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Composite catalyst for selective chlorination of aromatic compounds and application thereof

A composite catalyst, aromatic compound technology, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, chemical/physical process, etc., to speed up the reaction process, reduce cost and reaction efficiency, and improve selection sexual effect

Inactive Publication Date: 2014-03-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] None of the above methods can well meet the requirements of actual production, so a new method must be invented, which not only improves the high selectivity of p-dichlorobenzene but also can be applied to actual production

Method used

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Examples

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preparation example Construction

[0034] There are many preparation methods for the metal complex of the present invention, including solid-phase method and liquid-phase method, etc., which are well known in the art. In the present invention, the metal complex used is prepared by the solid-phase method. (Li Guangmei et al. Preparation and application of acetylacetonate salt. "Chemical Intermediates". 2009.8.01-04)

[0035] Take iron acetylacetonate as an example: put 36mmol (1.44g) of solid alkali sodium hydroxide into a mortar, add 80mmol (16g) of acetylacetone, grind for 2-3 minutes, then add 20mmol (3.25g) of ferric chloride, add Grind the iron salt to a thin paste, continue to grind to a solid powder, and grind for 15 minutes; after the reaction is complete, soak it in distilled water, filter it with suction, wash it with 60mL distilled water three times, and dry it at room temperature. Its melting point is measured to be 179-182°C. The same method can be used to synthesize aluminum acetylacetonate, which...

Embodiment 1

[0038] Add 1500g of chlorobenzene into a 5mL reaction bottle, start stirring, heat to a constant temperature of 50°C, add 18g of iron acetylacetonate, and blow in a certain amount of chlorine gas at the same time. The whole device reacts under normal pressure. Samples were taken every 0.5 h, and the progress of the reaction and the content of each substance in the detection reaction system were monitored by a gas chromatograph, and the reaction was stopped when trichloro products appeared.

Embodiment 2

[0040] Add 1500g of chlorobenzene into a 5L reaction flask, start stirring, heat to a constant temperature of 50°C, add 18g of iron acetylacetonate and 0.4g of mercaptan, and simultaneously blow in a certain amount of chlorine gas. The whole device reacts under normal pressure. Samples were taken every 0.5 h, and the progress of the reaction and the content of each substance in the detection reaction system were monitored by a gas chromatograph, and the reaction was stopped when trichloro products appeared.

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Abstract

The invention provides a composite catalyst for the selective chlorination of aromatic compounds, which comprises a metal complex and an organic sulfide. The invention also provides application of the composite catalyst as a reaction catalyst for the selective chlorination of aromatic compounds, which is specifically implemented by carrying out selective chlorination on aromatic compounds by taking chlorine gas as a chlorine source under the catalytic action of the composite catalyst. According to the composite catalyst, para-selectivity is good, meta-position products are few, the composite catalyst is suitable for being practically used, and wide in application range, can be applied to the chlorination of all aromatic compounds and derivatives thereof, including di-chlorination and poly-chlorination, as well as the chlorination of monocyclic or polycyclic hydrocarbons and derivatives thereof.

Description

technical field [0001] The invention belongs to the field of organic synthesis, in particular to a composite catalyst for the selective chlorination of aromatic compounds, and also relates to the application of the composite catalyst. Background technique [0002] P-dichlorobenzene is an important organic chemical product. As early as the early 19th century, p-dichlorobenzene was produced on a large scale abroad; while in my country, the research and production of p-dichlorobenzene started relatively late until the early 1880s The directional synthesis and refining technology of p-dichlorobenzene has only been greatly developed in my country. [0003] The dichlorination products of benzene or chlorobenzene include p-dichlorobenzene (PDCB), ortho-dichlorobenzene (ODCB) and m-dichlorobenzene (MDCB). Since the application value of p-dichlorobenzene is much higher than that of o-dichlorobenzene and m-dichlorobenzene, it is required to increase the high selectivity of p-dichlorob...

Claims

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Application Information

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IPC IPC(8): B01J31/22C07C25/10C07C17/12C07C25/08
Inventor 葛裕华范淼任开路
Owner SOUTHEAST UNIV
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