Method for high-efficiency degradation of persistent organic chloridized pollutant

A persistent and pollutant technology, which is applied in the field of degradation of organic chlorinated pollutants, can solve unreported problems and achieve the effects of reducing environmental pollution, improving stability and saving dosage

Active Publication Date: 2012-06-27
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

[0009] Although heterogeneous catalytic hydrogenation methods have been used for the dehalogenation of organic halogenated pollutants in the environment, there are no literatures and patents on the hydrodehalogenation of organic halogenated pollutants in organic-aqueous two-phase

Method used

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  • Method for high-efficiency degradation of persistent organic chloridized pollutant
  • Method for high-efficiency degradation of persistent organic chloridized pollutant
  • Method for high-efficiency degradation of persistent organic chloridized pollutant

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Embodiment 1

[0023] The preparation of embodiment 1 catalyst

[0024] Dissolve a certain amount of palladium chloride in concentrated hydrochloric acid, dilute it with water and impregnate it into activated carbon, then evaporate to dryness under constant stirring. The obtained solid is ground into powder, then reduced by hydrogen gas, and finally sealed and stored to obtain palladium / carbon catalysts with different contents. Catalysts with different supports and different active components were prepared as described above (see Table 1).

[0025] Table 1 Catalysts with different supports and different active components

[0026]

Embodiment 2

[0027]The preparation of embodiment 2Raney Ni catalyst

[0028] 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 to the lye in small quantities in batches, and the speed of adding should be controlled so that the temperature of the solution does not exceed 25°C (on an ice bath). When all the addition was complete (about 2 hours), the stirring was stopped, the beaker was taken off from the ice bath, and the reaction solution was allowed to rise to room temperature. When the hydrogen generation is slow, it can be heated slowly on a boiling water bath (avoid heating up too fast, in case there are too many bubbles, and the reaction solution overflows), until the generation of the bubbles slows down again (about 8-12 hours, the volume of the solution at this time It should be kept basically constant by adding distilled water). Then stand still, allow the nickel po...

Embodiment 3

[0029] Hydrodechlorination of polychlorinated biphenyls in different organic phases of embodiment 3

[0030] Take by weighing the 5.0%Pd / C catalyst that 25mg embodiment 1 prepares respectively, join in the there-necked flask of 100ml, add the PCBs solution 30ml that concentration is 2.5g / L in each three-necked flask, the above-mentioned gained catalyst is respectively in different organic React in phase, organic phase solvent is benzene, toluene, xylene, normal hexane, cyclohexane, isooctane, normal heptane or cyclopentane, and aqueous phase volume is 30ml, and added alkali is sodium hydroxide, and the The addition phase transfer agent was tetraethylammonium chloride, the reaction temperature was controlled at 40°C, the reaction pressure was normal pressure, and the reaction was stirred with a magnetic stirrer and hydrogen was passed through. The specific results are shown in Table 2. (Because the transformer oil is a polychlorinated biphenyl mixture, the amount of various sub...

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Abstract

The invention relates to a degrading method for an organic chloridized pollutant, in particular to a hydrogenized dehalogenating method for the high-efficiency degradation of a persistent organic halogenated pollutant. Particularly, a reaction system of the method is an organic-water two-phase solvent system and is used for the hydrogenized dechlorination of a persistent organic chloridized pollutant at normal temperature and normal pressure, transition metal is adopted as a catalyst, and this class of catalyst comprises active components and a vector. The active component is one or more in Pd, Rh, Ru, Pt, Ni, Fe, Co and Ir. The active components account for 0.5 to 5.0 percent of the mass fraction of the catalyst. The reaction pressure is the normal pressure, and the reaction temperature is controlled at 30 to 55 DEG C. According to the method, the preparation is simple, and special equipment is not needed. The dehalogenating reaction condition is mild, the operation is easy to control, the use quantity of the catalyst is little, and the removing rate of halogen is high.

Description

technical field [0001] The invention relates to a method for degrading organic chlorinated pollutants, in particular to a hydrodehalogenation method for efficiently degrading persistent organic halogenated pollutants. Background technique [0002] Polychlorinated biphenyls and brominated flame retardants are low water-soluble multi-persistent organic halogenated pollutants, and their structures are respectively: [0003] [0004] Wherein X=Cl, Br, m=1~5, n=1~5 [0005] [0006] where X=Cl, Br, Y=O, CH 2 CH 2 , m=1~5, n=1~5 [0007] This kind of polychlorinated biphenyl compounds and brominated flame retardants have very good heat resistance and electrical insulation performance, stable physical and chemical properties, insoluble in water, easily soluble in organic solvents and fats, and are often used as heat carriers for heating or cooling , Capacitors and insulating materials inside transformers are also often used as coatings and solvents, and have a wide range ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/37C07C1/26C07C15/14C07C15/18C07C43/275C07C41/24A62D101/22A62D101/28
Inventor 夏传海马宣宣刘苏静薛朋李智专周昊王建华
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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