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A treatment method for nitrogen-containing heterocyclic organic waste water in imidacloprid production

A treatment method and technology for nitrogen heterocyclic compounds are applied in the field of treatment of nitrogen-containing heterocyclic organic waste water in the production of imidacloprid, which can solve the problems of environmental pollution, low resource utilization rate, failure to be recycled and the like, and reduce energy consumption. Effect

Active Publication Date: 2022-06-28
NANJING TECH UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Distillation is usually used for treatment, imidacloprid wastewater cannot be effectively treated, butanone and other substances have not been recycled, the resource utilization rate is not high, and environmental pollution has also occurred

Method used

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  • A treatment method for nitrogen-containing heterocyclic organic waste water in imidacloprid production
  • A treatment method for nitrogen-containing heterocyclic organic waste water in imidacloprid production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The TOC of nitrogen-containing heterocyclic organic wastewater in the production of imidacloprid was 30,000 mgC / L, the mass percentage of butanone was 1.31%, the mass fraction of nitrogen-containing hetero compounds was 3.75%, and the salt (potassium carbonate, potassium chloride) content was 23.13%, The rest is water, and the pH of the wastewater is 14.

[0039] Concentrated hydrochloric acid was used to adjust the pH of nitrogen-containing heterocyclic organic waste water to 1. After acidification, the waste water was passed into the rectification tower at 300 L / h (the top temperature of the rectification tower was 75°C, the temperature of the tower reactor was 110°C, and the number of plates was 10) Carry out atmospheric rectification, extract butanone after phase separation at the top of the tower, the butanone recovery rate is 99.83%, and the content of butanone in the acid waste liquid extracted from the tower still is 0.7 mg / L. The acid waste liquid is distilled ...

Embodiment 2

[0041]The TOC of nitrogen-containing heterocyclic organic waste water in the production of imidacloprid was 29800 mgC / L, the mass percentage of butanone was 1.16%, the mass fraction of nitrogen-containing hetero compounds was 3.73%, and the salt (potassium carbonate, potassium chloride) content was 25.9%, The rest is water, and the pH of the wastewater is 14.

[0042] Concentrated hydrochloric acid was used to adjust the pH of the nitrogen-containing heterocyclic organic waste water to 1. After acidification, the waste water was passed into the rectification tower at 300 L / h (the top temperature of the rectification tower was 75 °C, the temperature of the tower reactor was 110 °C, and the number of plates was 300 L / h). 10) carry out atmospheric rectification, extract butanone after phase separation at the top of the tower, the butanone recovery rate is 99.92%, and the content of butanone in the acid waste liquid extracted from the tower still is 0.5 mg / L. The acid waste liquid...

Embodiment 3

[0044] The TOC of nitrogen-containing heterocyclic organic waste water in the production of imidacloprid was 27000 mgC / L, the mass percentage of butanone was 1.91%, the mass fraction of nitrogen-containing hetero compounds was 3.38%, and the salt (potassium carbonate, potassium chloride) content was 26.4%, The rest are water wastewater with a pH of 14.

[0045] Concentrated hydrochloric acid was used to adjust the pH of the nitrogen-containing heterocyclic organic waste water to 1. After acidification, the waste water was passed into the rectification tower at 300 L / h (the top temperature of the rectification tower was 75 °C, the temperature of the tower reactor was 110 °C, and the number of plates was 300 L / h). 10) Carry out atmospheric rectification, extract butanone after phase separation at the top of the tower, the butanone recovery rate is 99.23%, and the content of butanone in the acid waste liquid extracted from the tower still is 0.6 mg / L. The acid waste liquid is dis...

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Abstract

The invention discloses a method for treating nitrogen-containing heterocyclic organic waste water in the production of imidacloprid. Firstly, the nitrogen-containing heterocyclic compound in the waste water is converted into hydrochloride by acidification treatment, and then the oil-water mixture is obtained by rectification at the top of the rectification tower. phase, butanone is mined, and acidic waste liquid is obtained in the rectification tower; the acidic waste liquid is evaporated, and the distilled liquid is adsorbed with an adsorbent to reduce the TOC of the distilled liquid to below 80mgC / L, and the adsorbent is Vacuum thermal regeneration; the distillation residue is subjected to dry oxygen cracking treatment under the action of a catalyst, and the potassium chloride aqueous solution and the catalyst are separated by washing with water, and the potassium chloride aqueous solution is removed by MVR to obtain potassium chloride industrial salt. Water recycling is used for salt and catalyst separation. The invention realizes resource utilization and purification treatment of nitrogen-containing heterocyclic waste water in imidacloprid production, and finally obtains potassium chloride by-product salt with TOC content lower than 10 mg / kg.

Description

technical field [0001] The invention belongs to the field of industrial nitrogen-containing heterocyclic wastewater treatment, and relates to a method for treating nitrogen-containing heterocyclic organic wastewater in imidacloprid production. Background technique [0002] Nitrogen-containing heterocyclic organic compounds (NHCs) are the main toxic and harmful organic compounds in the wastewater discharged from pesticide plants, coking plants and other factories. Nitrogen-containing heterocyclic organic compounds have certain damage to the nervous system, kidneys and other organs of the human body, and have "three causes" harm to humans and animals. The structure of some nitrogen-containing heterocyclic compounds is relatively stable, difficult to degrade in nature, easy to be enriched in nature, and has a sustainable impact on the environment. [0003] Imidacloprid is a new type of nitromethylene systemic insecticide, which has a relatively broad market potential in the cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10B01D53/86B01D53/44C02F101/12C02F101/34C02F101/38
CPCC02F9/00B01D53/8687C02F1/66C02F1/04C02F1/283C02F2101/38C02F2101/34C02F2303/16B01D2257/708C02F2101/12
Inventor 乔旭陈献王金军熊金华徐飞崔咪芬齐敏周哲刘清
Owner NANJING TECH UNIV
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