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Method for efficiently degrading chlorinated phenolic compound

A technology for chlorinated phenols and compounds, which is applied in the field of efficient degradation of chlorinated phenolic compounds, to achieve the effects of rapid and effective hydrodechlorination, rapid degradation, less catalyst consumption and high catalytic activity

Inactive Publication Date: 2013-02-13
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although there are many reports on the heterogeneous catalytic hydrogenation method using noble metals as catalysts for the degradation of organochlorinated phenols in the environment, there are many reports on the use of bimetallic catalysts (one of which is a noble metal and the other is a common metal) catalysts, using heterogeneous The method of catalytic hydrodechlorination to degrade organic chlorinated phenols has not been reported in the literature and patents

Method used

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  • Method for efficiently degrading chlorinated phenolic compound
  • Method for efficiently degrading chlorinated phenolic compound
  • Method for efficiently degrading chlorinated phenolic compound

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Preparation of Hydrodechlorination Catalyst

[0028] A certain amount of palladium chloride, ferric chloride, cobalt chloride and nickel chloride are dissolved in concentrated hydrochloric acid, diluted with water, and then impregnated into Activated carbon, placed at room temperature for 24h, then washed with ammonia and deionized water until free of Cl - So far, after being finally dried, it is reduced with sodium borohydride, and then sealed and stored to obtain palladium / carbon, palladium-iron / carbon, palladium-cobalt / carbon, palladium-nickel / carbon catalysts with different contents. The catalysts with different contents are listed in Table 1.

[0029] According to the preparation process of the catalyst described above, except that the carrier is different, the rest of the process is the same, and the bimetallic supported catalysts with different supports can be prepared, and the prepared catalysts are listed in Table 1.

[0030] Table 1 Catalysts with different ...

Embodiment 2

[0032] The hydrodechlorination of different chlorinated phenolic compounds of embodiment 2

[0033] Weigh 25 mg of the catalyst prepared in Example 1, add it to a 100 ml three-necked flask, add 80 ml of an aqueous solution of 4-CP (wherein the concentrations of DCP, TCP and PCP are 1000 ppm) with a concentration of 5000 ppm, and stir the reactant with a magnetic stirrer. Adsorb for 15min; then pass N 2 , do this three times, and then pass H 2 , H 2 The flow rate is controlled within the range of 10-30ml / min, and the alkali used is sodium hydroxide. In order to ensure that the second-step oxidation reaction can be carried out relatively quickly, the ratio of the amount of alkali to the amount of chlorine in the reaction substrate is 1.1 : 1, the reaction temperature is controlled at 30°C, and the reaction pressure is normal pressure. According to the different dechlorination rates of different chlorinated phenolic compounds, the reaction time is also different. The specific d...

Embodiment 3

[0037] The influence of embodiment 3 different bases on 4-CP hydrodechlorination

[0038] Take by weighing the 1%Pd 3.0%NiPd-Ni / C catalyst that 25mg embodiment 1 prepares, join in the there-necked flask of 100ml, add the 4-CP aqueous solution 80ml that concentration is 5000ppm, make reactant be stirred under magnetic stirrer Adsorb for 15min; then pass N 2 , do this three times, and then pass H 2 , H 2 The flow rate is controlled within the range of 10-30ml / min, and the alkali used can be sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, triethylamine, sodium bicarbonate, pyridine, but in order to ensure that the second oxidation reaction can Relatively fast, the ratio of the amount of alkali to the amount of chlorine in the reaction substrate is 1.1:1, the reaction temperature is controlled at 30°C, the reaction pressure is normal pressure, and the reaction is carried out for 60 minutes. The specific dechlorination results are shown in Table 3 . ...

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Abstract

The invention relates to the heterogeneous catalysis degradation technology and specifically relates to a method for efficiently degrading a chlorinated phenolic compound. The method includes that the chlorinated phenolic compound utilizes a catalyst with a VIII group of metal serving as an active component, hydrogen is used as a hydrogen source, and a hydrodechlorination reaction is performed under the existence of alkali so as to fully degrade the chlorinated phenolic compound. The method for efficiently degrading the chlorinated phenolic compound has the advantages that the degrading method is high in efficiency, the reaction condition is mild, the reactants are thoroughly degraded, the operation is easy to control, and the cost is low.

Description

technical field [0001] The invention relates to heterogeneous catalytic degradation technology, in particular to a method for efficiently degrading chlorinated phenolic compounds. Background technique [0002] Halogenated phenolic compounds are known as a major killer of the environment in today's society, among which chlorinated phenolic compounds are represented, which are commonly used intermediates in pesticides, are produced in large quantities and are widely used in daily life , and chlorinated phenolic compounds can exist in the environment for a long time and are not easy to degrade, and accumulate in the body, which can easily lead to cancer, deformity and even gene mutation. s damage. At present, many methods for degrading halogenated phenolic compounds have been introduced. Commonly used methods include biodegradation, adsorption, extraction, and liquid membrane separation. However, these methods more or less have certain problems, such as the biodegradation met...

Claims

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Application Information

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IPC IPC(8): A62D3/34B01J23/89B01J23/44A62D101/28
Inventor 夏传海孙秀敏马宣宣
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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