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Catalytic oxidation treatment method used for neutralization of wastewater with 3,3'-dichlorobenzidine dihydrochloride

A technology of dichlorobenzidine hydrochloride and catalytic oxidation, which is applied in the fields of oxidized water/sewage treatment, natural water treatment, chemical instruments and methods, etc., can solve problems such as affecting product quality, large energy consumption, accumulation, etc. Prospects for industrialization, low energy consumption, and the effect of simple process flow

Active Publication Date: 2018-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when waste acid is used mechanically, by-product organic matter will gradually accumulate, thereby affecting product quality
Patent CN 1752032A, industrial wastewater 3,3-dichlorobenzidine hydrochloride produces mixed acid treatment and recovery process, using magnesium-containing ore to react with sulfuric acid to reduce the acidity of wastewater and extract magnesium sulfate at the same time, but this method cannot effectively reduce Organic matter content in wastewater; patent CN 101372381A, a method and device for resourceful treatment of 3,3'-dichlorobenzidine hydrochloride wastewater, through evaporation, rectification, decolorization, filtration, cooling, crystallization, separation and other steps Treat the wastewater, recover the hydrochloric acid and sulfuric acid, and obtain the by-product of o-chloroaniline sulfate
However, the process of this method is complicated, and the evaporation, rectification and other units all have large energy consumption. From the perspective of economy, its industrial application is more difficult.

Method used

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  • Catalytic oxidation treatment method used for neutralization of wastewater with 3,3'-dichlorobenzidine dihydrochloride
  • Catalytic oxidation treatment method used for neutralization of wastewater with 3,3'-dichlorobenzidine dihydrochloride

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Add neutralization waste water into the four-neck flask, start stirring, drop lye into the neutralization waste water with a dropping funnel, measure the pH value after stirring evenly. Stop the dropwise addition when the pH reaches 4, keep stirring for 15 min, then transfer to a suction filter bottle for suction filtration, and obtain a clear filtrate after filtering off the precipitate.

[0021] Fill the catalytic oxidation reactor with activated carbon catalyst, the catalyst filling volume is 1 / 2 of the reactor volume, add tap water until the liquid level is flush with the catalyst surface. The filtrate and tap water are mixed in a ratio of 1:3 and then poured into the top of the catalytic oxidation reactor continuously, and air is continuously fed in from the bottom of the reactor. The volume flow rate (GHSV) of air passing through the catalyst per unit time is 40 h -1 , The ratio of mixed wastewater flow rate to air flow rate is 1:170. Under the action of the cat...

Embodiment 2

[0023] Add neutralization waste water into the four-neck flask, start stirring, drop waste alkali into the neutralization waste water with a dropping funnel, measure its pH value after stirring evenly. Stop the dropwise addition when the pH reaches 5, keep stirring for 10 min, then transfer to a suction filter bottle for suction filtration, and obtain a clear filtrate after filtering off the precipitate.

[0024] Fill the catalytic oxidation reactor with activated carbon catalyst, the catalyst filling volume is 1 / 2 of the reactor volume, add distilled water until the liquid level is flush with the catalyst surface. The filtrate and distilled water are mixed in a ratio of 1:2, and then poured into the top of the catalytic oxidation reactor continuously, and air is continuously fed in from the bottom of the reactor. The volume flow rate (GHSV) of air passing through the catalyst per unit time is 20 h -1 , The ratio of mixed wastewater flow rate to air flow rate is 1:130. , und...

Embodiment 3

[0026] Add neutralization waste water into the four-neck flask, start stirring, drop waste alkali into the neutralization waste water with a dropping funnel, measure its pH value after stirring evenly. Stop the dropwise addition when the pH reaches 4, keep stirring for 10 min, then transfer to a suction filter flask for suction filtration, and obtain a clear filtrate after filtering off the precipitate.

[0027] Fill the catalytic oxidation reactor with activated carbon catalyst, the catalyst filling volume is 2 / 3 of the reactor volume, add deionized water until the liquid level is flush with the catalyst surface. The filtrate is mixed with deionized water at a ratio of 1:3 and then poured into the top of the catalytic oxidation reactor continuously, and air is continuously fed in from the bottom of the reactor. The volume flow rate (GHSV) of air passing through the catalyst per unit time is 25 h -1 , The ratio of mixed wastewater flow rate to air flow rate is 1:140. , under...

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Abstract

The invention discloses a catalytic oxidation treatment method used for neutralization of wastewater with 3,3'-dichlorobenzidine dihydrochloride. The catalytic oxidation treatment method comprises following steps: 1, mixing and suction filtration, wherein waste alkali is added into wastewater for neutralization until the acid-base property of wastewater is adjusted to be weak acidity, and suctionfiltration is carried out so as to obtain a clarified solution; 2, catalytic oxidation, wherein an active carbon catalyst is introduced into a catalytic oxidation reactor, tap water, distilled water,or deionized water is added, a filtrate obtained in step 1 is mixed with tap water, distilled water, or deionized water at a certain ratio, an obtained mixture is pumped to the top of the catalytic oxidation reactor continuously so as to realize oxidation reaction at normal temperature, a part of oxidation wastewater obtained via reaction is recycled, is mixed with the filtrate at a certain ratio,and an obtained mixed solution is subjected to oxidation reaction in the catalytic oxidation reactor, and the left oxidation wastewater is subjected to biochemical treatment. The catalytic oxidationtreatment method is capable of destroying the structure of organic matters in wastewater effectively, and converting large molecular organic matters into small molecular organic matters with low biochemical influence, so that wastewater biochemical treatment is realized. The catalytic oxidation reaction is carried out at normal temperature, energy consumption is low; the technical process is simple; and the industrialization prospect is promising.

Description

technical field [0001] The invention relates to a catalytic oxidation treatment method for 3,3'-dichlorobenzidine hydrochloride neutralized wastewater, which belongs to the fields of chemical treatment and chemical technology. Background technique [0002] 3,3'-Dichlorobenzidine, referred to as DCB, is an important intermediate in the production of dichlorobenzidine-based organic pigments. The output of a series of organic pigments based on it accounts for about 25% of the total organic pigments. It is widely used in Production of ink, paint, rubber, plastic and other coloring and pigment printing slurry pigment dyeing slurry. Its commodity generally exists in the form of hydrochloride, and its structural formula is: [0003] [0004] The production of 3,3'-dichlorobenzidine hydrochloride is based on o-nitrochlorobenzene, which is reduced in an alkaline medium to generate 2,2 ’ - Dichlorohydroazobenzene (DHB), then 2,2 ’ - Dichlorohydroazobenzene is transposed in acidi...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/74C02F103/36C02F101/30C02F101/38C02F101/36
Inventor 史乐萌付春黄伟韦志强孙阿沁王天慧郁铭高留冕
Owner CHINA PETROLEUM & CHEM CORP
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