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Recycled feed liquid rectification and purification system containing NMP (N-Methyl Pyrrolidone)

A technology for recycling materials and rectification, which is applied in the field of rectification and purification systems for recycled materials and liquids, can solve the problems of difficulty in sewage treatment load, difficulty in secondary utilization, low purity and quality, etc., and achieve sustainable utilization, significant economic benefits and Environmental benefits, the effect of reducing production costs

Active Publication Date: 2022-05-10
派尔森环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of cleaning NMP as a solvent, a large amount of NMP waste liquid containing impurities and water will be produced, and the purity and quality are low. Disposal will waste a lot of resources and also increase the load and difficulty of subsequent sewage treatment

Method used

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  • Recycled feed liquid rectification and purification system containing NMP (N-Methyl Pyrrolidone)
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  • Recycled feed liquid rectification and purification system containing NMP (N-Methyl Pyrrolidone)

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Embodiment 1

[0041] This embodiment is a rectification and purification system for recovered feed liquid containing NMP, which includes an industrial-grade NMP rectification unit and an electronic-grade NMP purification unit connected in sequence.

[0042] 1. Industrial grade NMP distillation unit section

[0043] Such as figure 1 As shown, the industrial-grade NMP rectification unit includes a first-stage negative pressure dehydration section, a first-stage negative pressure light removal section, and a first NMP refining section connected in sequence through pipelines.

[0044] Ⅰ: First-level negative pressure dehydration section

[0045] The primary negative pressure dehydration section includes primary negative pressure dehydration tower T1-01, primary negative pressure dehydration tower condenser E1-01, primary negative pressure dehydration tower recondenser E1-02, dehydration tower vacuum system P1-04, The first-stage negative pressure dehydration tower reflux tank V1-01.

[0046]...

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Abstract

The invention discloses an NMP-containing recovered feed liquid rectification and purification system, which comprises an industrial-grade NMP rectification unit and an electronic-grade NMP purification unit which are connected in sequence, and the industrial-grade NMP rectification unit comprises a first-grade negative pressure dehydration section, a first-grade negative pressure light removal section and a first NMP refining section which are connected in sequence through pipelines; and the electronic-grade NMP purification unit comprises a second-stage negative pressure light removal section, a second NMP refining section and a third NMP refining section which are sequentially connected through pipelines. The preparation process is easy to control, the impurity-containing NMP cleaning solution recycled in the lithium ion battery preparation process can be purified to reach the electronic-grade quality through the system, secondary utilization is achieved, meanwhile, the difficulty of rear-end sewage treatment is reduced, and the economic added value of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of purification and production of lithium-ion battery electrolyte, and in particular relates to a rectification and purification system for recycled feed liquid containing NMP. Background technique [0002] NMP (N-Methylpyrrolidone) is a colorless and transparent liquid with good chemical and thermal stability, high polarity, low volatility, and infinite miscibility with water and many organic solvents. It is the most commonly used and very important One of the lithium-ion battery auxiliary materials. The solvent that is widely used in the front-end batching process of lithium-ion batteries, as a PVDF solvent, participates in the dispersion of the slurry, forms a uniform medium, and maintains a stable slurry for a long time within a certain viscosity range. It is used as a slurry in the coating stage The main liquid carrier, in the coating and baking stage, NMP undertakes the function of creating pores. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14C07D207/267
CPCB01D3/143C07D207/267
Inventor 李毅李虎林蔡建荣晏卫荣王磊王宇郑成
Owner 派尔森环保科技有限公司
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