Device for removing water in dichloromethane

Abstract

The utility model discloses a device for removing water in dichloromethane, and belongs to the technical field of lithium battery diaphragm production. The device comprises a surface water discharge unit and a dissolved water extraction unit, and the dissolved water extraction unit comprises a negative pressure pipeline communicated with the storage tank. According to the device, the surface water discharging unit and the negative pressure system for dissolved water are designed, the dissolved water is separated out through pressure reduction, meanwhile, the problems of the surface water and the dissolved water in the dichloromethane storage tank are solved, more thorough water removal is achieved, and the purity of dichloromethane is effectively improved. In the production process, the diaphragm can be cleaned more cleanly, product defects of the diaphragm caused by dissolved water in the prior art are avoided, and meanwhile, the problem that equipment pipelines and the like are corroded is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery diaphragm production, and more specifically relates to a device for removing water from dichloromethane. Background Art

[0002] In the lithium battery wet-process diaphragm industry, dichloromethane is often used to clean the diaphragm to remove the white oil on the diaphragm. Since dichloromethane is volatile and its vaporization temperature is 39.8°C under standard atmospheric pressure, dichloromethane is generally stored in an environment below 30°C. However, when the humidity is high in a low-temperature environment, a large amount of water vapor in the air will condense at low temperatures, and air condensation water will be generated in the storage tank storing dichloromethane. The water droplets continue to gather and finally fall into the dichloromethane, causing the dichloromethane to contain water. When the dichloromethane containing water is used to clean the diaphragm, the uneven volatilization of dichloromethane on the membrane surface will cause defects in the product.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a device for removing water from dichloromethane, which can solve the problem of surface water in dichloromethane and the problem of dissolved water in dichloromethane, overcome the product defects in the production process of lithium battery diaphragms, and also solve the problem of corrosion of equipment pipelines.

[0005] The utility model provides a device for removing water contained in dichloromethane, comprising a surface water discharge unit and a dissolved water extraction unit; the dissolved water extraction unit comprises a negative pressure pipeline connected with the storage tank.

[0006] Since the density of dichloromethane and water is different, the density of dichloromethane is 1.325Kg / L and the density of water is 1Kg / L. The density of water is less than that of dichloromethane, so water will float on the surface of dichloromethane to form surface water. At the same time, since the solubility of dichloromethane in water is 1.4% at 20°C and normal pressure, these dissolved water cannot be solved by stratification, resulting in dichloromethane still containing water during use. When the diaphragm is cleaned and dried, the water-containing problem causes uneven volatilization, and defects will still be formed on the membrane surface. Therefore, the utility model designs a structure specifically for both surface water and dissolved water to solve this problem.

[0007] Optionally, the surface water discharge unit includes a pumping end placed in the surface water above the dichloromethane in the storage tank and a pumping pump located outside the storage tank, and the pumping end and the pumping pump are connected via a pumping pipeline.

[0008] Preferably, the pumping end is connected to or bound with a density difference float to position the pumping end in the surface water.

[0009] Optionally, the water pumping pipeline is a hose; or,

[0010] Optionally, the portion of the water pumping pipeline between the water pumping end and the tank wall of the storage tank is a hose.

[0011] In another embodiment, the surface water discharge unit may include a drain port provided in the middle of the storage tank. The drain port is provided in the middle of the storage tank, and the liquid level of the storage tank is adjusted during the production process so that the liquid level surface reaches the position of the drain port, and then the liquid level is raised to allow the surface water to overflow along the drain port until all the water overflowing from the drain port is dichloromethane, and then it can be confirmed that the surface water has been emptied and there is no surface water in the storage tank.

[0012] Optionally, one end of the negative pressure pipeline is connected to the storage tank through a valve, and the other end is connected to a vacuum pump.

[0013] Optionally, the position where the negative pressure pipeline is connected to the storage tank is located above or on the top of the storage tank.

[0014] Optionally, a vent valve is provided above the storage tank.

[0015] Optionally, a liquid outlet valve is provided at the bottom of the storage tank.

[0016] According to the technical content disclosed in the utility model, the following beneficial effects are achieved:

[0017] The device for removing water from dichloromethane provided by the utility model is designed with a surface water discharge unit and a negative pressure system for dissolved water, so that the dissolved water can be precipitated by reducing the pressure, and the water can be removed more thoroughly, thereby effectively improving the purity of dichloromethane. When cleaning the diaphragm in the production process, the diaphragm can be cleaned more thoroughly, thus avoiding the problem of watermarks on the diaphragm caused by dissolved water.

[0018] At the same time, because there is water in dichloromethane, the hydrogen ions in the water and the chloride ions in the dichloromethane will combine to form hydrochloric acid. Hydrochloric acid is highly corrosive and will corrode pipes and equipment. After solving the water problem, the phenomenon of hydrochloric acid corrosion is also solved, protecting pipes and equipment from corrosion, extending the service life of equipment and pipes, and reducing production costs for enterprises.

[0019] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0021] Figure 1The utility model is a schematic diagram of the structure of the device for removing water from dichloromethane.

