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A method for electrochemical hydrogenation treatment of wastewater containing low-concentration fluorinated aromatic hydrocarbons

A technology of fluorinated aromatic hydrocarbons and treatment methods, applied in the field of electrochemical hydrogenation treatment, which can solve the problems of using explosive hydrogen, poor reaction selectivity, harsh reaction conditions, etc.

Active Publication Date: 2017-12-05
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention can not only solve the problems of poor reaction selectivity, harsh reaction conditions and massive use of explosive hydrogen in the existing wastewater treatment technology for fluorinated aromatics pollutants, but also realize high-efficiency electrochemical hydrogenation treatment of low-concentration fluorinated aromatics pollutants

Method used

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  • A method for electrochemical hydrogenation treatment of wastewater containing low-concentration fluorinated aromatic hydrocarbons
  • A method for electrochemical hydrogenation treatment of wastewater containing low-concentration fluorinated aromatic hydrocarbons
  • A method for electrochemical hydrogenation treatment of wastewater containing low-concentration fluorinated aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Electrochemical Hydrogenation Treatment of Contaminated Wastewater Containing p-Fluorophenol

[0032] 1000mL aqueous solution of 0.1mmol / L p-fluorophenol+5mmol / L sodium sulfate+5mmol / L sodium chloride was used as catholyte; 1mol / L sulfuric acid aqueous solution was used as anolyte. Rhodium-modified nickel foam (1g Rh / m 2 ) as the cathode, the platinum-plated titanium mesh as the anode, the diaphragm plate frame tank as the electrolytic reactor, and the perfluorosulfonic acid membrane as the diaphragm.

[0033] During the electrolysis process, the temperature is controlled at 20-25°C, and the current density is controlled at 5mA / dm 2 , the catholyte pH control 2.5 ~ 3.5. Stop the electrolysis after feeding 8F / mol 4-fluorophenol electricity. After the electrolysis, the catholyte (30mL) was transferred to the split funnel, and the catholyte was extracted three times with 30mL dichloromethane; after the extraction, three parts of the extract were combined, and ...

Embodiment 2～ Embodiment 29

[0036] Embodiment 2-Example 29 Electrochemical Hydrogenation Treatment of Wastewater Contaminated by Different Fluorinated Aromatic Hydrocarbons

[0037] Embodiment 2 to Embodiment 29 were carried out according to the experimental parameters in Table 1, and the parameters and operations not described in Table 1 were the same as in Embodiment 1.

[0038] Table 1 Embodiment 2~Example 29 Experimental conditions and results

[0039]

[0040]

[0041]

[0042] a 1mol / L sodium hydroxide aqueous solution is the anolyte; the ruthenium-plated titanium mesh is the anode.

[0043] Comparative examples 1 to 6 use different rhodium-modified cathodes for electrochemical hydrogenation treatment of p-fluorophenol polluted wastewater

[0044] Comparative Example 1 to Comparative Example 6 were carried out according to the experimental parameters in Table 2, and the other unspecified parameters and operations were the same as in Example 1.

[0045] Table 2 Comparative Example 1~Comp...

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Abstract

The invention discloses an electrochemical hydrogenation treatment method for waste water containing low-concentration fluorinated aromatic hydrocarbons. The method is as follows: adding a supporting electrolyte to the waste water containing 0.01-1 mmol / L fluorinated aromatic hydrocarbons to obtain electrolytic catholyte; The electrolytic reaction is carried out in a diaphragm electrolyzer with the rhodium-modified conductive material as the cathode and the chemically inert conductive material as the anode. During the electrolysis process, the pH of the electrolytic catholyte is controlled at 1-6, the temperature is 0-50°C, and the current density is 1-20mA / dm2; After the electrolysis reaction is finished, the complete hydrogenation of fluorine substituents and aromatic rings in fluorinated aromatics is realized; the reaction of the present invention can be carried out at normal temperature and pressure and in an organic solvent-free water system; low-concentration fluorinated aromatics in waste water The fluorine substituents and aromatic rings of pollutants can be completely hydrogenated, which can greatly improve the biodegradability of wastewater and reduce the toxicity of wastewater; it can efficiently treat low-concentration (0.01-1mmol / L) fluorinated aromatic hydrocarbon wastewater to achieve fluorine The complete conversion of substituted aromatic hydrocarbons, the complete hydrogenation rate of fluorine substituents and aromatic rings is greater than 95%, and the yield of fluoride ions is greater than 95%.

Description

(1) Technical field [0001] The invention relates to an electrochemical hydrogenation treatment method for low-concentration fluorinated aromatic hydrocarbon polluted wastewater, in particular to an electrochemical complete hydrogenation method for fluorine substituents and aromatic rings of fluorinated aromatic hydrocarbon pollutants in wastewater. (2) Background technology [0002] Fluorinated aromatic hydrocarbons are widely used as important intermediates and raw materials in the manufacture of modern pesticides and medicines. In 1994, the global output of fluorinated aromatic hydrocarbons was 10,000 tons; in 2000, its global output increased to 35,000 tons; in 2013, 30-40% of the world’s pesticides and 25% of pharmaceuticals were fluorine-containing organic substances, of which sales Three of the top 5 medicines are fluorinated organics. The rapid increase in the production of fluorinated aromatic hydrocarbons comes from the optimization of the molecular properties of i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C25B3/04C25B11/04C25B11/08C25B3/25
Inventor 徐颖华马红星李姗姗葛婷婕马淳安
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD