Stepped reverse overflow white oil extraction device for diaphragm production

Abstract

The utility model discloses a stepped reverse overflow white oil extraction device for diaphragm production. The stepped reverse overflow white oil extraction device comprises a plurality of extraction boxes, the plurality of extraction boxes are sequentially arranged in the diaphragm conveying direction and are sequentially communicated; each extraction box is filled with an extraction liquid; the diaphragm sequentially passes through the plurality of extraction boxes and passes through the extraction liquid in the extraction boxes; and the overflow direction of the extraction liquid in the extraction boxes is opposite to the conveying direction of the diaphragm. The conveying direction of the diaphragm is opposite to the overflow direction of the extraction liquid, so that the oil concentration in the extraction tank can be reduced, the utilization rate of the extraction liquid can be improved, the extraction efficiency and the extraction effect can be improved, and the whole device is simple in structure, convenient to operate and high in extraction efficiency and utilization rate of the extraction liquid; and the problem of secondary pollution in the production process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, and more specifically to a stepped reverse overflow white oil extraction device for diaphragm production. Background Art

[0002] Lithium battery separator is a thin film used in lithium batteries, which can prevent the electrolyte from flowing out of the battery and protect the components inside the battery from damage. A large amount of white oil is required in the production process of ultra-high molecular weight polyethylene separator, and after the production is completed, the white oil needs to be extracted with a solvent. Most existing processes use tetrachloroethylene or dichloromethane as an extractant. Tetrachloroethylene or dichloromethane has a strong odor, a low flash point, is easy to deflagrate, and has a relatively large loss in the air. After the extraction of tetrachloroethylene or dichloromethane, the extractant needs to be heated and separated from the white oil, which will lose a lot of energy. At the same time, a large amount of solvent needs to be condensed and recovered, which also consumes a lot of energy. This has spawned a new type of environmentally friendly extractant, which is composed of ionic liquids, has the characteristics of low carbon, environmental protection, non-toxicity, and a higher flash point. It is more suitable for industrial production and effectively solves energy and environmental protection problems.

[0003] At present, there is no professional technology and equipment for extracting diaphragm white oil with ionic liquid, and it is still in the exploratory stage. The original process only allows the diaphragm to be immersed in a single extraction tank. However, after the diaphragm is extracted by the extraction tank, the white oil is extracted in the extraction liquid tank. As the diaphragm continues to enter, the concentration of white oil in the extraction tank continues to increase, which will cause secondary pollution to the diaphragm and cannot achieve a satisfactory extraction effect. There are problems such as low extraction efficiency, poor extraction effect, low utilization rate of extraction liquid, and secondary pollution.

[0004] Therefore, how to provide a stepped reverse overflow white oil extraction device for diaphragm production that can improve extraction efficiency and extraction liquid utilization is one of the technical problems that urgently need to be solved in the field. Utility Model Content

[0005] In view of this, the utility model provides a stepped reverse overflow white oil extraction device for diaphragm production, the purpose of which is to solve the problems existing in the prior art.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A stepped reverse overflow white oil extraction device for diaphragm production comprises: a plurality of extraction boxes; the plurality of extraction boxes are sequentially arranged and sequentially connected along the diaphragm conveying direction; each of the extraction boxes is filled with extraction liquid; the diaphragm passes through the plurality of extraction boxes sequentially and passes through the extraction liquid in the extraction boxes; the overflow direction of the extraction liquid in the plurality of extraction boxes is opposite to the diaphragm conveying direction.

[0008] Preferably, each of the extraction boxes is provided with a plurality of extraction tanks; each of the extraction tanks is filled with extraction liquid; the plurality of extraction tanks are arranged in sequence along the diaphragm transmission direction; an overflow port for the extraction liquid to flow out is opened on the upper part of one side of each of the extraction tanks; the heights of the plurality of overflow ports decrease in sequence along the diaphragm transmission direction; the overflow direction of the extraction liquid in the plurality of extraction tanks is opposite to the diaphragm transmission direction; the diaphragm passes through the extraction liquid in each of the extraction tanks in sequence.

[0009] Preferably, the two closest extraction tanks in two adjacent extraction boxes are connected via a first overflow pipe.

[0010] Preferably, a second overflow pipe corresponding to the overflow port is provided on one side of each extraction tank; the overflow port of the previous extraction tank is connected to the next extraction tank through the second overflow pipe.

[0011] Preferably, the second overflow pipe is a square tube; the width of the inner cavity of the second overflow pipe is the same as the width of the inner cavity of the extraction tank.

