Adsorption system for decoloring white oil

Abstract

The utility model discloses an adsorption system for decoloring white oil, which comprises a fine distillation reaction kettle, an adsorption tower and a vacuum buffer tank, and the fine distillation reaction kettle and the vacuum buffer tank are respectively provided with a vacuum system A and a vacuum system B which are matched with the fine distillation reaction kettle and the vacuum buffer tank. The white oil purification device is simple in structure, the purpose of white oil purification is achieved by arranging the adsorption bed layer on the sand containing tray, then the oil outlet screen column higher than the adsorption bed layer is arranged on the sand containing tray, under the action of pressure, the flow direction of white oil passing through the sand layer is changed into the flow direction of white oil entering from the side face, the flattening operation can be omitted, and after the adsorption bed layer achieves adsorption saturation, the white oil can be purified. At the moment, only a quick-mounting screw for connecting the upper part and the lower part of the adsorption tower needs to be unscrewed, a stretching cylinder is started to separate the upper part and the lower part, and the stretching cylinder is started to combine the upper part and the lower part after the adsorption material reaching adsorption saturation is poured out; and the system is restarted to treat the white oil to be treated, so that the effect of quickly replacing the adsorption bed layer is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery diaphragm production, in particular to an adsorption system for decolorizing white oil. Background Art

[0002] In lithium-ion battery manufacturing, the separator, a key component within the battery, must possess not only excellent electrochemical stability but also exceptional mechanical strength and appropriate porosity to ensure effective electrolyte penetration and free ion movement. To meet these requirements, materials such as polyethylene (PE) are often used as substrates during production, and specific pore-forming agents are added to manipulate the separator's microstructure. White oil, due to its excellent thermal stability and chemical inertness, is a widely used pore-forming agent.

[0003] However, in the production process of diaphragms, white oil and PE materials undergo a series of complex processes such as melting, shaping, and stretching. Especially under high temperature conditions (100°C to 250°C), white oil is prone to oxidation reactions, producing a series of byproducts such as free carbon and colloidal substances. These byproducts not only cause the white oil to darken in color and reduce its cleanliness, but may also adversely affect the performance of the diaphragm, such as reducing the uniformity of porosity and affecting the mechanical strength and electrochemical performance of the diaphragm. In addition, as white oil is recycled in the production process, its quality gradually deteriorates, further exacerbating the above problems. To this end, an adsorption system for white oil decolorization has been proposed. Utility Model Content

[0004] The purpose of the utility model is to provide an adsorption system for decolorizing white oil to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an adsorption system for decolorizing white oil, comprising a refined distillation reactor, an adsorption tower, and a vacuum buffer tank, wherein the refined distillation reactor and the vacuum buffer tank are respectively provided with a vacuum system A and a vacuum system B matched therewith, a first white oil delivery pump for controlling the flow rate of the white oil is provided between the refined distillation reactor and the adsorption tower, and the adsorption tower comprises an adsorption tower shell and a compressed air inlet provided on the adsorption tower shell;

[0006] The adsorption tower shell includes an upper half structure of the adsorption tower and a lower half structure of the adsorption tower. The upper half structure of the adsorption tower and the lower half structure of the adsorption tower are connected by a stretching cylinder. A sand tray is installed on the end face of the lower half structure of the adsorption tower adjacent to the upper half structure of the adsorption tower. An oil outlet screen column is installed on the sand tray. An adsorption bed layer composed of a plurality of adsorption materials is formed on the sand tray.

[0007] As a further solution of the present invention: the refined distillation reactor includes a reactor shell and a reactor steam inlet arranged on the reactor shell, a steam coil is provided in the reactor shell, and an end of the steam coil is connected to the reactor steam inlet.

[0008] As a further solution of the present invention: the vacuum system A includes a vacuum pump A connected to the fine distillation reactor, a condenser and a liquid phase storage tank are also provided between the vacuum pump A and the fine distillation reactor, and the vacuum pump A is also connected to the oil mist collector A through a pipeline.

[0009] As a further solution of the present invention: two pipes are provided on the condenser, and the two pipes are respectively connected to the reactor shell and the liquid phase storage tank. The liquid phase storage tank is also provided with a pipe connected to the vacuum pump A.

