Method for quickly and efficiently degrading high-concentration unsym-dimethylhydrazine wastewater

An unbalanced dimethylhydrazine, high-concentration technology, applied in chemical instruments and methods, water pollutants, oxidized water/sewage treatment, etc. Improve utilization efficiency, improve treatment effect, and reduce the effect of adding amount

Active Publication Date: 2015-11-11
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0002] Unsymmetrical dimethylhydrazine ((CH 3 ) 2 NNH 2 , UDMH) is widely used in the field of aerospace technology as a high-efficiency fuel, but unsymmetrical dimethylhydrazine has the common toxicity of hydrazine compounds, and its production, transportation, storage, improper discharge, etc., all bring The serious sewage pollution problem, therefore, the standard discharge technology of unsymmetrical dimethylhydrazine has attracted much attention
[0003] According to existing technical reports, the traditional catalysts used for activation reactions of chemical bonds such as C–O, C–N, N–N, and N=O mainly include transition metal complexes such as ruthenium (Ru), rhodium (Rh), and palladium (Pd). complexes, however these complexes are often expensive and disposable
[0004] A low-cost Fenton process widely used in the wastewater industry, the catalyst is Fe 2+ , the oxidizing agent is H 2 o 2 , the degradation process is accompanied by Fe 2+ Oxidation to Fe 3+ , the process has the following problems: on the one hand, the Fe in the aqueous solution 3+ On the other hand, once the pH of the solution is > 5, the wastewater system will generate flocculent ferric hydroxide precipitates, and a flocculation precipitation process step is added. If the pH range is kept low, the pH index will not meet the discharge requirements; Then the catalyst Fe 2+ Poor stability and difficult to store; while the catalyst Fe 2+ Own consumption of oxidant H 2 o 2 , such that H 2 o 2 Reduced utilization

Method used

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  • Method for quickly and efficiently degrading high-concentration unsym-dimethylhydrazine wastewater
  • Method for quickly and efficiently degrading high-concentration unsym-dimethylhydrazine wastewater
  • Method for quickly and efficiently degrading high-concentration unsym-dimethylhydrazine wastewater

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Embodiment 1

[0021] Weigh 35g of tetraethyl orthosilicate (TEOS), 70g of absolute ethanol, and 140g of deionized water to make a mixed solution, the mass ratio of TEOS: absolute ethanol: deionized water is 1:2:4, and weigh 0.218g of Add the ferrous acetate solid into the mixed solution and stir to dissolve, add dilute nitric acid to adjust the pH to 3, add a small amount of diethanolamine to the above solution to condense and reflux, then put the obtained product into an oven, dry the water to form a gel, and dry the gel Put it into a muffle furnace and calcinate at 300°C for 3h to obtain nano-iron-based SiO 2 , the nano-iron-based SiO 2 Grind to obtain a powdery solid, weigh 0.22g rhodium acetate, add it to absolute ethanol, dissolve it and immerse it in nano-iron-based SiO 2 Stir in the powder solid to form a suspension, stir and impregnate for 10 hours, so that Rh is wrapped on the surface of Fe, put it into a muffle furnace after drying, and calcinate at 300 ° C for 3 hours to obtain ...

Embodiment 2

[0023] Weigh 35g of tetraethyl orthosilicate (TEOS), 105g of absolute ethanol, and 210g of deionized water to make a mixed solution, the mass ratio of TEOS: absolute ethanol: deionized water is 1:3:6, and weigh 0.544g of Add the ferrous acetate solid into the mixed solution and stir to dissolve, add dilute nitric acid to adjust the pH to 3, add a small amount of diethanolamine to the above solution to condense and reflux, then put the obtained product into an oven, dry the water to form a gel, and dry the gel Put it into a muffle furnace and calcinate at 350°C for 4h to obtain nano-iron-based SiO 2 , the nano-iron-based SiO 2 Grind to obtain a powdery solid, weigh 0.55g rhodium acetate, add it to absolute ethanol, dissolve it and immerse it in nano-iron-based SiO 2 Stir in the powder solid to form a suspension, stir and impregnate for 10 hours, so that Rh is wrapped on the surface of Fe, put it into a muffle furnace after drying, and calcinate at 350 ° C for 4 hours to obtain...

Embodiment 3

[0025]Weigh 35g of tetraethyl orthosilicate (TEOS), 140g of absolute ethanol, and 280g of deionized water to make a mixed solution, the mass ratio of TEOS: absolute ethanol: deionized water is 1:4:8, and weigh 1.088g of Add the ferrous acetate solid into the mixed solution and stir to dissolve, add dilute nitric acid to adjust the pH to 3, add a small amount of diethanolamine to the above solution to condense and reflux, then put the obtained product into an oven, dry the water to form a gel, and dry the gel Put it into a muffle furnace and calcinate at 410°C for 6h to obtain nano-iron-based SiO 2 , the nano-iron-based SiO 2 Grind to obtain a powdery solid, weigh 1.1g rhodium acetate, add it to absolute ethanol, dissolve it and immerse it in nano-iron-based SiO 2 Stir in the powder solid to form a suspension, stir and impregnate for 10 hours, so that Rh is wrapped on the surface of Fe, put it into a muffle furnace after drying, and calcinate at 410 ° C for 6 hours to obtain a...

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Abstract

The invention discloses a method for quickly and efficiently degrading high-concentration unsym-dimethylhydrazine (UDMH) wastewater. The method comprises the following steps: performing catalytic oxidation on H2O2 by use of a nano sandwich-structured iron-based catalyst and a hydrogen peroxide stabilizer to produce a hydroxyl free radical (.OH); quickly and efficiently degrading UDMH and derivatives thereof. The catalyst is coupled with the free radical for reaction, the practicability is high, COD in UDMH wastewater can be greatly removed at a relatively low temperature and within a relatively wide pH range, and high-toxic UDMH is oxidized into ammonium salt NH4<+>, HCHO, CO2 and the like. The method can efficiently and quickly degrade high-concentration UDMH wastewater, the hydrogen peroxide utilization efficiency can be remarkably improved after the hydrogen peroxide stabilizer is added, the adding amount of hydrogen peroxide is reduced and the treatment effect is improved.

Description

technical field [0001] The invention relates to a catalyst preparation method and a catalytic oxidation process for rapidly and efficiently degrading unsymmetrical dimethylhydrazine. It is a method for degrading high-concentration unsymmetrical dimethylhydrazine wastewater by using a catalyst wet catalytic oxidation method with a hydrogen peroxide stabilizer. The technology belongs to Nano-environmental protection water treatment technology field. Background technique: [0002] Unsymmetrical dimethylhydrazine ((CH 3 ) 2 NNH 2 , UDMH) as a high-efficiency fuel is widely used in the field of aerospace technology, but unsymmetrical dimethylhydrazine has the common toxicity of hydrazine compounds, and its production, transportation, storage, improper discharge, etc., all bring The serious sewage pollution problem has been caused. Therefore, the standard discharge technology of unsymmetrical dimethylhydrazine has always been concerned. [0003] According to existing technical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B01J23/83C02F101/38
Inventor 吴敏李伟杰周宇骋梁美玲曾平川苗春存
Owner SOUTHEAST UNIV
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