Heterogeneous catalytic oxidation catalyst, preparation method and method for treating phenolic wastewater

A heterogeneous catalytic oxidation and catalyst technology, applied in the direction of oxidation water/sewage treatment, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc., can solve the problem of high cost, achieve low cost, avoid Metal loss, no secondary pollution effect

Active Publication Date: 2021-08-27
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conventional pretreatment technologies, such as the traditional Fenton treatment technology, will produce

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  • Heterogeneous catalytic oxidation catalyst, preparation method and method for treating phenolic wastewater
  • Heterogeneous catalytic oxidation catalyst, preparation method and method for treating phenolic wastewater
  • Heterogeneous catalytic oxidation catalyst, preparation method and method for treating phenolic wastewater

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Example Embodiment

[0048] Heterogeneous catalytic oxidation of the catalyst preparation process of the present invention, comprising the steps of: an organic acid or an organic acid complex metal copper chloride copper chloride + bimetallic complex of cerium chloride, the impregnated carrier was added under a nitrogen atmosphere, the organic acid or an organic acid complex metal copper chloride copper chloride + bimetallic complex impregnated mass ratio of cerium chloride and char modified carrier is 1: (0.1-5), preferably 1: (1-2) dipped time 10 ~ 240min, preferably 60 ~ 120min; and the resulting solid was dried, calcined, preferably at 60 ~ 150 ℃ dried 1 ~ 5h, and then calcined at 300 ~ 400 ℃ 3 ~ 5h, to obtain heterogeneous catalytic oxidation catalysts.

[0049] Another aspect, the catalyst for the heterogeneous catalytic oxidation of a phenolic Dephenol wastewater treatment process of ammonia, comprising the following steps in addition:

[0050] (1) The phenol-containing waste water was adjusted...

Example Embodiment

[0064] Preparation 1: 1 # Catalyst Preparation (Half Trade + 5% Nano - iron + 5% Ethylenediamine Tetracera Colescence Cucl 2 / CECL 3 )

[0065] Take 100G half (SCE) in volume and concentrated sulfuric acid, concentrated nitric acid is mixed at 1: 1: 1, etc., stirred for 2 h, 5000 r / min, then remove the acid solution, then washed to neutral, take pre-treatment SCE and nanometers The zero-valent iron is mixed according to the mass ratio of 20: 1, and the deionized water is used to prepare a mixture of a mass concentration of 10%, at 60 ° C ultrasonic 120min, then placed in a constant temperature drying oven 75 ° C to give a slurry, slurry The conventional particles were stained to 5 mm, dried at 105 ° C. The particles were placed in a titanium alloy oxidation reaction tube, and 10 ml / min was passed into water, and the reaction temperature was controlled at 180 ° C for 5 h, cooled to room temperature to obtain a carrier.

[0066] The bronze and copper chloride were mixed with th...

Example Embodiment

[0071] Example 1: DNT wastewater treatment (1 # catalyst)

[0072] Adjust the DNT wastewater pH to 4, according to the wastewater COD, the amount of bioxide is put into the hydrogen peroxide and the COD molar ratio is 1, and the catalytic oxidation reactor is introduced, and the 1 # catalyst is added, the reaction temperature is 80 ° C, the air speed is 2H-1, The reaction pressure is 0.5 MPa; Nitrogen is diluted in nitrogen to dilute the oxygen in the reaction tower, so that the oxygen concentration reaches 4% or less; the pH of the wastewater is adjusted to 12 to form free ammonia, and the diluted exhaust gas is blown off, Make ammonia nitrogen volatile. The total amount of water was 290 mg / L, the removal rate was 84%; the water DNT was 1 mg / L, the removal rate was 95%; the biochemistry was raised from 0.09 to 0.38, the ammonia nitrogen content was reduced to 890 mg / L, and the removal rate of 60%.

[0073] The same batch of wastewater treatment in accordance with the reacti...

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Abstract

The invention discloses a heterogeneous catalytic oxidation catalyst, a preparation method and a method for treating phenolic wastewater. The catalyst comprises the following components: nano-iron modified semi-coke serving as a carrier, and loaded organic acid complexed metal copper and/or rare earth metal cerium serving as an active component. The catalyst prepared by the invention has the characteristics of high catalytic efficiency, small metal loss amount, good stability and the like, and is beneficial to converting various phenols in phenol-containing wastewater into small molecular acids, improving the biochemical property of the wastewater, removing ammonia nitrogen in the wastewater and reducing the wastewater treatment cost.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a heterogeneous catalytic oxidation catalyst, a preparation method, and a method for using the same in dephenolization and ammonia removal of DNT waste water. Background technique [0002] The TDI (toluene diisocyanate) plant includes DNT (dinitrotoluene) hydrogenation to TDA (toluene diamine), TDA phosgenation to TDI and other processes. The wastewater generated by the DNT process mainly contains DNT, dinitrocresol, and ammonia nitrogen. etc. DNT wastewater treatment technology involves few schemes, and currently it is mainly based on incineration or pretreatment and regeneration treatment technology. However, conventional pretreatment technologies, such as the traditional Fenton treatment technology, will produce a large amount of iron sludge, which is usually hazardous solid waste, and the treatment cost is relatively high. Using the heterogeneous catalytic oxid...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J31/26B01J35/10C02F1/72C02F101/34
CPCB01J31/223B01J31/26B01J35/1004C02F1/722B01J2531/16C02F2101/345
Inventor 姜晓锋王诗涵范珍龙张宏科
Owner WANHUA CHEM GRP CO LTD
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