[0010] As a further solution of the present invention: the vacuum system B includes a vacuum pump B connected to a vacuum buffer tank through a pipeline, and the vacuum pump B is also connected to an oil mist collector B through a pipeline.

[0011] As a further solution of the present invention: the vacuum buffer tank is further provided with a second white oil delivery pump for extracting the white oil inside the vacuum buffer tank.

[0012] As a further solution of the present invention: the height of the oil outlet screen column is greater than the height of the adsorption bed.

[0013] As a further solution of the present invention: the adsorption tower and the vacuum buffer tank are connected via a pipeline.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The present application achieves the purpose of white oil purification by setting an adsorption bed on a sand tray, and secondly, sets an oil outlet screen column higher than the adsorption bed on the sand tray. Under the action of pressure, the flow direction of the white oil through the sand layer is changed to enter from the side, and the flattening operation can be omitted. When the adsorption bed reaches adsorption saturation, it is only necessary to unscrew the quick-release screws connecting the upper and lower parts of the adsorption tower, and start the stretching cylinder to separate the upper and lower parts. After pouring out the adsorption material that has reached adsorption saturation, start the stretching cylinder to combine the upper and lower parts; and restart the system to process the white oil to be processed, thereby achieving the effect of quickly replacing the adsorption bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the white oil decolorization adsorption system of the present utility model;

[0017] Figure 2 This is a schematic diagram of an adsorption tower of the present utility model;

[0018] Figure 3 This is a schematic diagram of the oil outlet screen column of the utility model;

[0019] Figure 4 This is a schematic diagram of the white oil flow direction of the utility model;

[0020] In the figure: 1. Refining distillation reactor; 11. Reactor shell; 12. Reactor steam inlet; 13. Steam coil; 2. Vacuum system A; 21. Vacuum pump A; 22. Condenser; 23. Liquid phase storage tank; 24. Oil mist collector A; 3. Adsorption tower; 31. Adsorption tower shell; 311. Upper half structure of adsorption tower; 312. Lower half structure of adsorption tower; 313. Stretching cylinder; 314. Oil outlet screen column; 315. Sand tray; 32. Compressed air inlet; 4. First white oil delivery pump; 5. Vacuum buffer tank; 6. Second white oil delivery pump; 7. Vacuum system B; 71. Vacuum pump B; 72. Oil mist collector B. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-4In an embodiment of the present invention, an adsorption system for decolorizing white oil includes a refined distillation reactor 1, an adsorption tower 3, and a vacuum buffer tank 5. The refined distillation reactor 1 and the vacuum buffer tank 5 are respectively provided with a vacuum system A2 and a vacuum system B7 matched therewith. A first white oil delivery pump 4 for controlling the flow of white oil is provided between the refined distillation reactor 1 and the adsorption tower 3. The adsorption tower 3 and the vacuum buffer tank 5 are connected by a pipeline. The white oil in the refined distillation reactor 1 enters the adsorption tower 3 through the first white oil delivery pump 4. The adsorption tower 3 includes an adsorption tower shell 31 and a vacuum system B7 provided on the adsorption tower shell. The compressed air inlet 32 ​​on the adsorption tower body 31, the adsorption tower shell 31 includes an upper half structure 311 of the adsorption tower and a lower half structure 312 of the adsorption tower. The upper half structure 311 of the adsorption tower and the lower half structure 312 of the adsorption tower are connected by a stretching cylinder 313. There are two stretching cylinders 313, and the two stretching cylinders 313 are symmetrically distributed to ensure the stability of the upper half structure 311 of the adsorption tower and the lower half structure 312 when they are separated or merged. The lower half structure 312 of the adsorption tower is adjacent to the end of the upper half structure 311 of the adsorption tower. The sand tray 315 is installed on the surface, and an adsorption bed formed by a plurality of adsorption materials is formed on the sand tray 315. The height of the oil outlet screen column 314 is greater than the height of the adsorption bed. Under the action of pressure, the flow direction of the white oil through the sand layer is changed to enter from the side, and the flattening operation can be omitted. The sand tray 315 is installed with an oil outlet screen column 314, and a plurality of micropores are opened on the oil outlet screen column 314. The micropore diameter of the oil outlet screen column 314 is smaller than the particle size of the adsorption material, which can prevent the adsorption material from escaping from the micropores and only allow the white oil to pass through, while the adsorption bed The white oil can flow out from the micropores on the oil outlet screen column 314 and enter the vacuum buffer tank 5. After the adsorption bed adsorbs a certain amount of white oil, it reaches adsorption saturation. At this time, the adsorption bed in the adsorption tower 3 needs to be replaced, the entire system is stopped, the quick-release screws connecting the upper and lower parts of the adsorption tower 3 are unscrewed, and the stretching cylinder 313 is started to separate the upper and lower parts. After pouring out the adsorption material that has reached adsorption saturation, the stretching cylinder 313 is started to combine the upper and lower parts; and the system is restarted to process the white oil to be processed, thereby achieving the effect of quickly replacing the adsorption bed.

