Treatment method of nitrochlorobenzene production wastewater
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A technology for nitrochlorobenzene and waste water production, which is applied in natural water treatment, degassed water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of lack of complete and effective means, difficulty in regeneration of adsorption resin, etc. It is easy to enlarge industrially, the processing effect is stable and reliable, and the effect of reducing chromaticity
Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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Although the patent can effectively separate nitrochlorobenzene from nitrochlorobenzene production wastewater, the nitrophenols in the wastewater still need to be treated, and the regen
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Embodiment 1
[0054] The pH value of a company's nitrochlorobenzene production wastewater is 12.0, the salt content is 2.3%, the content of nitrochlorobenzene is 1100 mg / L, and the content of nitrophenols is 800 mg / L. In addition, it also contains a small amount of chlorobenzene, Pollutants such as benzene, the chromaticity is more than 5000 times.
[0055] Under the condition that the operating temperature of the stripper is 96-110°C, normal pressure, and the number of theoretical plates of the stripper is 20, after the first step of treatment, the content of nitrochlorobenzene in the effluent of the stripper can be reduced To below 30mg / L;
[0056] Next, adjust the pH of the wastewater to 2.5 with 98% sulfuric acid when the wastewater temperature is 90°C;
[0057] Next, use 27.5% hydrogen peroxide as the oxidant, and the dosage of hydrogen peroxide is 4g per L of waste water. Ferrous sulfate is used as the catalyst, and the dosage of ferrous sulfate is 80mg Fe per L of waste water. 2+ D...
Embodiment 2
[0061] The pH value of a company's nitrochlorobenzene production wastewater is 11.8, the salt content is 2.0%, the content of nitrochlorobenzene is 800mg / L, and the content of nitrophenols is 500mg / L. In addition, it also contains a small amount of chlorobenzene, Pollutants such as benzene, the chromaticity is more than 5000 times.
[0062] Under the condition that the operating temperature of the stripper is 96-110°C, normal pressure, and the number of theoretical plates of the stripper is 10, after the first step of treatment, the content of nitrochlorobenzene in the effluent of the stripper can be reduced To below 50mg / L;
[0063] Next, adjust the wastewater pH to 3.0 with 98% sulfuric acid when the wastewater temperature is 60°C;
[0064] Next, use 27.5% hydrogen peroxide as the oxidant, and the dosage of hydrogen peroxide is 3g per L of wastewater. Ferrous sulfate is used as the catalyst, and the dosage of ferrous sulfate is 120mg Fe per L of wastewater. 2+ Dosing is ca...
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Abstract
The invention relates to a treatment method of nitrochlorobenzene production wastewater, in particular to the treatment method of organic chemical wastewater. The treatment method comprises the following steps: 1. the waste water enters a stream stripping tower for stream stripping treatment after successively carrying out indirect heat-exchange temperature rise with effluent from the tower kettle of the steam stripping tower and the steam on the tower top of the steam stripping tower, and the steam on the tower top of the steam stripping tower and rich in nitrochlorobenzene is directly reused for the production technology after indirect heat-exchange cooling; 2. the pH value of the effluent from the tower kettle of the steam stripping tower is regulated to be acid, wherein the effluent from the tower kettle of the steam stripping tower is subjected to the indirect heat-exchange cooling by utilizing the nitrochlorobenzene production wastewater; 3. the catalytic oxidation treatment is carried out on the wastewater with the pH value of being acid, an oxidant is hydrogen peroxide, and a catalyst is ferrous sulphate; 4. the pH value of the effluent of the catalytic oxidation treatment is regulated to be close to neutrality and then the effluent of the catalytic oxidation treatment is precipitated and decomposed; and 5. the slag-water separation is carried out on the reaction effluent, the separated slag is comprehensively utilized, and the water reaches emission standard and can be discharged. The method has the advantages that the chromaticity and the COD (Chemical Oxygen Demand) of the wastewater, and the content of characteristic pollutants can be effectively reduced; the wastewater reaches emission standard and can be discharged.
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-mentioned production process, about 1.2 tons of waste water will be produced per ton of nitrochlorobenzene products. The waste water mainly contains nitrochlorobenzene, nitrochlorophenol, nitrophenol a...
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