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Method for treating nitrochlorobenzene production wastewater

A technology for the production of nitrochlorobenzene and waste water, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem that nitrochlorobenzene is difficult to meet the discharge standards and lacks complete and effective means, non-standard discharge and other problems, to achieve stable and reliable treatment effects, easy industrial amplification, and small footprint

Active Publication Date: 2012-04-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method proposed in this patent does have obvious effects on the separation of nitrochlorobenzene in wastewater, there are still some problems in this method: first, after the extraction operation, the content of nitrochlorobenzene in wastewater is difficult to reach the discharge standards; secondly, the patent only focused on changes in the content of nitrochlorobenzene in wastewater, and did not consider other indicators (such as chromaticity, COD, etc.) How to deal with carbon tetrachloride of benzene is still a difficult problem
Although the patent can effectively separate nitrochlorobenzene from nitrochlorobenzene production wastewater, nitrophenols still exist in the wastewater and cannot be discharged up to the standard
[0005] To sum up, at present, there is still a lack of complete and effective means to achieve the discharge of nitrochlorobenzene production wastewater up to the standard

Method used

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  • Method for treating nitrochlorobenzene production wastewater
  • Method for treating nitrochlorobenzene production wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The pH value of nitrochlorobenzene production wastewater in a company is 12.0, the salt content is 2.7%, the content of nitrochlorobenzene is 1180mg / L, and the chroma is 5000 times.

[0025]The temperature in the bottom of the stripper is controlled at 115°C, the pressure (gauge pressure) at the top of the stripper is controlled at 0.05MPa, the number of theoretical plates of the stripper is 25, and the outflow of the top of the stripper is 20% of the water entering the tower Under certain conditions, the content of nitrochlorobenzene in the effluent of the stripping tower can be reduced to within 30 mg / L.

[0026] Next, carry out catalytic oxidation treatment to waste water (including the effluent from the bottom of the stripping tower and the circulating backwater containing iron deposits, wherein the amount of circulating backwater containing iron deposits is 45% of the effluent from the bottom of the stripping tower) , the temperature control of the catalytic oxidat...

Embodiment 2

[0031] The pH value of nitrochlorobenzene production wastewater from a company is 13.0, the salt content is 2.3%, the content of nitrochlorobenzene is 780mg / L, and the chroma is 4200 times.

[0032] Under the conditions that the temperature of the stripper tower kettle is controlled at 105°C, the stripper tower top pressure is controlled at normal pressure, the stripper theoretical plate number is 15, and the stripper tower top outflow is 10% of the water entering the tower, The content of nitrochlorobenzene in the effluent of the stripping tower can be reduced to less than 50mg / L.

[0033] Next, catalytic oxidation treatment is carried out to waste water (comprising the effluent from the bottom of the stripping tower and the circulating backwater containing iron deposits, wherein the amount of circulating backwater containing iron deposits is 15% of the effluent from the bottom of the stripping tower) , the temperature control of the catalytic oxidation reaction system is 85 ...

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Abstract

The invention provides a method for treating nitrochlorobenzene production wastewater, comprising the following steps of: 1, heating wastewater by indirect heat exchange between the wastewater and the effluent water of a precipitation separator, the bottom effluent water of a stripping tower and the overhead vapor of the stripping tower in sequence, then enabling the wastewater to enter the stripping tower for carrying out stripping treatment, and directly recycling the overhead vapor rich in nitrochlorobenzene of the stripping tower for the production process after cooling by indirect heat exchange; 2, regulating the pH of the bottom effluent water of the stripping tower cooled by indirect heat exchange with the nitrochlorobenzene production wastewater to be acidic and carrying out catalytic oxidation treatment; 3, regulating the pH of the effluent water treated by catalytic oxidation to be neutral to carry out precipitation reaction on dissolved iron and decomposition reaction on residual H2O2 in water; and 4, carrying out gravity sedimentation separation on reaction effluent, recycling all the separated iron precipitant, and discharging the separated water reaching the standards after cooling by indirect heat exchange with the nitrochlorobenzene production wastewater. The method provided by the invention can effectively reduce the chroma, COD(Chemical Oxygen Demand) and nitrochlorobenzene content of the wastewater and realizes discharge of wastewater reaching the standards.

Description

technical field [0001] The invention relates to a treatment method for organic chemical wastewater, in particular to a treatment method for refractory organic chemical wastewater, in particular to a method for treating nitrochlorobenzene production wastewater. Background technique [0002] Nitrochlorobenzene is an intermediate of many fine chemical products such as medicine, pesticide and dye. The production of nitrochlorobenzene is based on chlorobenzene, and the mixed acid of nitric acid and sulfuric acid is used as the nitrating agent for nitration. The crude product obtained by nitration needs to be washed with alkali and water, and then separated and purified by a rectification tower to obtain p-nitrochlorobenzene. Chlorobenzene and o-nitrochlorobenzene. Using the above production process, the production of each ton of nitrochlorobenzene products will produce 1.2 to 1.8 tons of waste water, which mainly contains nitrochlorobenzene, nitrochlorophenol and other pollutant...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/72
Inventor 李正琪程学文莫馗万国晖卢姝高凤霞张宾
Owner CHINA PETROLEUM & CHEM CORP
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