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

A technology for methylpyrrolidone and p-dichlorobenzene is applied in the field of ultra-high-purity separation and purification of wastewater containing N-methylpyrrolidone and p-dichlorobenzene, and can solve problems such as waste of resources, environmental pollution, increased production costs, and the like, achieve the effect of reducing energy consumption

Active Publication Date: 2017-03-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this kind of industrial wastewater containing NMP and p-dichlorobenzene is discharged directly, it will not only seriously pollute the environment, but also cause waste of resources and increase production costs.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Recycling of 20t / h wastewater containing NMP and p-dichlorobenzene

[0018] The operation steps of the ultra-high-purity separation and purification process for wastewater containing NMP and p-dichlorobenzene are as attached Figure 1 shown. The system is mainly composed of rectification tower, reflux tank, heat exchanger, phase separation tank, vacuum system and other equipment. There are metering, control instruments and pipelines between each equipment.

[0019] Wastewater containing 51% water, 45% NMP, and 4% p-dichlorobenzene passes through pump P-1, is preheated to 50°C by heat exchanger E-1, and then enters the first rectification tower T-1. The number of theoretical plates is 40, the diameter of the column is 1.6 meters, and the regular metal plate corrugated packing is used, the material is 316L, the operating pressure is 0.65atm, the reflux ratio is 0.5, and the liquid temperature at the bottom of the first distillation column T-1 is 190°C. 1.5MP...

Embodiment 2

[0023] Example 2: Recycling of 15t / h wastewater containing NMP and p-dichlorobenzene

[0024] The mode of operation is as in Example 1.

[0025] The waste water containing 55% water, 43% NMP and 2% p-dichlorobenzene is transported to the heat exchanger E-1 through the pump P-1 and preheated to 80°C, and then enters the first rectification tower T-1 for separation. -1 column has a theoretical plate number of 60, uses structured wire mesh packing, material is 316L, column diameter is 2.6 meters, structured packing is used inside the column, operating pressure is 0.4atm, reflux ratio is 2.5, the first rectification column The temperature of the liquid at the bottom of T-1 is 165°C, and T-1 uses 1MPa water vapor as a heat source. After being separated by the first rectification tower T-1, the NMP purity of the T-1 tower kettle reaches 99.996wt%, and it can be extracted to the NMP finished product tank through the pipeline 4 for storage. , the temperature of the mixed steam of p-...

Embodiment 3

[0029] Example 3: Recycling of 35t / h waste water containing NMP and p-dichlorobenzene

[0030] The mode of operation is as in Example 1. The waste water containing 48% water, 49% NMP and 3% p-dichlorobenzene is transported to the heat exchanger E-1 by the pump P-1, preheated to 65°C, and then enters the first rectification tower T-1 for separation, T- 1 column has a theoretical plate number of 40, a column diameter of 1.4 meters, ceramic random packing, an operating pressure of 0.45 atm, a reflux ratio of 0.8, and a temperature of liquid at the bottom of the first distillation column T-1 of 175°C. MPa water vapor provides heat source. After being separated by the first rectification tower T-1, the NMP content of the T-1 tower kettle reaches 99.994wt%, and it can be extracted to the NMP finished product tank through the pipeline 4 for storage, at the top of the first rectification tower T-1 , the temperature of the mixed steam of p-dichlorobenzene and water is, then enter the...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267C07C17/383C07C25/08C02F1/04
CPCC02F1/04C07C17/383C07D207/267C07C25/08
Inventor 张志炳杨高东王宝荣巫先坤周政罗宋孟为民
Owner NANJING UNIV
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