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Method for treating profenofos synthetic wastewater by using hydrogen peroxide

A technology of hydrogen peroxide and profenofos, which is applied in the field of using hydrogen peroxide to treat profenofos synthetic wastewater, can solve problems such as high chemical oxygen consumption, unpleasant odor, environmental pollution, etc., and achieves simple overall process, high reliability, and operating costs. low effect

Inactive Publication Date: 2009-09-09
吴秀玲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production process of the final step of profenofos synthesis, every ton of 90% profenofos will produce 540-2700kg of waste water, containing about 405kg of trimethylethylammonium bromide, high chemical oxygen consumption and harmful If the bad smell is not treated, it will cause serious pollution to the environment. If it is treated according to conventional methods without recycling useful resources, it will cause a great waste of resources

Method used

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  • Method for treating profenofos synthetic wastewater by using hydrogen peroxide

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Effect test

Embodiment 1

[0022] Embodiment one: intermittent production bromine

[0023] Add 640kg of 30% sodium carbonate solution to the 1000L glass-lined bromine absorption reactor and start stirring, add 640kg of 30% sodium carbonate solution to the tail gas absorption tank, add 2000kg of waste water to the 3000L glass-lined reactor, and add 265kg of 92.5% to the reactor Concentrated sulfuric acid and 300kg of 27.5% hydrogen peroxide to make it react, the reaction time is 3.0h, heated to 105±5°C and blowing air, the vertical condenser is fed with cooling water, continue to maintain the distillation temperature until there is basically no bromine in the air 1. Until the wastewater turns light yellow, cool down to 50±5°C, neutralize it with 30% sodium hydroxide, add 20kg sodium thiosulfate, and discharge it to the wastewater treatment pool.

[0024] Pass cooling water into the jacket of the 1000L glass-lined bromine absorption reaction kettle, slowly drop 92.5% sulfuric acid from the elevated tank, ...

Embodiment 2

[0026] Embodiment two: continuous production of bromine

[0027] The waste water flows into the upper port of the oxidation tower 1 at a flow rate of 300L / h from the high level tank, and the hydrogen peroxide flows in from the upper port of the oxidation tower 1 at a flow rate of 250L / h. Tower 2 is blown out by the water vapor from the lower part of the distillation tower, and enters the condenser together with a part of the water vapor. After condensation, it becomes a liquid and enters the bromine-water separation bottle 4, and the separated and settled crude bromine enters a bromine-water separation bottle from the bottom of the bromine-water separation bottle. Stage rectification tower 5, saturated bromine water returns to distillation tower 2, enters secondary rectification tower after the bromine of primary rectification is condensed, obtains refined bromine after rectification again, and the waste water discharged from distillation tower is neutralized to neutral.

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Abstract

The invention relates to a method for treating profenofos synthetic wastewater by using hydrogen peroxide, which comprises the following steps: after a proper amount of sulphuric acid is added to the wastewater to regulate the acidity of the wastewater, the hydrogen peroxide is added to the wastewater for heating reaction, bromide ions are oxidized into bromine, other organic matters are oxidized, the bromine is separated from the wastewater, and the wastewater from which the bromine is separated is neutralized; the temperature of oxidation reaction is 0 to 105 DEG C, sulphuric acid, hydrochloric acid, nitric acid, phosphoric acid or a mixture of the same can be added to the wastewater, the proper amount of acid is added for regulating the acidity of the wastewater until the concentration of hydrogen ions is 0.01 to 10.0 mol / L, the concentration of the hydrogen peroxide is 7 to 50 percent, the mol ratio of the hydrogen peroxide to the bromine in the wastewater is from 1:0.5-1:4, the hydrogen peroxide is added to the wastewater for reaction of 0.5 to 5.0 h, the wastewater introduced by a connecting pipe of a wastewater overhead tank and the hydrogen peroxide introduced by a connecting pipe of a hydrogen peroxide overhead tank are collected into an oxidation tower to for oxidation reaction, the upper end of a distillating tower is connected with a condensator by a pipeline, and a fine bromine output pipe is arranged after the condensation of the product of the oxidation reaction through a primary rectifying tower and a secondary rectifying tower. The invention has simple integral technology, good stability, high reliability and low operating cost.

Description

Technical field: [0001] The invention relates to a method for treating waste water, in particular to a method for treating profenofos synthetic waste water with hydrogen peroxide. Background technique: [0002] Profenofos is a new type of pesticide developed by Ciba-Geigy in the late 1970s. It has high activity against resistant pests, especially against cotton bollworm. its acute toxicity LD 50 Oral administration of 358mg / kg for rats. Profenofos crude oil is yellow liquid, pure product is colorless transparent liquid, boiling point 110℃ / 0.001mmHg, n D 25 1.5511, the solubility in water at 20°C is 20ppm, soluble in most organic solvents. This variety was listed by the state as one of the varieties to replace highly toxic pesticides in 2005. It is one of the most promising pesticide varieties. Its export and domestic trade markets have considerable potential. At present, there are more than ten domestic enterprises in production , and the output has increased by a large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/72C02F1/04C01B7/09C02F103/36
Inventor 吴秀玲
Owner 吴秀玲
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