Method for treating p-aminodiphenylamine production device wastewater

A technology for p-aminodiphenylamine and production equipment, which is applied in the fields of natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of unreached COD content, cumbersome recovery of formic acid, and high cost of sewage pretreatment. , to achieve the effect of high processing load, short water retention time, and solving the problems of discharge and treatment

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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

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  • Method for treating p-aminodiphenylamine production device wastewater

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Effect test

Embodiment 1

[0046] Wastewater from a p-aminodiphenylamine production unit in a chemical plant: influent COD is 55000mg / L, TOC is 31920mg / L, formic acid concentration is 156950mg / L, after homogenization and containing NO 3 － Mix catalyst wastewater, add a certain amount of chlorobenzene acidic wastewater, and add a certain amount of dilution water to dilute the wastewater containing p-aminodiphenylamine to 50 times, and the Fe content is 40mg / L; add a certain amount of HNO as needed 3 To supplement a certain amount of NO 3 － , NO 3 － The final concentration is 948mg / L, so that the C / N in the wastewater is maintained at about 2.98, and dilute HCl is added to adjust the pH of the influent to 6.00, and the mixed wastewater flows into the next operation unit by itself;

[0047] Then the Fe(OH) in the wastewater 3 It settles completely in the sedimentation tank, and the sedimentation time is about 1 hour. The Fe sludge at the bottom of the sedimentation tank is sent to the filter press roo...

Embodiment 2

[0053] The waste water flow rate of a p-aminodiphenylamine production unit in a chemical plant is 144t / d, and the pollutant indicators before entering the process are: influent COD is 82000mg / L, TOC is 45195mg / L, and formic acid concentration is 242750mg / L. After quality and containing NO 3 － Mix catalyst wastewater, add a certain amount of chlorobenzene acidic wastewater, and add a certain amount of dilution water to dilute the wastewater containing p-aminodiphenylamine to 50 times, and the Fe content is 50mg / L; add a certain amount of HNO as needed 3 To supplement a certain amount of NO 3 － , NO 3 － The final concentration is 2000mg / L, so that the C / N in the wastewater is maintained at about 1.98, and dilute HCl is added to adjust the pH of the influent to 7.50, and the mixed wastewater flows into the next operation unit by itself;

[0054] Then the Fe(OH) in the wastewater 3 It settles completely in the sedimentation tank, and the sedimentation time is about 0.7h. The...

Embodiment 3

[0060] 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, and formic acid concentration is 144190mg / L. After quality and containing NO 3 －Mix catalyst wastewater, add a certain amount of chlorobenzene acidic wastewater, and add a certain amount of dilution water to dilute the wastewater containing p-aminodiphenylamine to 50 times, and the Fe content is 20mg / L; add a certain amount of HNO as needed 3 To supplement a certain amount of NO 3 － , NO 3 － The final concentration is 1061.3mg / L, so that the C / N in the wastewater is maintained at about 2.54, and dilute HCl is added to adjust the pH of the influent to 9.0, and the mixed wastewater flows into the next operation unit by itself;

[0061] Then the Fe(OH) in the wastewater 3 It settles completely in the sedimentation tank, and the sedimentation time is about 1.2h. 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: homogenizing the p-aminodiphenylamine production device wastewater, regulating the pH value, controlling the C/N ratio, precipitating, adding N and P nutritive salts, regulating the influent water temperature, carrying out 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 method for treating organic chemical wastewater, in particular to a method for treating organic chemical wastewater with high COD and high formic acid concentration, in particular to a method for treating 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 indust...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36
Inventor 程学文张宾高凤霞卢姝莫馗王珺李海龙
Owner CHINA PETROLEUM & CHEM CORP
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