NMP (N-Methyl Pyrrolidone) solvent recovery device

Abstract

The utility model discloses an NMP (N-Methyl Pyrrolidone) solvent recovery device which comprises a distillation retort, a filter box and a cooling box, communication pipes are respectively connected between the distillation retort and the filter box and between the distillation retort and the cooling box, and the NMP solvent recovery device is characterized in that a feed hopper is fixedly arranged at the upper end of the filter box, a mounting groove is formed in the filter box, a filter plate is movably arranged in the mounting groove, and the filter plate is fixedly connected with the filter box. One end of the filter plate penetrates through the filter box and is fixedly connected with a mounting plate, a fixing shell is fixedly arranged on one side of the cooling box, a two-way screw is rotationally arranged in the fixing shell, two L-shaped fixing blocks are arranged on the two-way screw, and fixing grooves matched with the fixing blocks are formed in the two sides of the mounting plate. According to the NMP waste liquid recovery device, impurities in NMP waste liquid can be filtered and intercepted, so that the purity of a recovered NMP solvent is improved, meanwhile, the filter plate is convenient to disassemble, and the working efficiency of maintenance and replacement of the filter plate can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of NMP solvent recovery, and more specifically, to an NMP solvent recovery device. Background Art

[0002] NMP (N-methylpyrrolidone) is an organic compound with the chemical formula C5H9NO. It is a polar solvent widely used in lithium battery production. NMP solvent is usually recovered through an NMP solvent recovery device. In the green battery production process, the recovery and treatment of NMP solvent is an important link affecting environmental protection. During the use of the existing NMP solvent recovery device, since the NMP waste liquid contains some impurities, if these impurities are not removed during the recovery process, it will affect the purity of the recovered NMP solvent, thereby reducing the quality of the recovered NMP solvent; secondly, during the use of the existing NMP solvent recovery device, after the NMP solvent is heated and distilled, the dissolved solute forms a solid that adheres to the inner wall of the heating kettle. If it is not cleaned in time, it will affect the subsequent use of the entire device. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the problems existing in the prior art, the utility model provides an NMP solvent recovery device to solve the technical problem that during the use of the existing NMP solvent recovery device mentioned in the background technology, since NMP waste liquid contains some impurities, if these impurities are not removed during the recovery process, the purity of the recovered NMP solvent will be affected.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an NMP solvent recovery device, comprising a distillation tank, a filter box and a cooling box, wherein the distillation tank is respectively connected to the filter box and the cooling box with communicating pipes, wherein the device is characterized in that: a feed hopper is fixedly provided at the upper end of the filter box, a mounting groove is provided in the filter box, a filter plate is movably provided in the mounting groove, one end of the filter plate passes through the filter box and is fixedly connected to the mounting plate, a fixed shell is fixedly provided at one side of the cooling box, a bidirectional screw is rotatably provided in the fixed shell, two L-shaped fixing blocks are provided on the bidirectional screw, fixing grooves matching the fixing blocks are provided on both sides of the fixing plate, and one end of the bidirectional screw passes through the fixing shell and is fixedly connected to a turning handle;

[0007] A water spray pipe is fixedly arranged in the distillation tank, the water spray pipe is fixedly connected with a water inlet pipe, and the water inlet pipe passes through the distillation tank and is fixedly connected with a fixing ring.

[0008] The utility model is further configured that a cooling pipe is arranged in the cooling box, and the upper end of the cooling pipe passes through the cooling box and is fixedly connected with a communicating pipe, so as to facilitate cooling of the cooling pipe.

[0009] The utility model is further configured that one side of the fixing ring is movably connected to a limiting ring, and the limiting ring is fixedly connected to an external pipe, so as to facilitate the connection of the external pipe.

[0010] The utility model is further configured that two limiting rods are fixedly provided on the limiting ring, and two limiting holes matched with the limiting rods are provided on the fixing ring, so as to facilitate the limiting of the limiting ring.

