to annular distribution's inner supply ring box through cross pipe, on the other hand, it is introduced into receiving tube vertically through throat pipe, taper expansion pipe, then two-way liquid is converged in six groups annular distribution's L-shaped six branch pipes and carries out double-path uniform sufficient liquid supply, cooperate the dense array spray of the spiral nozzle under each group branch pipe of L-shaped six branch pipe, improve the gas-liquid contact area in rectifying column body, significantly enhance the mass transfer efficiency of NMP and impurity in gas phase, improve NMP recovery rate.

Description

Technical Field

[0001] This utility model relates to the field of NMP recycling and refining technology, and in particular to an NMP recycling and refining device for lithium battery production. Background Technology

[0002] Methylpyrrolidone (NMP) is also known as First pyrrolidone or methyl Pyrrolidone (NMP) is a colorless, transparent, oily, weakly alkaline liquid with a slight amine odor. It has a high boiling point (203°C), strong polarity, good solubility, low volatility, low toxicity, and stable chemical properties. It is miscible with most organic solvents and is mainly used in many industries such as petrochemicals, plastics, pharmaceuticals, pesticides, dyes, and lithium-ion battery manufacturing. The NMP recovery liquid in the lithium battery production process contains water, particulate matter, metal ions, free amines, and heavy components. It needs to be refined and purified to an NMP content of not less than 99.9% and meet other indicators before it can be reused in production.

[0003] Application No. CN202320997215.X discloses an NMP recycling and refining device for lithium battery production. This utility model can solve the problems of poor dehydration effect, unstable product quality, high equipment and maintenance costs, and complex control system of traditional NMP distillation system.

[0004] In existing patented technologies, NMP is usually recovered and purified using a distillation column. This type of distillation column uses a cross-shaped spray structure for gas-liquid contact during NMP recovery and purification. However, the uniformity of the spray liquid supply in this simple spray structure is limited, which cannot guarantee the uniformity of the spray liquid at the spray structure inside the distillation column, thus affecting the gas-liquid contact effect during NMP recovery and purification. Therefore, we propose an NMP recovery and purification device for lithium battery production. Utility Model Content

[0005] The main objective of this invention is to provide an NMP recovery and refining device for lithium battery production. By improving the distillation column of existing patented NMP recovery and refining devices for lithium battery production with a spray mechanism, the spray liquid enters the spherical cylinder through the L-shaped bend in the spray mechanism. On one hand, it is transported to the annularly distributed inner supply ring box through a cross-connecting pipe; on the other hand, it is vertically introduced into the receiving cylinder through a throat pipe and a tapered expansion pipe. Then, the two liquid paths are longitudinally split within six sets of annularly distributed L-shaped six-point pipes, achieving a dual-path liquid supply mode. This allows the spray liquid to form a bidirectional counter-current mixing within the L-shaped six-point pipes. Combined with the dense array of spiral nozzles below each set of branch pipes, the gas-liquid contact area within the distillation column is increased, significantly enhancing the mass transfer efficiency between NMP and impurities in the gas phase, thereby improving the NMP recovery rate and effectively solving the problems in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A NMP recycling and refining device for lithium battery production includes a distillation column body and a spraying mechanism. The spraying mechanism includes an inner supply ring box, a vertical mounting plate, a cross-shaped connecting pipe, a ball cylinder, an L-shaped bend in the pipe, a throat, a tapered expansion pipe, a connecting cylinder, an L-shaped six-point pipe, and spiral nozzles. The inner supply ring box is installed inside the spraying section of the distillation column body via the vertical mounting plate. A ball cylinder is welded to the ring opening of the inner supply ring box via the cross-shaped connecting pipe. The upper opening of the ball cylinder is welded with... An L-shaped bend is welded to the flange of the distillation column body, and the pipe body of the L-shaped bend is welded and fixed to the insertion position of the distillation column body. The bottom of the spherical body of the spherical cylinder is welded with a tapered expansion pipe through a throat pipe, and a connecting sleeve is welded to the lower pipe opening of the tapered expansion pipe. An L-shaped six-point pipe is welded to the outside of the vertical cylinder wall of the connecting sleeve, and a vertical spray pipe communicating with its own cavity is arranged and welded below the straight pipe body of the L-shaped six-point pipe. A spiral nozzle is screwed into the bottom pipe opening of the vertical spray pipe.

[0008] Furthermore, a vertical mounting plate is welded at three points on the outer wall of the inner supply ring box, and an installation hole for screw bolts is opened between the plate body of the vertical mounting plate and the inner wall of the distillation column body.

[0009] By adopting the above technical solution, the vertical mounting plate of the inner supply ring box can be installed by bolting it to the inner wall of the distillation column body.

