Combined degradation method for processing high concentration halogenated phenol compounds

A technology for halogenated phenols and compounds is applied in the field of joint degradation of high-concentration halogenated phenolic compounds to achieve the effects of reducing environmental pollution, improving stability and reducing grain size

Active Publication Date: 2014-04-16
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although both heterogeneous catalytic hydrogenation and catalytic oxidation methods have been used to degrade organohalogenated phenols in the environment, there are no litera

Method used

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  • Combined degradation method for processing high concentration halogenated phenol compounds
  • Combined degradation method for processing high concentration halogenated phenol compounds
  • Combined degradation method for processing high concentration halogenated phenol compounds

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0022] Example 1 Preparation of Hydrodehalogenation Catalyst

[0023] A certain amount of palladium chloride is dissolved in concentrated hydrochloric acid, diluted with water and then immersed in activated carbon, and then evaporated to dryness under constant stirring. The obtained solid is crushed into powder, reduced by hydrogen gas, and finally sealed and stored to obtain palladium / carbon catalysts with different contents. Palladium / carbon catalysts with different contents are listed in Table 1. Then, supported catalysts with different carriers and different active ingredients can be prepared. The prepared catalysts are listed in Table 1.

[0024] Table 1 Different carriers and catalysts with different active components

[0025]

Example Embodiment

[0026] Example 2 Preparation of Raney Ni catalyst

[0027] In a 4L beaker, dissolve 380g of sodium hydroxide in 1.5L of distilled water, stir, and cool to 10°C on an ice bath. Under stirring, add 300g of nickel-aluminum alloy into the lye in small batches, and the speed of addition should be controlled so that the temperature of the solution does not exceed 25°C (on an ice bath). When all the additions are complete (about 2 hours), stop stirring, remove the beaker from the ice bath, and allow the reaction solution to rise to room temperature. When hydrogen generation is slow, you can slowly heat it on a boiling water bath (avoid heating too fast to prevent excessive bubbles and overflow of the reaction liquid), until the bubble generation slows down again (about 8-12 hours, at which time the volume of the solution) It should be maintained basically constant by adding distilled water). Then let the nickel powder settle, and pour off the supernatant. Add distilled water to the o...

Example Embodiment

[0028] Example 3 Hydrodehalogenation of different halogenated phenolic compounds

[0029] Weigh 25mg of the Pd / C catalyst prepared in Example 1 and add it to a 100ml three-necked flask, add 80ml of 4-CP aqueous solution with a concentration of 5000ppm, and make the reactant be adsorbed for 15min under stirring with a magnetic stirrer; then pass N 2 , Do this three times, 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 proceed relatively quickly, the molar ratio of the amount of alkali to the amount of the reaction substrate is 1.1:1. The reaction temperature was controlled at 30°C, and the reaction pressure was normal pressure. The specific dechlorination results are shown in Table 2.

[0030] Table 2 Hydrodehalogenation of different halogenated phenol compounds

[0031]

[0032] Remarks: CP means monochlorophenol, BP means monobromophenol, DCP mean...

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Abstract

The invention relates to a method for processing halogenated phenol compounds, and concretely relates to a combined degradation method for processing high concentration halogenated phenol compounds. The method comprises the following steps: 1, carrying out a hydrogenation dehalogenation reaction in the presence of an alkali through adopting a supported noble metal catalyst supporting a VIII family metal and treating hydrogen as a hydrogen source; and 2, degrading the hydrogenate-dechlorinated product obtained in step 1 through treating Fe<2+> or pillared clay as a catalyst and H2O2 as an oxidant. The degradation method of the invention has the advantages of high efficiency, mild reaction condition, thorough reactant degradation, and easy control and low cost of the operation.

Description

technical field [0001] The invention relates to a treatment method for halogenated phenolic compounds, in particular to a combined degradation method for treating high-concentration halogenated phenolic compounds. Background technique [0002] Halogenated phenolic compounds, especially chlorinated phenolic compounds, are industrially produced in large quantities as intermediates for the synthesis of organochlorine pesticides, and are also widely used as insecticides and fungicides. Such compounds are difficult to degrade in nature , easy to accumulate in organisms, and has the "three effects" of carcinogenicity, teratogenicity, and mutagenicity. The discharge of wastewater containing halogenated phenolic compounds into the environment can cause serious pollution to the environment, and cause serious harm to animals, plants, and humans. harm. [0003] At present, there are many methods for treating chlorophenol wastewater, and the commonly used methods are biodegradation met...

Claims

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Application Information

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IPC IPC(8): A62D3/30A62D3/38A62D101/28A62D101/22
Inventor 夏传海马宣宣刘苏静周世伟薛朋李智专周昊
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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