Method and device used for processing nitrochlorobenzene production wastewater

A technology for the production of nitrochlorobenzene and waste water, which is applied in natural water treatment, chemical instruments and methods, heating water/sewage treatment, etc., and can solve the problem that nitrochlorobenzene is difficult to meet discharge standards, adsorption resin regeneration is difficult, tetrachlorination Carbon problems and other issues, to achieve stable treatment effect, easy industrial scale-up, and small footprint

Inactive Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Although the method proposed by this patent has obvious effect on the separation of nitrochlorobenzene in waste water, the method still has the following problems: first, after the extraction operation, the content of nitrochlorobenzene in the waste water is difficult to reach discharge Standard requirements; secondly, this method only pays attention to the change of nitrochlorobenzene content in wastewater, and

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  • Method and device used for processing nitrochlorobenzene production wastewater

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Embodiment 1

[0049] The pH value of nitrochlorobenzene production wastewater in a company is 12.0, the salt content is 2.7%, the content of nitrochlorobenzene is 1100mg / L, and the chroma is 5000 times.

[0050] When the operating temperature of the stripper is 115°C, the pressure (gauge pressure) at the top of the stripper is controlled at 0.05MPa, and the theoretical plate number of the stripper is 25, when the outflow of the top of the stripper is 20% of the water entering the tower Under these conditions, the content of nitrochlorobenzene in the effluent of the stripping tower can be reduced to below 30 mg / L.

[0051] Next, under the condition that the wastewater temperature is 40°C, the wastewater is subjected to photo-assisted Fenton catalytic oxidation treatment. Use 98% sulfuric acid to adjust the pH of the wastewater to 2.5, use 27.5% hydrogen peroxide as the oxidant, and add hydrogen peroxide at 4g per L of wastewater, use ferrous sulfate as the catalyst, and use ferrous salt at 8...

Embodiment 2

[0054] The pH value of a company's nitrochlorobenzene production wastewater is 13, the salt content is 2.3%, the nitrochlorobenzene content is 780 mg / L, and the chroma is 4200 times.

[0055] Under the condition that the operating temperature of the stripper is 105°C, normal pressure, and the number of theoretical plates of the stripper is 10, and the outflow from the top of the stripper is 10% of the water entering the tower, the effluent water from the bottom of the stripper The content of nitrochlorobenzene can be reduced to below 50mg / L.

[0056] Next, under the condition that the wastewater temperature is 50°C, the wastewater is subjected to light-assisted Fenton catalytic oxidation treatment. Use 98% sulfuric acid to adjust the pH of the wastewater to 3.0, use 27.5% hydrogen peroxide as the oxidant, add the amount of hydrogen peroxide at 3g per L of wastewater, use ferrous sulfate as the catalyst, and use 100mg Fe per L of wastewater 2+ For dosing, the light source is a...

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Abstract

The invention provides a method and a device used for processing nitrochlorobenzene production wastewater. The method comprises the steps that: (1) nitrochlorobenzene production wastewater is subjected to a stripping treatment; and tower-top steam of a stripping tower is directly used in a production process; (2) the pH value of water delivered from a stripping tower kettle is regulated until the water is acidic; (3) an oxidant (hydrogen peroxide) and a reducing agent (ferrous ion) are used for carrying out a photo-assisted Fenton catalytic oxidation process upon the water delivered from the stripping tower kettle under the irradiation of an ultraviolet medium-pressure mercury lamp; (4) the pH value of the water obtained from the catalytic oxidation process is regulated to approximately neutral; and reactions such as dissolved iron precipitation and decomposition of residual hydrogen peroxide in water are carried out; and (5) water obtained in the reactions is subjected to slag-water separation; the separated slag can be used as a flocculating agent; and the water reaches a standard and can be discharged. With the method provided by the invention, nitrochlorobenzene production wastewater chromaticity, COD, TOC, and nitrochlorobenzene content can be effectively reduced, and waste water can reach a discharging standard.

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 and device 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-mentioned production process, the production of each ton of nitrochlorobenzene products will produce about 1.2-1.8 tons of waste water. The waste water mainly contains nitrochlorobenzene, nit...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/04C02F1/72C02F1/32C02F1/52C02F103/36
Inventor 李海龙莫馗程学文万国晖高凤霞张宾
Owner CHINA PETROLEUM & CHEM CORP
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