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Method for treating aluminum diethyl phosphinate wastewater.

A technology of diethylphosphinic acid and a treatment method, which is applied in the field of treatment of aluminum diethylphosphinate wastewater, can solve the problems of low degradation rate and the like, and achieve the effect of efficient removal

Inactive Publication Date: 2016-10-12
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the very stable chemical properties of aluminum diethylphosphinate, even under the strong oxidation conditions of nitric acid and perfluoric acid boiling, the degradation rate is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Soak 40-mesh activated carbon in 0.3M nitric acid solution for 24 hours, then rinse repeatedly with distilled water until neutral, and dry for later use;

[0047] (2) Mix 20wt% ferrous sulfate aqueous solution, 15wt% ferric chloride aqueous solution and 5wt% copper sulfate aqueous solution in a mass ratio of 1:1:1 to obtain a mixed solution of iron and copper (converted according to the amount of raw material added, the Fe in the mixed solution of iron and copper 2+ Content 2.46wt%, Fe 3+ Content 1.73wt% and Cu 2+ content 0.67wt%), the activated carbon and the iron-copper mixed solution after the treatment in step (1) are mixed according to the dosage ratio of 1g: 16mL, and then placed in a boiling water bath for 4h, cooled and filtered, then placed in 300°C for roasting for 2h under nitrogen protection, Obtain activated carbon supported metal catalyst;

[0048] (3) Get 100mL aluminum diethylphosphinate waste water (COD: 4229mg / L, TOC: 1013mg / L, organophosphorus:...

Embodiment 2

[0053] (1) Soak 30-mesh activated carbon in 0.5M nitric acid solution for 24 hours, then rinse repeatedly with distilled water until neutral, and dry for later use;

[0054] (2) Mix 25wt% ferrous sulfate aqueous solution, 30wt% ferric chloride aqueous solution and 10wt% copper sulfate aqueous solution in a mass ratio of 1:1:1 to obtain a mixed solution of iron and copper (converted according to the amount of raw material added, the Fe in the mixed solution of iron and copper 2+ Content 3.07wt%, Fe 3+ Content 3.46wt% and Cu 2+ Content 1.33wt%), the activated carbon and the iron-copper mixed solution after the treatment of step (1) are mixed according to the dosage ratio of 1g: 20mL and then placed in a boiling water bath for 4h, cooled and filtered, then placed in 250°C for roasting for 4h under nitrogen protection, Obtain activated carbon supported metal catalyst;

[0055] (3) Get 100mL aluminum diethylphosphinate waste water (COD: 4436mg / L, TOC: 1153mg / L, organophosphorus:...

Embodiment 3

[0060] (1) Soak 50-mesh activated carbon in 0.1M nitric acid solution for 48 hours, then rinse repeatedly with distilled water until neutral, and dry for later use;

[0061] (2) Mix 30wt% ferrous sulfate aqueous solution, 20wt% ferric chloride aqueous solution and 6wt% copper sulfate aqueous solution in a mass ratio of 1:1:1 to obtain a mixed solution of iron and copper (converted according to the amount of raw material added, the Fe in the mixed solution of iron and copper 2+ Content 3.68wt%, Fe 3+ Content 2.3wt% and Cu 2+ Content 0.8wt%), the activated carbon and iron-copper mixed solution after the treatment in step (1) are mixed according to the dosage ratio of 1g: 18mL, placed in a boiling water bath for 6h, cooled and filtered, placed in 400°C for 2h under nitrogen protection, and roasted for 2h. Obtain activated carbon supported metal catalyst;

[0062] (3) Get 100mL aluminum diethylphosphinate waste water (COD: 4436mg / L, TOC: 1153mg / L, organophosphorus: 632.42mg / L),...

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Abstract

The invention belongs to the technical field of wastewater treatment, in particular to a method for treating aluminum diethyl phosphinate wastewater. The method provided by the invention comprises the following steps: a) carrying out a heating reaction between the aluminum diethyl phosphinate wastewater and oxidants in the presence of an activated carbon supported metal catalyst to obtain oxidized wastewater, wherein the oxidants comprise hydrogen peroxide and sodium persulfate, and iron element and copper element are supported on the carrier activated carbon of the activated carbon supported metal catalyst; b) mixing the oxidized wastewater with a dephosphorizing precipitant to obtain treated wastewater. The method has the advantages that valence variation of iron and copper supported on the catalyst is fully utilized to catalyze hydrogen peroxide to generate OH<-> and activate sodium persulfate to generate SO<4->., and the two radicals are coupled mutually to oxidize aluminum diethyl phosphinate and degradation products thereof, so that aluminum diethyl phosphinate in the aluminum diethyl phosphinate wastewater is degraded effectively, and phosphorus in the aluminum diethyl phosphinate wastewater is further removed efficiently.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a treatment method for aluminum diethylphosphinate waste water. Background technique [0002] In recent years, the research on alkylphosphinate flame retardants as green and environment-friendly flame retardants has become one of the hotspots in the development and research of the phosphorus-based flame retardant industry. Aluminum diethylphosphinate [(C 2 h 5 C 2 h 5 P(O)O) 3 Al] has the advantages of small particle size, high whiteness, good thermal stability, and non-toxicity. It is widely used in the flame retardancy of thermoplastics, thermosetting plastics, fibers and textiles. The main molecular structure of aluminum diethylphosphinate is The chemical bonds of P-C, P=O, P-O, itself has a higher phosphorus content. [0003] During the production and use of aluminum diethylphosphinate, a large amount of wastewater containing aluminum diethylphosphinate will be produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/52C02F1/72C02F1/722C02F1/725C02F2101/34C02F2301/08
Inventor 林亲铁何忠坤王孝武
Owner GUANGDONG UNIV OF TECH
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