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Electrochemical method for hydrodechlorination of chlorinated organic pollutant

An organic pollutant, electrochemical technology, applied in the direction of electrolytic organic production, electrolytic process, electrolytic components, etc., can solve the problems of low current density, low current efficiency, low utilization rate of palladium, etc., to achieve simplified structure, high current efficiency, The effect of reducing the volume

Active Publication Date: 2015-11-04
SHANGHAI LINKCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can solve the problems of low palladium utilization rate, low current efficiency, low current density and high electrolysis voltage in the existing palladium-catalyzed electrochemical dechlorination technology.

Method used

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  • Electrochemical method for hydrodechlorination of chlorinated organic pollutant
  • Electrochemical method for hydrodechlorination of chlorinated organic pollutant
  • Electrochemical method for hydrodechlorination of chlorinated organic pollutant

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 Palladium catalyzes the electrochemical hydrogenation dechlorination of 4-chlorophenol sodium into phenol

[0036] In a diaphragmless electrolyzer, a palladium-modified expanded silver screen was used as the cathode (1g Pd / m 2 ), the Hastelloy C 276 nickel alloy mesh is used as the anode, and the distance between the cathode and the anode is 0.5cm. The aqueous solution of 1000mL 1mol / L NaOH + 250g 4-chlorophenate sodium is the electrolyte. During the electrolysis process, the temperature is controlled at 20-25°C, and the current density is controlled at 10A / dm 2 , the electrolysis voltage is 2.8-3.2V, the pH of the catholyte is controlled at 13.5-14, and the cathode potential is -0.8--1.2V vs. Ag / AgCl (3.0M KCl). Stop the electrolysis after feeding 2F / mol 4-chlorophenol sodium electricity. After the catholyte was transferred to the beaker, sulfuric acid was added to adjust the pH=4, and then the yield of phenol was analyzed by high performance liquid pha...

Embodiment 2

[0038] Embodiment 2 Palladium catalyzes the electrochemical hydrogenation dechlorination of chlorinated phenol mixture into phenol

[0039] In a diaphragmless electrolyzer, a palladium-modified expanded silver screen was used as the cathode (1g Pd / m 2 ), the Hastelloy C 276 nickel alloy mesh is used as the anode, and the distance between the cathode and the anode is 0.5cm. 1000mL 1mol / L NaOH+15g sodium 2-chlorophenate+18.5g sodium 2,4-dichlorophenol+131.6g sodium 2,4,6-trichlorophenol+25.4g sodium 2,3,5,6-tetrachloro The aqueous solution of sodium phenate+28.9 grams of sodium pentachlorophenate is electrolyte. During the electrolysis process, the temperature is controlled at 20-25°C, and the current density is controlled at 10A / dm 2 , the electrolysis voltage is 2.8-3.3V, the pH of the catholyte is controlled at 13.5-14, and the cathode potential is -0.8--1.2V vs. Ag / AgCl (3.0M KCl). Stop the electrolysis after feeding 200AH of electricity. After the catholyte was transfer...

Embodiment 3

[0040] Example 3 Palladium-catalyzed electrochemical hydrogenation dechlorination of 2,4-dichlorophenate sodium, 2,4-dichlorophenoxy sodium acetate, 3,6-dichloropicolinate sodium, and dichloroacetate sodium mixture into phenol and phenoxyacetic acid , picolinic acid and acetic acid

[0041] In a diaphragmless electrolyzer, a palladium-modified expanded silver screen was used as the cathode (1g Pd / m 2 ), the Hastelloy C 276 nickel alloy mesh is used as the anode, and the distance between the cathode and the anode is 0.5cm. The aqueous solution of 1000mL 1mol / L NaOH+37g sodium 2,4-dichlorophenate+48.8g sodium 2,4-dichlorophenoxyacetate+43g sodium 3,6-dichloropicolinate+60.4g sodium dichloroacetate is electrolyte. During the electrolysis process, the temperature is controlled at 20-25°C, and the current density is controlled at 10A / dm 2 , the electrolysis voltage is 2.9-3.4V, the pH of the catholyte is controlled at 13.5-14, and the cathode potential is -0.8--1.2V vs. Ag / AgCl ...

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Abstract

The invention discloses an electrochemical method for the hydrodechlorination of a chlorinated organic pollutant. The method comprises: adding the chlorinated organic pollutant into an alkaline solution so as to obtain electrolytic reaction liquid; and carrying out electrolytic reaction in a non-diaphragm electrolytic cell using a conductive material modified by palladium as a cathode and a chemically inert conductive material as an anode so as to obtain a fully dechlorinated compound. The electrochemical method for the hydrodechlorination of the chlorinated organic pollutant, provided by the invention, utilizes the palladium for catalysis, simultaneously realizes high current efficiency, high current density and low electrolytic voltage and does not use a diaphragm. The electrochemical method for the hydrodechlorination of the chlorinated organic pollutant not only can greatly reduce the usage quantity of the palladium catalyst and reduce the volume of the electrolytic cell, but also can simplify the structure of the electrolytic cell, reduce the cost of the electrolytic cell and reduce electrolytic energy consumption.

Description

(1) Technical field [0001] The invention relates to an electrochemical hydrogenation dechlorination method for chlorinated organic pollutants or mixtures thereof, in particular to a method for electrochemically hydrogenating chlorine substituents on chlorinated organic pollutants with weakly acidic groups such as carboxyl and hydroxyl groups. (2) Background technology [0002] Chlorinated organic pollutants are an important class of refractory organic compounds, which are very harmful to organisms and the environment. Most chlorinated organic compounds are artificially synthesized products with very stable chemical properties. The presence of chlorine atoms on their molecules is toxic to microorganisms, so they degrade slowly in nature and have a long period of harm. The toxicity of chlorinated organic compounds is mainly due to the introduction of chlorine atoms, and chlorine atoms have high electronegativity. With the increase of chlorine substituents, the difficulty of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B3/25
Inventor 徐颖华王一想马红星马淳安
Owner SHANGHAI LINKCHEM TECH CO LTD
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