Method and system for purifying NMP in coating process of lithium ion battery

A technology of lithium-ion batteries and purification methods, which is applied in the field of NMP purification methods and systems in the coating process of lithium-ion batteries, can solve the problems of ineffective recycling, inconvenient production docking, and increased costs, so as to ensure product quality consistency, The effect of reducing procurement costs and reducing energy consumption

Active Publication Date: 2021-12-14
深圳市德尼环境技术有限公司
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Problems solved by technology

[0009]The existing technology has the following problems: the structure is complicated, it is inconvenient to connect with production, and it cannot be recycled effectively, which increases the cost

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  • Method and system for purifying NMP in coating process of lithium ion battery
  • Method and system for purifying NMP in coating process of lithium ion battery

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Embodiment Construction

[0056] Below in conjunction with specific examples, further illustrate the present invention, the examples are implemented under the premise of the technical solutions of the present invention, it should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0057] see figure 1 , in an embodiment of the present invention, a lithium-ion battery coating process NMP purification method, comprising the following steps:

[0058] S1: initial condensation, that is, the high-temperature exhaust gas containing NMP is condensed through the pre-cooling surface cooler 3, and a small amount of NMP liquid is condensed and sent to the first NMP liquid storage tank 5;

[0059] S2: gas compression, that is, the exhaust gas after the initial condensation is compressed by the compressor 4;

[0060] S3: Separating NMP, that is, separating the exhaust gas compressed by the compressor 4 through the sep...

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Abstract

The invention discloses a method and a system for purifying NMP in coating process of a lithium ion battery, and belongs to the field of NMP purification. The NMP purification method comprises the following steps: S1, primary condensation, S2, gas compression, S3, NMP separation, S4, NMP collection, S5, high boiling point impurity separation, and S6, NMP pure liquid obtaining. The NMP purification system comprises a pre-cooling surface air cooler, a first NMP liquid storage tank, a compressor, a separation assembly, a pressure buffer assembly, a negative pressure flash tank, a vacuum pump, a vacuum condenser and an NMP pure liquid tank, the pre-cooling surface air cooler is connected with the compressor and the first NMP liquid storage tank, the compressor is connected with the separation assembly, the separation assembly is connected with the pressure buffer assembly, the pressure buffer assembly is connected with the negative pressure flash tank, the negative pressure flash tank is connected with the vacuum pump, and the vacuum condenser is connected between the vacuum pump and the negative pressure flash tank. According to the invention, the system structure can be simplified, recovery and purification are facilitated, then butt joint with production is facilitated, effective recycling of NMP is realized, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of NMP recovery and purification, in particular to an NMP purification method and system in a lithium-ion battery coating process. Background technique [0002] N-methylpyrrolidone (NMP), Chinese alias 1-methyl-2-pyrrolidone or N-methyl-2-pyrrolidone, is a colorless transparent oily liquid with a slight amine smell; low volatility, thermal stability, Good chemical stability, can volatilize with water vapor; hygroscopic; sensitive to light; easily soluble in water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, can dissolve most organic and inorganic compounds, polar Gases, natural and synthetic polymer compounds. N-Methylpyrrolidone is widely used in lithium batteries, medicine, pesticides, pigments, cleaning agents, insulating materials and other industries. [0003] In the manufacture of lithium batteries, the positive electrode material is fully stirred with NMP to form a slurry, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267B01D53/22
CPCC07D207/267B01D53/228B01D53/226Y02E60/10
Inventor 齐峻岭余杰华林新芳
Owner 深圳市德尼环境技术有限公司
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