[0011] The utility model is further configured that a rotating ring is rotatably connected to the outer side of the fixed ring, and the rotating ring is threadedly connected to the limiting ring to facilitate fixing the external pipe.

[0012] The utility model is further configured that a heating chamber is provided in the distillation tank, and an electric heating wire is provided in the heating chamber to facilitate heating the distillation tank.

[0013] The utility model is further configured as follows: a driving chamber is provided in the distillation tank, two meshing gears are rotatably provided in the driving chamber, a motor is fixedly provided at the upper end of the distillation tank, the driving end of the motor extends into the driving chamber and is fixedly connected to the gears to facilitate the rotation of the gears.

[0014] The utility model is further configured that a rotating rod is fixedly provided at the lower end of each gear, and a plurality of stirring rods are fixedly connected to the lower end of each rotating rod through a driving chamber to facilitate the rotation of the stirring rods.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a NMP solvent recovery device having the following

[0017] Beneficial effects:

[0018] 1. The impurities in the NMP waste liquid can be filtered and intercepted by cooperating with the distillation tank, the filter box, the cooling box, the communicating pipe, the feed hopper, the mounting groove, the filter plate, the mounting plate, the fixing shell, the bidirectional screw, the fixing block, the fixing groove and the turning handle, so as to improve the purity of the recovered NMP solvent. At the same time, the filter plate is easy to disassemble, which can improve the work efficiency of the filter plate maintenance and replacement.

[0019] 2. Through the coordination of the water spray pipe, the water inlet pipe, the first fixing ring, the second fixing ring, the external pipe, the limit rod, the limit hole and the rotating ring, the used distillation tank can be sprayed with water for cleaning, thereby reducing the impact on subsequent use. At the same time, the water inlet pipe can be quickly connected to the external pipe, thereby improving the work efficiency during installation.

[0020] 3. Through the coordination of the heating chamber, the electric heating wire, the driving chamber, the gear, the motor, the rotating rod and the stirring rod, the NMP waste liquid can be quickly stirred during the heating process. The stirring rods on the two rotating rods can rotate in opposite directions, and the NMP waste liquid can be quickly stirred, thereby improving the uniformity of the heating of the NMP waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an NMP solvent recovery device in use;

[0022] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0023] Figure 3 It is a schematic diagram of the partial cross-sectional structure of the filter box and its connecting parts when the filter plate is installed;

[0024] Figure 4 It is a schematic diagram of the partial cross-sectional structure of the distillation tank and its connecting parts when the stirring rod is rotating;

[0025] Figure 5 It is a schematic diagram of the partial cross-section structure when the water inlet pipe is connected to the external pipe.

[0026] In the figure: 1. distillation tank; 2. filter box; 3. cooling box; 4. communicating pipe; 5. feed hopper; 6. mounting groove; 7. filter plate; 8. mounting plate; 9. fixing shell; 10. bidirectional screw; 11. fixing block; 12. fixing groove; 13. turning handle; 14. water spray pipe; 15. water inlet pipe; 16. fixing ring; 17. cooling pipe; 18. limiting ring; 19. external pipe; 20. limiting rod; 21. limiting hole; 22. rotating ring; 23. heating chamber; 24. electric heating wire; 25. driving chamber; 26. gear; 27. motor; 28. rotating rod; 29. ​​stirring rod. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, directions such as "up" and "down" are usually used in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually used in reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0030] See also Figure 1-5 , an NMP solvent recovery device, comprising a distillation tank 1, a filter box 2 and a cooling box 3, wherein the distillation tank 1 is respectively connected to the filter box 2 and the cooling box 3 with a communicating pipe 4, wherein: a feed hopper 5 is fixedly arranged at the upper end of the filter box 2, a mounting groove 6 is arranged in the filter box 2, a filter plate 7 is movably arranged in the mounting groove 6, one end of the filter plate 7 passes through the filter box 2 and is fixedly connected to a mounting plate 8, a fixed shell 9 is fixedly arranged at one side of the cooling box 3, a bidirectional screw 10 is rotatably arranged in the fixed shell 9, two L-shaped fixing blocks 11 are arranged on the bidirectional screw 10, fixing grooves 12 matching the fixing blocks 11 are arranged on both sides of the mounting plate 8, and one end of the bidirectional screw 10 passes through the fixing shell 9 and is fixedly connected to a turning handle 13;

