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A method and device for recovering n-methylpyrrolidone waste gas from lithium battery production by membrane separation

A technology of methylpyrrolidone and membrane separation method, which is applied in the direction of separation method, semipermeable membrane separation, and dispersed particle separation, etc. It can solve the problems that the waste gas recovery method cannot recover NMP solvent well, mix it in, and reduce energy consumption , improve the recovery quality and purity

Active Publication Date: 2019-11-01
江苏旭一高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem actually solved by the present invention is: the waste gas containing NMP that can be produced in the production process of the lithium battery anode, the conventional waste gas recovery method cannot recycle the NMP solvent of higher purity preferably, the present invention proposes a kind of lithium The recovery method of waste gas in battery electrode production is based on absorption and membrane separation to recover NMP waste gas in lithium battery production.

Method used

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  • A method and device for recovering n-methylpyrrolidone waste gas from lithium battery production by membrane separation
  • A method and device for recovering n-methylpyrrolidone waste gas from lithium battery production by membrane separation

Examples

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Effect test

Embodiment 1

[0039] The NMP waste gas from the lithium battery pole piece drying box 1 is sent to the absorption tower 3 by the blower device 2, and water is used as a solvent to absorb the waste gas. The temperature of the absorption liquid is controlled between 35 and 45°C, and the water is continuously circulated. When the NMP concentration in the absorption liquid at the bottom of the tower reached 80wt%, the NMP waste liquid at the bottom of the absorption tower 3 entered the circulation tank 5 through the infusion pump 4, and entered the porous ceramic membrane 7 through the circulation pump 6. The average pore size is 5nm, the operation mode is cross-flow filtration, the operating pressure is 0.5MPa, and the operating temperature is 40°C. The intercepted liquid is returned to the circulation tank 5, and the filtered NMP-water clear liquid is stored in the clear liquid tank 8, and is fed to the feed liquid pump 9 The NMP-clear water is heated to 90°C and enters the water-permeable NaA...

Embodiment 2

[0041] The NMP waste gas from the lithium battery pole piece drying box 1 is sent to the absorption tower 3 by the blower device 2, and water is used as a solvent to absorb the waste gas. The temperature of the absorption liquid is controlled between 35 and 45°C, and the water is continuously circulated. When the NMP concentration in the absorption liquid at the bottom of the tower reaches 75wt%, the NMP waste liquid at the bottom of the absorption tower enters the circulation tank 5 through the infusion pump 4, and enters the porous ceramic membrane 7 through the circulation pump 6. The pore size is 10nm, the operation mode is cross-flow filtration, the operating pressure is 0.4MPa, and the operating temperature is 35°C. The intercepted liquid is returned to the circulation tank 5, and the filtered NMP-water clear liquid is stored in the clear liquid tank 8, and is fed into the feed liquid pump 9. Under the action, it enters the heater 10, and the NMP-clear water is heated to ...

Embodiment 3

[0043] The NMP waste gas from the lithium battery pole piece drying box 1 is sent to the absorption tower 3 by the blower device 2, and water is used as a solvent to absorb the waste gas. The temperature of the absorption liquid is controlled between 35 and 45°C, and the water is continuously circulated. When the NMP concentration in the absorption liquid at the bottom of the tower reaches 80wt%, the NMP waste liquid at the bottom of the absorption tower enters the circulation tank 5 through the infusion pump 4, and enters the porous ceramic membrane 7 through the circulation pump 6, and the average of the porous ceramic membrane 7 The pore size is 20nm, the operation mode is cross-flow filtration, the operating pressure is 0.2MPa, and the operating temperature is 30°C. The intercepted liquid is returned to the circulation tank 5, and the filtered NMP-water clear liquid is stored in the clear liquid tank 8, and in the feed liquid pump 9 Under the action, it enters the heater 10...

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Abstract

The invention relates to a technology for recovering NMP (N-methyl pyrrolidone) waste gas in lithium battery production with a membrane separation method and belongs to the technical field of organicwaste gas recovery. The technology comprises steps as follows: NMP waste gas in a lithium battery pole piece drying box is fed into an absorption tower by blast apparatus and absorbed by utilizing water as a solvent, NMP effluent is formed at the bottom of the absorption tower and enters a porous ceramic filtering membrane separator through a circulating pump, NMP and water penetrate through a porous ceramic filtering membrane under the action of pressure difference before and after NMP and water penetrate through the porous ceramic filtering membrane, an NMP-water clear liquid is formed on the rear side of the porous ceramic filtering membrane, and an intercepted liquid returns to a circulating tank; the NMP-water clear liquid is stored in a clear liquid tank and enters a heater for heating under the action of a feed pump; when the heated clear liquid passes through a pervaporation membrane, water penetrates through the membrane while NMP is intercepted, and accordingly, NMP and waterare separated. The operating temperature is lower than the boiling point of an NMP recovered liquid in the recovery process, recovered NMP does not need high temperature and negative pressure and haslow probability of producing new impurities, energy consumption is low, operation is simple, and the technology is a green NMP waste gas recovery technology.

Description

technical field [0001] The invention relates to a membrane separation method for recovering N-methylpyrrolidone waste gas from lithium battery production, in particular to a method for coupling ceramic filter membranes and water-permeable pervaporation membranes to recover N-methylpyrrolidone, which is a novel, Clean, energy-saving N-methylpyrrolidone waste gas recovery process. Background technique [0002] N-methylpyrrolidone (NMP) is a polar aprotic solvent with low volatility, good chemical stability, and good solubility to the binder PDVF, and is widely used as an auxiliary material for lithium battery anodes . With the rapid development of the lithium battery industry in recent years, the usage of N-methylpyrrolidone is increasing. However, choose NMP to dissolve PVDF and make a slurry with the positive electrode powder material of lithium battery. The slurry is coated on the aluminum foil, and the air containing NMP will be generated during the drying process of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/18B01D61/00B01D71/02B01D69/02
Inventor 顾学红仲超洪周杨龙
Owner 江苏旭一高科技有限公司
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