[0022] Explanation of the reference numerals: 1. Storage tank; 2. Surface water; 3. Dichloromethane; 4. Density difference float; 5. Hose; 6. Water pump; 7. Vacuum pump; 8. Negative pressure pipeline; 9. Vent valve; 10. Liquid outlet valve. DETAILED DESCRIPTION

[0023] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0024] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0025] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0026] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0027] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] See also Figure 1 The utility model discloses a device for removing water from dichloromethane, comprising a surface water discharge unit and a dissolved water extraction unit; the surface water discharge unit comprises a pumping end placed in the surface water 2 above the dichloromethane 3 in a storage tank 1 and a pumping pump 6 located outside the storage tank, the pumping end and the pumping pump 6 are connected by a pumping pipeline; the dissolved water extraction unit comprises a negative pressure pipeline 8 connected to the storage tank 1.

[0029] Figure 1 In the illustrated embodiment, the pumping end is bound with a density difference float 4 , and the density difference float 4 can position the pumping end in the surface water 2 .

[0030] Optionally, the entire water pumping pipeline or the portion between the water pumping end and the tank wall of the storage tank is a hose. Figure 1 In the illustrated embodiment, the portion between the water pumping end and the tank wall of the storage tank is a hose 5 .

[0031] Figure 1In the illustrated embodiment, one end of the negative pressure pipeline 8 is connected to the storage tank 1 through a valve, and the other end is connected to the vacuum pump 7 .

[0032] Figure 1 In the illustrated embodiment, the position where the negative pressure pipeline 8 is connected to the storage tank 1 is located at the top of the storage tank 1 .

[0033] Figure 1 In the illustrated embodiment, a vent valve 9 is provided above the storage tank 1 .

[0034] Figure 1 In the illustrated embodiment, a liquid outlet valve 10 is provided at the bottom of the storage tank 1 .

[0035] The working principle of the device for removing water from dichloromethane of the utility model includes:

[0036] Place the pumping end of the density difference float 4 bound with the selected density into the storage tank 1. Due to the different densities of dichloromethane and water, the buoyancy of the two liquids is different. The density difference float 4 floats in dichloromethane but sinks in water. The density difference float 4 floats on the surface of the dichloromethane 3 in the storage tank 1 with the pumping end. Start the pump 6 to pump out all the surface water 2 above the dichloromethane 3.

[0037] After the surface water 2 is extracted, the vent valve 9 and the liquid outlet valve 10 are closed, and the vacuum pump 7 is started to evacuate the storage tank 1 to -100Kpa through the negative pressure pipeline 8. After the pressure drops, the pressure of the dichloromethane liquid drops, and the dissolved water begins to precipitate and condense into water droplets floating above the surface of the dichloromethane 3. It is kept in a vacuum state for 1 hour. The water on the surface of the dichloromethane 3 will increase, and then the density difference float 4 and the pumping end are put in. According to the above-mentioned pumping principle, water is pumped again until all the precipitated dissolved water is extracted, or until the dichloromethane is extracted, the pumping pump 6 and the vacuum pump 7 are closed, and the vent valve 9 is opened. After the storage tank 1 returns to normal pressure, the entire water removal work is completed, and the liquid outlet valve 10 is opened, and the storage tank 1 returns to normal use.

[0038] In other embodiments, the above-mentioned Figure 1 The surface water discharge unit of the embodiment shown is provided with a drain port in the middle of the storage tank. During the production process, the liquid level of the storage tank is adjusted to make the liquid level surface reach the position of the drain port, and then the liquid level is raised to allow the surface water to overflow from the drain port until all the water overflowing from the drain port is dichloromethane. It can be confirmed that the surface water has been emptied and there is no surface water in the storage tank.

[0039] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A device for removing water from dichloromethane, characterized in that: It includes a surface water discharge unit and a dissolved water extraction unit; the dissolved water extraction unit includes a negative pressure pipeline connected to the storage tank; The surface water discharge unit comprises a pumping end placed in the surface water above the dichloromethane in the storage tank and a pumping pump located outside the storage tank, wherein the pumping end and the pumping pump are connected via a pumping pipeline; The pumping end is connected to or bound with a density difference float to position the pumping end in the surface water; One end of the negative pressure pipeline is connected to the storage tank through a valve, and the other end is connected to a vacuum pump.

2. The device for removing water from dichloromethane according to claim 1, characterized in that: The water pumping pipeline is a hose.

3. The device for removing water from dichloromethane according to claim 1, characterized in that: The portion of the water pumping pipeline between the water pumping end and the tank wall of the storage tank is a hose.

4. The device for removing water from dichloromethane according to claim 1, characterized in that: The surface water discharge unit includes a water discharge port provided in the middle of the storage tank.

5. The device for removing water from dichloromethane according to claim 1, characterized in that: The position where the negative pressure pipeline is connected to the storage tank is located above or on the top of the storage tank.

6. The device for removing water from dichloromethane according to claim 1, characterized in that: A vent valve is provided above the storage tank.

7. The device for removing water from dichloromethane according to claim 1, characterized in that: A liquid outlet valve is provided at the bottom of the storage tank.

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