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Process for treating waste water in chlorfluazuron synthesis

A technology for wastewater treatment and profenofos, which is applied in the direction of reducing water/sewage treatment, chemical instruments and methods, bromine/hydrogen bromide, etc. Good social and economic benefits

Inactive Publication Date: 2008-10-01
王永昌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of the last 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 relatively Unpleasant smell, if not treated, will cause great pollution to the environment, if treated according to conventional methods without recycling useful resources, it will cause a great waste of resources

Method used

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  • Process for treating waste water in chlorfluazuron synthesis
  • Process for treating waste water in chlorfluazuron synthesis

Examples

Experimental program
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Effect test

Embodiment 1

[0014]

[0015] 3Na 2 CO 3 +3Br 2 →5NaBr+NaBrO 3 +3CO 2 ↑

[0016] 5NaBr+NaBrO 3 +3H 2 SO 4 →3Br 2 +3Na 2 SO 4 +3H 2 o

[0017] Introduce quantitative chlorine gas into the waste water to prepare bromine, and then extract trimethylethylammonium chloride from the water after separating bromine, and the chemical reaction equation is as above.

[0018] Add 2500kg of waste water into a 3000L glass-lined reactor, stir at room temperature, feed chlorine gas at a flow rate of 60kg / h, the weight of chlorine gas is 156kg, and continue to react for 0.5h after the chlorine feeding is completed.

[0019] Add 800kg of 30% sodium carbonate solution to the 1000L glass-lined bromine absorption reaction kettle and start stirring, add 800kg of 30% sodium carbonate solution to the tail gas absorption tank; the waste water after chlorine flow is blown by air with a flow rate of 50L / min Bubble, and heat up at the same time until the temperature reaches 105°C, keep bubbling at this ...

Embodiment 2

[0024]

[0025] The bromine is prepared by feeding quantitative chlorine gas into the waste water, the chemical reaction equation is as above, and then trimethylethylammonium chloride is extracted from the water separated from the bromine.

[0026] Add 2500kg of waste water into a 3000L glass-lined reactor, stir at room temperature, feed chlorine gas at a flow rate of 60kg / h, the weight of chlorine gas is 156kg, and continue to react for 0.5h after the chlorine feeding is completed.

[0027] Cooling water is passed into the glass condenser, and steam is passed into the jacket of the 3000L glass-lined reactor. Bromine enters the condenser along with the water vapor, and flows into the water separation receiver after condensation. The bromine sinks to the bottom of the receiver. , the condensed water is returned in the still, until the water in the still turns yellow and the condensed water that evaporates also becomes substantially colorless, the bromine in the water separati...

Embodiment 3

[0030] The waste water flows into the upper port of the oxidation tower at a flow rate of 300L / h from the high level tank, and the chlorine gas flows in from the lower part of the oxidation tower at a flow rate of 350L / h (0.2MPa). The tower 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, and the separated and settled crude bromine enters the rectification tower from the bottom of the bromine water separation bottle. , the saturated bromine water returns to the distillation tower, and the crude bromine obtains refined bromine after secondary rectification, and the waste water discharged from the distillation tower enters the trimethyl ethyl ammonium chloride extraction device, and the trimethyl ethyl ammonium chloride extraction device is prepared according to the method of embodiment 1 and 2 Ethy...

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Abstract

The invention provides a method for treating profenofos synthetic wastewater. A certain amount of chlorine is led into the wastewater produced in the synthesis process of profenofos, bromide ion in the wastewater is replaced by bromine and trimethyl ethyl ammonium chloride is generated, the generated bromine is separated with the wastewater, and then the wastewater after the bromine is separated is used for preparing the trimethyl ethyl ammonium chloride. The method can be used for treating the waste water produced in the synthesis process of the profenofos to recover valuable resource, thereby having better social and economic benefits.

Description

Technical field: [0001] The invention relates to a method for treating waste water produced in the profenofos synthesis process. Background technique: [0002] The full name of profenofos is O-ethyl-S-propyl-O-(2-chloro-4-bromo)-phenylphosphorylthioate, which is a new type of pesticide developed by Ciba-Geigy in the late 1970s. Sexual pests showed high activity, especially against resistant cotton bollworm. its acute toxicity LD 50 It is 358mg / kg (orally in rats). Profenofos crude oil is yellowish brown 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. In 2005, the species was listed by the state as one of the varieties to replace highly toxic pesticides. 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. An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C01B7/09C07C211/63C07F9/18
Inventor 王永昌
Owner 王永昌
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