N-methylpyrrolidone decompression and purification system and purification method

A technology of methylpyrrolidone and purification method, which is applied in N-methylpyrrolidone decompression purification system and purification field, which can solve the problems of large increase in energy consumption of light removal tower, pollution of trays and packing, etc., and reduce maintenance workload Effect

Pending Publication Date: 2019-01-18
江阴市大洋固废处置利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simply increasing the reflux ratio of the light removal tower helps to improve the water content of the product, but the energy consumption of the light removal tower increases greatly
In addition, the raw material liquid with high gum content is fed to the reboiler at the bottom of the rectification column, and the rising gas phase is easy to entrain rubber particles and carbon powder particles, polluting the tray and packing

Method used

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  • N-methylpyrrolidone decompression and purification system and purification method

Examples

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Effect test

Embodiment 1

[0027] like figure 1 As shown, the N-methylpyrrolidone decompression purification system of Example 1 is a closed system comprising a feed tank 1, light removal unit 2 and finished product unit 3 connected in sequence;

[0028] The dehydrogenation unit 2 includes a light removal tower 21 and a first reboiler 22 arranged at the bottom of the light removal tower 21, the gas phase feed port of the light removal tower 21 is connected with the gas phase outlet of the feed tank 1, and the light removal tower 21 feeds The top of the mouth is provided with the semi-finished product outlet of the rectification section and the tower top condenser 23, the semi-finished product discharge port communicates with the semi-finished product condenser 24, the liquid outlet of the semi-finished product condenser 24 communicates with the receiving tank 25, and the tower top condenser 23 The distributor below communicates with the light component receiving tank 26;

[0029] Finishing unit 3 compr...

Embodiment 2

[0032] Embodiment 2, the purification system communicates with the nitrogen gas source 5 .

[0033] Specifically, the nitrogen gas supplied by the nitrogen gas source is dry. It is respectively connected with the feed tank, light removal tower, receiving tank, finished product tower and light component receiving tank in the system through pipelines. As an equivalent alternative, dry air can also be used to displace the nitrogen in the system.

[0034] The N-methylpyrrolidone decompression purification method of embodiment 1 comprises the following steps:

[0035] S1: Replace the air in the purification system with nitrogen, start the vacuum pump and maintain the vacuum of the purification system;

[0036] S2: Feeding, heating the raw materials in the feeding tank, and feeding the raw materials through the side line gas phase of the light removal tower after gasification;

[0037]S3: light removal, the first reboiler at the bottom of the light removal tower heats the materia...

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Abstract

The invention discloses an N-methylpyrrolidone decompression and purification system. The N-methylpyrrolidone decompression and purification system is a sealed system comprising a feeding tank, a light component removal unit and a finished product unit, which are connected in sequence, wherein a light component removal tower in the light component removal unit is connected with a gas-phase outletof the feeding tank; the light component removal tower is provided with a semi-finished product discharging opening of a rectification section and a tower top condenser; the semi-finished product discharging opening is communicated with a material receiving tank through a semi-finished product condenser; a distributor at the lower side of the tower top condenser is communicated with a light component receiving tank; a feeding opening of a second re-boiler in the finished product unit is communicated with the material receiving tank and a bottom liquid outlet of a first re-boiler; a gas-phase outlet of the second re-boiler is communicated with a side wall gas-phase feeding opening of a finished product tower; a top gas-phase outlet of the finished product tower is communicated with a finished product tank through a finished product condenser; and the finished product tower, the second re-boiler and a bottom liquid-phase outlet of the finished product tower are communicated with a wastesolution receiving tank. The purification system disclosed by the invention is small in maintenance working amount and high in target product recovery ratio. The invention further provides a purification method based on the N-methylpyrrolidone decompression and purification system.

Description

technical field [0001] The invention relates to the technical field of chemical purification, in particular to an N-methylpyrrolidone decompression purification system and purification method. Background technique [0002] N-Methylpyrrolidone (NMP), a colorless transparent oily liquid with a slight amine odor. Low volatility, good thermal stability and chemical stability, can volatilize with water vapor, hygroscopic, sensitive to light. It is easily soluble in water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, and can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds. In the lithium battery industry, NMP is mainly used to dissolve the positive electrode binder PVDF and dilute the slurry. In addition, the exhaust gas from the drying process of the lithium-ion battery production process contains NMP, which is usually absorbed by activated carbon, or sprayed into atomized co-coagulation Coagulant condensati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267
CPCC07D207/267Y02P20/10
Inventor 徐锦石徐啸
Owner 江阴市大洋固废处置利用有限公司
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