[0012] Preferably, the plurality of extraction boxes are arranged in sequence from low to high along the membrane conveying direction.

[0013] Preferably, the plurality of extraction tanks in each extraction box are arranged in sequence from low to high along the membrane conveying direction.

[0014] Compared with the prior art, the utility model has achieved the following technical effects: the utility model can reduce the oil concentration in the extraction tank by setting the diaphragm transmission direction opposite to the overflow direction of the extraction liquid, which can not only improve the utilization rate of the extraction liquid, but also improve the extraction efficiency and extraction effect. The whole device has a simple structure, convenient operation, high extraction efficiency and extraction liquid utilization, and avoids the problem of secondary pollution in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a stepped reverse overflow white oil extraction device for diaphragm production according to the utility model;

[0016] Figure 2 It is the structural schematic diagram of the extraction box;

[0017] In the figure: 1. extraction box; 2. extraction liquid; 3. diaphragm; 4. extraction tank; 5. first overflow pipe; 6. second overflow pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example

[0020] Reference Figure 1-2 As shown, the utility model discloses a stepped reverse overflow white oil extraction device for diaphragm production, comprising: a plurality of extraction boxes 1; the plurality of extraction boxes 1 are arranged in sequence along the conveying direction of the diaphragm 3 and are connected in sequence through a first overflow pipe 5; the heights of the plurality of extraction boxes 1 increase in sequence from front to back, so that the extract 2 in the rearmost extraction box 1 overflows into the frontmost extraction box 1 in sequence; each extraction box 1 is filled with an extract 2; the diaphragm 3 passes through the plurality of extraction boxes 1 in sequence and through the extract 2 in each extraction box 1, so as to extract the white oil on the diaphragm 3; the overflow direction of the extract 2 in the plurality of extraction boxes 1 is opposite to the conveying direction of the diaphragm 3; when in use, the diaphragm 3 enters from the front side of the frontmost extraction box 1 and is output from the rear side of the rearmost extraction box 1, so that the concentration of the extract 2 in the plurality of extraction boxes 1 decreases in sequence from front to back. Reduce, at the same time, new extraction liquid 2 enters from the extraction box 1 at the rear side and overflows to the extraction box 1 at the front side in a step-by-step manner, and is finally discharged from the extraction box 1 at the front side into the recovery system. In this process, the transmission direction of the diaphragm 3 is opposite to the overflow direction of the extraction liquid 2, so that the low-concentration (white oil content) extraction liquid in the rear extraction box 1 continuously overflows into the front extraction box 1, thereby reducing the extraction liquid concentration in the front extraction box 1, which can not only improve the utilization rate of the extraction liquid, but also improve the extraction efficiency and extraction effect. At the same time, the overflow method is adopted to make the extraction liquid automatically circulate in multiple extraction boxes, which can save the overflow pump required for each extraction tank in the traditional process, making the device structure simpler and the operation more convenient, and by controlling the concentration of the extraction liquid in the rear extraction box 1, the problem of secondary pollution can be well avoided.

[0021] In this embodiment, each extraction box 1 is provided with a plurality of extraction tanks 4; each extraction tank 4 is filled with an extract 2; the plurality of extraction tanks 4 are arranged in sequence along the transmission direction of the diaphragm 3; the heights of the plurality of extraction tanks 4 are increased from front to back; an overflow port for the extract 2 to flow out is opened at the upper front side of each extraction tank 4; the heights of the plurality of overflow ports are decreased in sequence along the transmission direction of the diaphragm 3; the overflow direction of the extract 2 in the plurality of extraction tanks 4 is opposite to the transmission direction of the diaphragm 3; the diaphragm 3 passes through the extract 2 in each extraction tank 4 in sequence; when in use, the diaphragm 3 enters from the front side of the frontmost extraction tank 4 and flows out from the rearmost extraction tank 4 The output is taken from the rear side of the tank 4, so that the concentration of the extract 2 in the multiple extraction tanks 4 decreases from the front to the back. At the same time, the extract 2 enters from the extraction tank 4 on the rear side and overflows to the extraction tank 4 on the front side in a step-by-step manner. Finally, it is discharged from the extraction tank 4 on the front side into the extraction tank 4 in the next extraction box 1 or into the recovery system. In this process, the transmission direction of the diaphragm 3 is opposite to the overflow direction of the extract 2, so that the low-concentration extract in the rear extraction tank 4 continuously overflows into the front extraction tank 4, thereby reducing the concentration of the extract in the front extraction tank 4, and further improving the extraction efficiency and the utilization rate of the extract.

