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A chlorinated aromatic compound (r 1 -x m ) dechlorination method

An aromatic compound, r1-xm technology, applied in the field of dechlorination of chlorinated aromatic compounds, can solve problems such as complex process and achieve the effect of safe catalytic efficiency

Active Publication Date: 2021-01-26
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method is complex in process, and the reaction capacity is in the millimolar level, and it is only suitable for the dechlorination of chlorinated phenols with certain solubility in water solvents.

Method used

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  • A chlorinated aromatic compound (r <sub>1</sub> -x <sub>m</sub> ) dechlorination method
  • A chlorinated aromatic compound (r <sub>1</sub> -x <sub>m</sub> ) dechlorination method
  • A chlorinated aromatic compound (r <sub>1</sub> -x <sub>m</sub> ) dechlorination method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] According to the dechlorination method provided by the present invention, in a 500mL autoclave, add 100mL of methanol, 10g of 1,2,3-trichlorobenzene, 2.5g of 3% Pd / C catalyst, and 20mL of 30% NaOH solution. The aforementioned mixture was stirred evenly, hydrogenation reaction was carried out at 100° C., and time-tracking was carried out. Such as figure 1 As shown, the conversion rate of 1,2,3-trichlorobenzene reached 40% after 1 hour of reaction; after 5 hours of reaction, the conversion rate of 1,2,3-trichlorobenzene was 90%.

Embodiment 2-1～2-4

[0063] According to the dechlorination method provided by the present invention, the hydrodechlorination performance at different temperatures is evaluated. Take 10 g of 1,2,3-trichlorobenzene, 3 g of 3% Pd / C catalyst, and 30 mL of 30% NaOH solution, and react for the same time. The results are shown in the table below: As the temperature increased, the conversion rate of the substrate continued to increase.

[0064] Table 1, the hydrodechlorination performance of the dechlorination method provided by the present invention at different temperatures

[0065]

Embodiment 3

[0067] According to the dechlorination kit provided by the present invention, take 10 g of hexachlorobenzene as a substrate, 3 g of 3% Pd / C catalyst, 30 mL of 30% NaOH solution, and 100 mL of methanol solution, and react at 180° C. for 60 minutes. The product after the reaction was analyzed by gas chromatography, and the results were as follows: figure 2 As shown, the peaks 3a, 3b, 3c, 3d, and 3e from left to right in the figure represent methanol, benzene, chlorobenzene, o-dichlorobenzene, and hexachlorobenzene, respectively. The conversion rate of hexachlorobenzene is 99%, wherein the content of o-dichlorobenzene is 2%, the content of chlorobenzene is 2.54%, and the content of benzene is 94.46%.

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Abstract

The invention provides a dechlorination method of a chlorinated aromatic compound (R1-Xm), and the method comprises the following steps: taking the R1-Xm as a substrate, adding R2(OH)n, an alkaline substance with a pH value greater than 7 and a supported catalyst to form a mixture, stirring the mixture; and heating the mixture for hydrogenation reaction to prepare R1-Xm', wherein R1 is a substituted or unsubstituted aromatic group, X is chloride ion, m is a positive integer, R2 is an unsubstituted aliphatic hydrocarbon group, n is an integer, m' is less than the m, and the m' is an integer.

Description

technical field [0001] The present invention relates to a kind of chlorinated aromatic compound (R 1 -X m ) dechlorination method, especially about a kind of chlorinated aromatic compound (R 1 -X m ) dechlorination method. Background technique [0002] The chemical properties of polychlorobenzene compounds and their derivatives are stable, and they are easy to accumulate in organisms. Once it enters the environment, it will pose a long-term threat to human beings and the ecological environment. It has been listed as one of the pollutants that are prioritized for global environmental control. However, polychlorobenzene by-products, including trichlorobenzene and tetrachlorobenzene, are unavoidably generated in current industrial production. The annual output of polychlorobenzene by-products is more than 10,000 tons, which not only pollutes the environment but also takes up space, coupled with high processing costs, it becomes a great burden in industrial production. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/23C07C25/08C07C25/06C07C1/26C07C15/04C07C209/74C07C211/46C07C211/52C07C37/00C07C39/04
CPCC07C1/26C07C17/23C07C37/00C07C209/74C07C25/08C07C25/06C07C15/04C07C211/46C07C211/52C07C39/04
Inventor 郑南峰荆文彤吴康宁刘圣杰陈洁
Owner XIAMEN UNIV
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