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Method for effectively removing organic matters in wastewater from nitrochlorobenzene production

A technology for the production of nitrochlorobenzene and waste water, which is applied in chemical instruments and methods, natural water treatment, water/sewage multi-stage treatment, etc., and can solve the requirements that nitrochlorobenzene is difficult to meet the discharge standard, lack of organic matter content reduction, The regeneration of the adsorption resin is difficult and other problems, and the treatment effect is stable and reliable, the content of organic pollutants is reduced, and the effect of easy industrial scale-up is achieved.

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, it is difficult to regenerate the adsorption resin, and nitrophenols still exist in the wastewater
[0005] In summary, there is still a lack of effective methods to reduce the content of organic matter in nitrochlorobenzene production wastewater to an ideal level (such as achieving TOC compliance)

Method used

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  • Method for effectively removing organic matters in wastewater from nitrochlorobenzene production
  • Method for effectively removing organic matters in wastewater from nitrochlorobenzene production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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.

[0026] 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.

[0027] Next, when the temperature of the waste water is 98° C., the pH of the effluent of the stripping tower is adjusted to 5.0 with 5% sulfuric acid.

[0028] Next, the wastewater is subjected to catalytic oxidation treatment, the temperature of the catalytic oxidation reaction system is controlled at 98°C, the pressure is normal pressure, and the amount of 27.5%...

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, when the temperature of the waste water is 80° C., the pH of the effluent of the stripping tower is adjusted to 2.5 with 5% sulfuric acid.

[0034] Next, the wastewater is subjected to catalytic oxidation treatment, the temperature of the catalytic oxidation reaction system is controlled at 80°C, the pressure is normal pressure, and the amount of 27.5% hydrogen peroxide is added accord...

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Abstract

A method for effectively removing organic matters in wastewater from nitrochlorobenzene production relates to a method for processing organic chemical wastewater and comprises the following steps of: 1, respectively carrying out indirect heat exchange between wastewater and effluent at the bottom of a stripper and between wastewater and steam at the top of the stripper for heating, allowing the wastewater to enter into the stripper for stripping processing, and directly reusing the cooled nitrochlorobenzene-rich stream which has undergone indirect heat exchange at the top of the stripper for the production technology; 2, adjusting pH of the cooled effluent, which has undergone indirect heat exchange with the nitrochlorobenzene production wastewater at the bottom of the stripper, to acidity; 3, carrying out catalytic oxidation processing on the wastewater, pH of which is acidic, wherein the oxidizing agent is hydrogen peroxide and the catalyst is copper sulphate. The method provided by the invention can be used to effectively reduce chroma, TOC and nitrochlorobenzene content of the wastewater.

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 treatment method for 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 pollutan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/36
Inventor 李正琪程学文莫馗万国晖侯秀华高凤霞张宾
Owner CHINA PETROLEUM & CHEM CORP
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