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A method for preparing cyclohexane by dechlorination and hydrogenation of chlorinated aromatic hydrocarbons

A technology for preparing chlorinated aromatic hydrocarbons and hydrogen, which is applied in chemical instruments and methods, hydrocarbon production from halogen-containing organic compounds, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of easy loss of catalysts and high reaction pressure. , can not be recycled, etc., to achieve the effect of high catalyst activity and selectivity, mild reaction conditions, and high catalyst activity

Active Publication Date: 2016-05-18
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reaction temperature of this method is low, there are disadvantages such as high reaction pressure, easy loss of catalyst and cannot be recycled.

Method used

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  • A method for preparing cyclohexane by dechlorination and hydrogenation of chlorinated aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 100 grams of the palladium / nickel supported bimetallic catalyst (with coconut shell charcoal as a carrier, wherein the mass percentage content of nickel is 5%, and the mass percentage content of palladium is 5%) after reduction activation is packed in a fixed-bed reactor, Program temperature rise and space velocity 20h -1 Introduce hydrogen to the reaction temperature of 200°C, then increase the hydrogen space velocity to 40h -1 , after heating and vaporizing chlorobenzene at a space velocity of 5h -1 The speed is passed into a fixed-bed reactor for reaction, and the gas product content is analyzed by gas chromatography after the product is absorbed by water, and the results are shown in Table 1.

Embodiment 2

[0021] 100 grams of the palladium / nickel supported bimetallic catalyst (with coconut shell charcoal as a carrier, wherein the mass percentage content of nickel is 10%, and the mass percentage content of palladium is 0.5%) after reduction activation is packed in a fixed-bed reactor, Program temperature rise and space velocity 20h -1 Introduce hydrogen to the reaction temperature of 300°C, then reduce the hydrogen space velocity to 7h -1 , after heating and vaporizing hexachlorobenzene at a space velocity of 0.4h -1 The speed is passed into a fixed-bed reactor for reaction, and the gas product content is analyzed by gas chromatography after the product is absorbed by water, and the results are shown in Table 1.

Embodiment 3

[0023] 100 grams of the palladium / nickel supported bimetallic catalyst (with coconut shell charcoal as a carrier, wherein the mass percentage content of nickel is 15%, and the mass percentage content of palladium is 1%) after reduction activation is packed in a fixed-bed reactor, Program temperature rise and space velocity 20h -1 Introduce hydrogen to the reaction temperature of 150°C, then reduce the hydrogen space velocity to 5h -1 , and then the mixture of 1,2,3,4-tetrachlorobenzene and 1,2,3,5-tetrachlorobenzene is heated and vaporized at a space velocity of 0.4h -1 The speed is passed into a fixed-bed reactor for reaction, and the gas product content is analyzed by gas chromatography after the product is absorbed by water, and the results are shown in Table 1.

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Abstract

The invention relates to a method of preparing cyclohexane by dechlorinating and hydrogenating chlorinated aromatic hydrocarbon. Under the action of a catalyst, hydrogen and the chlorinated aromatic hydrocarbon are subjected to dechlorination and hydrogenation to prepare the cyclohexane by one step. The reaction temperature is 150-350 DEG C. The space velocity of the hydrogen is 5-50 h<-1>. The space velocity of the chlorinated aromatic hydrocarbon is 0.4-8 h<-1>. The method is advantaged by simple process, mild reaction conditions, high catalyst activity, high selectivity, long service lifetime, and the like.

Description

technical field [0001] The invention relates to a method for preparing cyclohexane, in particular to a method for preparing cyclohexane by dechlorination and hydrogenation of chlorinated aromatic hydrocarbons. Background technique [0002] Chlorinated aromatic hydrocarbons are important chemical raw materials, organic synthesis intermediates and organic solvents, and are widely used in chemical, pharmaceutical, pesticide, dye, electronics and other industries. However, the widespread use of chlorinated aromatic compounds also poses a growing threat to human health and the environment. For example, many organochlorine pesticides (lindane, aldrin, dieldrin, etc.) The wide application, existence and enrichment in the food chain are more harmful to the human body. The first batch of 12 controlled chemical substances in 3 categories announced by the Stockholm Convention on Persistent Organic Pollutants (PoPs) issued by the United Nations Environment Program All are chlorinated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C13/18C07C1/26B01J23/89
Inventor 吴奕周强
Owner JUHUA GROUP TECH CENT