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Device and process for recovering waste solvent generated in wet-process production of battery separators

A technology of battery diaphragm and recovery device, which is applied in the direction of only multi-stage serial refining process treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., to achieve the effects of high reliability, simple manufacturing process, and consistent pore size

Active Publication Date: 2015-04-01
中材锂膜(常德)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, domestic manufacturers of lithium-ion diaphragms have not effectively recycled waste solvent raw materials, and completely rely on imports for supplementation.

Method used

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  • Device and process for recovering waste solvent generated in wet-process production of battery separators
  • Device and process for recovering waste solvent generated in wet-process production of battery separators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Collect the mixture containing dichloromethane, paraffin oil and water discharged from the wet process lithium ion battery diaphragm production line into the mixed liquid storage tank 1, and let it stand naturally for 10 minutes, so that part of the wastewater is easily separated from the dichloromethane and paraffin oil; The mixture containing dichloromethane, paraffin oil and water is transported to the first-stage circulating heating tower 3 through the mixed liquid delivery pump 2; the temperature in the first-stage circulating heating tower 3 is adjusted to 120°C, and the dichloromethane, The mixture of paraffin oil and water undergoes high-temperature evaporation. The evaporated gas is condensed in the environment of 40°C at the top of the first-stage circulating heating tower 3. After an interval of 1 minute, the mixed liquid circulating pump 6 is started, and the first-stage circulating heating tower 3 The material from the lower part is transported to the upper p...

Embodiment 2

[0021] Collect the mixture containing dichloromethane, paraffin oil and water discharged from the wet process lithium ion battery diaphragm production line into the mixed liquid storage tank 1, and let it naturally stand for 30 minutes, so that part of the waste water is easily separated from the dichloromethane and paraffin oil; The mixture containing dichloromethane, paraffin oil and water is transported to the first-stage circulating heating tower 3 through the mixed liquid delivery pump 2; the temperature in the first-stage circulating heating tower 3 is adjusted to 130°C, and the dichloromethane, The mixture of paraffin oil and water is evaporated at high temperature. The evaporated gas is condensed in the environment of 50℃ at the top of the first-stage circulating heating tower 3. After an interval of 2 minutes, the mixed liquid circulating pump 6 is started to turn the first-stage circulating heating tower 3 The material in the lower part is transported to the upper part...

Embodiment 3

[0023] Collect the mixture containing dichloromethane, paraffin oil and water discharged from the wet process lithium ion battery diaphragm production line into the mixed liquid storage tank 1, and let it stand for 20 minutes, so that part of the wastewater is easily separated from the dichloromethane and paraffin oil; The mixture containing dichloromethane, paraffin oil and water is transported to the first-stage circulating heating tower 3 through the mixed liquid transfer pump 2; the temperature in the first-stage circulating heating tower 3 is adjusted to 125°C, which will contain methylene chloride, The mixture of paraffin oil and water is evaporated at high temperature. The evaporated gas is condensed in the 45℃ environment at the top of the first-stage circulating heating tower 3. After an interval of 2 minutes, the mixed liquid circulating pump 6 is started to turn the first-stage circulating heating tower 3 The material from the lower part is transported to the upper pa...

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Abstract

The invention relates to a process for recovering a waste solvent generated in wet-process production of battery separators. Waste dichloromethane, wastewater and waste paraffin oil generated in extraction stage of the production process are subjected to processes including high-temperature negative-pressure distillation, a gas-phase condensation and oil-liquid separation and dichloromethane having a purity of 99.95% and paraffin oil having a purity of 99.99% are finally obtained and the wastewater meets environment-friendly emission standards. A set of recovery system disclosed by the invention has the advantages of inexpensive finished products, relatively small energy consumption and easiness in operation, has broad application prospects and brings significant cost revolution for wet-process production of domestic lithium-ion separators.

Description

Technical field [0001] The invention relates to a mixed solution separation device and process, in particular to a recovery device and process for waste solvents produced by wet production of battery diaphragms. Background technique [0002] At present, domestic manufacturers of lithium ion membranes have not effectively recycled the waste solvent raw materials, and completely rely on imports for supplementation. [0003] At present, a mixture of dichloromethane, paraffin oil, and water is produced in the process of producing lithium ion battery separators by wet method. At present, most companies directly discharge these three kinds of boring mixtures directly. The investment in environmental protection is very large. These three materials are the raw materials for the production of lithium-ion battery separators. Through reasonable separation and recycling, production costs can be effectively reduced, raw material consumption is saved, and production is greatly facilitated. Summ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07C19/03C07C17/38C10G53/02
Inventor 高保清舒均国
Owner 中材锂膜(常德)有限公司
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