[0010] Furthermore, the annular cavity of the inner supply ring box is interconnected with the cavity of the cross connecting tube, and the four sets of tubes of the cross connecting tube are cross-welded and interconnected at the ball cylinder.

[0011] By adopting the above technical solution, after the inner supply ring box is connected to the ball cylinder through the cross-shaped connecting pipe, the spray liquid entering from the ball cylinder can enter the inner supply ring box along the cross-shaped connecting pipe.

[0012] Furthermore, the L-shaped six-point pipe has six sets of pipes welded in a ring on the outer wall of the vertical cylinder of the receiving cylinder, and six sets of pipe bodies with bottom embedded pipes are welded to each other below the inner supply ring box above the L-shaped six-point pipe. The six sets of pipe bodies with bottom embedded pipes are inserted and welded to the vertical pipe body of the L-shaped six-point pipe.

[0013] By adopting the above technical solution, the receiving tube can receive the bottom embedded tube below the inner supply ring box with six sets of L-shaped six-point pipes for insertion and welding. When the spray liquid at the ball tube enters the receiving tube along the throat and tapered expansion tube, the receiving tube can send the spray liquid through the pipe body of the L-shaped six-point pipe and the vertical spray pipe to the spiral nozzle for spraying.

[0014] Furthermore, three sets of pipes with vertical spray pipes are arranged and welded below each straight pipe section away from the receiving cylinder of the L-shaped six-point pipe, and a spiral nozzle is screwed into the threaded bottom pipe opening of the vertical spray pipe.

[0015] By adopting the above technical solution, multiple sets of pipes of the vertical spray pipe can be screwed and installed with spiral nozzles below the L-shaped six-point pipe, thereby ensuring that the L-shaped six-point pipe can spray spray liquid downwards.

[0016] Furthermore, a straight tube with a tapered expansion tube welded to it is inserted into the opening of the receiving tube, and the tapered tubes that gradually taper upwards are interconnected and welded at the bottom of the ball tube through a throat tube.

[0017] By adopting the above technical solution, the connecting tube can be connected to the ball tube by welding with the tapered expansion tube and the throat tube, which facilitates the entry of the spray liquid into the connecting tube.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention improves the distillation column of existing patented NMP recovery and refining equipment used in lithium battery production by adding a spray mechanism. After the spray liquid enters the spherical cylinder through the L-shaped bend of the spray mechanism, it is transported to the annularly distributed inner supply ring box through the cross connecting pipe, and vertically introduced into the receiving cylinder through the throat pipe and tapered expansion pipe. Then, the two liquids are longitudinally split in six sets of annularly distributed L-shaped six-point pipes to achieve a dual-path liquid supply mode. This allows the spray liquid to form a bidirectional counter-current mixing in the L-shaped six-point pipes. Combined with the dense array of spiral nozzles below each set of branch pipes, the gas-liquid contact area in the distillation column body is increased, significantly enhancing the mass transfer efficiency between NMP and impurities in the gas phase, and improving the NMP recovery rate.

[0020] Furthermore, the ball tube, as a central buffer chamber, can absorb upstream liquid supply pressure fluctuations. The constriction design of the throat tube, combined with the gradual expansion structure of the tapered expansion tube, utilizes the Venturi effect to balance the flow velocity and improve the uniformity of liquid supply in the L-shaped six-point tube. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the refining tower and spraying mechanism of an NMP recycling and refining equipment for lithium battery production according to this utility model.

[0022] Figure 2 This diagram illustrates the installation position of the spray mechanism in an NMP recycling and refining equipment for lithium battery production, according to this utility model.

[0023] Figure 3 This is an exploded view of the spray mechanism of an NMP recycling and refining equipment for lithium battery production according to this utility model.

[0024] In the diagram: 1. Distillation column body; 2. Spraying mechanism; 3. Inner supply ring box; 4. Vertical mounting plate; 5. Cross connecting pipe; 6. Ball cylinder; 7. L-shaped bend inlet pipe; 8. Throat pipe; 9. Tapered expansion pipe; 10. Connecting cylinder; 11. L-shaped six-point pipe; 12. Bottom embedded pipe; 13. Vertical spray pipe; 14. Spiral nozzle. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] like Figure 1-3 As shown, an NMP recycling and refining device for lithium battery production includes a distillation column body 1 and a spray mechanism 2. The spray mechanism 2 includes an inner supply ring box 3, a vertical mounting plate 4, a cross-shaped connecting pipe 5, a ball cylinder 6, an L-shaped bend pipe 7, a throat pipe 8, a tapered expansion pipe 9, a connecting cylinder 10, an L-shaped six-point pipe 11, and a spiral nozzle 14. The inner supply ring box 3 is installed inside the spray section of the distillation column body 1 through the vertical mounting plate 4, and the ball cylinder 6 is welded to the ring opening of the inner supply ring box 3 through the cross-shaped connecting pipe 5. The upper opening of the ball cylinder 6 is welded to the inner supply ring box 3. An L-shaped bend pipe 7 is connected to the distillation column body 1 and welded to the flange. The pipe body of the L-shaped bend pipe 7 is welded and fixed to the insertion position of the distillation column body 1. The bottom of the spherical body of the spherical cylinder 6 is interconnected with a tapered expansion pipe 9 through a throat pipe 8. The lower opening of the tapered expansion pipe 9 is interconnected with a connecting sleeve 10. An L-shaped six-point pipe 11 is welded to the outside of the vertical cylinder wall of the connecting sleeve 10. A vertical spray pipe 13 communicating with its own cavity is arranged and welded below the straight pipe body of the L-shaped six-point pipe 11. A spiral nozzle 14 is screwed into the bottom opening of the vertical spray pipe 13.