[0022] In this embodiment, each extraction tank 4 has the same structure, and only has a height difference in the vertical direction.

[0023] In this embodiment, the height of the rearmost extraction tank 4 in the front extraction box 1 of the two adjacent extraction boxes 1 in the vertical direction is lower than the frontmost extraction tank 4 in the rear extraction box 1 .

[0024] In this embodiment, the rearmost extraction tank 4 in the front extraction box 1 of the two adjacent extraction boxes 1 is connected to the frontmost extraction tank 4 in the rear extraction box 1 through the first overflow pipe 5 .

[0025] In this embodiment, a second overflow pipe 6 connected to the overflow port is provided on the front side of each extraction tank 4; the overflow port of each extraction tank 4 except the frontmost extraction tank 4 in the same extraction box 1 is connected to the adjacent extraction tank 4 on the front side through the second overflow pipe 6.

[0026] In this embodiment, the second overflow pipe 6 is a square tube; the width of the inner cavity of the second overflow pipe 6 is the same as the width of the inner cavity of the extraction tank 4, so that the extraction liquid can overflow in a waterfall-like manner, that is, the entire liquid level can overflow.

[0027] In this embodiment, the rear end of each first overflow pipe 5 is communicated with the bottom of the corresponding second overflow pipe 6 , and the front end thereof is communicated with the corresponding extraction tank 4 .

[0028] In this embodiment, the front side of the second overflow pipe 6 on the frontmost extraction tank 4 in each extraction box 1 is closed, so that the internal extraction liquid can flow into the first overflow pipe 5 through the second overflow pipe 6 to avoid leakage of the extraction liquid.

[0029] In this embodiment, the first overflow pipe 5 in the frontmost extraction box 1 is connected to the recovery system to facilitate the recovery of the extraction liquid.

[0030] In this embodiment, the number of extraction boxes 1 is three; the number of extraction tanks 4 in each extraction box 1 is three.

[0031] In some other embodiments, the number of extraction boxes 1 and extraction tanks 4 can be designed according to actual conditions.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A stepped reverse overflow white oil extraction device for diaphragm production, characterized in that: include: A plurality of extraction boxes (1); the plurality of extraction boxes (1) are arranged in sequence along the transmission direction of the diaphragm (3) and are connected in sequence; each of the extraction boxes (1) is filled with an extraction liquid (2); the diaphragm (3) passes through the plurality of extraction boxes (1) in sequence and passes through the extraction liquid (2) in the extraction box (1); the overflow direction of the extraction liquid (2) in the plurality of extraction boxes (1) is opposite to the transmission direction of the diaphragm (3); Each of the extraction boxes (1) is provided with a plurality of extraction tanks (4); each of the extraction tanks (4) is filled with an extracting liquid (2); the plurality of extraction tanks (4) are arranged in sequence along the transmission direction of the diaphragm (3); an overflow port for the extracting liquid (2) to flow out is opened at the upper part of one side of each of the extraction tanks (4); the heights of the plurality of overflow ports decrease in sequence along the transmission direction of the diaphragm (3); the overflow direction of the extracting liquid (2) in the plurality of extraction tanks (4) is opposite to the transmission direction of the diaphragm (3); the diaphragm (3) passes through the extracting liquid (2) in each of the extraction tanks (4) in sequence.

2. The step-type reverse overflow white oil extraction device for diaphragm production according to claim 1, characterized in that: The two closest extraction tanks (4) in two adjacent extraction boxes (1) are connected via a first overflow pipe (5).

3. The step-type reverse overflow white oil extraction device for diaphragm production according to claim 2, characterized in that: A second overflow pipe (6) corresponding to the overflow port is provided on one side of each extraction tank (4); the overflow port of the previous extraction tank (4) is connected to the next extraction tank (4) through the second overflow pipe (6).

4. The step-type reverse overflow white oil extraction device for diaphragm production according to claim 3, characterized in that: The second overflow pipe (6) is a square pipe; the width of the inner cavity of the second overflow pipe (6) is the same as the width of the inner cavity of the extraction tank (4).

5. The step-type reverse overflow white oil extraction device for diaphragm production according to claim 4, characterized in that: The plurality of extraction boxes (1) are arranged in sequence from low to high along the transmission direction of the diaphragm (3).

6. The step-type reverse overflow white oil extraction device for diaphragm production according to claim 5, characterized in that: The plurality of extraction tanks (4) in each extraction box (1) are arranged in sequence from low to high along the transmission direction of the diaphragm (3).

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