PH adjusting device in waste NMP (N-Methyl Pyrrolidone) recovery process

Abstract

The utility model relates to a PH adjusting device in the waste NMP recovery process, which comprises a hydrochloric acid tank, a liquid caustic soda tank and a raw material mixing tank, pipelines are arranged between the hydrochloric acid tank and the raw material mixing tank and between the liquid caustic soda tank and the raw material mixing tank, corresponding metering pumps are fixedly arranged on the outer surfaces of the two pipelines, adjusting valves are fixedly arranged on the outer surfaces of the two pipelines, and the adjusting valves are connected with the hydrochloric acid tank and the liquid caustic soda tank. And a discharging pipe is fixedly mounted on one side of the raw material mixing tank. According to the PH adjusting device in the waste NMP recycling process, a hydrochloric acid tank, a liquid alkali tank and raw material mixing tanks are arranged, metering pumps, corresponding pipelines and adjusting valves are arranged between the hydrochloric acid tank and the liquid alkali tank and between the raw material mixing tanks, a PH online detector is installed on a discharging pipe, the acid adding amount and the alkali adding amount are controlled through readings on the PH online detector, and the PH adjusting effect is improved. The pH value of the neutralized waste NMP solution is ensured to be 5.5-7.5; meanwhile, an acid-base access point is designed to be at a certain angle, so that the flowing path of the materials entering the raw material mixing tank is prolonged, and the mixing effect is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of pH regulating devices, in particular to a pH regulating device in a waste NMP recovery process. Background Art

[0002] In industrial processes such as lithium battery production, NMP, as a commonly used organic solvent, needs to be purified and reused through specific recovery processes after use; these processes may include steps such as heat recovery, dehumidification, filtration, condensation and activated carbon adsorption; in these recovery processes, the role of pH adjustment devices is crucial; the pH adjustment device in the waste NMP recovery process is a device used to control and adjust the pH value of the liquid in the recovery system to ensure recovery efficiency and product quality.

[0003] In the prior art, when the pH adjusting device is used, it is mostly not convenient to evenly mix the adjusting agent and the raw material. The adjusting agent is mostly poured directly into the device, resulting in excessive aggregation of the adjusting agent, which is not conducive to uniform mixing. If the acid and alkali are not fully mixed, the pH value in the local area may be too high or too low, thereby affecting the completeness of the chemical reaction, causing incomplete reaction of some raw materials, and affecting the entire process. Therefore, a pH adjusting device in the waste NMP recovery process is proposed to solve the above-mentioned problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a pH adjustment device for the waste NMP recovery process, which has the advantages of uniform mixing, etc., and solves the problem in the prior art that most pH adjustment devices are not convenient for uniformly mixing the adjustment agent and the raw material when in use, and the adjustment agent is mostly poured directly into the device, resulting in excessive aggregation of the adjustment agent, which is not conducive to uniform mixing.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a PH regulating device in the waste NMP recovery process, comprising a hydrochloric acid tank, a liquid alkali tank and a raw material mixing tank, pipelines are installed between the hydrochloric acid tank and the liquid alkali tank and the raw material mixing tank, corresponding metering pumps are fixedly installed on the outer surfaces of the two pipelines, regulating valves are fixedly installed on the outer surfaces of the two pipelines, a discharge pipe is fixedly installed on one side of the raw material mixing tank, a PH online detector is fixedly installed on the outer surface of the discharge pipe, a U-shaped sheet is fixedly installed on the inner wall of the discharge pipe, and an auxiliary component is fixedly installed inside the raw material mixing tank;

[0006] The auxiliary component includes a servo motor, which is fixedly installed on the bottom outer surface of the raw material mixing tank, a rotating rod is fixedly installed at the output shaft of the servo motor, a group of connecting rods are fixedly installed on the left and right outer surfaces of the rotating rod, and a scraper is fixedly installed between the two groups of connecting rods on opposite sides.

[0007] Preferably, a PH probe is fixedly mounted on one end of the PH online detector, and an end of the PH probe away from the PH online detector extends to the inside of the discharge pipe.

[0008] Preferably, the diameter of the U-shaped piece is one fifth of the diameter of the discharge pipe.

[0009] Preferably, the distance between the U-shaped piece and the pH probe is 20CM to 30CM.

[0010] Preferably, one end of the two pipes extends to the interior of the raw material mixing tank, and the extension length is 1CM, and the angle formed between the two pipes and the raw material mixing tank is 30 degrees.

