Treatment method of p-aminodiphenylamine production device wastewater

A technology of p-aminodiphenylamine and production equipment, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of low COD content, high cost of sewage pretreatment, and recycling Formic acid process is cumbersome and other problems, to achieve the effect of high treatment load, short water retention time, reducing TOC and formic acid content

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method also has following problems: first, in the process that chlorine is continuously passed into inorganic alkali aqueous solution, unavoidably there will be some chlorine gas to leak in the middle of the air, easily causes air pollution; The national discharge standard is not met; finally, whether there are other pollutants in the treated wastewater, the patent does not mention
There are some following problems in this method: First, although the recovery process of formic acid in waste water is described in detail in this patent, whether the waste water after treatment contains other pollutants, this patent does not mention
Secondly, the process of recovering formic acid in this method is very cumbersome, not only need multiple sets of reactors to precipitate calcium formate to prevent excessive formic acid from leaking, but also to add a variety of materials such as N

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  • Treatment method of p-aminodiphenylamine production device wastewater

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Effect test

Embodiment 1

[0042] The waste water flow rate of a p-aminodiphenylamine production unit in a chemical plant is 100t / d, and the pollutant indicators before entering the process are: influent COD is 55000mg / L, TOC is 31920mg / L, formic acid concentration is 156950mg / L, and the waste water enters Add dilute HCl after the pH adjustment tank to adjust the pH of the influent to 4.50.

[0043] Then the wastewater flows into the homogeneous tank by itself, and contains NO 3 － The catalyst waste water was mixed, and a small amount of dilution water was added and part of the USB effluent from the return pump returned to the water inlet through the return pipe was diluted to 50 times for the waste water of the p-aminodiphenylamine production unit. The pH of the final mixed water was 6.50, NO 3 － The concentration is 948mg / L, and the C / N in the wastewater is maintained at about 2.98.

[0044] Then the wastewater enters the air flotation tank to further remove the flocculent suspended matter in the w...

Embodiment 2

[0050] The waste water flow rate of a p-aminodiphenylamine production unit in a chemical plant is 110t / d. The pollutant indicators before entering the process are: influent COD is 82000mg / L, TOC is 45195mg / L, formic acid concentration is 242750mg / L, and the waste water enters Add dilute HCl after the pH adjustment tank to adjust the pH of the influent to 6.00.

[0051] Then the wastewater flows into the homogeneous tank by itself, and contains NO 3 － The catalyst waste water was mixed, and a small amount of dilution water was added and part of the USB effluent from the reflux pump returned to the water inlet through the reflux pipe was diluted to 50 times for the waste water of the p-aminodiphenylamine production unit. The pH of the final mixed water was 9.00, NO 3 － The concentration is 2000.0mg / L, and the C / N in the wastewater is maintained at about 1.96.

[0052] Then the wastewater enters the air flotation tank to further remove the flocculent suspended matter in the wa...

Embodiment 3

[0058] The waste water flow rate of a p-aminodiphenylamine production unit in a chemical plant is 120t / d, and the pollutant indicators before entering the process are: influent COD is 48500mg / L, TOC is 30470mg / L, formic acid concentration is 144190mg / L, and the waste water enters Add dilute HCl after the pH adjustment tank to adjust the pH of the influent to 5.10.

[0059] Then the wastewater flows into the homogeneous tank by itself, and contains NO 3 － The catalyst wastewater was mixed, and a small amount of dilution water was added and part of the USB effluent from the reflux pump returned to the water inlet through the reflux pipe was diluted to 50 times for the wastewater of the p-aminodiphenylamine production unit. The pH of the final mixed water was 7.82, NO 3 － The concentration is 1061.3mg / L, and the C / N in the wastewater is maintained at about 2.54.

[0060] Then the wastewater enters the air flotation tank to further remove the flocculent suspended matter in the ...

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Abstract

The invention provides a treatment method of p-aminodiphenylamine production device wastewater, particularly a high-efficiency treatment method of process wastewater containing high-concentration formic acid. The method comprises the following steps: primary pH regulation of p-aminodiphenylamine production device wastewater, C/N ratio control in a homogenizing tank, secondary pH regulation, air floatation, N and P nutritive salt addition, influent water temperature regulation, biochemical denitrification treatment and the like. After the p-aminodiphenylamine production device wastewater is treated by the treatment procedure provided by the invention and corresponding conditions, the formic acid concentration in the wastewater can be lowered from 160000 mg/L or so to 0.1 mg/L below, and the removal ratio is up to higher than 90%. The method has the advantages of stable treatment effect and low treatment cost, is simple to operate, and can easily implement industrial application.

Description

technical field [0001] The invention relates to a treatment method for organic chemical wastewater, in particular to a treatment method for organic chemical wastewater with high COD and high formic acid concentration, in particular to a treatment method for wastewater from a p-aminodiphenylamine production device. Background technique [0002] 4-Aminodiphenylamine (also known as p-aminodiphenylamine, N-phenyl-p-phenylenediamine), trade name RT base, is an important dye and rubber additive intermediate, which is mainly used in the production of rubber anti-aging Agent 4010NA, 4020, 4010, etc. At present, in the tire manufacturing industry, only two products, 4010NA and 4020, account for more than 70% of the total amount of antioxidants. With the development of the automobile industry, the market demand for p-phenylenediamine antioxidants continues to grow. There are more than 10 synthetic processes of RT base at home and abroad, and there are mainly 4 process routes for ind...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 莫馗张宾程学文万国晖高凤霞王珺李海龙
Owner CHINA PETROLEUM & CHEM CORP
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