[0031] A water spray pipe 14 is fixedly provided in the distillation tank 1 , and the water spray pipe 14 is fixedly connected to a water inlet pipe 15 , and the water inlet pipe 15 passes through the distillation tank 1 and is fixedly connected to a fixing ring 16 .

[0032] In this embodiment, the feed hopper 5 is hingedly connected with a cover body, the cover body is opened, the NMP waste liquid is placed from the feed hopper 5 into the filter box 2, and then the impurities in the NMP waste liquid are intercepted by the filter plate 7, and the filtered NMP waste liquid enters the distillation tank 1 through the communicating pipe 4. When the filter plate 7 needs to be replaced, the handle 13 is turned, and the handle 13 drives the bidirectional screw 10 to rotate. The bidirectional screw 10 is provided with two threaded areas in opposite directions, so that the two fixed blocks 11 move in the direction of separation, and the upper end of the fixed shell 9 is provided with two moving grooves that match the fixed blocks 11, so that the fixed blocks 11 are moved out of the fixed grooves 12, thereby separating from the mounting plate 8, and the mounting plate 8 is pulled, so that the mounting plate 8 drives the filter plate 7 to move out of the mounting groove 6, so that the filter plate 7 is removed, and the replaced filter plate 7 and the mounting plate 8 can be installed in the filter box 2 using the opposite method.

[0033] More specifically, the two fixing blocks 11 can be turned to release the fixing of the mounting plate 8 by rotating the handle 13, so that the filter plate 7 can be removed and replaced. When the distillation tank 1 needs to be sprayed with water for cleaning, the external clean water enters the water spray pipe 14 from the water inlet pipe 15, and the water spray pipe 14 is provided with a plurality of nozzles, so as to spray the distillation tank 1 for cleaning.

[0034] See also Figure 1-5 As an implementation method for cooling the vaporized NMP solvent: a cooling pipe 17 is provided in the cooling box 3, and the upper end of the cooling pipe 17 passes through the cooling box 3 and is fixedly connected to the communicating pipe 4.

[0035] Specifically, after the NMP solvent in the distillation tank 1 is vaporized, it enters the cooling pipe 17 through the connecting pipe 4. Two circulation pipes are provided on one side of the cooling box 3. The two circulation pipes are connected to the external circulating coolant, so that the circulating coolant filled in the cooling box 3 cools the cooling pipe 17, and the formed NMP solvent flows out along the cooling pipe 17.

[0036] See also Figure 1-5 As an implementation method for connecting the water inlet pipe 15 with the external pipe 19: a limiting ring 18 is movably connected to one side of the fixing ring 16, and the limiting ring 18 is fixedly connected to the external pipe 19. Two limiting rods 20 are fixedly provided on the limiting ring 18, and two limiting holes 21 matching the limiting rods 20 are provided on the fixing ring 16. A rotating ring 22 is rotatably connected to the outer side of the fixing ring 16, and the rotating ring 22 is threadedly connected to the limiting ring 18.

[0037] Specifically, the external tube 19 is moved so that the external tube 19 drives the limit ring 18 and the two limit rods 20 to move, the two limit rods 20 are inserted into the two limit holes 21, and the rotating ring 22 is sleeved on the outside of the external tube 19, and the rotating ring 22 is rotated so that the rotating ring 22 is threadedly connected with the limit ring 18. During the rotation of the rotating ring 22, the external tube 19 drives the limit ring 18 to move toward the water inlet pipe 15, thereby fixing the external tube 19 to one end of the water inlet pipe 15. In order to increase the sealing effect, a sealing ring can be set between the water inlet pipe 15 and the external tube 19.

