Method for processing wastewater from nitrochlorobenzene production

A technology for the production of waste water and nitrochlorobenzene, 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 methods, carbon tetrachloride problems and other problems, to achieve stable and reliable treatment effect, easy industrial scale-up, and improve the recovery rate

CN102417263AActive Publication Date: 2012-04-18CHINA PETROLEUM & CHEM CORP +1

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: CHINA PETROLEUM & CHEM CORP
Publication Date: 2012-04-18

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Abstract

The invention discloses a method for processing wastewater from nitrochlorobenzene production, comprising the following steps that: 1, wastewater is successively subject to treatment through a slag-water separator and a stripping tower and is discharged from the tower bottom of the stripping tower, then the discharged water is subject to indirect heat exchange and heating through the steam of thetower top of stripping tower, and then the heated product enters into the stripping tower for stripping; 2, the pH value of the output water from the stripping tower bottom, which is subject to indirect heat exchange and cooling through the wastewater from nitrochlorobenzene production, is regulated to acidity; 3, the acid wastewater is subject to catalytic oxidation, wherein, the oxidizing agentis hydrogen peroxide, and the catalyst is a composition of ferric salt and copper salt; 4, the pH value of the output water processed by catalytic oxidation is regulated to neutral or alkalescence to carry out precipitation reaction of dissolved copper and iron and decomposition reaction of residual H2O2 in the water; and 5, slag-water separation is carried out on the reaction effluent, the separated slag is subject to further disposal or comprehensive utilization, and the water reaches the standards of discharge after carrying out indirect heat exchange with the wastewater from nitrochlorobenzene production. The method disclosed herein can effectively reduce the chromaticity, COD and nitrochlorobenzene content of the wastewater, and realize the standard discharge of the wastewater.

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Description

technical field

[0001] The invention relates to a treatment method of organic chemical wastewater, in particular to a treatment method of refractory organic chemical wastewater, specifically a method for treatment of 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 pollutants,...

Claims

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