[0011] Preferably, the raw material mixing tank is circular, and the two scrapers are both slidably connected to the inner wall of the raw material mixing tank.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] 1. The PH regulating device in the waste NMP recovery process is provided with a hydrochloric acid tank, a liquid alkali tank and a raw material mixing tank. The hydrochloric acid tank and the liquid alkali tank are respectively provided with a metering pump and a corresponding pipeline and a regulating valve between the raw material mixing tank, and a PH online detector is installed on the discharge pipe. The amount of acid and alkali added is controlled by the reading on the PH online detector to ensure that the PH value of the neutralized waste NMP solution is between 5.5 and 7.5; at the same time, the acid and alkali access points are designed to be at a certain angle to extend the flow path of the material entering the raw material mixing tank and enhance the mixing effect, and a U-shaped piece is added inside the upper side of the discharge pipe in front of the PH probe, and its size is 1 / 5 times the diameter of the discharge pipe, so as to further stabilize the mixing uniformity of the material in the discharge pipe, and the PH regulating device adopts the communication between the control component and the PH detection component to control the valve on the corresponding pipeline in real time to realize automatic control, save manpower and material resources, and ensure the control accuracy. In the subsequent distillation process of NMP, the corrosiveness to the equipment is reduced and the stability of the product is increased.

[0014] 2. The pH regulating device in the waste NMP recovery process can quickly mix the raw materials by setting auxiliary components. Under the drive of the servo motor, the rotating rod and the connecting rod are driven to rotate continuously, and the uniform mixing can ensure full contact between the reactants, thereby promoting the complete chemical reaction and avoiding incomplete reaction or side reaction caused by excessively high or low local concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2This is a cross-sectional view of the structure of the utility model;

[0017] Figure 3 This is a cross-sectional view of the discharge pipe structure of the utility model.

[0018] In the figure: 1. hydrochloric acid tank; 2. liquid alkali tank; 3. raw material mixing tank; 4. pipeline; 5. metering pump; 6. regulating valve; 7. discharge pipe; 8. PH online detector; 801. PH probe; 9. U-shaped piece; 10. auxiliary components; 1001. servo motor; 1002. rotating rod; 1003. connecting rod; 1004. scraper. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figure 1-3 In the embodiment, a pH regulating device in a waste NMP recovery process comprises a hydrochloric acid tank 1, a liquid alkali tank 2 and a raw material mixing tank 3. Pipelines 4 are installed between the hydrochloric acid tank 1 and the liquid alkali tank 2 and the raw material mixing tank 3. Corresponding metering pumps 5 are fixedly installed on the outer surfaces of the two pipelines 4. Regulating valves 6 are fixedly installed on the outer surfaces of the two pipelines 4. A discharge pipe 7 is fixedly installed on one side of the raw material mixing tank 3. A pH online detector 8 is fixedly installed on the outer surface of the discharge pipe 7. A U-shaped piece 9 is fixedly installed on the inner wall of the discharge pipe 7. An auxiliary component 10 is fixedly installed inside the raw material mixing tank 3.

[0021] It should be noted that in industrial processes such as lithium battery production, NMP, as a commonly used organic solvent, needs to be purified and reused through a specific recycling process after use. In these recycling processes, the role of the pH adjustment device is crucial. The pH adjustment device in the waste NMP recovery process is a device used to control and adjust the pH value of the liquid in the recovery system to ensure recovery efficiency and product quality. The pH adjustment device in the waste NMP recovery process can be composed of the above-mentioned hydrochloric acid tank 1, liquid alkali tank 2, raw material mixing tank 3, pipeline 4, metering pump 5, regulating valve 6, discharge pipe 7, PH online detector 8 and U-shaped piece 9.

[0022] The auxiliary component 10 includes a servo motor 1001, and the servo motor 1001 is fixedly installed on the bottom outer surface of the raw material mixing tank 3. A rotating rod 1002 is fixedly installed at the output shaft of the servo motor 1001. A group of connecting rods 1003 are fixedly installed on the left and right outer surfaces of the rotating rod 1002. A scraper 1004 is fixedly installed between the two opposite sides of the two groups of connecting rods 1003. Under the drive of the servo motor 1001, the rotating rod 1002 and the connecting rod 1003 are continuously rotated, so that the raw materials can be quickly mixed to ensure that the pH value of the solution is within the specified range, thereby meeting the standards for subsequent processing or use.

[0023] A pH probe 801 is fixedly installed at one end of the pH online detector 8, and the end of the pH probe 801 away from the pH online detector 8 extends to the inside of the discharge pipe 7. The amount of acid and alkali added is controlled by the reading on the pH online detector 8 to ensure that the pH value of the neutralized waste NMP solution is between 5.5-7.5.

