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A kind of nmp waste liquid recovery process

A waste liquid recovery and process technology, applied in organic chemistry and other directions, can solve the problems of process redundancy, high energy consumption and investment costs

Active Publication Date: 2021-04-09
重庆中润新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a NMP waste liquid recovery process to solve the problems of redundant process flow, high energy consumption and high investment costs in the prior art

Method used

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  • A kind of nmp waste liquid recovery process
  • A kind of nmp waste liquid recovery process
  • A kind of nmp waste liquid recovery process

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Embodiment Construction

[0037] The following is further described in detail through specific implementation methods:

[0038] The reference signs in the drawings of the description include: waste liquid storage tank 1, first feed pump 2, vacuum dehydration tower 3, first condenser 4, first reflux tank 5, first reboiler 6, first vacuum System 7, second feed pump 8, product column 9, second condenser 10, second reflux tank 11, product storage tank 12, product pump 13, second reboiler 14, heavy component storage tank 15, heavy component Outgoing pump 16, second vacuum system 17, tower base 101, tower kettle 102, tower body 103, stripping section 104, rectifying section 105, conical section 106, tower top 107, discharge pipe 108, steam pipe 109 , Connecting pipe 110, feed pipe 111, discharge hole 112, return pipe 113, grid plate 114, air outlet 115, diversion bar 116, diversion groove 117.

[0039] combine figure 1 As shown in the flowchart, the equipment used in the embodiment includes a waste liquid ...

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Abstract

The invention relates to the technical field of NMP purification, and specifically discloses a recovery process of NMP waste liquid, which includes two steps of dehydration treatment and weight removal treatment. The final water is discharged from the top of the vacuum dehydration tower and condensed, and part of the formed condensate is discharged as waste water, and the other part is refluxed into the vacuum dehydration tower with a reflux ratio of 0.60 to 0.65. The crude NMP material is discharged from the bottom of the vacuum dehydration tower; weight removal treatment The steps are: send the crude NMP material discharged from the bottom of the vacuum dehydration tower into the finished product tower, and after negative pressure deweighting, the NMP gas phase is discharged from the top of the finished product tower to be condensed, and part of the formed condensate is sent out as a product, and the other part is refluxed into the product In the tower, the reflux ratio is 0.50-0.55. Adopting the technical solution in this patent solves the problems of redundant process flow, high energy consumption and high investment cost in the prior art.

Description

technical field [0001] The invention relates to the technical field of NMP purification, in particular to a recovery process for NMP waste liquid. Background technique [0002] NMP is a polar aprotic solvent, which has the advantages of high boiling point, strong permeability, low toxicity, low volatility, excellent chemical and thermal stability, strong solubility, and recyclability. Now it has become a lithium solvent. An indispensable organic solvent in the battery industry. [0003] In the coating process of lithium battery positive electrode sheet production, NMP is used as the main liquid carrier of the slurry, and is evenly coated on the metal substrate with a stable thickness, and has good wettability and fluidity with the metal substrate. Generally, NMP is recovered by water washing and condensation in lithium battery production plants, and the NMP waste liquid recovered by water washing and condensation needs to be purified to a composition >99.9wt% before it c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 丁龙奇刘玥彤郑会生
Owner 重庆中润新材料股份有限公司
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