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Halogenated arene degraded by aluminum oxide

A technology of aluminum oxide and halogenated aromatics, applied in organic decomposition, chemical instruments and methods, etc., can solve problems such as long-distance global migration, and achieve the effect of low reaction temperature

Inactive Publication Date: 2007-11-28
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Long-distance global migration is possible

Method used

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  • Halogenated arene degraded by aluminum oxide
  • Halogenated arene degraded by aluminum oxide
  • Halogenated arene degraded by aluminum oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The aluminum oxide amorphous powder is ground, roasted, sieved and dried. Place 2mg of hexachlorobenzene and 200mg of alumina amorphous powder at 1.09cm 3 Mix well in an airtight container and react at 300°C for 1 hour. The residue after the reaction was extracted with n-hexane, and the organic phase was extracted with pure water to wash away the water-soluble impurities. The obtained n-hexane solution was detected by GC / MS to analyze the organic products after the dechlorination reaction, indicating that hexachlorobenzene had been eliminated. Completely dechlorinated. After the remaining solid matter was dried, the inorganic compounds were analyzed by X-ray diffraction, which indicated that the residue was Al 2 o 3 , AlCl 3 Wait.

Embodiment 2

[0023] The aluminum oxide amorphous powder is ground, roasted, sieved and dried. Place 2mg of hexachlorobenzene and 200mg of alumina amorphous powder at 1.09cm 3 Mix well in a closed container and react at 300°C. The reaction times are 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes. The residue after the reaction was extracted with n-hexane, and the organic phase was extracted with pure water to wash away the water-soluble impurities, and the obtained n-hexane solution was detected by GC / MS to analyze the organic products after the dechlorination reaction. After analysis and calculation, the dechlorination efficiencies at 20 minutes, 30 minutes, 40 minutes, 50 minutes and 60 minutes are respectively 95.9%, 98.6%, 99.3%, 99.5% and 99.9%. The relationship between dechlorination efficiency and reaction time is shown in Figure 1.

Embodiment 3

[0025] The aluminum oxide amorphous powder is ground, roasted, sieved and dried. Place 2mg of hexachlorobenzene and 200mg of alumina amorphous powder at 1.09cm 3Mix well in a closed container and react at 200°C, 230°C, 270°C, and 300°C for one hour respectively. The residue after the reaction is extracted with n-hexane, and the organic phase is extracted with pure water to wash away the water-soluble Impurities, the obtained n-hexane solution was detected by GC / MS, and the organic products after the dechlorination reaction were analyzed. After analysis and calculation, the dechlorination efficiencies at 200°C, 230°C, 270°C, and 300°C were respectively 35.8%, 56.9%, 93.2%, 99.9%. The relationship between dechlorination efficiency and reaction temperature is shown in Figure 2.

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Abstract

The present invention provides method of degrading halogenated arene with Al2O3 as dehalogenating agent. Hexachlorobenzene and dehalogenating agent Al2O3 in the amount of 5-100 times of hexachlorobenzene weight are mixed inside some container and reacted at 200-500 deg.c for 0.5-1.5 hr, so as to degrade hexachlorobenzene. The present invention has low cost, simple apparatus, short reaction period, low power consumption and other advantages, and can degrade halogenated arene in relatively low temperature. The method of the present invention is also suitable for degrading other halogenated arene, such as polychlorinated biphenyl, polybrominated biphenyl, BHC and DDT.

Description

technical field [0001] The invention relates to a method for dehalogenating and degrading halogenated aromatic hydrocarbons. Background technique [0002] Halogenated aromatic compounds refer to a class of compounds in which the hydrogen atoms on the aromatic ring are replaced by halogen atoms such as Cl and Br. It is widely used as a raw material for various chemical productions, and is also produced as a by-product in many chemical production processes. . [0003] Among the many halogenated aromatic compounds, some compounds are not only highly toxic, but also difficult to degrade in the environment, posing a threat to the ecological environment and human health. Of greatest concern are the potential hazards of persistent organic pollutants that are difficult to degrade. Among them, HCH, DDT, dioxins, polychlorinated biphenyls, and hexachlorobenzene are of particular concern. Due to their long-term persistence, bioaccumulation, semi-volatility and high toxicity, these s...

Claims

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Application Information

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IPC IPC(8): C07B35/06
Inventor 郑明辉张利飞刘文彬张兵马小东刘文霞
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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