[0023] See also Figure 1In one embodiment, in this embodiment, preferably, the fine distillation reactor 1 includes a reactor shell 11 and a reactor steam inlet 12 provided on the reactor shell 11. A steam coil 13 is provided in the reactor shell 11. The steam coil 13 is spiral-shaped and can better contact with the white oil. When the steam enters the steam coil 13, the white oil can be quickly heated. The end of the steam coil 13 is connected to the reactor steam inlet 12. Further, when the reactor shell 11 is in a vacuum state, steam is injected into the reactor steam inlet 12 for heating, usually heated to 60-70°C. As the temperature increases, the viscosity of the white oil decreases, and its fluidity will be better, which is beneficial to the adsorption treatment at the back end.

[0024] See also Figure 1 In one embodiment, in this embodiment, preferably, the vacuum system A2 includes a vacuum pump A21 connected to the distillation reactor 1, and a condenser 22 and a liquid phase storage tank 23 are further provided between the vacuum pump A21 and the distillation reactor 1. Two pipes are provided on the condenser 22, and the two pipes are respectively connected to the reactor shell 11 and the liquid phase storage tank 23. The liquid phase storage tank 23 is also provided with a pipe connected to the vacuum pump A21. The vacuum pump A21 is also connected to the oil mist collector A24 through a pipe. Furthermore, after the low volatility of the white oil and the oil mist that may be generated are sucked through the condenser 22 by the vacuum pump A21, part of the gaseous phase substances will be condensed into liquid phase and enter the liquid phase storage tank 23; the remaining gaseous part will pass through the oil mist collector A24 and be directly discharged into the air. At this time, the gas directly discharged into the air meets the standard for exhaust fume, that is, ≤50mg / m3.

[0025] See also Figure 1 In one embodiment, in this embodiment, preferably, the vacuum system B7 includes a vacuum pump B71 connected to the vacuum buffer tank 5 through a pipeline. The vacuum buffer tank 5 is also provided with a second white oil delivery pump 6 for extracting the white oil inside the vacuum buffer tank. The vacuum pump B71 is also connected to the oil mist collector B72 through a pipeline. Furthermore, when the vacuum buffer tank 5 is depressurized, the oil mist collector B72 collects the oil mist that may be generated to avoid discharging it into the atmosphere and causing oil fume pollution.

