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Pre-treatment technology of 3-chloro-2-hydrazinopyridine production waste water

A technology of hydrazinopyridine and production wastewater, which is applied in the field of pretreatment technology of classified collection and quality separation treatment, can solve the problems of large dilution ratio of biochemical influent water, difficult to discharge standard treatment, harsh reaction conditions, etc., and achieves low cost and operation. Simple, targeted results

Inactive Publication Date: 2013-08-21
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of the existing pyridine organic matter production wastewater pretreatment technology, such as high investment, harsh reaction conditions, large dilution ratio of biochemical influent, and difficult to meet the standard discharge, and provide a kind of effective, high efficiency and low investment. Less pretreatment method, i.e. a pretreatment process for 3-chloro-2-hydrazinopyridine production wastewater

Method used

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  • Pre-treatment technology of 3-chloro-2-hydrazinopyridine production waste water

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Embodiment 1

[0031] (1) Divide 3-chloro-2-hydrazinopyridine production wastewater into three categories for collection according to water quality, namely high-salt and high-concentration wastewater, low-salt and high-concentration wastewater, and low-concentration wastewater. Add hydrochloric acid dropwise to high-salt and high-concentration wastewater to bring the pH value to 8, add 10% (mass fraction) polyferric sulfate solution 10mL / L and stir, then add 2‰ (mass fraction) anionic polyacrylamide solution 5mL / L Afterwards, stir quickly and then slowly, and obtain the supernatant after standing still.

[0032] (2) Take the supernatant liquid obtained in (1), adjust the pH value to 5 with hydrochloric acid, and increase the vacuum pump pressure to 0.06 MPa, perform decompression evaporation and desalination, and obtain a distillate. Through the treatment of coagulation sedimentation-vacuum evaporation desalination process, the salt content of high-salt and high-concentration wastewater was ...

Embodiment 2

[0040](1) Divide 3-chloro-2-hydrazinopyridine production wastewater into three categories for collection according to water quality, namely high-salt and high-concentration wastewater, low-salt and high-concentration wastewater, and low-concentration wastewater. Add sulfuric acid dropwise to high-salt and high-concentration wastewater to bring the pH to 9, add 5% (mass fraction) polyaluminum chloride solution 5mL / L and stir, then add 1‰ (mass fraction) anionic polyacrylamide solution 2.5mL After / L, stir rapidly and then slowly, and obtain the supernatant after standing still.

[0041] (2) Take the supernatant liquid obtained in (1), adjust the pH value to 6 with sulfuric acid, and increase the vacuum pump pressure to 0.03 MPa, carry out desalination by decompression evaporation, and obtain distillate. Through the treatment of coagulation sedimentation-vacuum evaporation desalination process, the salt content of high-salt and high-concentration wastewater was reduced from 211g...

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Abstract

The invention relates to a pre-treatment technology of 3-chloro-2-hydrazinopyridine production waste water. The pre-treatment technique is characterized by comprising the steps of separating and collecting 3-chloro-2-hydrazinopyridine production waste water, and carrying out separation treatment aiming at the water quality characteristics of all types of waste water. According to the pre-treatment technology of 3-chloro-2-hydrazinopyridine production waste water, the defects that an existing pyridine organic matter production waste water pretreatment technology is high in cost, the reaction conditions are harsh, biochemical inflowing water dilution ratio is large, the treatment is difficult to achieve the standard, and the like can be overcome, the separation collection and separation treatment to the 3-chloro-2-hydrazinopyridine production waste water can be realized, the pretreatment technology is strong in pertinence, strong in practicability, remarkable in effect, lower in cost, and convenient to operate, the biological toxicity of the waste water can be greatly reduced, and the biodegradability of the waste water can be enhanced.

Description

technical field [0001] The invention relates to a pretreatment process for wastewater produced by 3-chloro-2-hydrazinopyridine, in particular to a pretreatment process for classified collection and qualitative treatment aimed at the difference in wastewater quality. Background technique [0002] 3-Chloro-2-hydrazinopyridine is a key intermediate for the synthesis of the new insecticide chlorantraniliprole. Its production process uses nicotinamide as raw material, followed by Hofmann degradation reaction, chlorination reaction and diazotization reaction and hydrazine reaction to finally obtain 3-chloro-2-hydrazinopyridine. Since the synthesis of 3-chloro-2-hydrazinopyridine requires multi-step reactions, multiple streams of production wastewater with huge differences in water quality and several pyridine intermediates are produced. [0003] Pyridine organic compounds are a typical class of refractory nitrogen-containing heterocyclic compounds. There are many types, but they ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F9/06C02F103/36
Inventor 徐炎华陆雪梅徐之寅刘志英
Owner NANJING UNIV OF TECH
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