Ultra-high purity separating and refining technology of wastewater containing NMP (N-Methyl Pyrrolidone) and paradichlorobenzene

Abstract

The invention relates to an ultra-high purity separating and refining technology of wastewater containing NMP (N-Methyl Pyrrolidone) and paradichlorobenzene, and aims to provide a technical method for carrying out ultra-high purity recycling on all useful chemical components (including water) in industrial wastewater. The ultra-high purity separating and refining technology comprises the following step: respectively separating and recycling the wastewater containing NMP and paradichlorobenzene by adopting a decompression and rectification system which is of a three-tower serial-connection structure, thus obtaining a product of which the purity is higher than 99.99 wt percent and which contains NMP, water and paradichlorobenzene. The recycling rate of the whole process is up to 99.99 percent or above.

Description

technical field

[0001] The invention relates to an ultra-high-purity separation and purification process for wastewater containing N-methylpyrrolidone and p-dichlorobenzene. Background technique

[0002] N-methylpyrrolidone (hereinafter referred to as NMP) is a solvent with high flash point, low corrosion, high solubility, low viscosity, low volatility, excellent thermal stability and chemical stability. It is used in lithium batteries, medicine, It is widely used in pesticides, pigments, cleaning agents, insulating materials, high temperature resistant materials and other industries.

[0003] P-dichlorobenzene is an important raw material for organic synthesis, used in the synthesis of dyes, high temperature resistant materials and pesticide intermediates. It can also be used as fumigant insecticide, fabric anti-moth agent, anti-mold agent, air deodorizer, mutagen, etc.

[0004] In the fields of medicine, pesticides, and high-temperature-resistant materials, these two che...

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