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Method for precision treatment of NMP recovery and purification in production of lithium battery

A lithium battery, sophisticated technology, applied in organic chemistry and other directions, can solve the problems of low NMP purity, environmental pollution, waste of NMP raw materials, etc., and achieve the effect of improving utilization, improving elution rate, and small emission

Active Publication Date: 2018-11-09
TIANJIN ZHONGFU ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] N-Methylpyrrolidone, the English name N-Methylpyrrolidone, namely NMP, is an important chemical raw material, a polar solvent with strong selectivity and good stability, and a solvent commonly used in the production process of lithium batteries. In the battery production process, NMP is often used as a solvent when making lithium battery positive and negative electrode materials and lithium battery separators. In the production process, with the production of lithium battery positive and negative electrode materials and separators, the NMP solvent used continues to volatilize. Usually in the production process, the volatilized NMP will be sucked away, absorbed and then discharged, which will cause a serious waste of NMP raw materials and also cause environmental pollution. Therefore, it is necessary to recycle the volatilized NMP gas to improve NMP. However, when preparing electrode materials, a part of heavy impurity compounds, metal ions, free amines, etc. will be taken out with the volatilization of the solvent, and the purity of recovered NMP is very low, and there are absorbents, heavy Impurities such as heterocompounds, metal ions, and free amines prevent the recovered NMP from being directly used as a solvent for reuse

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  • Method for precision treatment of NMP recovery and purification in production of lithium battery

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Embodiment 1

[0052] The NMP recovery and purification precision treatment method described in this embodiment uses the above-mentioned NMP recovery and purification precision treatment device, comprising the following steps:

[0053] Sorbent preparation

[0054] Add 2wt% attapulgite clay and 60mL toluene to the three-necked flask, then add 10wt% acrylamide, then add azobisisobutyronitrile as an initiator, react at 70 degrees for 6h, and separate the product by filtration with toluene , absolute ethanol and deionized water to obtain polyacrylamide-attapulgite clay composite adsorption material. Take 40 parts of activated carbon, 18 parts of polyacrylamide-attapulgite clay composite material, 15 parts of diatomaceous earth and 10 parts of MCM-41 mesoporous molecular sieve, and physically mix them uniformly to obtain an adsorbent.

[0055] The first step is to use water as the absorbent and use the absorption tower to recover the NMP waste gas volatilized during the production of lithium bat...

Embodiment 2

[0061] The NMP recovery and purification precision treatment method described in this embodiment uses the above-mentioned NMP recovery and purification precision treatment device, comprising the following steps:

[0062] Sorbent preparation

[0063] Add 5wt% attapulgite clay and 50mL toluene to the three-necked flask, then add 15wt% acrylamide, then add azobisisobutyronitrile as an initiator, react at 70°C for 6h, and separate the product by filtration with toluene , absolute ethanol and deionized water to obtain polyacrylamide-attapulgite clay composite adsorption material. Take 60 parts of activated carbon, 32 parts of polyacrylamide-attapulgite clay composite material, 25 parts of diatomaceous earth and 25 parts of SBA-15 molecular sieve, and physically mix them uniformly to obtain an adsorbent.

[0064] The first step is to use water as the absorbent and use the absorption tower to recover the NMP waste gas volatilized during the production of lithium battery separators o...

Embodiment 3

[0070] The method for NMP recovery and purification precision treatment described in the present embodiment uses the above-mentioned device for NMP recovery and purification precision treatment, comprising the following steps:

[0071] Sorbent preparation

[0072] Add 8wt% attapulgite clay and 70mL of toluene to the three-necked flask, then add 12wt% acrylamide, and then add azobisisobutyronitrile as an initiator, react at 70 degrees for 6h, and filter and separate the product with toluene , absolute ethanol and deionized water to obtain polyacrylamide-attapulgite clay composite adsorption material. Take 50 parts of activated carbon, 24 parts of polyacrylamide-attapulgite clay composite material, 18 parts of diatomaceous earth and 18 parts of MCM-41 mesoporous molecular sieve, and physically mix them uniformly to obtain an adsorbent.

[0073] The first step is to use water as the absorbent and use the absorption tower to recover the NMP waste gas volatilized during the produc...

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Abstract

The invention provides a method for precision treatment of NMP recovery and purification in production of lithium batteries, including: absorbing NMP waste gas with water to obtain NMP waste liquid; and inputting the NMP waste liquid into a first dehydration rectification column for separation; and heavy component extracted by a column reactor of the first dehydration rectification column is inputto a second dehydration rectification column for separation; heavy component extracted by a column reactor of the second dehydration rectification column is input to an NMP rectification column for separation; light component extracted by tower top of the NMP rectification column is adsorbed by an adsorbent to remove water and heavy miscellaneous components, the treated NMP is obtained; the adsorbent is prepared from activated carbon, polyacrylamide-attapulgite clay composite material, diatomaceous earth and molecular sieve. The method adopts three columns in series and the precision treatment by an adsorption tower to recover and purify the NMP waste gas in the production of lithium batteries into an electronic grade NMP solvent, and the solvent can be directly used as a solvent for thepositive and negative materials in the production of the lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium battery production, and in particular relates to a method for recovering, purifying and precisely treating NMP in lithium battery production. Background technique [0002] N-Methylpyrrolidone, the English name N-Methylpyrrolidone, namely NMP, is an important chemical raw material, a polar solvent with strong selectivity and good stability, and a solvent commonly used in the production process of lithium batteries. In the battery production process, NMP is often used as a solvent when making lithium battery positive and negative electrode materials and lithium battery separators. In the production process, with the production of lithium battery positive and negative electrode materials and separators, the NMP solvent used continues to volatilize. Usually in the production process, the volatilized NMP will be sucked away, absorbed and then discharged, which will cause a serious waste of NMP raw mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 陈德辉陆丁丁隋然郑晓舟
Owner TIANJIN ZHONGFU ENG TECH
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