Recycling and purifying method of pyridine waste liquid

A purification method, pyridine technology, which is applied in the field of recovery and purification of pyridine waste liquid, can solve the problems of waste of resources, environment, pollution, etc., and achieve the effects of saving resources, good quality, and simple production process

Inactive Publication Date: 2021-10-08
四川熔增环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of waste of resources and environmental pollution caused by the inability to purify and utilize pyridine waste solvent in the prior art, and propose a recovery and purification method for pyridine waste liquid

Method used

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  • Recycling and purifying method of pyridine waste liquid
  • Recycling and purifying method of pyridine waste liquid
  • Recycling and purifying method of pyridine waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Get the agrochemical waste containing 55% sulfonate, sodium chloride and pyridine, pass it into the pressure swing rectification tower with a certain flow rate, rectify the waste material under a certain temperature and pressure, and enter the waste solvent of the pressure swing rectification tower The flow rate is 0.5m3 / h; the pressure of pressure swing rectification is 0.2MPa, the bottom temperature of the rectification tank is 100°C, the temperature of the liquid in the tank is 97°C, and the temperature at the top of the tank is 96°C. The reflux ratio is controlled at 15:1. The entire process needs to be controlled The system pressure remains constant, and the entire purification process is maintained as a continuous process.

[0035] The top component of the above-mentioned rectification separation is an organic composition azeotropic with water. This composition enters the pervaporation membrane device in the form of steam at a certain flow rate and pressure for deh...

Embodiment 2

[0039] Take the agrochemical wastes containing 60% sulfonate, sodium chloride and pyridine, pass them into the pressure swing rectification tower with a certain flow rate, rectify the waste materials at a certain temperature and pressure, and enter the waste solvent of the pressure swing rectification tower The flow rate is 0.6m3 / h; the pressure of the pressure swing rectification is 0.5MPa, the bottom temperature of the rectification tank is 121°C, the temperature of the liquid in the tank is 118°C, and the temperature at the top of the tank is 117°C. The reflux ratio is controlled at 20:1. The whole process needs to control the rectification The system pressure remains constant, and the entire purification process is maintained as a continuous process.

[0040]The top component of the above-mentioned rectification separation is an organic composition azeotropic with water. This composition enters the pervaporation membrane device in the form of steam at a certain flow rate an...

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Abstract

The invention discloses a recycling and purifying method of pyridine waste liquid. The method comprises the following steps: taking agrochemical waste containing sulfonate, sodium chloride and pyridine, introducing the agrochemical waste into a variable-pressure rectifying tower at a certain flow rate, and rectifying the waste at a certain temperature and a certain pressure. According to the recycling and purifying method of a waste pyridine solvent, through a series of low-energy-consumption procedures including pressure-swing distillation, pervaporation membrane coupled distillation dehydration, azeotropic solvent recycling, product side-drawing and drying of a tower-bottom material with a rake dryer, waste pyridine with a purity being only 50%-70% (wt) is purified into industrial-grade pyridine with a purity being larger than or equal to 99.9% (wt), the recycling of the waste pyridine solvent is realized, the pollution degree of the waste solvent to the environment in the agrochemical industry and in novel pesticide and novel polypeptide production is reduced, and production cost is saved. The method provided by the invention also has the advantages of high yield, low energy consumption, good quality, recyclability, simple and convenient production process, stable operation, suitability for industrial production and the like.

Description

technical field [0001] The invention relates to the technical field of waste solvent purification, in particular to a method for recovering and purifying pyridine waste liquid. Background technique [0002] With the development of organic synthesis technology and pesticide active molecule design skills and the demand for new pesticides in agricultural production, a variety of pyridine-containing pesticides came out after the 1960s. Daohua Company developed triclopyr, and Shiyuan Company developed fluazifop-ethyl and so on. German Bayer company and Japanese special pesticide company jointly developed imidacloprid and so on. Today, pyridine pesticides have been developed into many varieties including fungicides, insecticides and acaricides, herbicides and plant growth regulators. [0003] In the production of pesticides, a large amount of waste pyridine solvents containing impurities such as organic matter, water and salts are produced. Due to the high difficulty of purifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/16B01D61/36B01D53/22B01D53/26
CPCC07D213/16B01D61/362B01D61/366B01D53/268
Inventor 范文林鲁加峰黄啟虓纪王洋
Owner 四川熔增环保科技有限公司
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