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Process and system for treating nitrochlorobenzene ammonolysis wastewater

A wastewater treatment system, technology of nitrochloroaniline, applied in the field of nitrochloroaniline ammonolysis wastewater treatment process and system, can solve the problems of large consumption and achieve the effects of lightening the load, reducing the amount of wastewater, and reducing consumption

Inactive Publication Date: 2013-10-23
杜惠红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, before entering the electrolytic catalytic oxidation device, the wastewater must be weakly acidic, and the ammonium hydrolysis wastewater contains excess free ammonia, which forms a buffer system with ammonium chloride, so it takes a lot of acid to neutralize it into weak acidity

Method used

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  • Process and system for treating nitrochlorobenzene ammonolysis wastewater
  • Process and system for treating nitrochlorobenzene ammonolysis wastewater

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Embodiment 1

[0017] Embodiment 1 of the present invention: nitrochlorobenzene ammonolysis wastewater treatment process: add sodium hydroxide in the ammonium solution wastewater, make the ammonium ion wherein change into free ammonia, send into vacuum evaporator, waste water is heated to boiling, maintain The boiling time is 8 to 10 hours, so that the free ammonia escapes; the free ammonia in the steam is absorbed by water and returned to the batching process of nitrochloroaniline ammonolysis. The ammonia nitrogen index of the evaporated wastewater can be reduced to 100ppm. After entering the electrolytic catalytic oxidation sewage treatment device to degrade organic substances such as nitrochlorobenzene and nitroaniline, it then enters the ammonium chloride recovery device to recover the remaining ammonium chloride, and then it can be discharged. This process can increase the recovery ratio of ammonia.

[0018] The nitrochloroaniline ammonium solution wastewater treatment system used in th...

Embodiment 2

[0019] Embodiment 2 of the present invention: nitrochlorobenzene ammonolysis wastewater treatment process: add calcium oxide or calcium hydroxide in the ammonium solution wastewater, make the ammonium ion wherein change into free ammonia, send into vacuum evaporator, waste water is heated to Boiling, maintaining the boiling time for 6-8 hours, so that the free ammonia escapes; the free ammonia in the steam is absorbed by water and returned to the batching process of nitrochlorophenyl ammonolysis. After evaporation, the ammonia nitrogen index of wastewater can be reduced to 400ppm. After entering the electrolytic catalytic oxidation sewage treatment device to degrade organic substances such as nitrochlorobenzene and nitroaniline, it then enters the ammonium chloride recovery device to recover the remaining ammonium chloride, and then it can be discharged. This process can increase the recovery ratio of ammonia.

[0020] The nitrochlorobenzene ammonolysis waste water treatment s...

Embodiment 3

[0021] Embodiment 3 of the present invention: Nitrochlorobenzene ammonolysis wastewater treatment process: send the ammonium solution wastewater to ammonia distillation equipment, heat the wastewater to boiling, and maintain the boiling time for 4 to 5 hours to escape the free ammonia in the steam; The free ammonia is absorbed by water and returned to the batching process of nitrochloroaniline ammonolysis for use. After evaporation, the ammonia nitrogen index of wastewater can be reduced to 800ppm. After entering the electrolytic catalytic oxidation sewage treatment device to degrade organic substances such as nitrochlorobenzene and nitroaniline, it then enters the ammonium chloride recovery device to recover ammonium chloride, and then it can be discharged. This process can increase the recovery ratio of ammonium chloride.

[0022] In actual production, the recovery ratio of ammonia and ammonium chloride can be randomly adjusted according to the market prices of liquid ammoni...

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Abstract

The invention discloses a process and system for treating nitrochlorobenzene ammonolysis wastewater. According to the process, ammonolysis wastewater is evaporated by using ammonia distilling equipment so as to liberate free ammonia; or an alkaline substance is added firstly so as to convert ammonium ions in the ammonolysis wastewater into the free ammonia, and then, evaporation is carried out; the free ammonia in vapor is absorbed by water and then returns to a material proportioning process of nitrochlorobenzene ammonolysis; and the evaporated wastewater enters an electrolysis and catalytic oxidation sewage treatment device for degradation, enters an ammonium chloride recovery device for ammonium chloride recovery and then can be discharged. Compared with the prior art, the process and the system have the advantages that the free ammonia is recovered and utilized in a cycling manner, so that the consumption of ammonia is reduced; after the free ammonia is recovered, the consumption of neutralizing acid is reduced, the volume of the wastewater is reduced, and the load of the sewage treatment device is reduced; and by adopting the process and the system, the recovery ratio of ammonia and ammonium chloride can be adjusted randomly according to the market price of liquid ammonia and ammonium chloride.

Description

technical field [0001] The invention relates to a process and system for treating waste water by ammonolysis of nitrochlorophenyl, belonging to the technical field of waste water treatment. Background technique [0002] In the ammonolysis of nitrochloroaniline, due to the use of excess ammonia, ammonium chloride is generated after the reaction. Therefore, after centrifugation and washing, the wastewater contains relatively high concentrations of free ammonia and ammonium chloride, as well as a small amount of nitrochlorobenzene and nitroaniline. At present, the treatment method of ammonium nitrochlorobenzene wastewater is as follows: firstly use electrolytic catalytic oxidation sewage treatment device to degrade organic matter such as nitrochlorobenzene and nitroaniline; then use ammonium chloride recovery device to recover ammonium chloride. After being treated by this method, the ammonia nitrogen in the wastewater can reach the discharge standard. But before entering the...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/16C01C1/02C02F1/04C02F1/461C02F101/16
CPCY02P20/584
Inventor 杜惠红
Owner 杜惠红
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