[0026] The working principle and use process of the utility model are as follows: after the white oil to be treated enters the refined distillation reactor 1, steam enters through the steam inlet 12 of the reactor to heat the white oil to be treated; at this time, the vacuum system A2 is started, and the vacuum pump A21 draws the refined distillation reactor 1 into a vacuum state. At this time, the white oil to be treated is heated in the refined distillation reactor 11 under a vacuum state, and the low volatile matter in the white oil will evaporate and separate rapidly; the low volatile matter in the white oil and the oil mist that may be generated are sucked through the condenser 22 by the vacuum pump A21, and part of the gaseous phase substances will be condensed into a liquid phase and enter the liquid phase storage tank 23; the remaining gaseous part passes through the oil mist collector A24 and is directly discharged into the air; the white oil in the refined distillation reactor 1 enters the adsorption tower 3 through the action of the first white oil delivery pump 4. When the white oil in the adsorption tower 3 reaches the set liquid level, the first white oil delivery pump 4 stops running and stops continuing to pump white oil into the adsorption tower 3; at this time, the pressure at the upper end of the adsorption tower 3 The compressed air inlet 32 ​​is opened, and compressed air is introduced to pressurize the interior of the adsorption tower 3. Under the action of pressure, the white oil passes through the adsorption bed and flows out from the micropores on the oil outlet sieve column 314; when the white oil in the adsorption tower 3 reaches the set liquid level, the vacuum buffer tank 5 and the vacuum system B7 are started simultaneously, and the vacuum pump B71 evacuates the vacuum buffer tank 5 to a vacuum state. When the white oil in the adsorption tower 3 enters the vacuum buffer tank 5 under pressure, the oil level in the vacuum buffer tank 5 gradually increases. When the set high liquid level is reached, the vacuum buffer tank 5 and the vacuum system B7 stop running, and the second white oil delivery pump 6 starts to transport the white oil in the vacuum buffer tank 5 away; when the oil level in the vacuum buffer tank 5 reaches the low liquid level setting, the vacuum system B7 automatically starts to continue extracting the white oil in the adsorption tower 3 into the vacuum buffer tank 5; when the oil level in the adsorption tower 3 reaches the low liquid level setting, the vacuum system A2 automatically stops, and the first white oil delivery pump 4 automatically starts to transport the white oil to the adsorption tower 3.

[0027] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0028] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. An adsorption system for decolorizing white oil, characterized in that: The invention comprises a refined distillation reactor (1), an adsorption tower (3), and a vacuum buffer tank (5); the refined distillation reactor (1) and the vacuum buffer tank (5) are respectively provided with a vacuum system A (2) and a vacuum system B (7) matched therewith; a first white oil delivery pump (4) for controlling the flow rate of white oil is provided between the refined distillation reactor (1) and the adsorption tower (3); the adsorption tower (3) comprises an adsorption tower shell (31) and a compressed air inlet (32) provided on the adsorption tower shell (31); The adsorption tower shell (31) comprises an upper half structure (311) and a lower half structure (312). The upper half structure (311) and the lower half structure (312) are connected via a stretching cylinder (313). A sand tray (315) is installed on the end surface of the lower half structure (312) adjacent to the upper half structure (311). An oil outlet screen column (314) is installed on the sand tray (315). An adsorption bed layer formed by accumulating a plurality of adsorption materials is formed on the sand tray (315).

2. The adsorption system for decolorizing white oil according to claim 1, characterized in that: The refined distillation reactor (1) comprises a reactor shell (11) and a reactor steam inlet (12) provided on the reactor shell (11); a steam coil (13) is provided in the reactor shell (11); and an end of the steam coil (13) is connected to the reactor steam inlet (12).

3. The adsorption system for decolorizing white oil according to claim 1, characterized in that: The vacuum system A (2) includes a vacuum pump A (21) connected to the distillation reactor (1), a condenser (22) and a liquid phase storage tank (23) are provided between the vacuum pump A (21) and the distillation reactor (1), and the vacuum pump A (21) is also connected to an oil mist collector A (24) through a pipeline.

4. The adsorption system for decolorizing white oil according to claim 3, characterized in that: The condenser (22) is provided with two pipes, and the two pipes are respectively connected to the reactor shell (11) and the liquid phase storage tank (23). The liquid phase storage tank (23) is also provided with a pipe connected to the vacuum pump A (21).

5. The adsorption system for decolorizing white oil according to claim 1, characterized in that: The vacuum system B (7) includes a vacuum pump B (71) connected to the vacuum buffer tank (5) through a pipeline, and the vacuum pump B (71) is also connected to the oil mist collector B (72) through a pipeline.

6. The adsorption system for decolorizing white oil according to claim 1, characterized in that: The vacuum buffer tank (5) is also provided with a second white oil delivery pump (6) for extracting the white oil inside the vacuum buffer tank (5).

7. The adsorption system for decolorizing white oil according to claim 1, characterized in that: The height of the oil outlet screen column (314) is greater than the height of the adsorption bed.

8. The adsorption system for decolorizing white oil according to claim 1, characterized in that: The adsorption tower (3) and the vacuum buffer tank (5) are connected via a pipeline.

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