NMP recovery and purification system and recovery and purification method thereof

A cooler and chilled water technology, which is applied to the device for coating liquid on the surface, organic chemistry, coating, etc., can solve the problems of increasing the degree of risk and increasing the burden of the company, and achieve the effect of reducing the use and reducing the burden of the enterprise

Inactive Publication Date: 2018-03-16
林州朗坤科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two commonly used NMP recovery processes: tower spray and rotary wheel. These two processes can effectively absorb, but still need to go to professional rectification equipment for further rectification and purification before they can be reused. A large number of NMP storage tanks are used to store NMP recovery liquid, which increases the burden on the company and also increases the degree of risk

Method used

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  • NMP recovery and purification system and recovery and purification method thereof

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Embodiment Construction

[0019] Such as figure 1 , a NMP recovery and purification system, the whole system of the present invention is a closed cycle, including cooling water cooler 1, chilled water cooler 2, recovery unit 3, rectification unit 4, final purification unit 5. The cooling water cooler 1, the chilled water cooler 2, and the recovery unit 3 are sealed and communicated in sequence.

[0020] The cooling water cooler 1 is provided with a cooling water inlet 6, a cooling water outlet 7, and an NMP liquid outlet A8.

[0021] The chilled water cooler 2 is provided with a chilled water inlet 9, a chilled water outlet 10, and an NMP liquid outlet B11.

[0022] The recovery unit 3 is provided with an NMP waste gas inlet 12 , an NMP return air outlet 13 and a discharge outlet 14 .

[0023] The rectification unit 4 is provided with a water vapor discharge port 15 , an NMP liquid inlet 16 , a heating medium inlet 17 , an NMP liquid outlet C18 , a heating medium outlet 19 , and a vacuum port 20 .

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Abstract

The invention discloses a NMP recovery and purification system. The whole system is in closed cycle, and comprises a cooling water cooler, a frozen water cooler, a recovery unit, a refraction unit anda final purification unit; the cooling water cooler, the frozen water cooler and the recovery unit tightly communicate in sequence; the cooling water cooler is provided with a cooling water inlet, acooling water outlet and a NMP liquid outlet A; the frozen water cooler is provided with a frozen water inlet, a frozen water outlet and a NMP liquid outlet B; and the recovery unit is provided with aNMP waste gas inlet, a NMP air return port and a discharge port. The invention further discloses a recovery and purification system using the NMP recovery and purification system. Compared with the prior art, the NMP recovery and purification system has the beneficial effects of online recovery, reduction of use of NMP storage tanks, constant recovery and relief of the enterprise burden.

Description

technical field [0001] The invention relates to a manufacturing process of a lithium battery, and mainly relates to a recovery and purification process in the drying process of a pole piece of a lithium battery. Background technique [0002] NMPN-Methylpyrrolidone is a colorless transparent oily liquid with a slight amine odor. Low volatility, good thermal and chemical stability, can volatilize with water vapor. Because of its good performance, it is widely used in the lithium battery industry. When manufacturing lithium batteries, it is necessary to coat a layer of active material on the aluminum foil and copper foil of the battery. The active material needs to be dissolved by an organic solvent and coated on the surface of the electrode sheet material, and then dried. , Detach from the negative plate. Because NMP has many advantages such as high flash point and good safety, it is widely used as an organic solvent in the lithium battery manufacturing industry. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C11/10C07D207/267
Inventor 杨俊董明赵良洁张绍康
Owner 林州朗坤科技有限公司
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