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A kind of method and system thereof for recovering production solvent from nmp waste liquid

A waste liquid recovery and solvent technology, which is applied in the direction of organic chemistry, can solve the problems that the purity of NMP products in the second tower cannot be guaranteed, the waste water, tail gas and still residue cannot be effectively used, and the stability of the process is reduced, so as to save steam energy consumption, significant economic benefits, and environmentally friendly effects

Active Publication Date: 2021-10-08
南京佳华科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if high-purity NMP products are to be obtained, the dehydration rate in the process is extremely high, and NMP has a high boiling point, so the process requires a large reflux ratio, resulting in high energy consumption for the process, and once a tower fluctuates , the purity of the NMP product in the second tower cannot be guaranteed, which reduces the stability of the process. In particular, the waste water, tail gas and kettle residue produced by the device cannot be effectively utilized, causing secondary pollution to the environment, especially when the large reflux ratio consumes a lot of energy. high

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  • A kind of method and system thereof for recovering production solvent from nmp waste liquid

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Effect test

Embodiment 1

[0036] Embodiment 1: as figure 1 As shown, a system for recovering NMP waste liquid includes a raw material preheater 1, a deoxygenation tank 2, a dehydration tower 3, and a rectification tower 6. The specific recycling method includes the following steps:

[0037] Step 1. Raw material preheating: pump the waste liquid from the NMP waste liquid storage tank to the pre-raw material heater 1 for preheating;

[0038] Step 2. Deoxidation treatment: put the NMP waste liquid preheated in step 1 into the deoxidation tank 2 for deoxidation and non-condensable gas treatment. The operating temperature of the deoxidation tank 2 is 45°C and the operating pressure is -0.1MPa;

[0039] Step 3. Dehydration treatment: NMP waste liquid after deoxidation treatment is pumped to dehydration tower 3 for dehydration treatment. The temperature at the top of the dehydration tower is 50°C, the temperature of the bottom of the dehydration tower is 120°C, and the pressure at the top of the dehydration ...

Embodiment 2

[0044] Such as figure 1 As shown, a system for recovering NMP waste liquid includes a raw material preheater 1, a deoxygenation tank 2, a dehydration tower 3, and a rectification tower 6. The specific recycling method includes the following steps:

[0045] Step 1. Raw material preheating: pump the waste liquid from the NMP waste liquid storage tank to the raw material preheater 1 for preheating;

[0046] Step 2. Deoxidation treatment: put the NMP waste liquid preheated in step 1 into the deoxidation tank 2 for deoxidation and non-condensable gas treatment. The operating temperature of the deoxidation tank 2 is 45°C and the operating pressure is -0.08MPa;

[0047] Step 3. Dehydration treatment: NMP waste liquid after deoxidation treatment is pumped to dehydration tower 3 for dehydration treatment. The temperature at the top of the dehydration tower is 60°C, the temperature of the bottom of the dehydration tower 3 is 130°C, and the pressure at the top of the dehydration tower 3...

Embodiment 3

[0052] Such as figure 1 As shown, a system for recovering NMP waste liquid includes a raw material preheater 1, a deoxygenation tank 2, a dehydration tower 3, and a rectification tower 6. The specific recycling method includes the following steps:

[0053] Step 1. Raw material preheating: pump the waste liquid from the NMP waste liquid storage tank to the raw material preheater 1 for preheating;

[0054] Step 2. Deoxidation treatment: put the NMP waste liquid preheated in step 1 into the deoxidation tank 2 for deoxidation and non-condensable gas treatment. The operating temperature of the deoxidation tank 2 is 65°C and the operating pressure is -0.09MPa;

[0055] Step 3. Dehydration treatment: NMP waste liquid after deoxidation treatment is pumped to dehydration tower 3 for dehydration treatment. The temperature at the top of dehydration tower 3 is 55°C, the temperature at the bottom of the dehydration tower is 125°C, and the pressure at the top of the dehydration tower is co...

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Abstract

The invention discloses a method and system for recycling and producing ultra-clean and high-purity solvents from NMP waste liquid, which belongs to the hazardous waste recycling industry and is subdivided into the field of NMP recycling in the lithium-ion battery industry, aiming to provide a low-investment, low-energy-consumption , while reducing environmental pollution, the method and system for recovering high-purity NMP products, the main points of the technical scheme are as follows, step 1. raw material preheating, step 2. deoxidation treatment, step 3. dehydration treatment, step 4. rectification treatment, Step 5. Refining treatment, after collecting the residual liquid in the refining tower kettle, the NMP is further deeply recovered in the wiped film evaporator, and the heavy components that cannot be recovered are sent out for treatment. A system for recovering and producing ultra-high-purity solvent from NMP waste liquid is characterized in that it includes: a raw material preheating device, a deoxidizing device, a dehydrating device, a rectifying device, a refining device, and a tail gas treatment device.

Description

technical field [0001] The invention relates to the hazardous waste treatment industry, and also to the field of NMP waste liquid recovery in the lithium ion battery industry, in particular to a method and system for recycling NMP waste liquid to produce high-purity solvents. Background technique [0002] NMP, also known as N-methyl-2-pyrrolidone (English name: N-methyl-2-pyrrolidone, NMP), is a colorless transparent oily liquid with a slight amine smell. It is miscible with water, alcohol, ether, ester, ketone, halogenated hydrocarbon, aromatic hydrocarbon and castor oil, and is a commonly used organic solvent in the chemical field. It has low volatility, good thermal and chemical stability, can volatilize with water vapor, has hygroscopicity and is sensitive to light. [0003] NMP is a polar solvent with strong selectivity and good stability and an important chemical raw material. It is also a polar aprotic solvent with low viscosity, low volatility, good stability, low t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 黄小康赵怡谢佳华高云山王健魏韵高露芹贾涛刘应庆
Owner 南京佳华科技股份有限公司
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