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 a large amount of iron sludge, which is usually hazardous solid waste, and the cost of treatment is relatively high

Method used

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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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preparation example Construction

[0048] The preparation method of heterogeneous catalytic oxidation catalyst of the present invention comprises the following steps: add organic acid complexed metal copper chloride or organic acid complexed bimetallic copper chloride + cerium chloride, add carrier impregnation under nitrogen atmosphere, organic The impregnation mass ratio of acid-complexed metal copper chloride or organic acid-complexed bimetallic copper chloride + cerium chloride and modified semi-coke carrier is 1: (0.1-5), preferably 1: (1-2), impregnated The time is 10 to 240 minutes, preferably 60 to 120 minutes; then the obtained solid is dried and calcined, preferably at 60 to 150°C for 1 to 5 hours, and then calcined at 300 to 400°C for 3 to 5 hours to obtain a heterogeneous catalytic oxidation catalyst.

[0049] In another aspect, the aforementioned heterogeneous catalytic oxidation catalyst is used for a treatment process for dephenolizing and ammonia removal of phenol-containing wastewater, comprisin...

preparation example 1

[0064] Preparation example 1: Preparation of 1# catalyst (semi-coke+5% nano-iron+5% ethylenediaminetetraacetic acid complexed CuCl 2 / CeCl 3 )

[0065] Take 100g of semi-coke (SCe) and mix it with concentrated sulfuric acid and concentrated nitric acid according to its volume at a ratio of 1:1:1, stir for 2 hours, centrifuge at 5000r / min to remove the acid solution, then wash with water until neutral, and take the pretreated SCe and nano Zero-valent iron is mixed according to the mass ratio of 20:1, and deionized water is added to prepare a mixed solution with a mass concentration of 10%. Ultrasonic at 60°C for 120min, and then placed in a constant temperature drying oven at 75°C to dry to obtain a slurry, take the slurry The pellets were compressed to 5mm particles and dried at 105°C. The particles were placed in a titanium alloy oxidation reaction tube, water vapor was introduced at 10 mL / min, the reaction temperature was controlled at 180° C. for 5 h, and the carrier was ...

Embodiment 1

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

[0072] Adjust the pH of the DNT wastewater to 4. According to the COD of the wastewater, add the amount of hydrogen peroxide so that the molar ratio of hydrogen peroxide to COD is 1, pass it into the catalytic oxidation reactor, and add 1# catalyst. The reaction temperature is 80°C and the space velocity is 2h-1. The reaction pressure is 0.5MPa;. Nitrogen is introduced to dilute the oxygen in the exhaust gas of the reaction tower so that the oxygen concentration is below 4%; the pH value of the treated wastewater is adjusted to 12 to form free ammonia, and the diluted exhaust gas is blown off the reaction product water to The ammonia nitrogen is volatilized and removed. The total phenol content in the effluent was 290mg / L, with a removal rate of 84%; the DNT in the effluent was 1mg / L, with a removal rate of 95%; the biochemical property increased from 0.09 to 0.38, and the ammonia nitrogen content decreased to 890m...

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PUM

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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
CPCB01J31/223B01J31/26C02F1/722B01J2531/16C02F2101/345B01J35/61
Inventor 姜晓锋王诗涵范珍龙张宏科
Owner WANHUA CHEM GRP CO LTD
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