[0024] The interval between the U-shaped piece 9 and the PH probe 801 is 20CM to 30CM. The diameter of the U-shaped piece 9 is one-fifth of the diameter of the discharge pipe 7. A U-shaped piece 9 is added inside the upper side of the discharge pipe 7 in front of the PH probe 801. Its size is 1 / 5 times the diameter of the discharge pipe 7 to further stabilize the mixing uniformity of the material in the discharge pipe 7.

[0025] One end of the two pipes 4 extends into the interior of the raw material mixing tank 3, and the extension length is 1CM. The angle formed between the two pipes 4 and the raw material mixing tank 3 is 30 degrees. The acid and alkali access points are designed at a certain angle to extend the flow path of the material when entering the raw material mixing tank 3 and enhance the mixing effect.

[0026] In summary, the PH regulating device in the waste NMP recovery process is provided with a hydrochloric acid tank 1, a liquid alkali tank 2 and a raw material mixing tank 3, wherein the hydrochloric acid tank 1 and the liquid alkali tank 2 are respectively provided with a metering pump 5 and a corresponding pipeline 4 and a regulating valve 6 between the raw material mixing tank 3, and a PH online detector 8 is installed on the discharge pipe 7, and the amount of acid and alkali added is controlled by the reading on the PH online detector 8 to ensure that the PH value of the neutralized waste NMP solution is between 5.5 and 7.5; at the same time, the acid and alkali access points are designed to be at a certain angle to extend the material inlet. The flow path of the raw material mixing tank 3 is improved to enhance the mixing effect, and a U-shaped piece 9 is added inside the upper side of the discharge pipe 7 in front of the pH probe 801, the size of which is 1 / 5 times the diameter of the discharge pipe 7, to further stabilize the mixing uniformity of the materials in the discharge pipe 7, and a pH adjustment device is added to control the valve on the corresponding pipeline 4 in real time through communication between the control component and the pH detection component to achieve automatic control, saving manpower and material resources, ensuring control accuracy, and reducing the corrosiveness of NMP to equipment in the subsequent distillation process, thereby increasing the stability of the product.

[0027] Furthermore, by providing the auxiliary component 10, the rotating rod 1002 and the connecting rod 1003 are driven by the servo motor 1001 to continuously rotate, so that the raw materials can be quickly mixed. The uniform mixing can ensure sufficient contact between the reactants, thereby promoting the complete chemical reaction and avoiding incomplete reaction or side reactions caused by excessively high or low local concentrations.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pH regulating device in a waste NMP recovery process, comprising a hydrochloric acid tank (1), a liquid alkali tank (2) and a raw material mixing tank (3), characterized in that: A pipeline (4) is installed between the hydrochloric acid tank (1) and the liquid alkali tank (2) and the raw material mixing tank (3); corresponding metering pumps (5) are fixedly installed on the outer surfaces of the two pipelines (4); regulating valves (6) are fixedly installed on the outer surfaces of the two pipelines (4); a discharge pipe (7) is fixedly installed on one side of the raw material mixing tank (3); a PH online detector (8) is fixedly installed on the outer surface of the discharge pipe (7); a U-shaped sheet (9) is fixedly installed on the inner wall of the discharge pipe (7); and an auxiliary component (10) is fixedly installed inside the raw material mixing tank (3); The auxiliary component (10) comprises a servo motor (1001), the servo motor (1001) is fixedly mounted on the outer surface of the bottom of the raw material mixing tank (3), a rotating rod (1002) is fixedly mounted at the output shaft of the servo motor (1001), a group of connecting rods (1003) are fixedly mounted on the outer surfaces of the left and right sides of the rotating rod (1002), and a scraper (1004) is fixedly mounted between the two groups of connecting rods (1003) on opposite sides.

2. The pH regulating device in a waste NMP recovery process according to claim 1, characterized in that: A PH probe (801) is fixedly mounted on one end of the PH online detector (8), and an end of the PH probe (801) away from the PH online detector (8) extends to the inside of the discharge pipe (7).

3. The pH regulating device in a waste NMP recovery process according to claim 1, characterized in that: The diameter of the U-shaped piece (9) is one fifth of the diameter of the discharge pipe (7).

4. The pH regulating device in a waste NMP recovery process according to claim 2, characterized in that: The distance between the U-shaped piece (9) and the pH probe (801) is 20CM to 30CM.

5. The pH regulating device in a waste NMP recovery process according to claim 1, characterized in that: One end of the two pipes (4) extends into the interior of the raw material mixing tank (3), and the length of the extension is 1 cm, and the angle formed between the two pipes (4) and the raw material mixing tank (3) is 30 degrees.

6. The pH regulating device in a waste NMP recovery process according to claim 1, characterized in that: The raw material mixing tank (3) is circular, and the two scrapers (1004) are both slidably connected to the inner wall of the raw material mixing tank (3).

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