[0027] Among them, the inner supply ring box 3 has a vertical plate 4 welded at three points on the outer box wall, and the plate of the vertical plate 4 and the inner tower wall of the distillation column body 1 are provided with mounting holes for screw bolts.

[0028] By adopting the above technical solution, the vertical mounting plate 4 of the inner supply ring box 3 can be installed by bolting it to the inner wall of the distillation column body 1.

[0029] The annular cavity of the inner supply ring box 3 is interconnected with the cavity of the cross connecting pipe 5, and the four sets of pipes of the cross connecting pipe 5 are cross-welded and interconnected at the ball cylinder 6.

[0030] By adopting the above technical solution, after the inner supply ring box 3 is interconnected with the ball cylinder 6 via the cross pipe 5, the spray liquid entering from the ball cylinder 6 can enter the inner supply ring box 3 along the cross pipe 5.

[0031] Among them, the L-shaped six-point pipe 11 is welded in six groups in a ring on the outside of the vertical cylinder wall of the receiving cylinder 10, and the six groups of bottom embedded pipe 12 are interconnected and welded below the inner supply ring box 3 above the L-shaped six-point pipe 11. The six groups of bottom embedded pipe 12 are inserted and welded to the vertical pipe body of the L-shaped six-point pipe 11.

[0032] By adopting the above technical solution, the receiving tube 10 can receive the bottom embedded tube 12 below the inner supply ring box 3 with six sets of L-shaped six-point pipes 11 for insertion welding, so that when the spray liquid at the ball tube 6 enters the receiving tube 10 along the throat pipe 8 and the tapered expansion pipe 9, the receiving tube 10 can send the spray liquid through the pipe body of the L-shaped six-point pipe 11 and the vertical spray pipe 13 into the spiral nozzle 14 for spraying.

[0033] Among them, three sets of pipe bodies of vertical spray pipe 13 are arranged and welded below each straight pipe body of the L-shaped six-point pipe 11 away from the connecting cylinder 10, and a spiral nozzle 14 is screwed into the threaded bottom pipe opening of the vertical spray pipe 13.

[0034] By adopting the above technical solution, the multiple sets of pipes of the vertical spray pipe 13 can be screwed and installed with spiral nozzles 14 below the L-shaped six-point pipe 11, thereby ensuring that the L-shaped six-point pipe 11 can spray spray liquid downward.

[0035] In this process, a straight tube body with a tapered expansion tube 9 welded to it is inserted into the opening of the receiving tube 10, and the tapered tube body that gradually narrows upward through the tapered expansion tube 9 is interconnected and welded to the bottom of the ball tube 6 through the throat tube 8.

[0036] By adopting the above technical solution, the connecting tube 10 can be connected to the ball tube 6 by means of the tapered expansion tube 9 and the throat tube 8, so that the spray liquid can easily enter the connecting tube 10.

