A kind of wastewater treatment method after the production of nitrochlorobenzene
A technology for the treatment of nitrochlorobenzene and waste water, which is applied in the direction of natural water treatment, multi-stage water treatment, water/sewage treatment, etc. Achieve the effects of optimizing process design, saving synthesis costs, and reducing emissions
Active Publication Date: 2021-04-16
ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
View PDF22 Cites 0 Cited by
- 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0026] see figure 1 Shown, the technical scheme that the present invention adopts is: a kind of waste water treatment method after the production of nitrochlorobenzene, the concrete of described waste water treatment method comprises the following steps:
[0027] (1). Extraction: Transfer the waste water after the production of nitrochlorobenzene into the extraction kettle, add the extractant to the inside of the extraction kettle, set the extraction pressure, extraction temperature and stirring speed in the kettle, and stand for a period of time after extraction. Release the aqueous phase and the organic phase, respectively;
[0028] (2). Rectification: Transfer the extracted organic phase to the interior of the rectification tower, set the rectification temperature inside the rectification tower, and carry out rectification to obtain extractant, chlorinated benzene and nitrochlorobenzene ;
[0029] (3). Acidification: transfer the water phase extracted from the extraction ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for treating waste water after nitrochlorobenzene production. The waste water treatment method specifically includes the following steps: transferring waste water after nitrochlorobenzene production into an extraction kettle, and adding carbon tetrachloride into the extraction kettle. Extract a small amount of nitrochlorobenzene and the water phase separated from chlorobenzene, enter into the acidification kettle, add excess sulfuric acid, collect the ammonia gas generated, transfer the acidified solution into the evaporation kettle, heat, evaporate and concentrate To a certain concentration, the steam is recovered to obtain a concentrated solution of sulfuric acid containing nitric acid, and the concentrated solution is used for the production of nitrochlorobenzene after refining. After a series of treatments of evaporation and concentration, the regenerated alkaline reagent and sulfuric acid concentrate are obtained, which are recycled to the production of nitrochlorobenzene, which improves the economic benefit. Method and process design requirements for post-production wastewater treatment of chlorobenzene.
Description
technical field [0001] The invention relates to the technical field of pesticide synthesis, in particular to a method for treating waste water after nitrochlorobenzene production. 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, and has high chroma, high salinity, and difficult biodegradation. features. ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/36
CPCC02F1/04C02F1/26C02F1/58C02F9/00C02F2103/36C02F2301/08
Inventor 黄中桂蔡小林袁晓林付志平史正光朱凯明王先武钱潮涌姚周平杨华
Owner ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD