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NMP waste liquid recovery process

A waste liquid recovery and process technology, applied in the direction of organic chemistry, can solve the problems of process redundancy, high energy consumption and investment costs, achieve high purity, reduce energy consumption and investment costs, and ensure gas-liquid mass transfer and transfer hot effect

Active Publication Date: 2020-05-19
重庆中润新材料股份有限公司
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  • 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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  • 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 particularly discloses an NMP waste liquid recovery process. The process comprises the following two steps: dehydration treatmentand heavy component removal treatment. In the step of the dehydration treatment, NMP waste liquid is pumped into a vacuum dehydration tower and subjected to negative-pressure rectification, then wateris discharged from the top of the vacuum dehydration tower and is condensed, one part of a formed condensate is discharged as wastewater, the other part of the condensate flows back to the vacuum dehydration tower, a reflux ratio is 0.60-0.65, and a crude NMP material is discharged from the bottom of the vacuum dehydration tower. In the step of the heavy component removal treatment, the crude NMPmaterial discharged from the bottom of the vacuum dehydration tower is fed into a finished product tower and undergoes negative-pressure heavy component removal, an obtained NMP gas phase is discharged from the top of the finished product tower and then condensed, a part of a formed condensate is conveyed out as a product, and the other part of the condensate flows back into a product tower at areflux ratio of 0.50-0.55. By the adoption of such a technical scheme, the problems that in the prior art, technological processes are redundant, and energy consumption and investment cost are high are solved.

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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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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