[0037] It should be noted that this utility model is an NMP recycling and refining equipment for lithium battery production. It improves upon existing patented NMP recycling and refining equipment by adding a spray mechanism 2 to the distillation column. The spray mechanism 2 is installed within the spray column section of the distillation column body 1. After the vertical plate 4 of the inner supply ring box 3 of the spray mechanism 2 is attached to the inside of the distillation column body 1, it can be locked in place by bolts. The L-shaped six-point pipe 11 is welded to the bottom embedded pipe 12 below the inner supply ring box 3. The connecting cylinder 10 is interconnected with the ball cylinder 6 via a tapered expansion cylinder 9 and a throat pipe 8. The upper opening of the ball cylinder 6 can pass through the welded flange of the distillation column body 1 via an L-shaped bend pipe 7, allowing the L-shaped bend pipe 7 to be flange-connected to a pipe supplying pressurized spray liquid. Simultaneously, the spiral nozzle 14 can be screwed onto the lower part of the vertical spray pipe 13. When the absorption tower in the existing patented technology absorbs NMP... When the NMP solution of P is transported to the distillation column body 1 for distillation, the L-shaped bend pipe 7 can send the spray liquid into the sphere 6. The liquid in the sphere 6 first enters the inner supply ring box 3 through the cross connecting pipe 5. At the same time, the liquid in the sphere 6 can also enter the receiving cylinder 10 through the small diameter throat pipe 8 and the tapered expansion pipe 9. The bottom embedded pipe 12 of the inner supply ring box 3 and the receiving cylinder 10 can be connected to the L-shaped six-point pipe 11 at both ends to ensure that the spray liquid can be evenly injected into the L-shaped six-point pipe 11. Then the spray liquid can enter the spiral nozzle 14 through the vertical spray pipe 13 and spray downward. There are many spiral nozzles 14 at the bottom of the six-point pipe body of the L-shaped six-point pipe 11, which can better spray the spray liquid into the distillation column body 1, ensuring the gas-liquid contact effect during NMP recovery and purification, and improving the treatment effect of the distillation column body 1 on NMP recovery and purification. After the distillation column body 1 processes the NMP liquid, it can be discharged and sent to the next equipment for further processing.

[0038] It should be noted that this utility model is an NMP recycling and refining device for lithium battery production. All components in this utility model are known to those skilled in the art, and their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An NMP recovery refining device for lithium battery production, comprising a rectifying tower body (1), characterized in that: It also includes a spraying mechanism (2), which includes an inner supply ring box (3), a vertical plate (4), a cross-shaped connecting pipe (5), a ball cylinder (6), an L-shaped bend pipe (7), a throat pipe (8), a tapered expansion pipe (9), a connecting cylinder (10), an L-shaped six-point pipe (11), and a spiral nozzle (14). The inner supply ring box (3) is installed in the spraying section of the distillation column body (1) through the vertical plate (4), and the ball cylinder (6) is welded to the ring opening of the inner supply ring box (3) through the cross-shaped connecting pipe (5). The upper opening of the ball cylinder (6) is welded to the ball cylinder body (1). An L-shaped bend pipe (7) is welded to the flange, and the pipe body of the L-shaped bend pipe (7) is welded and fixed to the insertion position of the distillation column body (1). The bottom of the spherical body of the ball cylinder (6) is welded with a tapered expansion pipe (9) through the throat pipe (8), and a connecting sleeve (10) is welded to the lower pipe opening of the tapered expansion pipe (9). An L-shaped six-point pipe (11) is welded to the outside of the vertical cylinder wall of the connecting sleeve (10), and a vertical spray pipe (13) that communicates with its own cavity is arranged and welded below the straight pipe body of the L-shaped six-point pipe (11). A spiral nozzle (14) is screwed into the bottom pipe opening of the vertical spray pipe (13).

2. The NMP recycling and refining equipment for lithium battery production according to claim 1, characterized in that: The inner supply ring box (3) has a vertical mounting plate (4) welded at three points on the outer box wall, and the plate body of the vertical mounting plate (4) and the inner tower wall of the distillation column body (1) are provided with mounting holes for screw bolts.

3. The NMP recycling and refining equipment for lithium battery production according to claim 1, characterized in that: The annular cavity of the inner supply ring box (3) is interconnected with the cavity of the cross connecting pipe (5), and the four sets of pipes of the cross connecting pipe (5) are cross-welded and interconnected at the ball cylinder (6).

4. The NMP recycling and refining equipment for lithium battery production according to claim 1, characterized in that: The L-shaped six-point pipe (11) has six sets of pipe bodies welded in a ring on the outside of the vertical cylinder wall of the connecting cylinder (10), and the six sets of pipe bodies of the bottom embedded pipe (12) are interconnected and welded below the inner supply ring box (3) above the L-shaped six-point pipe (11). The six sets of pipe bodies of the bottom embedded pipe (12) are inserted and welded to the vertical pipe body of the L-shaped six-point pipe (11).

5. The NMP recycling and refining equipment for lithium battery production according to claim 1, characterized in that: The L-shaped six-point pipe (11) has three sets of pipe bodies with vertical spray pipes (13) welded below each straight pipe body away from the connecting cylinder (10), and a spiral nozzle (14) is screwed into the threaded bottom pipe opening of the vertical spray pipe (13).

6. The NMP recycling and refining equipment for lithium battery production according to claim 1, characterized in that: A straight tube with a tapered expansion tube (9) is inserted into the opening of the connecting tube (10), and the tapered tube with the tapered expansion tube (9) tapered tubes tapering upwards is welded to each other at the bottom of the ball tube (6) through the throat tube (8).

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