[0038] See also Figure 1-5 As an implementation method for heating and distilling NMP waste liquid: a heating chamber 23 is provided in the distillation tank 1, an electric heating wire 24 is provided in the heating chamber 23, a driving chamber 25 is provided in the distillation tank 1, two meshing gears 26 are rotatably provided in the driving chamber 25, a motor 27 is fixedly provided at the upper end of the distillation tank 1, the driving end of the motor 27 extends into the driving chamber 25 and is fixedly connected to the gear 26, a rotating rod 28 is fixedly provided at the lower end of each gear 26, and a plurality of stirring rods 29 are fixedly connected to the lower end of each rotating rod 28 through the driving chamber 25.

[0039] Specifically, the NMP waste liquid filtered by the filter plate 7 enters the distillation tank 1 through the communicating pipe 4, and the electric heating wire 24 is started to heat the NMP waste liquid in the distillation tank 1. At the same time, the motor 27 is started, and the motor 27 drives one of the gears 26 to rotate. Since the two gears 26 are meshed and connected, the two gears 26 rotate in opposite directions, and the gear 26 drives the rotating rod 28 to rotate, and the rotating rod 28 drives the stirring rod 29 to rotate, so that the stirring rods 29 on the two rotating rods 28 rotate in opposite directions, thereby quickly stirring the NMP waste liquid in the distillation tank 1 so that it can be evenly heated.

[0040] To sum up, when the overall equipment is in use:

[0041] When it is necessary to filter the impurities in the NMP waste liquid, the feed hopper 5 is hinged with a cover body, the cover body is opened, the NMP waste liquid is placed from the feed hopper 5 into the filter box 2, and then the impurities in the NMP waste liquid are intercepted by the filter plate 7, and the filtered NMP waste liquid enters the distillation tank 1 through the communicating pipe 4. When it is necessary to replace the filter plate 7, the handle 13 is turned, and the handle 13 drives the bidirectional screw 10 to rotate. The bidirectional screw 10 is provided with two threaded areas in opposite directions, so that the two fixed blocks 11 move in the direction of separation, and the upper end of the fixed shell 9 is provided with two moving grooves that match the fixed blocks 11, so that the fixed blocks 11 are moved out of the fixed groove 12, thereby separating from the mounting plate 8, and the mounting plate 8 is pulled, so that the mounting plate 8 drives the filter plate 7 to move out of the mounting groove 6, so that the filter plate 7 is removed, and the replaced filter plate 7 and the mounting plate 8 can be installed in the filter box 2 using the opposite method.

[0042] When the NMP waste liquid needs to be heated, the NMP waste liquid filtered by the filter plate 7 enters the still tank 1 through the interlinked pipe 4, the electric heating wire 24 is started, so that the NMP waste liquid in the still tank 1 is heated, and the motor 27 is started at the same time, and the motor 27 drives one of the gears 26 to rotate, and because the two gears 26 are meshed and connected, the two gears 26 are rotated in opposite directions, and the gear 26 drives the rotating rod 28 to rotate, and the rotating rod 28 drives the stirring rod 29 to rotate, so that the stirring rods 29 on the two rotating rods 28 rotate in opposite directions, so that the NMP waste liquid in the still tank 1 is quickly stirred, so that it can be evenly heated. After the NMP solvent in the still tank 1 is vaporized, it enters the cooling pipe 17 through the interlinked pipe 4, and two circulation pipes are provided on one side of the cooling box 3, and the two circulation pipes are connected to the cooling liquid of the external circulation, so that the circulating cooling liquid filled in the cooling box 3 cools the cooling pipe 17, and the formed NMP solvent can flow out along the cooling pipe 17.

[0043] When the distillation tank 1 needs to be sprayed with water for cleaning, the external pipe 19 is moved so that the external pipe 19 drives the limiting ring 18 and the two limiting rods 20 to move, the two limiting rods 20 are inserted into the two limiting holes 21, and the rotating ring 22 is sleeved on the outside of the external pipe 19, and the rotating ring 22 is rotated so that the rotating ring 22 is threadedly connected with the limiting ring 18. During the rotation of the rotating ring 22, the external pipe 19 drives the limiting ring 18 to move toward the water inlet pipe 15, thereby fixing the external pipe 19 to one end of the water inlet pipe 15. In order to increase the sealing effect, a sealing ring can be provided between the water inlet pipe 15 and the external pipe 19. The external clean water enters the water spray pipe 14 through the water inlet pipe 15 from the external pipe 19, and the water spray pipe 14 is provided with a plurality of nozzles, so as to spray water and clean the inside of the distillation tank 1. The whole device is controlled by the controller. Since the equipment matched with the controller is a common equipment and belongs to the existing mature technology, its electrical connection relationship and specific circuit structure are not described here.

[0044] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which are not described here one by one. In the above, all fixed connections are preferably welded. Although the embodiments of the utility model have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A NMP solvent recovery device, comprising a distillation tank (1), a filter box (2) and a cooling box (3), wherein the distillation tank (1) is connected to the filter box (2) and the cooling box (3) respectively with a communicating pipe (4), wherein: A feed hopper (5) is fixedly provided at the upper end of the filter box (2), a mounting groove (6) is provided in the filter box (2), a filter plate (7) is movably provided in the mounting groove (6), one end of the filter plate (7) passes through the filter box (2) and is fixedly connected to a mounting plate (8), a fixed shell (9) is fixedly provided on one side of the cooling box (3), a bidirectional screw (10) is rotatably provided in the fixed shell (9), two L-shaped fixing blocks (11) are provided on the bidirectional screw (10), fixing grooves (12) matching with the fixing blocks (11) are provided on both sides of the mounting plate (8), one end of the bidirectional screw (10) passes through the fixing shell (9) and is fixedly connected to a turning handle (13); A water spray pipe (14) is fixedly provided in the distillation tank (1), the water spray pipe (14) is fixedly connected to a water inlet pipe (15), and the water inlet pipe (15) passes through the distillation tank (1) and is fixedly connected to a fixing ring (16).

2. A NMP solvent recovery device according to claim 1, characterized in that: A cooling pipe (17) is provided in the cooling box (3), and the upper end of the cooling pipe (17) passes through the cooling box (3) and is fixedly connected to the communicating pipe (4).

3. A NMP solvent recovery device according to claim 2, characterized in that: One side of the fixing ring (16) is movably connected to a limiting ring (18), and one side of the limiting ring (18) is fixedly connected to an external pipe (19).

4. A NMP solvent recovery device according to claim 3, characterized in that: The limiting ring (18) is fixedly provided with two limiting rods (20), and the fixing ring (16) is provided with two limiting holes (21) matched with the limiting rods (20).

5. A NMP solvent recovery device according to claim 4, characterized in that: The outer side of the fixed ring (16) is rotatably connected to a rotating ring (22), and the rotating ring (22) is threadedly connected to the limiting ring (18).

6. A NMP solvent recovery device according to any one of claims 1 or 2, characterized in that: A heating chamber (23) is provided in the distillation tank (1), and an electric heating wire (24) is provided in the heating chamber (23).

7. A NMP solvent recovery device according to claim 6, characterized in that: The distillation tank (1) is provided with a driving chamber (25), and two meshing gears (26) are rotatably provided in the driving chamber (25). A motor (27) is fixedly provided at the upper end of the distillation tank (1), and the driving end of the motor (27) extends into the driving chamber (25) and is fixedly connected to the gears (26).

8. A NMP solvent recovery device according to claim 7, characterized in that: A rotating rod (28) is fixedly provided at the lower end of each gear (26), and a plurality of stirring rods (29) are fixedly connected to the lower end of each rotating rod (28) through the driving chamber (25).

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